Investigating Mesospheric Hydroxyl Using SHIMMER Data (Invited)

Details Investigating Mesospheric Hydroxyl Using SHIMMER Data (Invited) Investigating Mesospheric Hydroxyl Using SHIMMER Data (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa53a..04e&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA53A-04

Computer Science

Sound

[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry

Scientific paper

The Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER) on STPSat-1 was a high resolution, ultraviolet, mesospheric limb sounder. Using Spatial Heterodyne Spectroscopy, SHIMMER imaged the limb near 309nm with a spectral resolution of ~250mÅ, observing the hydroxyl (OH) A2Σ+--X2Π(0,0) band and polar mesospheric clouds. The STPSat-1 mission lasted 2.5 years starting in April 2007 and high quality OH data were obtained from SHIMMER continuously throughout that period. The low inclination orbit and seasonal yaw cycle allowed SHIMMER to measure up to about 58° latitude in the summer hemisphere and up to about 12° in the winter hemisphere. The orbit precessed approximately 30 minutes per day, thus diurnal variations in the OH abundance can be investigated. In this presentation, we show that around local noon SHIMMER OH densities compare well with Microwave Limb Sounder (MLS) OH densities between 60-90km altitude for different latitudes, and seasons. We present SHIMMER OH densities and atmospheric Rayleigh scattering data suggesting that an OH model over-estimation reported using data from the Middle Atmosphere High Resolution Spectrograph Investigation (MAHRSI) was likely due to a calibration issue of the MAHRSI data. Moreover, we will present initial results from studying the diurnal variation of mesospheric OH using SHIMMER data compared with the diurnal variation of ozone using SABER data and with photochemical model results.

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