Dr. Andrew T. Wittenberg

Curriculum Vitae

Geophysical Fluid Dynamics Laboratory
US DOC/NOAA/OAR/GFDL
Princeton University Forrestal Campus
201 Forrestal Road, Princeton, NJ 08540-6649
Tel: +1-609-987-5064
Fax: +1-609-987-5063
Andrew.Wittenberg "at" noaa.gov
www.gfdl.noaa.gov/~atw
researchgate.net/profile/Andrew_Wittenberg
scholar.google.com/citations?user=n3qkCSMAAAAJ
orcid.org/0000-0003-1680-8963
researcherid.com/rid/G-9619-2013

Research Interests

Education

Ph.D. in Atmospheric and Oceanic Sciences, Princeton University, June 2002
Dissertation: ENSO Response To Altered Climates
Advisor: Professor George Philander
 
M.S. in Atmospheric and Oceanic Sciences, Princeton University, October 1997
Thesis: Dynamical implications of prescribing part of a coupled system
Advisor: Professor Jeffrey L. Anderson
 
Bachelor of Science in Physics, summa cum laude, Oregon State University, June 1995
Minor in Computer Science

Professional Experience

2012 - present Physical Scientist, Climate Variations and Predictability Group, GFDL/NOAA
2004 - 2012 Physical Scientist, Climate Change, Variability and Prediction Group, GFDL/NOAA
2002 - 2004 Postdoctoral Research Associate, Atmospheric and Oceanic Sciences, Princeton University
1997 - 2002 Research Assistant with Professor George Philander, Atmospheric and Oceanic Sciences, Princeton University
1998 - 2000 Teaching Assistant, Atmospheric and Oceanic Sciences, Princeton University
1995 - 1997 Research Assistant with Professor Jeffrey L. Anderson, GFDL/NOAA
1994 - 1995 Research Assistant with Professor William Hartmann, Physics, Michigan State University
1993 Research Assistant with Professor John Gardner, Physics, Oregon State University

Awards and Honors

2014 Silver Medal for Meritorious Federal Service, U.S. Department of Commerce
Awarded to the principal developers of the GFDL ESM2M and ESM2G Earth System Models.
"For development and application of NOAA's first comprehensive Earth System Models that couple the carbon cycle and climate to project future changes."
2013 Gold Medal for Distinguished Achievement in the Federal Service, U.S. Department of Commerce
Awarded to the principal developers of the GFDL CM3 global climate model.

"For original research and world scientific leadership in the modeling of atmospheric greenhouse gases and aerosols, and their interactions with climate."
2011 Outstanding Scientific Publication Award, NOAA/GFDL
For "Are historical records sufficient to constrain ENSO simulations?"
by A. T. Wittenberg, Journal of Climate, 2009.
2009 Editors' Award, American Meteorological Society
Reviewer of the year for Journal of Climate, 2008.
"For dependably thorough, scholarly, and constructive reviews."
2008 Outstanding Scientific Publication Award, NOAA
For "System Design and Evaluation of Coupled Ensemble Data Assimilation for Global Oceanic Climate Studies"
by Zhang, Harrison, Rosati, & Wittenberg, Monthly Weather Review, 2007.
2007 Outstanding Scientific Publication Award, NOAA
For "Weakening of Tropical Pacific Atmospheric Circulation Due to Anthropogenic Forcing"
by Vecchi, Soden, Wittenberg, Held, Leetmaa, & Harrison, Nature, 2006.
2002 - 2004 AOS Postdoctoral Fellowship, Princeton University
1998 - 2001 NASA Earth System Science Fellowship
1996 - 1998 National Science Foundation Graduate Research Fellowship
1994 - present Phi Kappa Phi National Honor Society
1994 - 1995 Sigma Pi Sigma National Physics Honor Society
1994 - 1995 Mortar Board National Honor Society
1994 - 1995 Phi Kappa Phi Scholarship
1994 Rhodes Scholarship Finalist
1993, 1994, 1995 Paul Copson Memorial Scholar, Oregon State University
1992, 1993, 1994 Waldo-Cummings Outstanding Student Award
1992, 1993, 1994 Drucilla Smith University Scholastic Award
1991 - 1995 Presidential Scholar, Oregon State University
1991 - 1995 National Merit Scholar

Proposal Awards

9/1/2014 - 8/31/2017 Understanding tropical Pacific biases in climate simulations and initialized predictions (NOAA/CPO)
Lead PI, with Y. Xue, G. Vecchi, T. Delworth, and A. Kumar
9/15/2014 - 9/14/2017 Understanding ENSO diversity and changes in climate models and observations (DOE #DE-SC0005110)
Co-PI, with F.-F. Jin (lead) and A. Timmermann
9/15/2010 - 9/14/2013 Assessing ENSO regime changes in a changing climate (DOE #103155)
Co-PI, with F.-F. Jin (lead) and A. Timmermann

