nerc.ac.uk

Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean

Pinedo-González, Paulina; Hawco, Nicholas J.; Bundy, Randelle M.; Armbrust, E. Virginia; Follows, Michael J.; Cael, B.B. ORCID: https://orcid.org/0000-0003-1317-5718; White, Angelicque E.; Ferrón, Sara; Karl, David M.; John, Seth G.. 2020 Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean. Proceedings of the National Academy of Sciences, 117 (45). 27862-27868. https://doi.org/10.1073/pnas.2010315117

Full text not available from this repository.

Abstract/Summary

Fossil-fuel emissions may impact phytoplankton primary productivity and carbon cycling by supplying bioavailable Fe to remote areas of the ocean via atmospheric aerosols. However, this pathway has not been confirmed by field observations of anthropogenic Fe in seawater. Here we present high-resolution trace-metal concentrations across the North Pacific Ocean (158°W from 25°to 42°N). A dissolved Fe maximum was observed around 35°N, coincident with high dissolved Pb and Pb isotope ratios matching Asian industrial sources and confirming recent aerosol deposition. Iron-stable isotopes reveal in situ evidence of anthropogenic Fe in seawater, with low δ56Fe (−0.23‰ > δ56Fe > −0.65‰) observed in the region that is most influenced by aerosol deposition. An isotope mass balance suggests that anthropogenic Fe contributes 21–59% of dissolved Fe measured between 35° and 40°N. Thus, anthropogenic aerosol Fe is likely to be an important Fe source to the North Pacific Ocean.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1073/pnas.2010315117
ISSN: 0027-8424
Date made live: 10 Dec 2020 14:54 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/529133

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...