Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current
The Antarctic Circumpolar Current (ACC) has highly energetic mesoscale phenomena, but their impacts on phytoplankton biomass, productivity, and biogeochemical cycling are not understood well. We analyze satellite observations and an eddy‐rich ocean model to show that they drive chlorophyll anomalies...
Published in: | Geophysical Research Letters |
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Language: | English |
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AGU (American Geophysical Union)
2018
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Online Access: | https://oceanrep.geomar.de/id/eprint/43177/ https://oceanrep.geomar.de/id/eprint/43177/1/2018_song_grl_accepted.pdf https://oceanrep.geomar.de/id/eprint/43177/7/Song_et_al-2018-Geophysical_Research_Letters.pdf https://doi.org/10.1029/2017GL076246 |
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ftoceanrep:oai:oceanrep.geomar.de:43177 2023-05-15T14:02:07+02:00 Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current Song, Hajoon Long, Matthew C. Gaube, Peter Frenger, Ivy Marshall, John McGillicuddy Jr., Dennis J. 2018-05-28 text https://oceanrep.geomar.de/id/eprint/43177/ https://oceanrep.geomar.de/id/eprint/43177/1/2018_song_grl_accepted.pdf https://oceanrep.geomar.de/id/eprint/43177/7/Song_et_al-2018-Geophysical_Research_Letters.pdf https://doi.org/10.1029/2017GL076246 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/43177/1/2018_song_grl_accepted.pdf https://oceanrep.geomar.de/id/eprint/43177/7/Song_et_al-2018-Geophysical_Research_Letters.pdf Song, H., Long, M. C., Gaube, P., Frenger, I. , Marshall, J. and McGillicuddy Jr., D. J. (2018) Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current. Open Access Geophysical Research Letters, 45 (10). pp. 5011-5019. DOI 10.1029/2017GL076246 <https://doi.org/10.1029/2017GL076246>. doi:10.1029/2017GL076246 info:eu-repo/semantics/openAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.1029/2017GL076246 2023-04-07T15:40:01Z The Antarctic Circumpolar Current (ACC) has highly energetic mesoscale phenomena, but their impacts on phytoplankton biomass, productivity, and biogeochemical cycling are not understood well. We analyze satellite observations and an eddy‐rich ocean model to show that they drive chlorophyll anomalies of opposite sign in winter versus summer. In winter, deeper mixed layers in positive sea surface height (SSH) anomalies reduce light availability, leading to anomalously low chlorophyll concentrations. In summer with abundant light, however, positive SSH anomalies show elevated chlorophyll concentration due to higher iron level, and an iron budget analysis reveals that anomalously strong vertical mixing enhances iron supply to the mixed layer. Features with negative SSH anomalies exhibit the opposite tendencies: higher chlorophyll concentration in winter and lower in summer. Our results suggest that mesoscale modulation of iron supply, light availability and vertical mixing plays an important role in causing systematic variations in primary productivity over the seasonal cycle. Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Geophysical Research Letters 45 10 5011 5019 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Antarctic Circumpolar Current (ACC) has highly energetic mesoscale phenomena, but their impacts on phytoplankton biomass, productivity, and biogeochemical cycling are not understood well. We analyze satellite observations and an eddy‐rich ocean model to show that they drive chlorophyll anomalies of opposite sign in winter versus summer. In winter, deeper mixed layers in positive sea surface height (SSH) anomalies reduce light availability, leading to anomalously low chlorophyll concentrations. In summer with abundant light, however, positive SSH anomalies show elevated chlorophyll concentration due to higher iron level, and an iron budget analysis reveals that anomalously strong vertical mixing enhances iron supply to the mixed layer. Features with negative SSH anomalies exhibit the opposite tendencies: higher chlorophyll concentration in winter and lower in summer. Our results suggest that mesoscale modulation of iron supply, light availability and vertical mixing plays an important role in causing systematic variations in primary productivity over the seasonal cycle. |
format |
Article in Journal/Newspaper |
author |
Song, Hajoon Long, Matthew C. Gaube, Peter Frenger, Ivy Marshall, John McGillicuddy Jr., Dennis J. |
spellingShingle |
Song, Hajoon Long, Matthew C. Gaube, Peter Frenger, Ivy Marshall, John McGillicuddy Jr., Dennis J. Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
author_facet |
Song, Hajoon Long, Matthew C. Gaube, Peter Frenger, Ivy Marshall, John McGillicuddy Jr., Dennis J. |
author_sort |
Song, Hajoon |
title |
Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
title_short |
Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
title_full |
Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
title_fullStr |
Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
title_full_unstemmed |
Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current |
title_sort |
seasonal variation in the correlation between anomalies of sea level and chlorophyll in the antarctic circumpolar current |
publisher |
AGU (American Geophysical Union) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/43177/ https://oceanrep.geomar.de/id/eprint/43177/1/2018_song_grl_accepted.pdf https://oceanrep.geomar.de/id/eprint/43177/7/Song_et_al-2018-Geophysical_Research_Letters.pdf https://doi.org/10.1029/2017GL076246 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/43177/1/2018_song_grl_accepted.pdf https://oceanrep.geomar.de/id/eprint/43177/7/Song_et_al-2018-Geophysical_Research_Letters.pdf Song, H., Long, M. C., Gaube, P., Frenger, I. , Marshall, J. and McGillicuddy Jr., D. J. (2018) Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current. Open Access Geophysical Research Letters, 45 (10). pp. 5011-5019. DOI 10.1029/2017GL076246 <https://doi.org/10.1029/2017GL076246>. doi:10.1029/2017GL076246 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2017GL076246 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
10 |
container_start_page |
5011 |
op_container_end_page |
5019 |
_version_ |
1766272197799706624 |