Long-term variability in Saharan dust transport and its link to North Atlantic sea surface temperature
An understanding of the atmospheric distribution of Saharan dust is crucial for understanding many Earth-system processes. We demonstrate here a model simulation indicating that the August-September dust amount in the Tropical Atlantic is linked to the basin-wide North Atlantic sea surface temperature (SST). The increasing SSTs from 1979 to 2005 are associated with a strengthening cyclonic anomaly at 700 hPa in the tropical East Atlantic, reducing Saharan dust outflow into the Tropical Atlantic at latitudes between 10°-20°N. A decreasing dust amount over the same region is also observed by the Advanced Very High Resolution Radiometer. Given the previously observed anti-correlation between dust and tropical cyclone (TC) activity, the long-term variation of North Atlantic SST can then directly influence TC activity by changing a TC's maximum potential intensity and indirectly by modulating the transport of the dust-laden Saharan Air Layer.
document
https://n2t.org/ark:/85065/d7vq32v9
eng
geoscientificInformation
Text
publication
2016-01-01T00:00:00Z
publication
2008-04-08T00:00:00Z
An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union.
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