GFDL - Geophysical Fluid Dynamics Laboratory

GFDL Events & Seminars

Upcoming GFDL events & seminars

Events and seminars

  • June 20, 2018: Ants Leetmaa Symposium
    Ants Leetmaa Symposium
    Ants Leetmaa Symposium will take place at Frick Auditorium in Taylor Hall. Registration Required at: https://www.gfdl.noaa.gov/leetmaa-symposium/
    Time: 8:00 am - 5:00 pm
    Location: Other (see event description)
  • June 21, 2018: Alleviating climate model systematic error in the tropical Atlantic sector by enhancing atmospheric resolution: implications for seasonal to interannual variability and predictability
    Formal Seminar - Mojib Latif (University of Kiel)
    The influence of atmosphere model resolution on tropical Atlantic sector mean climate and seasonal to interannual variability is investigated in the Kiel Climate Model (KCM). Biases typical for state-of-the-art climate models such as large errors in the sea surface temperature (SST) over the eastern tropical Atlantic can be strongly reduced by employing high atmosphere model resolution, horizontal and vertical, while keeping the ocean model resolution relatively coarse. At high atmospheric resolution, simulation of the mean three-dimensional atmospheric circulation over the tropical Atlantic and the adjacent continents is much enhanced, which in turn improves simulation of the tropical Atlantic Ocean circulation. Companion uncoupled simulations performed with the atmospheric component of the KCM, in which observed SST is specified, reveal that the errors in the atmospheric circulation originate in the atmosphere model. The enhanced mean state and seasonal cycle greatly improves simulation of tropical Atlantic interannual SST variability, its amplitude and seasonal phase locking. Further, the representation of the West African Monsoon and its relationship to the cold tongue development in the tropical Atlantic is much enhanced. We conclude that sufficiently high atmosphere model resolution is a prerequisite to reduce climate model biases in the tropical Atlantic sector.
    Time: 1:00 pm - 2:00 pm
    Location: Smagorinsky Seminar Room
  • June 27, 2018: SPEAR - The Next Generation Seasonal to Decadal Prediction System at GFDL
    Lunchtime Seminar - Tom Delworth
    Lunchtime Seminar - Tom Delworth
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • July 10, 2018: Modeling of Volcanic Climate Impacts: Diverse Simulated Responses to a Unified Radiative Forcing
    Informal Seminar - Prof. Georgiy Stenchikov (Gera) (King Abdullah University of Science and Technology, Thuwal, SA)
    I will first discuss how the models currently simulate the volcanic radiative forcing, both using the pre-calculated aerosol parameters and calculating an aerosol plume interactively, specifically focusing on aerosol-induced lower stratospheric heating and surface cooling. The models, which calculate an aerosol plume interactively, demonstrate a big spread in the aerosol lifetime, and both, models with prescribed and simulated volcanic aerosols, have problems to correctly reproduce the lower stratospheric heating that is essential, e.g., for correctly calculating Arctic Oscillation (AO) responses to volcanic eruptions. In the second part of the talk, I will give an overview of our joint with GFDL studies of the volcanic impact on ENSO aiming at explaining the El Niño-like response to volcanic forcing in the year following the year when a volcanic eruption occurred. Although model results have varied in magnitude and even sign favoring different physical mechanisms that drive the ENSO response, recently unifying simplistic explanations were suggested. In our experiments with GFDL CM2.1, the ENSO response appears to be quite complex and is sensitive to the timing of the eruption, the East Pacific Equatorial Ocean preconditioning, as well as on how a model reproduces the entire ENSO cycle. We found that the ENSO response to volcanic impacts contains both stochastic and deterministic components. The stochastic component, defined as a response caused by a very small radiative perturbation, does not depend on the magnitude of the volcanic forcing and is stronger when an eruption occurs in a boreal winter or spring before the ENSO spring “predictability barrier.” Contrastingly, the deterministic response scales with respect to the magnitude of a volcanic forcing tending to prevail the stochastic response for eruptions occurred later in the year. The ocean dynamic thermostat and wind changes due to increasing of the land-ocean temperature gradients are the main mechanisms guiding the ENSO response to a volcanic eruption, with the former being more prolonged and important than the latter. POC: Dr. Ram, ext. 6503.
    Time: 10:30 am - 12:00 pm
    Location: Smagorinsky Seminar Room
  • August 13, 2018: FPO - Zhaoyi Shen
    FPO - Zhaoyi Shen
    FPO - Zhaoyi Shen
    Time: 10:00 am - 12:00 pm
    Location: Smagorinsky Seminar Room
  • August 16, 2018: AOS Workshop
    AOS Workshop
    AOS Workshop POC: Anna Valerio
    Time: All Day
    Location: Smagorinsky Seminar Room

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