Herbert, RJ, Krom, MD, Carslaw, KS orcid.org/0000-0002-6800-154X et al. (5 more authors) (2018) The Effect of Atmospheric Acid Processing on the Global Deposition of Bioavailable Phosphorus from Dust. Global Biogeochemical Cycles, 32 (9). pp. 1367-1385. ISSN 0886-6236
Abstract
The role of dust as a source of bioavailable phosphorus (Bio-P) is quantified using a new parameterization for apatite dissolution in combination with global soil data maps and a global aerosol transport model. Mineral dust provides 31.2 Gg-P yr-1 of Bio-P to the oceans, with 14.3 Gg-P yr-1 from labile P present in the dust, and an additional 16.9 Gg-P yr-1 from acid dissolution of apatite in the atmosphere, representing an increase of 120%. The North Atlantic, northwest Pacific, and Mediterranean Sea are identified as important sites of Bio-P deposition from mineral dust. The acid dissolution process increases the fraction of total-P that is bioavailable from ~10% globally from the labile pool to 23% in the Atlantic Ocean, 45% in the Pacific Ocean, and 21% in the Indian Ocean, with an ocean global mean value of 22%. Strong seasonal variations, especially in the North Pacific, northwest Atlantic, and Indian Ocean, are driven by large-scale meteorology and pollution sources from industrial and biomass-burning regions. Globally constant values of total-P content and bioavailable fraction used previously do not capture the simulated variability. We find particular sensitivity to the representation of particle-to-particle variability of apatite, which supplies Bio-P through acid-dissolution, and calcium carbonate, which helps to buffer the dissolution process. A modest 10% external mixing results in an increase of Bio-P deposition by 18%. The total Bio-P calculated here (31.2 Gg-P yr-1) represents a minimum compared to previous estimates due to the relatively low total-P in the global soil map used.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2018. American Geophysical Union. All Rights Reserved. This is an author produced version of a paper published in Global Biogeochemical Cycles. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | phosphorus; mineral dust; acid processing; biogeochemistry; oceans; global modeling |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst for Climate & Atmos Science (ICAS) (Leeds) |
Funding Information: | Funder Grant number Leverhulme Trust RPG-406 EU - European Union 641816 |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Aug 2018 15:08 |
Last Modified: | 20 Feb 2019 01:39 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1029/2018GB005880 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:134565 |