African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean

Barkley, Anne E.; Prospero, Joseph M.; Mahowald, Natalie; Hamilton, Douglas S.; Popendorf, Kimberly J.; Oehlert, Amanda M.; Pourmand, Ali; Gatineau, Alexandre; Panechou-Pulcherie, Kathy; Blackwelder, Patricia; Gaston, Cassandra J.

doi:10.1073/pnas.1906091116

Title: African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean

Journal Article · 29 July 2019 · Proceedings of the National Academy of Sciences of the United States of America

DOI: https://doi.org/10.1073/pnas.1906091116 · OSTI ID:1594085

Barkley, Anne E. ^[1]; Prospero, Joseph M. ^[1];

^[2];

^[2]; Popendorf, Kimberly J. ^[1]; Oehlert, Amanda M. ^[1]; Pourmand, Ali ^[1]; Gatineau, Alexandre ^[3]; Panechou-Pulcherie, Kathy ^[3]; Blackwelder, Patricia ^[1];

^[1]

Univ. of Miami, Miami, FL (United States)
Cornell Univ., Ithaca, NY (United States)
ATMO Guyane, French Guina (France)

The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can robustly test this hypothesis and even fewer measurements of soluble P, which is readily available for stimulating primary production in the ocean. To test this hypothesis, we measured total and soluble P in long-range transported aerosols collected in Cayenne, French Guiana, a TAO coastal site located at the northeastern edge of the Amazon. Our measurements confirm that in boreal spring when African dust transport is greatest, dust supplies the majority of P, of which 5% is soluble. In boreal fall, when dust transport is at an annual minimum, we measured unexpectedly high concentrations of soluble P, which we show is associated with the transport of biomass burning (BB) from southern Africa. Integrating our results into a chemical transport model, we show that African BB supplies up to half of the P deposited annually to the Amazon from transported African aerosol. As such, this observational study links P-rich BB aerosols from Africa to enhanced P deposition in the Amazon. Contrary to current thought, we also show that African BB is a more important source of soluble P than dust to the TAO and oceans in the Southern Hemisphere and may be more important for marine productivity, particularly in boreal summer and fall.

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Research Organization:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Oceanic and Atmospheric Administration (NOAA); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: SC0006791

OSTI ID:: 1594085

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 116, Issue 33; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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