The diurnal variation of OH in the mesosphere measured by SHIMMER: Insights into the mesospheric cloud environment

Details The diurnal variation of OH in the mesosphere measured by SHIMMER: Insights into the mesospheric cloud environment The diurnal variation of OH in the mesosphere measured by SHIMMER: Insights into the mesospheric cloud environment

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa41d..01e&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA41D-01

Computer Science

Sound

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334)

Scientific paper

SHIMMER, the Spatial Heterodyne Imager for Mesospheric Radicals is the primary payload of STPSat-1, a small satellite scheduled launched in March 2007. SHIMMER is a compact, high resolution Spatial Heterodyne Spectroscopy (SHS) instrument to measure hydroxyl (OH) and mesospheric clouds. In contrast to many other atmospheric missions that are in sun-synchronous orbits, the STPSat-1 orbit precesses by about 30 minutes in local time per day, which allows the investigation of local time effects. Here we present measurements of the diurnal variation of mesospheric OH. In the northern summer, around 80 km altitude, where the HOx lifetime increases from hours to days, we find disagreements between the data and a photochemical model that is constrained by Microwave Limb Sounder data at a fixed local time (approx. 1300 LT). We suggest that this is evidence of significant diurnal dynamic perturbations at these altitudes. Here we present a similar analysis for the Southern summer of 2007-08. Our results likely have broad implications for understanding local time variations in mesospheric clouds as well as trace constituents such as H2O and ozone. SHIMMER is a joint effort between the Naval Research Laboratory and the DoD Space Test Program.

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