Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32e..03w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P32E-03
Physics
5409 Atmospheres: Structure And Dynamics
Scientific paper
We have made Mars daily global maps including the polar maps and equatorial maps from Ls 135 to 310 using the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide-angle global map swaths taken from May 1999 to February 2000. We describe the seasonal distribution of Martian clouds during this period and report the cloud-tracked winds when available. In the north polar maps, dust and condensate clouds scatter around the cap edge during mid northern summer; active baroclinic storms and widespread wave clouds characterize late northern summer; polar hood clouds including haze, wave clouds, streak clouds and dust plumes dominate from early fall to mid winter. The dominant winds in the north polar maps are eastward during the whole period and seem to strengthen with time. There seems to be a cyclonic gyre in the 0ºW-90ºW sector from mid summer to early fall. In the south polar maps, the polar hood covers the seasonal polar cap in winter; active dust plumes scatter around the cap edge until mid southern spring; many dust activity centers occur near the exposed polar layered terrain in late southern spring; clouds near the terminator can be observed from late spring to mid summer. The dominant winds around the south polar cap shift from eastward to westward in mid southern spring. Off-cap winds dominate from late spring to mid summer. In the equatorial maps, the most prominent feature in mid northern summer is the equatorial cloud belt. The clouds on top of the volcanoes sometimes take the form of central patches and radiating lobes. The most prominent phenomena in mid northern fall are three regional dust storm events that originate in mid and high northern latitudes and transport dust southward across the equator through confined longitudinal bands.
Ingersoll P. A. P. A.
Wang Hai-Hong
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