Dust generation and drought patterns in Africa from helium-4 in a modern Cape Verde coral

Details Dust generation and drought patterns in Africa from helium-4 in a modern Cape Verde coral Dust generation and drought patterns in Africa from helium-4 in a modern Cape Verde coral

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520820m&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 20, CiteID L20820

Physics

4

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Hydrology: Drought, Geochemistry: Marine Geochemistry (4835, 4845, 4850), Paleoceanography: Corals (4220)

Scientific paper

We show that helium-4 (4He) concentrations in a modern Porites coral from Cape Verde provides a robust reconstruction of mineral dust loading over the Eastern Tropical Atlantic from mid-1950's to mid-1990's. The 4He record demonstrates pronounced increases in dust emission from North Africa associated with the severe droughts in the Sahel. Our record provides direct evidence that dust emission rates in the 1950's, prior to the onset of the Sahel droughts, were a factor of nine lower than during 1980-84. This large change in dust emission rate indicates global aerosol contents would have increased by ~45% over this period, which may have contributed to a reduction in solar radiation reaching the Earth's surface. We find that dust emission from North Africa is most closely related to drought patterns, rather than to changes in atmospheric circulation patterns resulting from climate oscillations, such as North Atlantic Oscillations and El Nino/Southern Oscillation.

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