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GFDL Events & Seminars

Upcoming GFDL events & seminars

Events and seminars
  • October 29, 2014: Characterizing key processes controlling variability in the oxidative capacity of the atmosphere
    Lee Murray (Columbia)
    Tropospheric abundances of the hydroxyl radical (OH) and other oxidants determine the “oxidative capacity” of the atmosphere, setting the lifetime before chemical removal of many air pollutants and reactive greenhouse gases such as methane. Understanding the mechanisms controlling oxidant variability in the past and present is important if we are to predict how their levels may change in a warming world. Here, I present work aimed at identifying, characterizing, and understanding the natural and anthropogenic processes that drive variability in the oxidative capacity. I first derive from steady-state assumptions a simple linear relationship relating global mean OH to convolved changes in tropospheric ozone photolysis frequencies, water vapor concentrations, and the ratio of reactive nitrogen to reduced carbon emissions, and show that this relationship holds across a range of emission and climate conditions in a single model (the global GEOS-Chem Chemistry-Transport Model). I then apply this relationship to explain the large spread in global mean OH and its temporal evolution simulated by the ensemble members of the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), finding an additional strong sensitivity to inter-model variability in the NOx lifetime and the efficiency of the hydrocarbon oxidation mechanism. I next demonstrate that space-based satellite observations of stratospheric ozone (a proxy for tropospheric ozone photolysis frequencies), water vapor, and tropospheric columns of NO2 and CO can be combined into a proxy for temporal (monthly) variability in OH at the local scale over the past decade. Previous work has shown that lightning NOx emissions are a strong lever on tropospheric oxidizing capacity, and I conclude with preliminary estimates quantifying the chemistry-climate feedback from this key process on the oxidant chemistry across the 21st century, using the GISS ModelE2 chemistry-climate model.
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • October 30, 2014: Varying Planetary Heat Sink and the Global Warming Hiatus
    Ka-Kit Tung (U of Washington)
    Varying Planetary Heat Sink and the Global Warming Hiatus
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • November 13, 2014: TBA
    Dorian Abbot (U of Chicago)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • November 19, 2014: TBA
    Monika Barcikowska (Princeton U)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • November 20, 2014: tba
    Dan Vimont (U of Wisconsin)
    tba
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • December 4, 2014: TBA
    Gabriel Katul (Duke U.)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • December 10, 2014: TBA
    Lakshmi Krishnamurthy (UCAR/GFDL)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • January 14, 2015: TBA
    Griffies Guest (TBA)
    TBA
    Time: 12:00 pm - 1:00 pm
    Location: Smagorinsky Seminar Room
  • January 22, 2015: TBA
    Anne Thompson (NASA/GSFC)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • January 28, 2015: Poster Expo
    Poster Expo (GFDL)
    Posters
    Time: All Day
    Location: Smagorinsky Seminar Room
  • January 29, 2015: TBA
    Susan Lozier (Duke University)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • February 5, 2015: TBA
    Mian Chin (NASA)
    TBA
    Time: 2:00 pm - 3:00 pm
    Location: Smagorinsky Seminar Room
  • February 12, 2015: TBA
    Jean-Francois Lamarque (UCAR)
    TBA
    Time: 2:00 pm - 3:00 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 5, 2015: TBA
    Alberto Naveira-Garabat (U of Southampton, UK)
    TBA
    Time: 2:00 pm - 3:00 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 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

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