Professional Activities

2013 - present Co-chair, ENSO in a Changing Climate (CLIVAR Research Focus)
2012 - present US CLIVAR Working Group on ENSO Diversity
2008 - present CLIVAR Pacific Panel Working Group on ENSO Metrics
2014 Convener, ENSO: Dynamics, Predictability and Modelling, Session NP2.1, EGU General Assembly, Vienna, Austria.
2013 Convener, ENSO: Dynamics, Predictability and Modelling, Session NP2.1, EGU General Assembly, Vienna, Austria.
2012 - 2013 Contributing Author, IPCC Fifth Assessment Report (AR5), Working Group I, Chapter 14
2012 - 2013 Expert Reviewer, IPCC Fifth Assessment Report (AR5), Working Group I, Chapters 2, 5, 9, and 14
2012 Convener, Five Controversies in Climate Science, A symposium honoring the contributions of S. George Philander.  Princeton University, Princeton, NJ, 6-7 September 2012.
2012 Convener, ENSO: Dynamics, Predictability and Modelling, Session NP2.1, EGU General Assembly, Vienna, Austria.
2010 - 2012 Co-chair, GFDL Formal Seminar Series (Fall 2010 - Summer 2012).
2011 Convener, ENSO: Dynamics, Predictability and Modelling, Session NP2.1/CL2.19, EGU General Assembly, Vienna, Austria.
2006 - 2011 Co-chair, GFDL Coupled Model Development Team (CMDT)
2002 - 2011 GFDL Coupled Model Development Team (CMDT)
2002 - 2011 GFDL Global Atmospheric Model Development Team (GAMDT)
2002 - 2011 GFDL Ocean Model Development Team (OMDT)
2010 Convener, New Strategies for Evaluating ENSO Processes in Climate Models, CLIVAR Workshop, Paris, France, 17-19 November 2010.
2010 Convener, ENSO: Dynamics, Predictability and Modelling, Session NP2.1/CL2.19, EGU General Assembly, Vienna, Austria.
2003 - 2009 US CLIVAR Working Group on Correcting Tropical Biases
2008 Convener, ENSO and Global Change: Past, Present, and Future, Session A11, AGU Fall Meeting, San Francisco.
2005 Review Panelist, NOAA Climate Variability and Predictability proposal review panel
2002 - 2005 Ocean Data Assimilation for Seasonal-to-Interannual Prediction (ODASI), a NOAA/CDEP consortium.

Journal Referee Proposal Referee Professional Societies
2002 - present American Geophysical Union

Advising

Graduate Student Dissertation Committees Graduate Student Interns Undergraduates High School Students

