African dust outbreaks

A satellite perspective of temporal and spatial variability over the tropical Atlantic Ocean

Huang Jingfeng, Chidong Zhang, Joseph M. Prospero

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

We describe the temporal evolution and spatial structure of extreme African dust outbreaks and their associated meteorological fields over West Africa and the tropical Atlantic using A-Train data and a global reanalysis product. We used Aqua.Moderate Resolution Imaging Spectroradiometer daily aerosol optical depth (AOD) to identify major dust outbreaks, defined as AOD events one standard deviation above the background along the African coast. Dry air outbreaks were defined using water vapor data of the Aqua Atmospheric Infrared Sounder. Dry air outbreaks do not always coincide with dust outbreaks. Most boreal summer outbreaks reached the West Indies between 10°N and 20°N, some traveling on to the southeastern United States; winter outbreaks moved to South America between 0° and 10°N. Outbreaks travel westward at an average speed of 1000 km d-1, reaching the Caribbean or South America in a week's time. The advance of a dust front is associated with decreases in water vapor (up to -1.0 g kg-1) and increases in temperature (up to 1.0 K) and, behind the fronts, an anticyclonic circulation. We used Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data to characterize dust altitude distributions. The vertical distribution of warm dry air is similar to that of dust observed in CALIPSO. The dust layer altitude decreases during transport across the Atlantic and is significantly lower in boreal winter than summer. The study highlights the temporal and spatial variability of African dust outbreaks, which are important to improving our understanding of climate impacts of African dust and Atlantic climate variability in general.

Original languageEnglish (US)
Article numberD05202
JournalJournal of Geophysical Research C: Oceans
Volume115
Issue number5
DOIs
StatePublished - 2010

Fingerprint

Atlantic Ocean
Dust
dust
Satellites
ocean
Aerosols
aerosols
CALIPSO
satellite observation
Steam
Optical radar
Infrared radiation
optical radar
optical thickness
winter
optical depth
climate
summer
water vapor
air

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

African dust outbreaks : A satellite perspective of temporal and spatial variability over the tropical Atlantic Ocean. / Jingfeng, Huang; Zhang, Chidong; Prospero, Joseph M.

In: Journal of Geophysical Research C: Oceans, Vol. 115, No. 5, D05202, 2010.

Research output: Contribution to journalArticle

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