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GFDL Events & Seminars

Poster Expos

Upcoming GFDL events & seminars

Events and seminars
  • January 28, 2015: Poster Expo
    Poster Expo (GFDL)
    Posters
    Time: 12:00 pm - 5:00 pm
    Location: Smagorinsky Seminar Room
  • February 4, 2015: Assessing Possible Anthropogenic Contributions to the Rainfall Extremes Associated with Typhoon Morakot (2009)
    Cheng-Ta Chen (National Taiwan Normal University )
    Assessing Possible Anthropogenic Contributions to the Rainfall Extremes Associated with Typhoon Morakot (2009)
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • February 5, 2015: Multi-decadal aerosol variations and their effects on solar radiation reaching the surface
    Mian Chin (NASA)
    will present an investigation on multi-decadal changes of atmospheric aerosols and their effects on surface radiation using a global chemistry transport model along with the near-term to long-term data records from remote sensing and ground-based measurements. I will show the variations and trends of aerosol trends in the past 3 decades (1980-2009) in different regions, link these changes to the change of sources and climate variability, and assess their effects on the multi-decadal change of solar radiation reaching the surface (known as “dimming” or “brightening”).
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • February 11, 2015: A dynamical framework for the origin of the diagonal South Pacific and South Atlantic convergence zones
    Adrian Matthews (University of East Anglia)
    The South Pacific Convergence Zone (SPCZ) and South Atlantic Convergence Zone (SACZ) are diagonal bands of precipitation that extend from the equator southeastward into the Southern Hemisphere over the western Pacific and Atlantic Oceans, respectively. With mean precipitation rates over 5 mm day-1, they are a major component of the tropical and global climate in austral summer. However, their basic formation mechanism is not fully understood. Here, a conceptual framework for the diagonal convergence zones is developed, based on calculations of the vorticity budget from reanalysis and Rossby wave theory. Wave trains propagate eastward along the Southern Hemisphere subtropical jet, with initially quasi-circular vorticity centres. In the zonally sheared environment on the equatorward flank of the jet, these vorticity centres become elongated and develop a northwest-southeast tilt. Ray tracing diagnostics in a non-divergent, barotropic Rossby wave framework then explain the observed equatorward propagation of these diagonal vorticity structures toward the westerly ducts over the equatorial Pacific and Atlantic. The baroclinic component of these circulations leads to destabilisation and ascent ahead of the cyclonic vorticity anomaly in the wave, triggering deep convection because of the high sea surface temperatures in this region. Latent heat release then forces additional ascent and strong upper-tropospheric divergence, with an associated anticyclonic vorticity tendency. A vorticity budget shows that this cancels out the advective cyclonic vorticity tendency in the wave train over the SPCZ, and dissipates the wave within a day. The mean SPCZ is consequently comprised of the sum of these pulses of diagonal bands of precipitation. Similar mechanisms also operate in the SACZ. However, the vorticity anomalies in the wave trains are stronger, and the precipitation and negative feedback from the divergence and anticyclonic vorticity tendency are weaker, resulting in continued propagation of the wave and a more diffuse diagonal convergence zone. Numerical model experiments are carried out to investigate the roles of the underlying SST field and the internal dynamics of the Rossby waves to the existence of the diagonal convergence zones.
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • February 18, 2015: TBA
    Liping Zhang (AOS)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • February 19, 2015: TBA
    Eli Tziperman (SEAS - Harvard)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • February 26, 2015: TBA
    Janet Sprintall (U of California - San Diego)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • March 4, 2015: TBA
    Jonas Nycander (Stockholm University)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • March 5, 2015: TBA
    Alberto Naveira-Garabat (U of Southampton, UK)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • March 11, 2015: TBA
    Dan Li (AOS)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • March 12, 2015: TBA
    Mat Collins (Exeter - United Kingdom)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • March 26, 2015: TBA
    Richard Moss (PNNL, Richland, WA)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • April 2, 2015: TBA
    Jeremey Fyke (Los Alamos Natl. Lab)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • April 9, 2015: TBA
    Joanie Kleypas (NCAR)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • April 16, 2015: TBA
    Robert Allen (UC - Riverside)
    TBA
    Time: 2:00 pm - 3:15 pm
    Location: Smagorinsky Seminar Room
  • April 23, 2015: TBA
    Tim Lenton (Exeter - UK)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • April 30, 2015: TBA
    Clara Deser (NCAR)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • May 6, 2015: TBA
    Pu Lin (AOS/GFDL)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • May 7, 2015: TBA
    Jean-Francois Lamarque (GFDL)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • May 13, 2015: TBA
    Tom Delworth and Liping Zhang (GFDL)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • May 14, 2015: TBA
    Zhou Wang (U of Illinois)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • May 21, 2015: TBA
    Steve Krueger (University of Utah)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • June 4, 2015: TBA
    Amy Clement (RSMAS - Miami)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • June 25, 2015: TBA
    Richard Rotunno (UCAR, Boulder, CO)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room

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