Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean
The ratio between fluorescence (F) and chlorophyll-a (Chl)where fluorescence is measured with a saturating fluorometeris variable in the world's oceans, with the highest ratios and highest variability observed in the Southern Ocean. While species composition and Chl packaging per cell are stron...
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Online Access: | https://doi.org/10.1029/2021GL097616 http://ecite.utas.edu.au/150899 |
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ftunivtasecite:oai:ecite.utas.edu.au:150899 2023-05-15T18:24:05+02:00 Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean Schallenberg, C Strzepek, RF Bestley, S Wojtasiewicz, B Trull, TW 2022 application/pdf https://doi.org/10.1029/2021GL097616 http://ecite.utas.edu.au/150899 en eng Amer Geophysical Union http://ecite.utas.edu.au/150899/1/150899 - Iron limitation drives the globally extreme fluorescence.pdf http://dx.doi.org/10.1029/2021GL097616 Schallenberg, C and Strzepek, RF and Bestley, S and Wojtasiewicz, B and Trull, TW, Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean, Geophysical Research Letters, 49, (12) Article e2021GL097616. ISSN 0094-8276 (2022) [Refereed Article] http://ecite.utas.edu.au/150899 Earth Sciences Oceanography Biological oceanography Refereed Article PeerReviewed 2022 ftunivtasecite https://doi.org/10.1029/2021GL097616 2022-11-14T23:17:15Z The ratio between fluorescence (F) and chlorophyll-a (Chl)where fluorescence is measured with a saturating fluorometeris variable in the world's oceans, with the highest ratios and highest variability observed in the Southern Ocean. While species composition and Chl packaging per cell are strong drivers for the observed variability, additional factors, including iron limitation, have to this date not specifically been evaluated. Radiometers on biogeochemical (BGC)-Argo floats allow for an independent estimate of Chl concentration that is based on the light attenuation coefficient, K d . Making use of 4,000 radiometry profiles from BGC-Argo floats in the Southern Ocean, we estimate Chl based on K d and investigate the variability in F/Chl. Our analysis reveals a positive correlation between F/Chl and a proxy for iron limitation based on non-photochemical quenching dynamics. The strong influence of iron limitation on F/Chl is further corroborated by data from Southern Ocean phytoplankton cultures. Article in Journal/Newspaper Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Geophysical Research Letters 49 12 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological oceanography |
spellingShingle |
Earth Sciences Oceanography Biological oceanography Schallenberg, C Strzepek, RF Bestley, S Wojtasiewicz, B Trull, TW Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
topic_facet |
Earth Sciences Oceanography Biological oceanography |
description |
The ratio between fluorescence (F) and chlorophyll-a (Chl)where fluorescence is measured with a saturating fluorometeris variable in the world's oceans, with the highest ratios and highest variability observed in the Southern Ocean. While species composition and Chl packaging per cell are strong drivers for the observed variability, additional factors, including iron limitation, have to this date not specifically been evaluated. Radiometers on biogeochemical (BGC)-Argo floats allow for an independent estimate of Chl concentration that is based on the light attenuation coefficient, K d . Making use of 4,000 radiometry profiles from BGC-Argo floats in the Southern Ocean, we estimate Chl based on K d and investigate the variability in F/Chl. Our analysis reveals a positive correlation between F/Chl and a proxy for iron limitation based on non-photochemical quenching dynamics. The strong influence of iron limitation on F/Chl is further corroborated by data from Southern Ocean phytoplankton cultures. |
format |
Article in Journal/Newspaper |
author |
Schallenberg, C Strzepek, RF Bestley, S Wojtasiewicz, B Trull, TW |
author_facet |
Schallenberg, C Strzepek, RF Bestley, S Wojtasiewicz, B Trull, TW |
author_sort |
Schallenberg, C |
title |
Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
title_short |
Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
title_full |
Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
title_fullStr |
Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
title_full_unstemmed |
Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean |
title_sort |
iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the southern ocean |
publisher |
Amer Geophysical Union |
publishDate |
2022 |
url |
https://doi.org/10.1029/2021GL097616 http://ecite.utas.edu.au/150899 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://ecite.utas.edu.au/150899/1/150899 - Iron limitation drives the globally extreme fluorescence.pdf http://dx.doi.org/10.1029/2021GL097616 Schallenberg, C and Strzepek, RF and Bestley, S and Wojtasiewicz, B and Trull, TW, Iron limitation drives the globally extreme fluorescence/chlorophyll ratios of the Southern Ocean, Geophysical Research Letters, 49, (12) Article e2021GL097616. ISSN 0094-8276 (2022) [Refereed Article] http://ecite.utas.edu.au/150899 |
op_doi |
https://doi.org/10.1029/2021GL097616 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
12 |
_version_ |
1766204371622690816 |