Computer Science – Sound
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa21a..10m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA21A-10
Computer Science
Sound
3240 Chaos, 0300 Atmospheric Composition And Structure, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry, 0933 Remote Sensing
Scientific paper
ISAMS is a limb-viewing infrared emission sensor which flew onboard the Upper Atmosphere Research Satellite (UARS) and took measurements from September 1991 until July 1992. ISAMS included a filter radiometer centered at 10 μ m (990--1010 cm-1) to measure the ozone concentration in the stratosphere and mesosphere. Comparisons between simultaneously retrieved ozone mixing ratios from ISAMS and Microwave Limb Sounder (MLS), also onboard UARS, indicate systematically smaller day--night differences for the ISAMS data (reaching values of ~= 35% at 60 km). Since limb emission in the 10 μ m region by ozone in the mesosphere is close to the optically thin limit, a fractional enhancement in the retrieved ozone should be explained by an unexpected similar fractional enhancement in the radiance. An explanation for the enhanced daytime radiance could be the non-LTE emission originated by the O3 vibrational levels which result highly pumped after O3 formation and radiative absorption. This effect should be not observed in the ISAMS nighttime data, since O is quickly consumed after local sunset to form ozone and the state population relaxes to LTE. Also, MLS measurements (at millimetre wavelengths) are immune to this non-thermal radiation. Using an updated O3 non-LTE model we have quantified the effects of non-thermal emission on ISAMS radiances; and analized the importance of the different processes that distribute the vibrationally excited O3 into its energy levels under non-thermal conditions. As most important results obtained we can cite: (i) daytime enhancements can be explained as due to non-LTE effects; and (ii) the data suggests a nascent distribution for the O3 vibrational states which favours the population of the higher states. This distribution is contrary to that usually assumed in previous modellings of the O3 infrared emissions.
Lopez-Puertas Manuel
Martin-Torres Francisco J.
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