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Assimilated ozone from EOS-Aura: Evaluation of the tropopause region and tropospheric columns
Science Applications International Corporation, Beltsville, Maryland, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Science Applications International Corporation, Beltsville, Maryland, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, Maryland, USA
Science Applications International Corporation, Beltsville, Maryland, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Atmospheric Chemistry Modeling Group, Harvard University, Cambridge, Massachusetts, USA
Jet Propulsion Laboratory, Pasadena, California, USA
Jet Propulsion Laboratory, Pasadena, California, USA
Royal Dutch Meteorological Institute, De Bilt, Netherlands
Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA
Air Quality Research Division, Environment Canada, Downsview, Ontario, Canada
Aerological Station Payerne, MeteoSwiss, Payerne, Switzerland
Danish Meteorological Institute, Copenhagen, Denmark
Instituto Nacional de Tecnica Aeroespacial, Madrid, Spain
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
NASA GSFC, Wallops Flight Facility, Wallops Island, Virginia, USA
Science Systems and Applications Inc., Lanham, Maryland, USA
Retrievals from the Microwave Limb Sounder (MLS) and the Ozone Monitoring Instrument (OMI) on EOS-Aura were included in the Goddard Earth Observing System version 4 (GEOS-4) ozone data assimilation system. The distribution and daily to seasonal evolution of ozone in the stratosphere and troposphere during 2005 are investigated. In the lower stratosphere, where dynamical processes dominate, comparisons with independent ozonesonde and Measurement of Ozone and Water Vapour by Airbus In-Service Aircraft (MOZAIC) data indicate mean agreement within 10%. In the troposphere, OMI and MLS provide constraints on the ozone column, but the ozone profile shape results from the parameterized ozone chemistry and the resolved and parameterized transport. Assimilation of OMI and MLS data improves tropospheric column estimates in the Atlantic region but leads to an overestimation in the tropical Pacific and an underestimation in the northern high and middle latitudes in winter and spring. Transport and data biases are considered in order to understand these discrepancies. Comparisons of assimilated tropospheric ozone columns with ozonesonde data reveal root-mean-square (RMS) differences of 2.9–7.2 Dobson units (DU), which are smaller than the model-sonde RMS differences of 3.2–8.7 DU. Four different definitions of the tropopause using temperature lapse rate, potential vorticity (PV), and isentropic surfaces or ozone isosurfaces are compared with respect to their global impact on the estimated tropospheric ozone column. The largest sensitivity in the tropospheric ozone column is found near the subtropical jet, where the ozone- or PV-determined tropopause typically lies below the lapse rate tropopause.
Received 20 April 2007; accepted 17 January 2008; published 29 May 2008.
Citation: (2008), Assimilated ozone from EOS-Aura: Evaluation of the tropopause region and tropospheric columns, J. Geophys. Res., 113, D16S32, doi:10.1029/2007JD008863.
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