GFDL Events

Upcoming GFDL events & seminars

• May 22, 2013: Ensemble Forecasts Using the GFDL Hurricane Model
  Tim Marchok (GFDL)
  Ensemble Forecasts Using the GFDL Hurricane Model
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room
• May 23, 2013: Direct estimates of eddy mixing across the Antarctic Circumpolar Current
  Raffaele Ferrari (MIT)
  Direct estimates of eddy mixing across the Antarctic Circumpolar Current
  Time: 2:00 pm - 3:00 pm
  Location: Smagorinsky Seminar Room
• May 29, 2013: Skillful predictions of North Atlantic decadal variability in the GFDL forecast system
  Rym Msadek (GFDL)
  Skillful predictions of North Atlantic decadal variability in the GFDL forecast system
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room
• May 30, 2013: Lower Boundary Forcing related to Occurrence of Rain in the Tropical Western Pacificcal oceanic precipitation as related to lower boundary forcing
  Richard "Rit" Carbone (NCAR)
  Systematic errors associated with tropical oceanic rainfall have challenged the global modeling community for decades. Among these errors are tendencies toward a double ITCZ and the over-prediction of regional rainfall. Also related to systematic errors is low predictive skill associated with the Madden-Julian Oscillation (MJO). This seminar addresses three related topics: 1) the influence of SST gradients on the excitation of deep moist convection, as evidenced by the onset of rainfall; 2) common regimes of organized convection and propagating event lifecycles; 3) correlation of rainfall with lower boundary forcing at short-range and MJO frequencies, as well as with mesoscale SST structure over the four year period of record. This research is observations based together with application of established theory. We employ four-year timeseries of satellite estimated rainfall and daily SST. A strong statistical association is revealed between mesoscale SST gradients and the location of rainfall onset. Preferred locations for rainfall onset are in the mid-range of the background SST distribution. The warmest SST locations are not favored (i.e. neutral) and the coolest are disfavored. The lifecycles of especially long-lived rainfall events are characterized statistically. These events live longest and rain strongest in tropospheric shear > 10-3 s-1, and dissipate in environments with reduced shear and cooler SST. Events of three days duration produce disproportionately large rainfall compared to events of one-day duration, perhaps causally related to specific environmental differences. The timeseries of rain and SST have been filtered at both short-range weather and MJO scales. There are phase relationships at short-range, fully consistent with coupled ocean-atmosphere responses. For the MJO, it appears that an SST positive anomaly leads MJO rainfall, essentially irrespective of the MJO phase, whereas the -Laplacian of SST appears to lead MJO rainfall by ~15-20 days specifically at its most active phase (5) in the western Pacific.
  Time: 2:00 pm - 3:00 pm
  Location: Smagorinsky Seminar Room
• June 12, 2013: TBA
  Vaishali Naik (GFDL)
  TBA
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room
• June 13, 2013: TBA
  Art DeGaetano (Cornell University)
  TBA
  Time: 2:00 pm - 3:15 pm
  Location: Smagorinsky Seminar Room
• June 19, 2013: TBA
  Reza Khanbilvardi (City University of New York)
  TBA
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room
• June 20, 2013: TBA
  Gabriele Villarini (University of Iowa)
  TBA
  Time: 2:00 pm - 3:00 pm
  Location: Smagorinsky Seminar Room
• June 26, 2013: TBA
  William Rossow (City University of New York)
  TBA
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room
• June 27, 2013: TBA
  William Boos (Yale)
  TBA
  Time: 2:00 pm - 3:15 pm
  Location: Smagorinsky Seminar Room
• July 11, 2013: TBA
  Tiffany Shaw (Columbia University)
  TBA
  Time: 2:00 pm - 3:00 pm
  Location: Smagorinsky Seminar Room
• July 18, 2013: TBA
  Vernon Morris (Howard U.)
  TBA
  Time: 2:00 pm - 3:00 pm
  Location: Smagorinsky Seminar Room
• July 31, 2013: TBA
  Michael Herzog (Cambridge University, UK)
  TBA
  Time: 12:00 pm - 1:00 pm
  Location: Smagorinsky Seminar Room

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