Validation of the self-consistency of GOMOS NO3, NO2 and O3 data using chemical data assimilation

Details Validation of the self-consistency of GOMOS NO3, NO2 and O3 data using chemical data assimilation Validation of the self-consistency of GOMOS NO3, NO2 and O3 data using chemical data assimilation

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110107m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 10, CiteID L10107

Physics

Geophysics

14

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Mathematical Geophysics: Modeling, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation

Scientific paper

The NO3 measurement by the GOMOS instrument on board the ENVISAT platform is the first satellite measurements of this species. The simultaneous measurements of O3 and NO2, which are strongly coupled chemically to NO3, allow us to test the self-consistency of the GOMOS measurements of the different species. In this paper, the self-consistency of the nighttime measurements by GOMOS of O3, NO2 and NO3 are tested using chemical data assimilation. Measurements obtained between 25 and 55 km during two distinct periods are assimilated. Analyzed NO3 (i.e., NO3 calculated by the model after assimilation of GOMOS O3 and NO2 data) are then compared to corresponding GOMOS NO3 measurements in correlation plots (GOMOS NO3 versus analyzed NO3). Overall, the differences between the NO3 measurements and corresponding analyzed NO3 are found to be small, about 10% on average. The linear regressions for both periods are also found to be close to the 1-to-1 line with small standard errors. This agreement indicates that O3, NO2 and NO3 GOMOS measurements are self consistent chemically and that there is no substantial bias in GOMOS NO3 data. It also suggests that the nighttime NO3 chemistry is well understood.

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