Thermal structure over the North Pole in the middle atmosphere of Mars during northern summer from MCS measurements

Details Thermal structure over the North Pole in the middle atmosphere of Mars during northern summer from MCS measurements Thermal structure over the North Pole in the middle atmosphere of Mars during northern summer from MCS measurements

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53e1564w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P53E-1564

Biology

[5210] Planetary Sciences: Astrobiology / Planetary Atmospheres, Clouds, And Hazes

Scientific paper

We examined the temperature fields at 0.1 Pa (~70 km) between Ls = 111° and 154° of MY 28 to 30 over the northern polar region of Mars from 30°N to 90°N. The study is based on observations from the Mars Climate Sounder (MCS) [McCleese et al., 2007] on the Mars Reconnaissance Orbiter (MRO) mission [Zurek and Smrekar, 2007]. Daytime temperatures have been selected between LT = 9.6 and LT = 18.0. A stationary wave number 3 pattern is evident between Ls = 111° and 148° (Fig. 1 and Fig. 2). The maxima are significantly narrower, longitudinally, than the minima. During this interval, the two maxima in temperature near longitudes -152°E and 100°E shifted slightly eastward by ~24° and ~5°, respectively. The third maximum at -32°E did not shift in longitude, although it moved northward. All three maxima also changed slightly in temperature as the season advanced. The maximum at 100°E increased by ~5 K, while the other two cooled off (by ~7 K and ~5 K, respectively). The Martian upper atmosphere thermal structure shown in Figs. 1 and 2 has not been described previously. Somewhat similar phenomena have been seen at higher altitudes between ~130 km and ~160 km during northern spring over the region from 60°S to 50°N from MGS aerobraking data [Withers et al, 2003]. It is possible that the structure at ~70 km is also due to topographic forcing of the thermal tide. Fig.1. The thermal field at 0.1 Pa between Ls = 111° - 114°.

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