The effect of dust on the martian polar vortices

被引：27

作者：

Guzewich, Scott D. ^{[1
,2
,3
]}

Toigo, A. D. ^{[4
]}

Waugh, D. W. ^{[5
]}

机构：

[1] NASA GSFC, CRESST, Greenbelt, MD 20771 USA

[2] NASA GSFC, Planetary Syst Lab, Greenbelt, MD 20771 USA

[3] Univ Space Res Assoc, 7178 Columbia Gateway Dr, Columbia, MD 21046 USA

[4] Johns Hopkins Univ, Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

[5] Johns Hopkins Univ, Dept Earth & Planetary Sci, 301 Olin Hall,3400 N Charles St, Baltimore, MD 21218 USA

来源：

ICARUS | 2016年 / 278卷

关键词：

Mars; atmosphere; Atmospheres; dynamics; Meteorology; GENERAL-CIRCULATION MODEL; ZONAL-MEAN CIRCULATION; MIDDLE-ATMOSPHERE; POTENTIAL VORTICITY; MARS; SIMULATION; STORMS; DYNAMICS; ORIGIN; CLOUDS;

D O I：

10.1016/j.icarus.2016.06.009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The influence of atmospheric dust on the dynamics and stability of the martian polar vortices is examined, through analysis of Mars Climate Sounder observations and MarsWRF general circulation model simulations. We show that regional and global dust storms produce "transient vortex warming" events that partially or fully disrupt the northern winter polar vortex for brief periods. Increased atmospheric dust heating alters the Hadley circulation and shifts the downwelling branch of the circulation poleward, leading to a disruption of the polar vortex for a period of days to weeks. Through our simulations, we find this effect is dependent on the atmospheric heating rate, which can be changed by increasing the amount of dust in the atmosphere or by altering the dust optical properties (e.g., single scattering albedo). Despite this, our simulations show that some level of atmospheric dust is necessary to produce a distinct northern hemisphere winter polar vortex. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：100 / 118

页数：19

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