HR: 0800h
AN: A51D-0810    [Abstracts]
TI: Assimilation of solar occultation ozone data
AU: * Wargan, K
EM: wargan@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA, Goddard Space Flight Center, Code 900.8, Greenbelt, MD 20771 United States
AU: * Wargan, K
EM: wargan@gmao.gsfc.nasa.gov
AF: Science Applications International Corporation, 4600 Powder Mill Rd, Beltsville, MD 207052675 United States
AU: Stajner, I
EM: ivanka@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA, Goddard Space Flight Center, Code 900.8, Greenbelt, MD 20771 United States
AU: Stajner, I
EM: ivanka@gmao.gsfc.nasa.gov
AF: Science Applications International Corporation, 4600 Powder Mill Rd, Beltsville, MD 207052675 United States
AU: Pawson, S
EM: pawson@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA, Goddard Space Flight Center, Code 900.8, Greenbelt, MD 20771 United States
AU: Chang, L P
EM: lpchang@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA, Goddard Space Flight Center, Code 900.8, Greenbelt, MD 20771 United States
AU: Chang, L P
EM: lpchang@gmao.gsfc.nasa.gov
AF: Science Applications International Corporation, 4600 Powder Mill Rd, Beltsville, MD 207052675 United States
AB: Assimilation of ozone data from solar occultation instruments into a global ozone model at NASA's Global Modeling and Assimilation Office (GMAO) is presented. Solar occultation data have higher vertical resolution and better accuracy than ozone data from nadir-viewing operational instruments like the Solar Backscatter UltraViolet/2 SBUV/2 instrument, especially in the lower stratosphere. However, the sparsity of solar occultation measurements presents challenges in the assimilation process. Nevertheless, our earlier work showed that assimilation of Polar Ozone and Aerosol Measurement (POAM) III data improved the representation of Antarctic ozone profiles in wintertime significantly. We present results of new multi-year assimilation experiments that combine ozone observations from Stratospheric Aerosol and Gas Experiment (SAGE) II and POAM III instruments with SBUV/2 data within GMAO's ozone assimilation system. We found improvements in the representation of lower stratospheric and polar ozone following the addition of the occultation data. We discuss the implications for studies of temporal ozone changes and for possible applications to real-time analyses and forecasting of weather and pollution.
DE: 3337 Numerical modeling and data assimilation
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting