Open AccessAnalysis of winter dust activity off the coast of West Africa using a new 24‐year over‐water advanced very high resolution radiometer satellite dust climatology
Author(s) -
Evan Amato T.,
Heidinger Andrew K.,
Knippertz Peter
Publication year - 2006
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2005jd006336
Subject(s) - advanced very high resolution radiometer , environmental science , climatology , satellite , mineral dust , radiometer , vegetation (pathology) , precipitation , total ozone mapping spectrometer , tropical atlantic , normalized difference vegetation index , atmospheric sciences , oceanography , sea surface temperature , remote sensing , meteorology , geology , climate change , geography , aerosol , ozone layer , stratosphere , medicine , pathology , aerospace engineering , engineering
A 24‐year (1982–2005) winter daytime advanced very high resolution radiometer (AVHRR) data set has been processed utilizing a new over‐water dust detection algorithm. The dust data are for the oceanic regions surrounding West Africa and provide a long‐term remotely sensed continuous record of dustiness in the region. These AVHRR dust observations are comparable to dust records produced via the Total Ozone Mapping Spectrometer and Meteosat instruments. Strong positive correlations between the wintertime Jones North Atlantic Oscillation index and this dust record are observed across the entire oceanic region, corroborating earlier studies on the relationship between the two. Also consistent with previous investigations, we find more regional positive and negative correlations between dust and the wintertime Niño 3.4 index and summertime Sahelian precipitation, respectively. Also, unique to satellite studies of interannual dust variability over the North Atlantic, we develop a wintertime AVHRR normalized difference vegetation index time series for the Sahel region. A strong relationship is seen between tropical North Atlantic dustiness and this vegetation index, suggesting the possibility that vegetation changes in the Sahel play an important role in variability of downwind dustiness.