Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa34a..05f&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA34A-05
Other
0300 Atmospheric Composition And Structure, 3300 Atmospheric Processes, 7514 Energetic Particles (2114)
Scientific paper
Energetic particle precipitation (EPP) in the polar atmosphere has important implications on stratospheric ozone chemistry. Solar protons or highly energetic electrons generated during solar storms cause sporadicly in situ production of stratospheric NOx and HOx radicals involved in catalytic ozone destruction. Further, NO produced continuously in the mesosphere and lower thermosphere by medium energy electron precipitation descends to the stratosphere during the polar winter, where it represents an additional, though variable source of NOx. The capability of MIPAS to measure all important NOy species, as well as ClO and HOCl with global coverage including the polar night regions make this instrument an ideal candidate to study EPP effects on stratospheric chemistry. We present a quantitative assessment of EPP-induced stratospheric composition changes as observed by MIPAS during 2002-2004, including the unusually strong solar proton event in October/November 2003. Enhanced levels of NOx in the upper stratosphere and lower mesosphere have been found for several winters within polar vortices. NOx was subsequently transformed to other NOy species, leading, for example, to a secondary upper stratospheric HNO3 maximum. The impact of upper stratospheric enhanced NOx levels, the mechanisms of their transformation to other NOy species, and their effect on the stratospheric ozone budget has been studied with chemical models. The stratospheric ozone loss in the polar regions reached 20 DU and lasted over months to years.
Funke Bernd
Lopez-Puertas Manuel
Reddmann Th.
Sinnhuber Miriam
Stiller G.
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