期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 10, 页码 3730-3738出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL064004
关键词
topographic circulation; dust; Mars; volcanoes; mesoscale
资金
- NASA Jet Propulsion Laboratory
- Caltech [1471216]
- NASA [NNX14AM32G]
- NASA [NNX14AM32G, 678589] Funding Source: Federal RePORTER
Modeling suggests that thermal circulations over Mars's highest volcanoes transport water vapor and dust from the surface into the middle atmosphere, forming detached layers in these constituents. Intense vertical mixing also takes place in regional and global dust storms, which can generate detached layers that are extreme in both altitude and magnitude. Here we employ observations by the Mars Climate Sounder (MCS) on board Mars Reconnaissance Orbiter, taking advantage of improved vertical coverage in MCS's aerosol retrievals, to discover a new class of extreme detached dust layers (EDDLs). Observed during minimal dust storm activity and furthermore distinguished by their potentially large and measurable horizontal extent (>1000km), these EDDLs cluster near Olympus Mons and the Tharsis Montes, from which they likely originate. The existence of these EDDLs suggests that vertical mixing by topographic circulations can be much stronger than previously modeled and more frequent than previously observed.
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