Teaching

Guest Lecturer Laboratory Instructor

Publications

Google Scholar ResearchGate ResearcherID ORCID Microsoft Academic Search
  1. Capotondi, A., A. Wittenberg, M. Newman, E. Di Lorenzo, J.-Y. Yu, et al., 2014: Understanding ENSO diversity.  Bull. Amer. Meteor. Soc., in press.  See also the one-page summary.
  2. Knutson, T. R., F. Zeng, and A. T. Wittenberg, 2014b: Multimodel assessment of extreme annual-mean warm anomalies during 2013 over regions of Australia and the western tropical Pacific.  Section 9 of: "Explaining extreme events of 2013 from a climate perspective."  Bull. Amer. Meteor. Soc., 95 (9), in press.
  3. Knutson, T. R., F. Zeng, and A. T. Wittenberg, 2014a: Seasonal and annual mean precipitation extremes occurring during 2013: A U.S. focused analysis.  Section 4 of: "Explaining extreme events of 2013 from a climate perspective."  Bull. Amer. Meteor. Soc., 95 (9), in press.
  4. Vecchi, G. A., T. Delworth, R. Gudgel, S. Kapnick, A. Rosati, A. T. Wittenberg, F. Zeng, et al., 2014: On the seasonal forecasting of regional tropical cyclone activity.  J. Climate, published online.  doi: 10.1175/JCLI-D-14-00158.1.
  5. Graham, F. S., J. N. Brown, C. Langlais, S. J. Marsland, A. T. Wittenberg, and N. J. Holbrook, 2014: Effectiveness of the Bjerknes stability index in representing ocean dynamics.  Climate Dyn., published online.  doi: 10.1007/s00382-014-2062-3.
  6. Msadek, R., T. L. Delworth, A. Rosati, W. Anderson, G. Vecchi, Y.-S. Chang, K. Dixon, R. G. Gudgel, W. Stern, A. Wittenberg, X. Yang, F. Zeng, R. Zhang, and S. Zhang, 2014: Predicting a decadal shift in North Atlantic climate variability using the GFDL forecast system.  J. Climate, 27, 6472-6496.  doi: 10.1175/JCLI-D-13-00476.1.
  7. Wittenberg, A. T., A. Rosati, T. L. Delworth, G. A. Vecchi, and F. Zeng, 2014: ENSO modulation: Is it decadally predictable?  J. Climate, 27, 2667-2681.  doi: 10.1175/JCLI-D-13-00577.1(Featured in Nature "News & Views".)  See also the one-page summary.
  8. Vecchi, G. A., R. Msadek, W. Anderson, Y.-S. Chang, T. Delworth, K. Dixon, R. Gudgel, A. Rosati, W. Stern, G. Villarini, A. T. Wittenberg, X. Yang, F. Zeng, R. Zhang, and S. Zhang, 2014: Reply to comments on "Multiyear predictions of North Atlantic hurricane frequency: Promise and limitations."  J. Climate, 27, 490-492.  doi: 10.1175/JCLI-D-13-00381.1.
  9. Knutson, T. R., F. Zeng, A. Wittenberg, H.-S. Kim, J. Sirutis, M. Bender, M. Zhao, and R. Tuleya, 2014: Recent research at GFDL on surface temperature trends and simulations of tropical cyclone activity in the Indian Ocean region.  Pages 50-62 (Chapter 5) of Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change, U.C. Mohanty et al. (eds.), Springer, ISBN 978-94-007-7720-0.  doi: 10.1007/978-94-007-7720-0_5.
  10. Karamperidou, C., M. A. Cane, U. Lall, and A. T. Wittenberg, 2014: Intrinsic modulation of ENSO predictability viewed through a local Lyapunov lens.  Climate Dyn., 42, 253-270.  doi: 10.1007/s00382-013-1759-z.
  11. Choi, K.-Y., G. A. Vecchi, and A. T. Wittenberg, 2013: ENSO transition, duration and amplitude asymmetries: Role of the nonlinear wind stress coupling in a conceptual model.   J. Climate, 26, 9462-9476.  doi: 10.1175/JCLI-D-13-00045.1.
  12. McGregor, S., A. Timmermann, M. H. England, O. Elison Timm, and A. T. Wittenberg, 2013: Inferred changes in El Niño-Southern Oscillation variance over the past six centuries.  Clim. Past, 9, 2269-2284.  doi: 10.5194/cp-9-2269-2013.
  13. Knutson, T. R., F. Zeng, and A. T. Wittenberg, 2013b: Multimodel assessment of regional surface temperature trends: CMIP3 and CMIP5 twentieth-century simulations.  J. Climate, 26, 8709-8743.  doi: 10.1175/JCLI-D-12-00567.1. View the GFDL Research Highlight.
  14. Knutson, T. R., F. Zeng, and A. T. Wittenberg, 2013a: The extreme March-May 2012 warm anomaly over the eastern United States: Global context and multimodel trend analysis.   Section 5 of: "Explaining extreme events of 2012 from a climate perspective.Bull. Amer. Meteor. Soc., 94 (9), S13-S17. doi: 10.1175/BAMS-D-13-00085.1(The full report received a 2013 "Top Global Thinkers" award from Foreign Policy Magazine.)  View the GFDL Research Highlight.
  15. Ogata, T., S.-P. Xie, A. Wittenberg, and D.-Z. Sun, 2013: Interdecadal amplitude modulation of El Niño/Southern Oscillation and its impacts on tropical Pacific decadal variability.  J. Climate, 26, 7280-7297.  doi: 10.1175/JCLI-D-12-00415.1.
  16. *Capotondi, A., and A. Wittenberg, 2013: ENSO diversity in climate models.  U.S. CLIVAR Variations, 11, 10-14.  Full newsletter is here.
  17. *U.S. CLIVAR Project Office, 2013: U.S. CLIVAR ENSO Diversity Workshop Report.  Report 2013-1, U.S. CLIVAR Project Office, Washington, DC, 20006, 20pp.
  18. Vecchi, G. A., R. Msadek, W. Anderson, Y.-S. Chang, T. Delworth, K. Dixon, R. Gudgel, A. Rosati, W. Stern, G. Villarini, A. T. Wittenberg, X. Yang, F. Zeng, R. Zhang, and S. Zhang, 2013: Multiyear predictions of North Atlantic hurricane frequency: Promise and limitations.  J. Climate, 26, 5337-5357.  doi: 10.1175/JCLI-D-12-00464.1.
  19. Emile-Geay, J., K. Cobb, M. Mann, and A. T. Wittenberg, 2013b: Estimating central equatorial Pacific SST variability over the past millennium.  Part II: Reconstructions and implications.  J. Climate, 26, 2329-2352.  doi: 10.1175/JCLI-D-11-00511.1.  [CLICK HERE FOR RECONSTRUCTION DATA.]
  20. Emile-Geay, J., K. Cobb, M. Mann, and A. T. Wittenberg, 2013a: Estimating central equatorial Pacific SST variability over the past millennium.  Part I: Methodology and validation.  J. Climate, 26, 2302-2328.  doi: 10.1175/JCLI-D-11-00510.1.
  21. Yang, X., A. Rosati, S. Zhang, T. L. Delworth, R. G. Gudgel, R. Zhang, G. Vecchi, W. Anderson, Y.-S. Chang, T. DelSole, K. Dixon, R. Msadek, W. F. Stern, A. Wittenberg, and F. Zeng, 2013: A predictable AMO-like pattern in GFDL's fully-coupled ensemble initialization and decadal forecasting system.  J. Climate, 26, 650-661.  doi: 10.1175/JCLI-D-12-00231.1.
  22. Dunne, J. P., J. G. John, E. Shevliakova, R. J. Stouffer, J. P. Krasting, S. L. Malyshev, P. C. D. Milly, L. T. Sentman, A. J. Adcroft, W. Cooke, K. A. Dunne, S. M. Griffies, R. W. Hallberg, M. J. Harrison, H. Levy, A. T. Wittenberg, P. J. Phillips, and N. Zadeh, 2013: GFDL's ESM2 global coupled climate-carbon Earth System Models, Part II: Carbon system formulation and baseline simulation characteristics.  J. Climate, 26, 2247-2267.  doi: 10.1175/JCLI-D-12-00150.1.
  23. Dunne, J. P., J. G. John, A. J. Adcroft, S. M. Griffies, R. W. Hallberg, E. Shevliakova, R. J. Stouffer, W. Cooke, K. A. Dunne, M. J. Harrison, J. P. Krasting, S. L. Malyshev, P. C. D. Milly, P. J. Phillips, L. T. Sentman, B. L. Samuels, M. J. Spelman, M. Winton, A. T. Wittenberg, and N. Zadeh, 2012: GFDL's ESM2 global coupled climate-carbon Earth System Models, Part I: Physical formulation and baseline simulation characteristics.  J. Climate, 25, 6646-6665.  doi: 10.1175/JCLI-D-11-00560.1.
  24. Watanabe, M., J.-S. Kug, F.-F. Jin, M. Collins, M. Ohba, and A. T. Wittenberg, 2012: Uncertainty in the ENSO amplitude change from the past to the future.  Geophys. Res. Lett., 39, L20703.  doi: 10.1029/2012GL053305.  See also the supplement.
  25. Watanabe, M., and A. T. Wittenberg, 2012: A method for disentangling El Niño-mean state interaction.  Geophys. Res. Lett., 39, L14702.  doi: 10.1029/2012GL052013.
  26. DiNezio, P. N., B. P. Kirtman, A. C. Clement, S.-K. Lee, G. A. Vecchi, and A. Wittenberg, 2012: Mean climate controls on the simulated response of ENSO to increasing greenhouse gases.  J. Climate, 25, 7399-7420.  doi: 10.1175/JCLI-D-11-00494.1.
  27. Delworth, T. L., A. Rosati, W. Anderson, A. J. Adcroft, V. Balaji, R. Benson, K. Dixon, S. M. Griffies, H.-C. Lee, R. C. Pacanowski, G. A. Vecchi, A. T. Wittenberg, F. Zeng, and R. Zhang, 2012: Simulated climate and climate change in the GFDL CM2.5 high-resolution coupled climate model.  J. Climate, 25, 2755-2781.  doi: 10.1175/JCLI-D-11-00316.1.
  28. *Guilyardi, E., H. Bellenger, M. Collins, S. Ferrett, W. Cai, and A. Wittenberg, 2012: A first look at ENSO in CMIP5.  CLIVAR Exchanges, 17, 29-32.  ISSN: 1026-0471.
  29. Guilyardi, E., W. Cai, M. Collins, A. Fedorov, F.-F. Jin, A. Kumar, D.-Z. Sun, and A. Wittenberg, 2012: New strategies for evaluating ENSO processes in climate models.  Bull. Amer. Met. Soc., 93, 235-238.  doi: 10.1175/BAM S-D-11-00106.1.
  30. Richter, I., S.-P. Xie, A. T. Wittenberg, and Y. Masumoto, 2012: Tropical Atlantic biases and their relation to surface wind stress and terrestrial precipitation.  Climate Dyn., 38, 985-1001.  doi: 10.1007/s00382-011-1038-9.
  31. Galbraith, E. D., E. Y. Kwon, A. Gnanadesikan, K. B. Rodgers, S. M. Griffies, D. Bianchi, J. L. Sarmiento, J. P. Dunne, J. Simeon, R. D. Slater, A. T. Wittenberg, and I. M. Held, 2011: Climate variability and radiocarbon in the CM2Mc Earth System Model.   J. Climate, 24, 4230-4254.  doi: 10.1175/2011JCLI3919.1.
  32. Griffies, S. M., et al., 2011: GFDL's CM3 coupled climate model: Characteristics of the ocean and sea ice simulations.  J. Climate, 24, 3520-3544.  doi: 10.1175/2011JCLI3964.1.
  33. Donner, L. J., et al., 2011: The dynamical core, physical parameterizations, and basic simulation characteristics of the atmospheric component AM3 of the GFDL global coupled model CM3J. Climate, 24, 3484-3519.  doi: 10.1175/2011JCLI3955.1.  View the GFDL Research Highlight.
  34. Chen, C.-K., C. Wang, K.-L. Ma, and A. Wittenberg, 2011: Static correlation visualization for large time-varying volume dataProceedings of the IEEE Pacific Visualization Symposium, Hong Kong, China, March 2011, 27-34.  doi: 10.1109/PACIFICVIS.2011.5742369.
  35. Collins, M., S.-I. An, W. Cai, A. Ganachaud, E. Guilyardi, F.-F. Jin, M. Jochum, M. Lengaigne, S. Power, A. Timmermann, G. Vecchi, and A. Wittenberg, 2010: The impact of global warming on the tropical Pacific and El Niño.  Nature Geoscience, 3, 391-397. doi: 10.1038/ngeo868.
  36. Vecchi, G. A., and A. T. Wittenberg, 2010: El Niño and our future climate: Where do we stand?   Wiley Interdisciplinary Reviews: Climate Change, 1, 260-270.  doi: 10.1002/wcc.33.
  37. Kug, J.-S., J. Choi, S.-I. An, F.-F. Jin, and A. T. Wittenberg, 2010: Warm pool and cold tongue El Niño events as simulated by the GFDL CM2.1 coupled GCM.  J. Climate, 23, 1226-1239.  doi: 10.1175/2009JCLI3293.1.
  38. Xie, S.-P., C. Deser, G. A. Vecchi, J. Ma, H. Teng, and A. T. Wittenberg, 2010: Global warming pattern formation: Sea surface temperature and rainfall.  J. Climate, 23, 966-986.  doi: 10.1175/2009JCLI3329.1[Read a commentary in Nature Geoscience, doi:10.1038/ngeo728.]
