Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene
Iron can be a growth-limiting nutrient for phytoplankton, modifying rates of net primary production, nitrogen fixation, and carbon export - highlighting the importance of new iron inputs from the atmosphere. The bioavailable iron fraction depends on the emission source and the dissolution during tra...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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Online Access: | https://doi.org/10.1029/2019GB006448 |
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ftncar:oai:drupal-site.org:articles_23231 2024-04-28T08:39:27+00:00 Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene Hamilton, Douglas S. (author) Moore, J. Keith (author) Arneth, Almut (author) Bond, Tami C. (author) Carslaw, Ken S. (author) Hantson, Stijn (author) Ito, Akinori (author) Kaplan, Jed O. (author) Lindsay, Keith (author) Nieradzik, Lars (author) Rathod, Sagar D. (author) Scanza, Rachel A. (author) Mahowald, Natalie M. (author) 2020-03 https://doi.org/10.1029/2019GB006448 en eng Global Biogeochemical Cycles--Global Biogeochem. Cycles--0886-6236--1944-9224 articles:23231 ark:/85065/d7xw4p08 doi:10.1029/2019GB006448 Copyright 2020 American Geophysical Union article Text 2020 ftncar https://doi.org/10.1029/2019GB006448 2024-04-04T17:34:52Z Iron can be a growth-limiting nutrient for phytoplankton, modifying rates of net primary production, nitrogen fixation, and carbon export - highlighting the importance of new iron inputs from the atmosphere. The bioavailable iron fraction depends on the emission source and the dissolution during transport. The impacts of anthropogenic combustion and land use change on emissions from industrial, domestic, shipping, desert, and wildfire sources suggest that Northern Hemisphere soluble iron deposition has likely been enhanced between 2% and 68% over the Industrial Era. If policy and climate follow the intermediate Representative Concentration Pathway 4.5 trajectory, then results suggest that Southern Ocean (>30 degrees S) soluble iron deposition would be enhanced between 63% and 95% by 2100. Marine net primary productivity and carbon export within the open ocean are most sensitive to changes in soluble iron deposition in the Southern Hemisphere; this is predominantly driven by fire rather than dust iron sources. Changes in iron deposition cause large perturbations to the marine nitrogen cycle, up to 70% increase in denitrification and 15% increase in nitrogen fixation, but only modestly impacts the carbon cycle and atmospheric CO2 concentrations (1-3 ppm). Regionally, primary productivity increases due to increased iron deposition are often compensated by offsetting decreases downstream corresponding to equivalent changes in the rate of phytoplankton macronutrient uptake, particularly in the equatorial Pacific. These effects are weaker in the Southern Ocean, suggesting that changes in iron deposition in this region dominates the global carbon cycle and climate response. 1852977 Article in Journal/Newspaper Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Global Biogeochemical Cycles 34 3 |
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Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Iron can be a growth-limiting nutrient for phytoplankton, modifying rates of net primary production, nitrogen fixation, and carbon export - highlighting the importance of new iron inputs from the atmosphere. The bioavailable iron fraction depends on the emission source and the dissolution during transport. The impacts of anthropogenic combustion and land use change on emissions from industrial, domestic, shipping, desert, and wildfire sources suggest that Northern Hemisphere soluble iron deposition has likely been enhanced between 2% and 68% over the Industrial Era. If policy and climate follow the intermediate Representative Concentration Pathway 4.5 trajectory, then results suggest that Southern Ocean (>30 degrees S) soluble iron deposition would be enhanced between 63% and 95% by 2100. Marine net primary productivity and carbon export within the open ocean are most sensitive to changes in soluble iron deposition in the Southern Hemisphere; this is predominantly driven by fire rather than dust iron sources. Changes in iron deposition cause large perturbations to the marine nitrogen cycle, up to 70% increase in denitrification and 15% increase in nitrogen fixation, but only modestly impacts the carbon cycle and atmospheric CO2 concentrations (1-3 ppm). Regionally, primary productivity increases due to increased iron deposition are often compensated by offsetting decreases downstream corresponding to equivalent changes in the rate of phytoplankton macronutrient uptake, particularly in the equatorial Pacific. These effects are weaker in the Southern Ocean, suggesting that changes in iron deposition in this region dominates the global carbon cycle and climate response. 1852977 |
author2 |
Hamilton, Douglas S. (author) Moore, J. Keith (author) Arneth, Almut (author) Bond, Tami C. (author) Carslaw, Ken S. (author) Hantson, Stijn (author) Ito, Akinori (author) Kaplan, Jed O. (author) Lindsay, Keith (author) Nieradzik, Lars (author) Rathod, Sagar D. (author) Scanza, Rachel A. (author) Mahowald, Natalie M. (author) |
format |
Article in Journal/Newspaper |
title |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
spellingShingle |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
title_short |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
title_full |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
title_fullStr |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
title_full_unstemmed |
Impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
title_sort |
impact of changes to the atmospheric soluble iron deposition flux on ocean biogeochemical cycles in the anthropocene |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019GB006448 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Global Biogeochemical Cycles--Global Biogeochem. Cycles--0886-6236--1944-9224 articles:23231 ark:/85065/d7xw4p08 doi:10.1029/2019GB006448 |
op_rights |
Copyright 2020 American Geophysical Union |
op_doi |
https://doi.org/10.1029/2019GB006448 |
container_title |
Global Biogeochemical Cycles |
container_volume |
34 |
container_issue |
3 |
_version_ |
1797570472789934080 |