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Dust Transport and Deposition Observed from the Terra-MODIS Space ObservationsMeteorological observations, in situ data and satellite images of dust episodes were used already in the 1970s to estimate that 100 tg of dust are transported from Africa over the Atlantic Ocean every year between June and August and deposited in the Atlantic Ocean and the Americas. Desert dust is a main source of nutrients to oceanic biota and the Amazon forest, but deteriorates air quality and caries pathogens as shown for Florida. Dust affects the Earth radiation budget, thus participating in climate change and feedback mechanisms. There is an urgent need for new tools for quantitative evaluation of the dust distribution, transport and deposition. The Terra spacecraft launched at the dawn of the last millennium provides first systematic well calibrated multispectral measurements from the MODIS instrument, for daily global analysis of aerosol. MODIS data are used here to distinguish dust from smoke and maritime aerosols and evaluate the African dust column concentration, transport and deposition. We found that 230+/-80 tg of dust are transported annually from Africa to the Atlantic Ocean, 30 tg return to Africa and Europe, 70 tg reach the Caribbean, 45 tg fertilize the Amazon Basin, 4 times as previous estimates thus explaining a paradox regarding the source of nutrition to the Amazon forest, and 120+/-40 tg are deposited in the Atlantic Ocean. The results are compared favorably with dust transport models for particle radius less than or equal to 12 microns. This study is a first example of quantitative use of MODIS aerosol for a geophysical study.
Document ID
20040074238
Acquisition Source
Goddard Space Flight Center
Document Type
Abstract
Authors
Kaufman, Y. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Koren, I.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Remer, L. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tanre, D.
(Universite des Sciences et Techniques de Lille France)
Fan, Ginoux
(Princeton Univ. NJ, United States)
Fan, S.
(Princeton Univ. NJ, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: AGU Fall 2003 Meeting
Location: San Francisco, CA
Country: United States
Start Date: December 8, 2003
End Date: December 12, 2003
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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