Acclimation of Phytoplankton Fe:C Ratios Dampens the Biogeochemical Response to Varying Atmospheric Deposition of Soluble Iron

Wiseman, N. A.; Moore, J. K.; Twining, B. S.; Hamilton, D. S.; Mahowald, N. M.

doi:10.1029/2022gb007491

Acclimation of Phytoplankton Fe:C Ratios Dampens the Biogeochemical Response to Varying Atmospheric Deposition of Soluble Iron

Journal Article · Sat Apr 01 00:00:00 EDT 2023 · Global Biogeochemical Cycles

DOI:https://doi.org/10.1029/2022gb007491· OSTI ID:2420540

^[1]; Moore, J. K. ^[2]; ^[3]; ^[4]; ^[5]

Department of Earth System Science University of California Irvine Irvine CA USA; OSTI
Department of Earth System Science University of California Irvine Irvine CA USA
Bigelow Laboratory for Ocean Sciences East Boothbay ME USA
Marine, Earth, and Atmospheric Sciences North Carolina State University Raleigh NC USA; Department of Earth and Atmospheric Science Cornell University Ithaca NY USA
Department of Earth and Atmospheric Science Cornell University Ithaca NY USA

Abstract

Dissolved iron (dFe) plays an important role in regulating marine productivity. In high nutrient, low chlorophyll regions (>33% of the global ocean), iron is the primary growth limiting nutrient, and elsewhere iron can regulate nitrogen fixation by diazotrophs. The link between iron availability and carbon export is strongly dependent on the phytoplankton iron quotas or cellular Fe:C ratios. This ratio varies by more than an order of magnitude in the open ocean and is positively correlated with ambient dFe concentrations in field observations. Representing Fe:C ratios within models is necessary to investigate how ocean carbon cycling will interact with perturbations to iron cycling in a changing climate. The Community Earth System Model ocean component was modified to simulate dynamic, group‐specific, phytoplankton Fe:C that varies as a function of ambient iron concentration. The simulated Fe:C ratios improve the representation of the spatial trends in the observed Fe:C ratios. The acclimation of phytoplankton Fe:C ratios dampens the biogeochemical response to varying atmospheric deposition of soluble iron, compared to a fixed Fe:C ratio. However, varying atmospheric soluble iron supply has first order impacts on global carbon and nitrogen fluxes and on nutrient limitation spatial patterns. Our results suggest that pyrogenic Fe is a significant dFe source that rivals mineral dust inputs in some regions. Changes in dust flux and iron combustion sources (anthropogenic and wildfires) will modify atmospheric Fe inputs in the future. Accounting for dynamic phytoplankton iron quotas is critical for understanding ocean biogeochemistry and projecting its response to variations in atmospheric deposition.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; SC0016539; SC0021302; SC0022177

OSTI ID:: 2420540

Alternate ID(s):: OSTI ID: 1970413

Journal Information:: Global Biogeochemical Cycles, Journal Name: Global Biogeochemical Cycles Journal Issue: 4 Vol. 37; ISSN 0886-6236

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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