Mesospheric doppler wind measurements from Aura Microwave Limb Sounder (MLS)

Details Mesospheric doppler wind measurements from Aura Microwave Limb Sounder (MLS) Mesospheric doppler wind measurements from Aura Microwave Limb Sounder (MLS)

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42.1246w&link_type=abstract

Advances in Space Research, Volume 42, Issue 7, p. 1246-1252.

Computer Science

Sound

6

Scientific paper

This paper describes a microwave limb technique for measuring Doppler wind in the Earth’s mesosphere. The research algorithm has been applied to Aura Microwave Limb Sounder (MLS) 118.75 GHz measurements where the O2 Zeeman lines are resolved by a digital autocorrelation spectrometer. A precision of ˜17 m/s for the line-of-sight (LOS) wind is achieved at 80 92 km, which corresponds to radiometric noise during 1/6 s integration time. The LOS winds from Aura MLS are mostly in the meridional direction at low- and mid-latitudes with vertical resolution of ˜8 km. This microwave Doppler technique has potential to obtain useful winds down to ˜40 km of the Earth’s atmosphere if measurements from other MLS frequencies (near H2O, O3, and CO lines) are used. Initial analyses show that the MLS winds from the 118.75 GHz measurements agree well with the TIDI (Thermosphere Ionosphere Mesosphere Energetics and Dynamics Doppler Interferometer) winds for the perturbations induced by a strong quasi 2-day wave (QTDW) in January 2005. Time series of MLS winds reveal many interesting climatological and planetary wave features, including the diurnal, semidiurnal tides, and the QTDW. Interactions between the tides and the QTDW are clearly evident, indicating possible large tidal structural changes after the QTDW events dissipate.

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