Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica
We report data from the first 8 years of oceanographic monitoring in Ryder Bay, northern Marguerite Bay, Antarctica. These data form the oceanographic component of the Rothera Oceanographic and Biological Time-Series (RaTS) project. When weather and ice permit, the RaTS station is occupied every 5 d...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Pergamon-Elsevier
2008
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Online Access: | http://nora.nerc.ac.uk/id/eprint/11430/ |
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ftnerc:oai:nora.nerc.ac.uk:11430 2023-05-15T13:45:10+02:00 Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica Clarke, Andrew Meredith, Michael P. Wallace, Margaret I. Brandon, Mark A. Thomas, David N. 2008 http://nora.nerc.ac.uk/id/eprint/11430/ unknown Pergamon-Elsevier Clarke, Andrew orcid:0000-0002-7582-3074 Meredith, Michael P. orcid:0000-0002-7342-7756 Wallace, Margaret I.; Brandon, Mark A.; Thomas, David N. 2008 Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica. Deep-Sea Research Part II, 55 (18-19). 1988-2006. https://doi.org/10.1016/j.dsr2.2008.04.035 <https://doi.org/10.1016/j.dsr2.2008.04.035> Marine Sciences Biology and Microbiology Ecology and Environment Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1016/j.dsr2.2008.04.035 2023-02-04T19:27:21Z We report data from the first 8 years of oceanographic monitoring in Ryder Bay, northern Marguerite Bay, Antarctica. These data form the oceanographic component of the Rothera Oceanographic and Biological Time-Series (RaTS) project. When weather and ice permit, the RaTS station is occupied every 5 days in summer and weekly in winter. Observations comprise a conductivity-temperature-depth (CTD) cast to 500 m and a water sample from 15 m, this being the depth of the chlorophyll maximum in most years. The water samples provide data on total chlorophyll (size-fractionated at 20, 5, 2 and 0.2 mu m), macronutrients (N, P and Si) and dissolved organic carbon (DOC). The CTD profiles reveal strong seasonality in the topmost Antarctic Surface Water (AASW) driven by summer solar heating and winter cooling with brine rejection during ice formation. The depth of the winter mixed layer reaches a maximum in August, with annual maximum values ranging from similar to 30 to > 140 m. Below the AASW is the relatively a seasonal Winter Water (WW), and the bottom of the profile indicates the presence of modified Upper Circumpolar Deep Water (UCDW). Summer chlorophyll typically exceeds 20 mg m(-3), with the peak in January. Vertical flux of phytodetritus is also predominantly in January. The summer bloom is dominated by large diatoms and colonial forms, whereas in winter most of the chlorophyll is in the nanophytoplankton (20-5 mu m) fraction. Macronutrients show marked seasonality with N:P covariation close to Redfield (similar to 15.3) and Si:N stoichiometry similar to 1.67. Summer DOC values show little seasonality and relatively high winter levels (>50 mu M). Surface waters also exhibit a marked interannual variability, with ENSO as an important driver at subdecadal scales. (C) 2008 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) Ryder Bay ENVELOPE(-68.333,-68.333,-67.567,-67.567) Deep Sea Research Part II: Topical Studies in Oceanography 55 18-19 1988 2006 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Biology and Microbiology Ecology and Environment |
spellingShingle |
Marine Sciences Biology and Microbiology Ecology and Environment Clarke, Andrew Meredith, Michael P. Wallace, Margaret I. Brandon, Mark A. Thomas, David N. Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
topic_facet |
Marine Sciences Biology and Microbiology Ecology and Environment |
description |
We report data from the first 8 years of oceanographic monitoring in Ryder Bay, northern Marguerite Bay, Antarctica. These data form the oceanographic component of the Rothera Oceanographic and Biological Time-Series (RaTS) project. When weather and ice permit, the RaTS station is occupied every 5 days in summer and weekly in winter. Observations comprise a conductivity-temperature-depth (CTD) cast to 500 m and a water sample from 15 m, this being the depth of the chlorophyll maximum in most years. The water samples provide data on total chlorophyll (size-fractionated at 20, 5, 2 and 0.2 mu m), macronutrients (N, P and Si) and dissolved organic carbon (DOC). The CTD profiles reveal strong seasonality in the topmost Antarctic Surface Water (AASW) driven by summer solar heating and winter cooling with brine rejection during ice formation. The depth of the winter mixed layer reaches a maximum in August, with annual maximum values ranging from similar to 30 to > 140 m. Below the AASW is the relatively a seasonal Winter Water (WW), and the bottom of the profile indicates the presence of modified Upper Circumpolar Deep Water (UCDW). Summer chlorophyll typically exceeds 20 mg m(-3), with the peak in January. Vertical flux of phytodetritus is also predominantly in January. The summer bloom is dominated by large diatoms and colonial forms, whereas in winter most of the chlorophyll is in the nanophytoplankton (20-5 mu m) fraction. Macronutrients show marked seasonality with N:P covariation close to Redfield (similar to 15.3) and Si:N stoichiometry similar to 1.67. Summer DOC values show little seasonality and relatively high winter levels (>50 mu M). Surface waters also exhibit a marked interannual variability, with ENSO as an important driver at subdecadal scales. (C) 2008 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Clarke, Andrew Meredith, Michael P. Wallace, Margaret I. Brandon, Mark A. Thomas, David N. |
author_facet |
Clarke, Andrew Meredith, Michael P. Wallace, Margaret I. Brandon, Mark A. Thomas, David N. |
author_sort |
Clarke, Andrew |
title |
Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
title_short |
Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
title_full |
Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
title_fullStr |
Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
title_full_unstemmed |
Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica |
title_sort |
seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern marguerite bay, antarctica |
publisher |
Pergamon-Elsevier |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/11430/ |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-68.333,-68.333,-67.566,-67.566) ENVELOPE(-68.333,-68.333,-67.567,-67.567) |
geographic |
Antarctic Marguerite Marguerite Bay Rothera Ryder Ryder Bay |
geographic_facet |
Antarctic Marguerite Marguerite Bay Rothera Ryder Ryder Bay |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
Clarke, Andrew orcid:0000-0002-7582-3074 Meredith, Michael P. orcid:0000-0002-7342-7756 Wallace, Margaret I.; Brandon, Mark A.; Thomas, David N. 2008 Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica. Deep-Sea Research Part II, 55 (18-19). 1988-2006. https://doi.org/10.1016/j.dsr2.2008.04.035 <https://doi.org/10.1016/j.dsr2.2008.04.035> |
op_doi |
https://doi.org/10.1016/j.dsr2.2008.04.035 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
18-19 |
container_start_page |
1988 |
op_container_end_page |
2006 |
_version_ |
1766214559441354752 |