Monday, 14 January 2002
Impact of covariance modeling and data selection on assimilated ozone
The ozone distribution in the upper troposphere and lower stratosphere is
needed in many geophysical applications. For example, it is needed in the
quantification of cross-tropopause fluxes, tropospheric ozone, and radiative
transfer calculations. Accurate estimates of ozone fields in the lowermost
stratosphere and troposphere can provide better first guess profiles for
retrievals of ozone from remote sensing instruments, and thus, improve our
ability to extract information from satellite observations.
Global three-dimensional ozone fields are produced in the DAO by
assimilating TOMS and SBUV observations into an ozone transport model.
Satellite instrument ozone observations, including those by TOMS and SBUV
instruments, have low vertical resolution in the upper troposphere and lower
stratosphere. Consequently, the assimilated ozone field in this region will
be sensitive to the choice of the assimilation method. We investigate the
sensitivity of the assimilated ozone in this region to specification of error
covariances and to data selection.
Supplementary URL: http://dao.gsfc.nasa.gov/pages/ozone_assim.html