  39. Stenchikov, G, T. L. Delworth, V. Ramaswamy, R. J. Stouffer, A. Wittenberg, and F. Zeng, 2009: Volcanic signals in oceans.  J. Geophys. Res., 114, D16104.  doi: 10.1029/2008JD011673.
  40. Wittenberg, A. T., 2009: Are historical records sufficient to constrain ENSO simulations?  Geophys. Res. Lett., 36, L12702.  doi: 10.1029/2009GL038710(GFDL Outstanding Publication Award, 2011.)
  41. Anderson, W., A. Gnanadesikan, and A. Wittenberg, 2009: Regional impacts of ocean color on tropical Pacific variability.  Ocean Sci., 5, 313-327.  doi: 10.5194/os-5-313-2009.
  42. Guilyardi, E., A. Wittenberg, A. Fedorov, M. Collins, C. Wang, A. Capotondi, G. J. van Oldenborgh, and T. Stockdale, 2009: Understanding El Niño in ocean-atmosphere general circulation models: Progress and challenges.  Bull. Amer. Meteor. Soc., 90, 325-340.  doi: 10.1175/2008BAMS2387.1.
  43. Sukharev, J., C. Wang, K.-L. Ma, and A. T. Wittenberg, 2009: Correlation study of time-varying multivariate climate data sets.   Proc. of IEEE VGTC Pacific Visualization Symposium 2009, Beijing, China, April 2009, pages 161-168.  doi: 10.1109/PACIFICVIS.2009.4906852Video (AVI, 22MB).
  44. Zavala-Garay, J., C. Zhang, A. M. Moore, A. T. Wittenberg, M. J. Harrison, A. Rosati, J. Vialard, and R. Kleeman, 2008: Sensitivity of hybrid ENSO models to unresolved atmospheric variability.  J. Climate, 21, 3704-3721.  doi: 10.1175/2007JCLI1188.1.
  45. Kim, D., J.-S. Kug, I.-S. Kang, F.-F. Jin, and A. T. Wittenberg, 2008: Tropical Pacific impacts of convective momentum transport in the SNU coupled GCM.  Climate Dyn., 31, 213-226.  doi: 10.1007/s00382-007-0348-4.
  46. *Gebbie, G., I. Eisenman, A. Wittenberg, and E. Tziperman, 2007: Could ocean-modulated wind bursts lead to better El Niño forecasts?  Bull. Amer. Meteor. Soc. (Nowcast), 88 (9), 1356-1357.
  47. Gebbie, G., I. Eisenman, A. Wittenberg, and E. Tziperman, 2007: Modulation of westerly wind bursts by sea surface temperature: A semistochastic feedback for ENSO.  J. Atmos. Sci., 64, 3281-3295. doi: 10.1175/JAS4029.1.
  48. Zhang, S., M. J. Harrison, A. Rosati, and A. Wittenberg, 2007: System design and evaluation of coupled ensemble data assimilation for global oceanic climate studies.  Mon. Wea. Rev., 135, 3541-3564.  doi: 10.1175/MWR3466.1(NOAA Outstanding Publication Award, 2008.)
  49. Sun, C., M. M. Rienecker, A. Rosati, M. Harrison, A. Wittenberg, C. L. Keppenne, J. P. Jacob, and R. M. Kovach, 2007: Comparison and sensitivity of ODASI ocean analyses in the tropical Pacific.  Mon. Wea. Rev., 135, 2242-2264.  doi: 10.1175/MWR3405.1.
  50. Vecchi, G. A., B. J. Soden, A. T. Wittenberg, I. M. Held, A. Leetmaa, and M. J. Harrison, 2006: Weakening of tropical Pacific atmospheric circulation due to anthropogenic forcing.  Nature, 441, 73-76.  doi: 10.1038/nature04744.  See the full text and the supplement.   (NOAA Outstanding Publication Award, 2007.)
  51. Capotondi, A., A. Wittenberg, and S. Masina, 2006: Spatial and temporal structure of tropical Pacific interannual variability in 20th century coupled simulations.  Ocean Modelling, 15, 274-298.  doi: 10.1016/j.ocemod.2006.02.004.
  52. Wittenberg, A. T., A. Rosati, N.-C. Lau, and J. J. Ploshay, 2006: GFDL's CM2 global coupled climate models, Part III: Tropical Pacific climate and ENSO.  J. Climate, 19, 698-722.  doi: 10.1175/JCLI3631.1.
  53. Gnanadesikan, A., et al., 2006: GFDL's CM2 global coupled climate models, Part II: The baseline ocean simulation.  J. Climate, 19, 675-697.  doi: 10.1175/JCLI3630.1.
  54. Delworth, T. L., et al., 2006: GFDL's CM2 global coupled climate models, Part I: Formulation and simulation characteristics.  J. Climate, 19, 643-674.  doi: 10.1175/JCLI3629.1.
  55. Vecchi, G. A., A. T. Wittenberg, and A. Rosati, 2006: Reassessing the role of stochastic forcing in the 1997-8 El Niño.  Geophys. Res. Lett., 33, L01706.  doi: 10.1029/2005GL024738.
  56. Zhang, S., M. J. Harrison, A. T. Wittenberg, A. Rosati, J. L. Anderson, and V. Balaji, 2005: Initialization of an ENSO forecast system using a parallelized ensemble filter.   Mon. Wea. Rev., 133, 3176-3201. doi: 10.1175/MWR3024.1
  57. The GFDL Global Atmospheric Model Development Team, 2004: The new GFDL global atmosphere and land model AM2/LM2: Evaluation with prescribed SST simulations.  J. Climate, 17, 4641-4673.  doi: 10.1175/JCLI-3223.1.
  58. Wittenberg, A. T., 2004: Extended wind stress analyses for ENSO.  J. Climate, 17, 2526-2540.  doi: 10.1175/1520-0442(2004)017%3C2526:EWSAFE%3E2.0.CO;2 .
  59. Zhang, S., J. L. Anderson, A. Rosati, M. Harrison, S. P. Khare, and A. T. Wittenberg, 2004: Multiple time level adjustment for data assimilation. Tellus A, 56, 2-15.  doi: 10.1111/j.1600-0870.2004.00040.x.
  60. Fedorov, A. V. , S. L. Harper, S. G. Philander, B. Winter, and A. Wittenberg, 2003: How predictable is El Niño?  Bull. Amer. Meteor. Soc., 84, 911-919.  doi: 10.1175/BAMS-84-7-911.
  61. *Wittenberg, A. T., 2002: ENSO response to altered climates.  Ph.D. thesis, Princeton University. 475pp.  Click here for individual chapters.
  62. Wittenberg, A. T., and J. L. Anderson, 1998: Dynamical implications of prescribing part of a coupled system: Results from a low-order model.  Nonlin. Proc. Geophys., 5, 167-179.  doi: 10.5194/npg-5-167-1998.
  63. Hartmann, W. M., and A. Wittenberg, 1996: On the externalization of sound images.  J. Acoust. Soc. Am., 99, 3678-3688.  doi: 10.1121/1.414965.

Works Submitted

  1. Delworth, T. L., F. Zeng, A. Rosati, G. Vecchi, and A. Wittenberg, 2014: A link between the hiatus in global warming and North American drought.  Subm. to J. Climate, September 2014.
  2. Lee, S.-K., P. N. DiNezio, E.-S. Chung, S.-W. Yeh, A. Wittenberg, and C. Wang, 2014: Spring persistence, transition and resurgence of El Niño.  Subm. to Geophys. Res. Lett., September 2014.
  3. Krishnamurthy, L., G. Vecchi, R. Msadek, A. Wittenberg, T. Delworth, and F. Zeng, 2014: The seasonality of the Great Plains Low-Level Jet and ENSO relationship.  Subm. to J. Climate, August 2014.
  4. Yang, X., G. Vecchi, R. G. Gudgel, T. L. Delworth, S. Zhang, A. Rosati, L. Jia, W. F. Stern, A. T. Wittenberg, S. Kapnick, R. Msadek, S. D. Underwood, F. Zeng, W. Anderson, and V. Balaji, 2014: Seasonal predictability of extratropical storm tracks in GFDL's high-resolution climate prediction model.  Subm. to J. Climate, July 2014.
  5. Jia, L., X. Yang, G. A. Vecchi, R. G. Gudgel, T. L. Delworth, A. Rosati, B. Stern, A. Wittenberg, et al., 2014: Improved seasonal prediction of temperature and precipitation over land in a high-resolution GFDL climate model.  In revision for J. Climate, July 2014.
  6. Griffies, S. M., M. Winton, W. G. Anderson, R. Benson, T. L. Delworth, C. O. Dufour, J. P. Dunne, P. Goddard, A. K. Morrison, A. Rosati, A. T. Wittenberg, J. Yin, and R. Zhang, 2014: Impacts on ocean heat from transient mesoscale eddies in a hierarchy of climate models.  Revised for J. Climate, September 2014.

Talks

  1. A. T. Wittenberg, 2014: Predictions and the NMME.  Overview for Dr. Richard Spinrad (NOAA Chief Scientist), NOAA/GFDL, Princeton, NJ, 27 August 2014.
  2. A. T. Wittenberg, 2014: ENSO predictability and dynamics.  GFDL External Review, NOAA/GFDL, Princeton, NJ, 21 May 2014.
  3. Chen, C., M. Cane., and A. Wittenberg, 2013: Predictability of El Niño flavors in GFDL coupled GCM simulations.  NOAA/GFDL, Princeton, NJ, 28 August 2013.
  4. Wittenberg, A. T., 2013: Regional climate, extremes, and impacts.  GFDL Science Symposium, NOAA/GFDL, Princeton, NJ, 20 May 2013.
  5. Wittenberg, A. T., 2013: Assessing ENSO risks for the coming decades.  NOAA/GFDL, Princeton, NJ, 20 March 2013.
  6. Wittenberg, A. T., J.-S. Kug, J. Choi, S.-I. An, and F.-F. Jin, 2013: ENSO diversity in the GFDL CM2.1 coupled GCM.  U.S. CLIVAR ENSO Diversity Workshop, Boulder, CO, 6 February 2013.
  7. Wittenberg, A. T., 2012: Variation in ENSO teleconnections.  AGU Fall Meeting, San Francisco, CA, 7 December 2012.
  8. Wittenberg, A. T., 2012: Tropical climate change and ENSO.  Princeton University Carbon Mitigation Initiative, including the chief Scientist of BP, Professor Ellen Williams.  NOAA/GFDL, Princeton, NJ, 18 September 2012.
  9. Wittenberg, A. T., 2012: ENSO diversity in the GFDL CM2.1 coupled GCM.  US CLIVAR Working Group on ENSO Diversity.  Webinar broadcast from NOAA/GFDL, Princeton, NJ, 16 May 2012.
  10. Wittenberg, A. T., 2012: Tropical climate variability & change in the GFDL coupled GCMs.  Workshop on Decadal-to-Centennial Tropical Pacific Climate Variability: Perspectives from Proxies and Multi-Century Model Simulations.  Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, 2 February 2012.
  11. Wittenberg, A. T., 2011: Tropical climate change and ENSO.  GFDL Climate Modeling and Research Symposium, NOAA/GFDL, Princeton, NJ, 17 October 2011.
  12. Wittenberg, A. T., 2011: GFDL's Climate Change, Variability and Prediction Group.  GFDL New User Training, NOAA/GFDL, Princeton, NJ, 5 October 2011.
  13. Wittenberg, A. T., 2011: Whither ENSO?  Assessing ENSO risks for the coming decades.
  14. Wittenberg, A. T., 2010: Model fidelity and ENSO change: Signal versus noise.  New strategies for evaluating ENSO processes in climate models, CLIVAR workshop, Paris, France, 17 November 2010.  (Alternative PDF format here.)
  15. Wittenberg, A. T., 2010: Tropical climate, variability, and change in the GFDL global coupled GCMs.  Coral Vulnerability Workshop, Princeton University, Princeton, NJ, 30 August 2010.
  16. Wittenberg, A. T., 2010: Predictability of extreme ENSO epochs in the CM2.1 global coupled GCM.  15th Annual Ocean Sciences Meeting, Portland, OR, 26 February 2010.
  17. Wittenberg, A. T., T. Rosati, S. Zhang, et al., 2009: Seasonal to decadal predictability.  Roundtable on Applying Models of Global Climate Change to Natural Resources Management, NOAA/GFDL, Princeton, NJ, 17 August 2009.
  18. Wittenberg, A. T., 2009: Climate change and ENSO.  GFDL External Review, NOAA/GFDL, Princeton, NJ, 1 July 2009.
  19. Wittenberg, A. T., 2009: CM3: Tropical climate and ENSO.  GFDL-NCAR Atmospheric GCM Meeting, NOAA/GFDL, Princeton, NJ, 27 April 2009.
  20. Wittenberg, A. T., W. Anderson, A. Gnanadesikan, A. Capotondi, and G. Vecchi, 2009: Understanding & simulating El Niño: Lessons from the GFDL coupled GCMs.
  21. Wittenberg, A. T., 2009: CO2-induced changes in tropical climate, as simulated by the GFDL coupled GCMs.  International ENSO Workshop, Greenhouse 2009, Perth, Australia, 26 March 2009. See also page 31 of the workshop report.
  22. Wittenberg, A. T., 2008: Understanding ENSO modulation in the GFDL CM2.1 coupled GCM.  AGU Fall Meeting, San Francisco, CA, 15 December 2008.
  23. Wittenberg, A. T., 2008: Natural and forced modulation of ENSO in the GFDL CM2.1 coupled GCM.  Department of Atmospheric & Oceanic Science, University of Maryland, College Park, MD, 2 October 2008.
  24. Wittenberg, A. T., 2008: Natural modulation of ENSO in the GFDL CM2.1 coupled GCM.
  25. Wittenberg, A. T., K. Eckerle, G. Vecchi, S. Song, and A. Rosati, 2008: Indonesian Throughflow transports, variability, and change in the GFDL coupled GCMs.  INSTANT Workshop, Lamont-Doherty Earth Observatory, Palisades, NY, 29 May 2008.
  26. Wittenberg, A. T., and M. Winton, 2008: Coupled climate modeling at GFDL.  NOAA Climate Working Group, Climate Research and Modeling (CRM) Program Review, Hyatt Regency, Princeton, NJ, 25 March 2008.
  27. Wittenberg, A. T., 2006: ENSO dynamics and predictability in the GFDL coupled models.  Workshop on ENSO Dynamics and Predictability, Seoul National University, Seoul, South Korea, 12 September 2006. Also in OpenOffice.
  28. Wittenberg, A. T., and A. Rosati, 2006: What controls the period and amplitude of ENSO?  11th Annual CCSM Workshop, Breckenridge, CO, 20 June 2006.
  29. Wittenberg, A. T., G. A. Vecchi, and A. Rosati, 2006: Reassessing the role of stochastic forcing in the 1997-8 El Niño.  AGU Joint Assembly, Baltimore, MD, 25 May 2006.
  30. Vecchi, G. A., B. Soden, I. Held, A. Wittenberg, A. Leetmaa, and M. Harrison, 2006: Weakening of the Pacific Walker Circulation since the mid-19th Century.  AGU Joint Assembly, Baltimore, MD, 26 May 2006.
  31. Vecchi, G., Q. Song, A. Wittenberg, and M. Harrison, 2006: Coupled Indian Ocean intraseasonal variability.  AGU Joint Assembly, Baltimore, MD, 25 May 2006.
  32. Wittenberg, A. T., 2006: Simulated CO2-induced changes in tropical climate and variability.  NOAA/GFDL, Princeton, NJ, 22 March 2006.
  33. Eisenman, I., E. Tziperman, J. Gebbie, L. Yu, and A. Wittenberg, 2005: Feedbacks between El Nino and the "noise" that drives it: Modulation of westerly wind bursts by large-scale SST.  Boston University, 17 October 2005.
  34. Wittenberg, A. T., 2005: Climate sensitivities of ENSO: Bridging theories, observations, and modeling.  First Alexander von Humboldt International Conference on The El Niño Phenomenon and Its Global Impact, Guayaquil, Ecuador, 20 May 2005. Also in OpenOffice and PowerPoint. The abstract is here.
  35. Gebbie, G., I. Eisenman, E. Tziperman, and A. Wittenberg, 2005: Westerly wind bursts: ENSO's tail rather than dog?  EGU General Assembly, Vienna, Austria, 28 April 2005. Also in OpenOffice and PowerPoint. The abstract is here.
  36. Wittenberg, A. T., 2005: On extended wind stress analyses for ENSO.   Stony Brook University, Stony Brook, New York, 2 February 2005. Also in PowerPoint.
  37. Wittenberg, A. T., G. Vecchi, T. Rosati, M. Harrison, I. Held, and T. Knutson, 2005: ENSO Modeling at GFDL.   Overview for Rick Rosen (Assistant Administrator, NOAA OAR) and Chet Koblinsky (NOAA/OAR Director for Climate), NOAA/GFDL, Princeton, NJ, 21 January 2005. Also in PowerPoint.
  38. Wittenberg, A. T., and G. A. Vecchi, 2004: Reassessing the role of stochastic forcing in ENSO events.
  39. Wittenberg, A. T., G. Vecchi, T. Rosati, M. Harrison, S. Zhang, I. Held, R. Gudgel, and the GFDL Model Development Teams, 2004: Simulation and prediction of El Niño at the Geophysical Fluid Dynamics Laboratory.   Oregon State University, Corvallis, OR, 11 November 2004.
  40. Rosati, A., M. Harrison, A. Wittenberg, and S. Zhang, 2005: NOAA/GFDL ocean data assimilation activities.  CLIVAR Workshop on Ocean Reanalysis, NCAR, Boulder, CO, 9 November 2004.
  41. Wittenberg, A. T., and A. Rosati, 2004: Tropical Pacific Climate & ENSO in the GFDL CM2/2.1 control simulations.  NOAA/GFDL, Princeton, NJ, 19 August 2004.  See also the CM2 handout and the CM2.1 handout.
  42. Galanti, E., M. Tippet, S. Zebiak, S DeWitt, A. T. Wittenberg, M. Harrison, T. Rosati, and M. Rienecker, 2004: On data assimilation and ENSO dynamical prediction.   International Research Institute for Climate Prediction, Palisades, NY, 30 June 2004.
  43. Wittenberg, A. T., and E. Galanti, 2004: Assessing the impact of stochastic forcing on ENSO events.  2004 Joint Assembly, Montreal, Canada, 19 May 2004.
  44. W. Stern, A. Rosati, R. Gudgel, M. Harrison, and A. T. Wittenberg, 2004: Subseasonal to interannual prediction sensitivities in the GFDL/FMS GCM.  84th AMS Annual Meeting, Seattle, WA, 13 January 2004.
  45. Wittenberg, A. T., T. Rosati, and I. Held, 2003: ENSO in the GFDL coupled model.  8th Annual CCSM Workshop, Breckenridge, CO, 24 June 2003.
  46. Wittenberg, A. T., and M. J. Harrison, 2003: A baseline statistical model for tropical Pacific wind stress anomalies.  Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, 17 February 2003.
  47. Wittenberg, A. T., 2002: ENSO response to altered climates. NOAA/GFDL, Princeton, NJ, 2 May 2002.
  48. Wittenberg, A. T., 2002: Understanding the sensitivity of ENSO to the tropical climatology.  International Research Institute for Climate Prediction, Palisades, NY, 11 January 2002.
  49. Wittenberg, A. T., 2000: The modulation of El Niño by climate change.  Department of Geoscience Annual Retreat, Killington, VT, January 2000.
  50. Wittenberg, A. T., 1999: The dynamics of El Niño.  Department of Geoscience Annual Retreat, Killington, VT, January 1999.
  51. Wittenberg, A. T., 1997: Dynamical implications of forcing a model with a prescribed boundary.  Atmospheric & Oceanic Sciences General Seminar, Princeton University, 17 October 1997.
  52. Wittenberg, A. T., 1996: Dynamics of tropical cyclones.  Workshop on Science for Tomorrow, Japan Association for Mathematical Sciences, Hokkaido, Japan, 27 July 1996.

