NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Dust Transport, Deposition and Radiative Effects Observed from MODISCarlson (1977) used satellite (AVHRR) observation of dust episodes 3 estimate that 90 tg of dust are emitted from Africa (0-30 N) to the Atlantic Ocean between June and August. MODIS systematic measurements of aerosol optical thickness (AOT) and the fraction of the AOT (f) due to the fine mode (see Remer et al abstract), are used to derive the column concentration, flux and deposition of African dust over the Atlantic Ocean. The main data set is for 2001 but the results are consistent with MODIS measurements from 2002. The analysis first determines the properties of maritime baseline aerosol (AOT=0.06, f=0.5); followed by linear scaling of the dust AOT and the anthropogenic AOT, based on MODIS measured values of the fraction "f" being 0.9 for anthropogenic aerosol and 0.5 for dust. NCEP winds are used in the analysis and are evaluated against observed dust movements between the Terra and Aqua passes (see Koren et al. abstract). Monthly values of dust transport and deposition are calculated. Preliminary results show that 280 tg of dust are emitted annually from Africa to the Atlantic Ocean between 20s and 30N, with 40 tg returning to Africa and Europe between 30N and 50N. 85 tg reach the Americas, with 130-150 tg are deposited in the Atlantic Ocean. The results are compared with dust transport models that indicate 110-230 tg of dust being deposited in the Ocean. It is interesting to note that the early estimates of Carlson (1977) and Carlson & Prosper0 (1972) are very close to our estimate from MODIS of 100 tg for the same latitude range and monthly period.
Document ID
20040013413
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Kaufman, Y. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Koren, I.
(National Academy of Sciences - National Research Council United States)
Remer, L. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tanre, D.
(Lille-1 Univ. Villeneuve-d'Asoq, France)
Ginoux, P.
(Princeton Univ. NJ, United States)
Fan, S.
(Princeton Univ. NJ, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: 2nd International Workshop on Mineral Dust
Location: Paris
Country: France
Start Date: September 10, 2003
End Date: September 12, 2003
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available