A two-dimensional model of thermospheric nitric oxide sources and their contributions to the middle atmospheric chemical balance

Details A two-dimensional model of thermospheric nitric oxide sources and their contributions to the middle atmospheric chemical balance A two-dimensional model of thermospheric nitric oxide sources and their contributions to the middle atmospheric chemical balance

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..653v&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 8, p. 653-667.

Physics

12

Scientific paper

The NASA/Goddard Space Flight Center two-dimensional (GSFC 2D) photochemical transport model has been used to study the influence of thermospheric NO on the chemical balance of the middle atmosphere. Lower thermospheric NO sources are included in the GSFC 2D model in addition to the sources that are relevant to the stratosphere. A time series of hemispheric auroral electron power has been used to modulate the auroral NO production in the auroral zone. A time series of the Ottawa 10.7-cm solar flux index has been used as a proxy to modulate NO production at middle and low latitudes by solar EUV and soft X-rays. An interhemispheric asymmetry is calculated for the amounts of odd nitrogen in the polar stratosphere. We compute a <~3% enhancement in the odd nitrogen (NOy=N, NO, NO2, NO3, N2O5, BrONO2, ClONO2, HO2NO2, and HNO3) budget in the north polar stratosphere (latitude > 50°) due to thermospheric sources, whereas we compute a <~8% enhancement in the NOy budget in the south polar stratosphere (latitude > 50°).

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