Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=26601301
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
On the decadal scale correlation between African dust and Sahel rainfall: The
role of Saharan heat low-forced winds
#MMPMID26601301
Wang W
; Evan AT
; Flamant C
; Lavaysse C
Sci Adv
2015[Oct]; 1
(9
): e1500646
PMID26601301
show ga
A large body of work has shown that year-to-year variations in North African dust
emission are inversely proportional to previous-year monsoon rainfall in the
Sahel, implying that African dust emission is highly sensitive to vegetation
changes in this narrow transitional zone. However, such a theory is not supported
by field observations or modeling studies, as both suggest that interannual
variability in dust is due to changes in wind speeds over the major emitting
regions, which lie to the north of the Sahelian vegetated zone. We reconcile this
contradiction showing that interannual variability in Sahelian rainfall and
surface wind speeds over the Sahara are the result of changes in lower
tropospheric air temperatures over the Saharan heat low (SHL). As the SHL warms,
an anomalous tropospheric circulation develops that reduces wind speeds over the
Sahara and displaces the monsoonal rainfall northward, thus simultaneously
increasing Sahelian rainfall and reducing dust emission from the major dust
"hotspots" in the Sahara. Our results shed light on why climate models are, to
date, unable to reproduce observed historical variability in dust emission and
transport from this region.
free
free
free
