Atmospheric Transport of North African Dust-Bearing Supermicron Freshwater Diatoms to South America: Implications for Iron Transport to the Equatorial North Atlantic Ocean

Barkley, Anne E.; Olson, Nicole E.; Prospero, Joseph M.; Gatineau, Alexandre; Panechou, Kathy; Maynard, Nancy G.; Blackwelder, Patricia; China, Swarup; Ault, Andrew P.; Gaston, Cassandra J.

doi:10.1029/2020gl090476

Title: Atmospheric Transport of North African Dust-Bearing Supermicron Freshwater Diatoms to South America: Implications for Iron Transport to the Equatorial North Atlantic Ocean

Journal Article · Mon Feb 01 00:00:00 EST 2021 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2020gl090476· OSTI ID:1779282

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Univ. of Miami, Miami, FL (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
ATMO-Guyane, Remire-Montjoly Guyane (France)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

The equatorial North Atlantic Ocean (NAO) is a nutrient-limited ecosystem that relies on the deposition of long-range transported iron (Fe)-containing aerosols to stimulate primary productivity. Using microscopy, we characterized supermicron and supercoarse mode African aerosols transported to the western NAO in boreal winter/spring. In this work, we detected three particle types including African dust, primary biological aerosol particles, and freshwater diatoms (FDs). FDs contained 4% Fe by weight due to surficial dust inclusions that may be susceptible to chemical processing and dissolution. FDs were typically larger than dust particles and comprised 38% of particles between 10 and 18 μm in diameter. The low density, high surface-area-to-volume ratio, and large aspect ratios of FD particles suggest a mechanism by which they can be carried great distances aloft. These same properties likely increase the residence time of FDs in surface waters thereby increasing the time for Fe dissolution and their potential impact on marine biogeochemical cycles.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830; AGS-1944958

OSTI ID:: 1779282

Report Number(s):: PNNL-SA-155874

Journal Information:: Geophysical Research Letters, Vol. 48, Issue 5; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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aerosol
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dust supercoarse mode
iron

Title: Atmospheric Transport of North African Dust-Bearing Supermicron Freshwater Diatoms to South America: Implications for Iron Transport to the Equatorial North Atlantic Ocean

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