HR: 1340h
AN: A33A-0140    [Abstracts]
TI: Assimilation of Aura Ozone Data
AU: * Stajner, I
EM: ivanka@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Code 900.3, Greenbelt, MD 20771 United States
AU: Hayashi, H
EM: hiroo@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Code 900.3, Greenbelt, MD 20771 United States
AU: Wargan, K
EM: wargan@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Code 900.3, Greenbelt, MD 20771 United States
AU: Chang, L
EM: lpchang@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Code 900.3, Greenbelt, MD 20771 United States
AU: Pawson, S
EM: pawson@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, NASA/Goddard Space Flight Center, Code 900.3, Greenbelt, MD 20771 United States
AB: This paper will present initial results from assimilating ozone data from Aura instruments into an existing ozone assimilation system at NASA's Global Modeling and Assimilation Office (GMAO). The assimilation includes total column ozone data together with stratospheric ozone profiles. These various data types are combined with a model forecast. The model includes parameterized chemistry modules for tropospheric and stratospheric ozone, including a simple "cold tracer" parameterization for heterogeneous processes that lead to ozone depletion. Resolved and sub-grid-scale transport are determined in the general circulation model (GCM) that is constrained by the GMAO's meteorological analyses. The assimilation system is being modified to include ozone data from EOS Aura instruments, either in place of or alongside other data. In the complete Aura configuration we plan to use all available OMI, MLS, HIRDLS, and possibly TES data. In reaching this system, intermediate steps will be taken, introducing one Aura ozone dataset at a time. The first step is likely to be using OMI in place of SBUV total ozone columns. The assimilated ozone fields will provide estimates of the global ozone distribution, including the lower stratosphere and the troposphere regions, where accurate estimates have been hard to obtain from data preceding EOS Aura. During the assimilation process, differences between ozone observations and the GCM forecasts are computed; these will be monitored to evaluate error characteristics of Aura ozone data. Assimilated Aura ozone data can be used in the GCM's radiation computations as an initial guess for the ozone distribution in the assimilation of infrared nadir radiance data from NASA's AIRS (Advanced Infrared Sounder) instrument. Both of these applications can have an impact on the skill of numerical weather forecasts, which will be investigated.
UR: http://gmao.gsfc.nasa.gov/research/ozone/
DE: 3337 Numerical modeling and data assimilation
DE: 3360 Remote sensing
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting