The Role of the Quenching of O2(1) by Atomic Oxygen on 6.3~μm Atmospheric Radiances and its Impact on the Retrieval of Water Vapour

Details The Role of the Quenching of O2(1) by Atomic Oxygen on 6.3~μm Atmospheric Radiances and its Impact on the Retrieval of Water Vapour The Role of the Quenching of O2(1) by Atomic Oxygen on 6.3~μm Atmospheric Radiances and its Impact on the Retrieval of Water Vapour

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72a0512g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA72A-0512

Computer Science

Sound

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry, 0933 Remote Sensing

Scientific paper

The high sensitivity of the new generation of atmospheric IR sounders has made the remote sensing of the upper atmosphere a reality. Emission from the high atmospheric layers is, however, quite often in non-local thermodynamic equilibrium (non-LTE). To retrieve the atmospheric parameters accurately, the excitation mechanisms of the emitting energy levels have to be well known. The emission of water vapor at 6.3~μm is one such example, that is in non-LTE above about 55-60 km. The major sources of uncertainty in this emission come from the vibrational-vibrational energy rate of transfer between H2O(010) and O2(1), the yield of O2(1) from O3 photolysis and the thermal quenching of O2(1) by atomic oxygen. The latter has been measured only at high temperatures (1000-3500 K) until recently. Consequently, this posed a large uncertainty in H2O(010) populations and in its 6.3~μm atmospheric emission. The recent accurate measurements of this rate at room temperature (Kalogerakis et al., 2001) allow us to retrieve H2O in the mesosphere more accurately. We discuss in this paper the importance of this rate for the water vapor retrieval and its application to the H2O 6.3 μm measurements currently being taken by the SABER instrument on the TIMED satellite.

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