Tropical Rains Controlling Deposition of Saharan Dust Across the North Atlantic Ocean.

Does, Michèlle , Brummer, Geert‐Jan A. , Crimpen, Fleur C. J., Korte, Laura F., Mahowald, Natalie M., Merkel, Ute , Yu, Hongbin, Zuidema, Paquita and Stuut, Jan‐Berend W. (2020) Tropical Rains Controlling Deposition of Saharan Dust Across the North Atlantic Ocean. Geophysical Research Letters, 47 (5). Art.Nr. e2019GL086867. DOI 10.1029/2019GL086867.

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Abstract

Mineral dust plays an important role in the atmospheric radiation budget as well as in the ocean carbon cycle through fertilization and by ballasting of settling organic matter. However, observational records of open‐ocean dust deposition are sparse. Here, we present the spatial and temporal evolution of Saharan dust deposition over 2 years from marine sediment traps across the North Atlantic, directly below the core of the Saharan dust plume, with highest dust fluxes observed in summer. We combined the observed deposition fluxes with model simulations and satellite observations and argue that dust deposition in the Atlantic is predominantly controlled by summer rains. The dominant depositional pathway changes from wet deposition in summer to dry deposition in winter. Wet deposition has previously been suggested to increase the release of dust‐derived nutrients and their bioavailability, which may be a key contributor to surface‐ocean productivity in remote and oligotrophic parts of the oceans.

Document Type: Article
Keywords: mineral dust; Atlantic Ocean; dust deposition; wet deposition; ocean fertilization
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2019GL086867
ISSN: 0094-8276
Related URLs:
Projects: PalMod
Date Deposited: 15 Apr 2020 09:45
Last Modified: 15 Apr 2020 09:45
URI: http://oceanrep.geomar.de/id/eprint/49487

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