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Geophysical Research Abstracts Vol. 16, EGU2014-6488, 2014 EGU General Assembly 2014 © Author(s) 2014. CC Attribution 3.0 License.

Moon influence on equatorial atmospheric angular momentum
Christian Bizouard (1), Leonid Zotov (2), and Nikolay Sidorenkov (3)
(1) Observatoire de Paris, (2) Sternberg Astronomical Institute of Moscow State University, Russia, (3) Hydrometeorological Center, Moscow, Russia

The variation of the equatorial atmospheric angular momentum function, coordinated with respect to a star-fixed system, is investigated in relation with the lunar tide. We isolate the rapid fluctuations, below 30 days, where Moon motion has a possible influence. First we notice that pressure term and wind term are almost proportional, by contrast to celestial seasonal band (S1). This would mean that, in this frequency band, the torque of the atmosphere on the solid Earth mostly results from the equatorial bulge. Spectrum reveals sharp lunar tidal peaks at 13.66 days (O1 diurnal tide in the terrestrial frame) and 13.63 days, reflecting the Moon influence on meridional circulation. We also observe powerful episodic fluctuations between 5 and 8 days (up to 10 mas), possibly resulting from non linear effect of the O1 tide, or tidal waves 2Q1 (6.86 days) and 1 (7.095 days).