Impact of icebergs on net primary productivity in the Southern Ocean
Productivity in the Southern Ocean (SO) is iron-limited, and supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine environment. However, recent studies show that icebergs could provide a comparable amount of bioavailable iron to the SO as aeolian dust....
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Copernicus Publications
2017
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Online Access: | https://doi.org/10.5194/tc-11-707-2017 http://www.the-cryosphere.net/11/707/2017/tc-11-707-2017.pdf https://doaj.org/article/d06bf04244d949239600673e10441aa0 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:d06bf04244d949239600673e10441aa0 2023-05-15T13:32:52+02:00 Impact of icebergs on net primary productivity in the Southern Ocean S.-Y. Wu S. Hou 2017-03-01 https://doi.org/10.5194/tc-11-707-2017 http://www.the-cryosphere.net/11/707/2017/tc-11-707-2017.pdf https://doaj.org/article/d06bf04244d949239600673e10441aa0 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-11-707-2017 http://www.the-cryosphere.net/11/707/2017/tc-11-707-2017.pdf https://doaj.org/article/d06bf04244d949239600673e10441aa0 undefined The Cryosphere, Vol 11, Iss 2, Pp 707-722 (2017) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/tc-11-707-2017 2023-01-22T17:50:56Z Productivity in the Southern Ocean (SO) is iron-limited, and supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine environment. However, recent studies show that icebergs could provide a comparable amount of bioavailable iron to the SO as aeolian dust. In addition, small-scale areal studies suggest increased concentrations of chlorophyll, krill, and seabirds surrounding icebergs. Based on previous research, this study aims to examine whether iceberg occurrence has a significant impact on marine productivity at the scale of the SO, using remote sensing data of iceberg occurrences and ocean net primary productivity (NPP) covering the period 2002–2014. The impacts of both large and small icebergs are examined in four major ecological zones of the SO: the continental shelf zone (CSZ), the seasonal ice zone (SIZ), the permanent open ocean zone (POOZ), and the polar front zone (PFZ). We found that the presence of icebergs is associated with elevated levels of NPP, but the differences vary in different zones. Grid cells with small icebergs on average have higher NPP than other cells in most iron-deficient zones: 21 % higher for the SIZ, 16 % for the POOZ, and 12 % for the PFZ. The difference is relatively small in the CSZ where iron is supplied from meltwater and sediment input from the continent. In addition, NPP of grid cells adjacent to large icebergs on average is 10 % higher than that of control cells in the vicinity. The difference is larger at higher latitudes, where most large icebergs are concentrated. From 1992 to 2014, there is a significant increasing trend for both small and large icebergs. The increase was most rapid in the early 2000s and has leveled off since then. As the climate continues to warm, the Antarctic Ice Sheet is expected to experience increased mass loss as a whole, which could lead to more icebergs in the region. Based on our study, this could result in a higher level of NPP in the SO as a whole, providing a possible negative feedback for ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Iceberg* Southern Ocean The Cryosphere Unknown Antarctic Southern Ocean The Antarctic The Cryosphere 11 2 707 722 |
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envir geo S.-Y. Wu S. Hou Impact of icebergs on net primary productivity in the Southern Ocean |
topic_facet |
envir geo |
description |
Productivity in the Southern Ocean (SO) is iron-limited, and supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine environment. However, recent studies show that icebergs could provide a comparable amount of bioavailable iron to the SO as aeolian dust. In addition, small-scale areal studies suggest increased concentrations of chlorophyll, krill, and seabirds surrounding icebergs. Based on previous research, this study aims to examine whether iceberg occurrence has a significant impact on marine productivity at the scale of the SO, using remote sensing data of iceberg occurrences and ocean net primary productivity (NPP) covering the period 2002–2014. The impacts of both large and small icebergs are examined in four major ecological zones of the SO: the continental shelf zone (CSZ), the seasonal ice zone (SIZ), the permanent open ocean zone (POOZ), and the polar front zone (PFZ). We found that the presence of icebergs is associated with elevated levels of NPP, but the differences vary in different zones. Grid cells with small icebergs on average have higher NPP than other cells in most iron-deficient zones: 21 % higher for the SIZ, 16 % for the POOZ, and 12 % for the PFZ. The difference is relatively small in the CSZ where iron is supplied from meltwater and sediment input from the continent. In addition, NPP of grid cells adjacent to large icebergs on average is 10 % higher than that of control cells in the vicinity. The difference is larger at higher latitudes, where most large icebergs are concentrated. From 1992 to 2014, there is a significant increasing trend for both small and large icebergs. The increase was most rapid in the early 2000s and has leveled off since then. As the climate continues to warm, the Antarctic Ice Sheet is expected to experience increased mass loss as a whole, which could lead to more icebergs in the region. Based on our study, this could result in a higher level of NPP in the SO as a whole, providing a possible negative feedback for ... |
format |
Article in Journal/Newspaper |
author |
S.-Y. Wu S. Hou |
author_facet |
S.-Y. Wu S. Hou |
author_sort |
S.-Y. Wu |
title |
Impact of icebergs on net primary productivity in the Southern Ocean |
title_short |
Impact of icebergs on net primary productivity in the Southern Ocean |
title_full |
Impact of icebergs on net primary productivity in the Southern Ocean |
title_fullStr |
Impact of icebergs on net primary productivity in the Southern Ocean |
title_full_unstemmed |
Impact of icebergs on net primary productivity in the Southern Ocean |
title_sort |
impact of icebergs on net primary productivity in the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-707-2017 http://www.the-cryosphere.net/11/707/2017/tc-11-707-2017.pdf https://doaj.org/article/d06bf04244d949239600673e10441aa0 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Iceberg* Southern Ocean The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet Iceberg* Southern Ocean The Cryosphere |
op_source |
The Cryosphere, Vol 11, Iss 2, Pp 707-722 (2017) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-11-707-2017 http://www.the-cryosphere.net/11/707/2017/tc-11-707-2017.pdf https://doaj.org/article/d06bf04244d949239600673e10441aa0 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-11-707-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
2 |
container_start_page |
707 |
op_container_end_page |
722 |
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1766036661638004736 |