Posters

  1. Wittenberg, A. T., G. A. Vecchi, T. L. Delworth, A. Rosati, and W. G Anderson, 2014: ENSO changes with increasing resolution in the GFDL models.   2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 13302. See also the ePoster
  2. McGregor, S., A. Timmermann, M. H. England, O. Elison Timm, and A. T. Wittenberg, 2014: Inferred changes in El Niño Southern Oscillation variance over the past six centuries.  2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 13255.
  3. Ogata, T., S.-P. Xie, A. Wittenberg, and D.-Z. Sun, 2014: Interdecadal amplitude modulation of El Niño/Southern Oscillation and its impacts on tropical Pacific decadal variability.  2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 13463.
  4. Graham, F. S., J. N. Brown, A. T. Wittenberg, N. J. Holbrook, and S. J. Marsland, 2014: Implications of coupled model biases for ENSO ocean dynamics and climate projections.  2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 15374.
  5. Chen, C., M. A. Cane, A. T. Wittenberg, D. Chen, and N. Henderson, 2014: Evolutionary characteristics and predictability of ENSO diversity.  2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 17869.
  6. Choi, K.-Y., G. A. Vecchi, and A. T. Wittenberg, 2014: Roles of wind and precipitation nonlinearities in ENSO asymmetries.  2014 Ocean Sciences Meeting, Honolulu, HI, 26 February 2014.  AbstractID: 14365.
  7. Chen, C., M. Cane, D. Chen, N. Henderson, and A. T. Wittenberg, 2013: Diagnosing the dynamics of ENSO flavors using linear inverse models.  19th Conference on Atmospheric and Oceanic Fluid Dynamics, Newport, RI, 17 June 2013.
  8. Wittenberg, A. T., 2013: Variation of ENSO teleconnections.  U.S. CLIVAR ENSO Diversity Workshop, Boulder, CO, 7 February 2013.
  9. Guilyardi, E., H. Bellenger, P. Braconnot, M. Collins, S. Ferett, J. Leloup, W. Cai, A. Wittenberg, S.-W. Yeh, and Y.-G. Ham, 2012: A first look at ENSO in CMIP5.   WCRP Workshop on CMIP5 Model Analysis, University of Hawaii, Honolulu, HI, 5-9 March 2012.
  10. Graham, F. S., J. N. Brown, A. Wittenberg, and N. J. Holbrook, 2012: Application of the ENSO unified oscillator theory to an ocean-only model.  Poster 15-05, AMOS 18th National Conference, University of New South Wales, Sydney, Australia, 1 February 2012.  Awarded the conference prize for best student poster.
  11. Wittenberg, A. T., 2011: Assessing ENSO risks for the coming decades.  WCRP Open Science Conference, Session C36, poster Th25A, Denver, CO, 27 October 2011.
  12. C. Karamperidou, M. Cane, A. T. Wittenberg, and U. Lall, 2011: ENSO's decadal dance viewed through a local Lyapunov lens.  WCRP Open Science Conference, Session C25, Denver, CO, 27 October 2011.
  13. Guilyardi, E., A. Wittenberg, and the ENSO Metrics Working Group of the CLIVAR Pacific Panel, 2010: ENSO and tropical Pacific metrics for CMIP5.
  14. Anderson, W., A. Gnanadesikan, and A. Wittenberg, 2008: The role of ocean color in the variability of the tropical Pacific.  NASA Carbon Cycle & Ecosystems Joint Science Workshop, Adelphi, MD, 28 April 2008.
  15. Wittenberg, A. T., 2007: Addressing tropical biases in GFDL's global coupled climate models.
  16. Wittenberg, A. T., G. A. Vecchi, and A. Rosati, 2006: Simulated CO2-induced changes in tropical climate and variability.
  17. Capotondi, A., A. T. Wittenberg, and S. Masina, 2006: Temporal structure of ENSO in 20th century climate simulations.  13th Ocean Sciences Meeting, Honolulu, HI, 21 February 2006.
  18. Wittenberg, A. T., A. Rosati, N.-C. Lau, and J. J. Ploshay, 2005: GFDL's CM2 global coupled climate models: Tropical Pacific climate and ENSO.  10th Annual CCSM Workshop, Breckenridge, CO, 21-23 June 2005.
  19. Wittenberg, A. T., and A. Rosati, 2004: Tropical Pacific climate & variability in the GFDL CM2 global coupled GCM.
  20. Wittenberg, A. T., and A. Rosati, 2004: Sensitivities of ENSO: Lessons from the GFDL CM2 global coupled GCM.
  21. Wittenberg, A. T., and S. G. H. Philander, 2004: The Pacific cold tongue and ENSO: Sensitivity to the meridional wind stress climatology.  12th Ocean Sciences Meeting, Portland, OR, 30 January 2004.
  22. Wittenberg, A. T., and M. J. Harrison, 2003: A baseline statistical model for tropical Pacific wind stress anomalies.  14th Conference on Atmospheric & Oceanic Fluid Dynamics, San Antonio, TX, 11 June 2003.
  23. Wittenberg, A. T., 2002: What is the wind stress over the tropical Pacific?  AGU Fall Meeting, San Francisco, CA, 10 December 2002.
  24. Wittenberg, A. T., 1999: Modulation of ENSO by changes in tropical climate.  Eighth Conference on Climate Variations, Denver, CO, 15 September 1999.

Other Activities

2000 - present Frequent contributor to Ferret software and its user's group
2004 - 2006 Board Member, GFDL Employees' Association
2000 TAO buoy operations, NOAA Research Vessel Ka'imimoana
1997 Summer School on Inverse Methods and Data Assimilation, OSU 
1996 Workshop on Science for Tomorrow, Hokkaido, Japan
1994 - 1995 President, Society of Physics Students, OSU
1994 - 1995 OSU Science Student Council (Physics Representative)
1993 - 1995 Software engineer and language tutor, English Language Institute, OSU 
1995 Mentor, OSU Children's Motor Fitness Clinic
1993 - 1994 President, McNary Residence Hall, OSU
1993 - 1995 President, McNary Jugglers, OSU
1993 Programmer, Microflect Company, Inc., Salem, Oregon (now Valmont Industries)
1992 - 1993 Physics and math tutor, OSU

Research keywords:

Personal Interests: parenting, cycling, running, hiking, skiing, genealogy, juggling, ballroom dancing

Last updated: 20 June 2014