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ENSO modulation of interannual variability of dust aerosols over the northwest Indian ocean

DRS at CSIR-National Institute of Oceanography

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Field Value
 
Title ENSO modulation of interannual variability of dust aerosols over the northwest Indian ocean
 
Creator Banerjee, P.
PrasannaKumar, S.
 
Subject Chemistry and Biogeochemistry
Fisheries
Dust clouds
El Nino phenomena
ISW, Indian Ocean
 
Description Mineral dust is known to affect many aspects of the climate of the north Indian Ocean (IO) However, what controls its interannual variability over this region is largely unknown The authors study the mechanism controlling the interannual variability of dust aerosols in the principal dust belts bordering the northwest IO It is shown that annual dust activity to the north of the Persian Gulf has an inverse relation with preceding precipitation during October�December and soil moisture during current dust season (April�August) These are in turn remotely controlled by El Nino�Southern Oscillation (ENSO) through the modification of the intensity of convection over the Indo-Pacific warm pool region, which affects moisture flux to the dust sources While La Nina leads to a negative precipitation anomaly and more dust generation during the following summer, El Nino is responsible for the opposite During the summer following La Nina, the air�sea interaction leads to a lowering of geopotential height over the Indo-Iranian region, resulting in an increased gradient between the Indo-Iranian region and the surrounding regions This intensifies the dust-transporting northwesterly and northeasterly winds over the Arabian Peninsula The dust transport by the intensified low-level southwesterlies and upper-level westerlies is the main factor responsible for enhanced dust over the open northwest IO during the years following La Nina The Indian Ocean dipole potentially impacts the variability of dust over the northwest IO by modifying the moisture associated with El Nino.
 
Date 2016-02-08T10:59:18Z
2017-09-30T03:12:38Z
2016-02-08T10:59:18Z
2017-09-30T03:12:38Z
2016
 
Type Journal Article
 
Identifier Journal of Climate, vol.29(4); 2016; 1287-1303
0894-8755
http://drs.nio.org/drs/handle/2264/7689
 
Language en
 
Relation J Climate
 
Publisher American Meteorological Society