The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1
We investigated the simulated iron budget in ocean surface waters in the 1990s and 2090s using the Community Earth System Model version 1 and the Representative Concentration Pathway 8.5 future CO2 emission scenario. We assumed that exogenous iron inputs did not change during the whole simulation pe...
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ftcdlib:qt9pv2q80s 2023-05-15T18:25:15+02:00 The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 Misumi, K. Lindsay, K. Moore, J. K Doney, S. C Bryan, F. O Tsumune, D. Yoshida, Y. 33 - 55 2014-01-04 application/pdf http://www.escholarship.org/uc/item/9pv2q80s english eng eScholarship, University of California qt9pv2q80s http://www.escholarship.org/uc/item/9pv2q80s Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Misumi, K.; Lindsay, K.; Moore, J. K; Doney, S. C; Bryan, F. O; Tsumune, D.; et al.(2014). The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1. Biogeosciences, 11(1), 33 - 55. doi:10.5194/bg-11-33-2014. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/9pv2q80s Physical Sciences and Mathematics equatorial pacific-ocean dissolved iron southern-ocean mineral dust organic-matter indian-ocean global ocean arabian sea carbon biogeochemistry article 2014 ftcdlib https://doi.org/10.5194/bg-11-33-2014 2016-04-02T19:12:11Z We investigated the simulated iron budget in ocean surface waters in the 1990s and 2090s using the Community Earth System Model version 1 and the Representative Concentration Pathway 8.5 future CO2 emission scenario. We assumed that exogenous iron inputs did not change during the whole simulation period; thus, iron budget changes were attributed solely to changes in ocean circulation and mixing in response to projected global warming, and the resulting impacts on marine biogeochemistry. The model simulated the major features of ocean circulation and dissolved iron distribution for the present climate. Detailed iron budget analysis revealed that roughly 70% of the iron supplied to surface waters in high-nutrient, low-chlorophyll (HNLC) regions is contributed by ocean circulation and mixing processes, but the dominant supply mechanism differed by region: upwelling in the eastern equatorial Pacific and vertical mixing in the Southern Ocean. For the 2090s, our model projected an increased iron supply to HNLC waters, even though enhanced stratification was predicted to reduce iron entrainment from deeper waters. This unexpected result is attributed largely to changes in gyre-scale circulations that intensified the advective supply of iron to HNLC waters. The simulated primary and export production in the 2090s decreased globally by 6 and 13%, respectively, whereas in the HNLC regions, they increased by 11 and 6%, respectively. Roughly half of the elevated production could be attributed to the intensified iron supply. The projected ocean circulation and mixing changes are consistent with recent observations of responses to the warming climate and with other Coupled Model Intercomparison Project model projections. We conclude that future ocean circulation has the potential to increase iron supply to HNLC waters and will potentially buffer future reductions in ocean productivity. Article in Journal/Newspaper Southern Ocean University of California: eScholarship Indian Pacific Southern Ocean Biogeosciences 11 1 33 55 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics equatorial pacific-ocean dissolved iron southern-ocean mineral dust organic-matter indian-ocean global ocean arabian sea carbon biogeochemistry |
spellingShingle |
Physical Sciences and Mathematics equatorial pacific-ocean dissolved iron southern-ocean mineral dust organic-matter indian-ocean global ocean arabian sea carbon biogeochemistry Misumi, K. Lindsay, K. Moore, J. K Doney, S. C Bryan, F. O Tsumune, D. Yoshida, Y. The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
topic_facet |
Physical Sciences and Mathematics equatorial pacific-ocean dissolved iron southern-ocean mineral dust organic-matter indian-ocean global ocean arabian sea carbon biogeochemistry |
description |
We investigated the simulated iron budget in ocean surface waters in the 1990s and 2090s using the Community Earth System Model version 1 and the Representative Concentration Pathway 8.5 future CO2 emission scenario. We assumed that exogenous iron inputs did not change during the whole simulation period; thus, iron budget changes were attributed solely to changes in ocean circulation and mixing in response to projected global warming, and the resulting impacts on marine biogeochemistry. The model simulated the major features of ocean circulation and dissolved iron distribution for the present climate. Detailed iron budget analysis revealed that roughly 70% of the iron supplied to surface waters in high-nutrient, low-chlorophyll (HNLC) regions is contributed by ocean circulation and mixing processes, but the dominant supply mechanism differed by region: upwelling in the eastern equatorial Pacific and vertical mixing in the Southern Ocean. For the 2090s, our model projected an increased iron supply to HNLC waters, even though enhanced stratification was predicted to reduce iron entrainment from deeper waters. This unexpected result is attributed largely to changes in gyre-scale circulations that intensified the advective supply of iron to HNLC waters. The simulated primary and export production in the 2090s decreased globally by 6 and 13%, respectively, whereas in the HNLC regions, they increased by 11 and 6%, respectively. Roughly half of the elevated production could be attributed to the intensified iron supply. The projected ocean circulation and mixing changes are consistent with recent observations of responses to the warming climate and with other Coupled Model Intercomparison Project model projections. We conclude that future ocean circulation has the potential to increase iron supply to HNLC waters and will potentially buffer future reductions in ocean productivity. |
format |
Article in Journal/Newspaper |
author |
Misumi, K. Lindsay, K. Moore, J. K Doney, S. C Bryan, F. O Tsumune, D. Yoshida, Y. |
author_facet |
Misumi, K. Lindsay, K. Moore, J. K Doney, S. C Bryan, F. O Tsumune, D. Yoshida, Y. |
author_sort |
Misumi, K. |
title |
The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
title_short |
The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
title_full |
The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
title_fullStr |
The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
title_full_unstemmed |
The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1 |
title_sort |
iron budget in ocean surface waters in the 20th and 21st centuries: projections by the community earth system model version 1 |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
http://www.escholarship.org/uc/item/9pv2q80s |
op_coverage |
33 - 55 |
geographic |
Indian Pacific Southern Ocean |
geographic_facet |
Indian Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Misumi, K.; Lindsay, K.; Moore, J. K; Doney, S. C; Bryan, F. O; Tsumune, D.; et al.(2014). The iron budget in ocean surface waters in the 20th and 21st centuries: projections by the Community Earth System Model version 1. Biogeosciences, 11(1), 33 - 55. doi:10.5194/bg-11-33-2014. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/9pv2q80s |
op_relation |
qt9pv2q80s http://www.escholarship.org/uc/item/9pv2q80s |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-11-33-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
55 |
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1766206575122317312 |