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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ftopenunivgb:oai:oro.open.ac.uk:12086 2024-06-23T07:46:57+00:00 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. 2008-10 https://oro.open.ac.uk/12086/ unknown Clarke, Andrew; Meredith, Michael P.; Wallace, Margaret I.; Brandon, Mark A. <https://oro.open.ac.uk/view/person/mab49.html> and Thomas, David N. (2008). Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica. Deep-Sea Research Part II: Topical Studies in Oceanography, 55(18-19) pp. 1988–2006. Journal Item PeerReviewed 2008 ftopenunivgb 2024-06-05T00:41:20Z 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 500m 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 µm), 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 ~30 to >140m. Below the AASW is the relatively aseasonal Winter Water (WW), and the bottom of the profile indicates the presence of modified Upper Circumpolar Deep Water (UCDW). Summer chlorophyll typically exceeds 20mg 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 μm) fraction. Macronutrients show marked seasonality with N:P covariation close to Redfield (~15.3) and Si:N stoichiometry ~1.67. Summer DOC values show little seasonality and relatively high winter levels (>50 µM). Surface waters also exhibit a marked interannual variability, with ENSO as an important driver at subdecadal scales. Article in Journal/Newspaper Antarc* Antarctic Antarctica The Open University: Open Research Online (ORO) Antarctic Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) 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 |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
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 500m 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 µm), 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 ~30 to >140m. Below the AASW is the relatively aseasonal Winter Water (WW), and the bottom of the profile indicates the presence of modified Upper Circumpolar Deep Water (UCDW). Summer chlorophyll typically exceeds 20mg 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 μm) fraction. Macronutrients show marked seasonality with N:P covariation close to Redfield (~15.3) and Si:N stoichiometry ~1.67. Summer DOC values show little seasonality and relatively high winter levels (>50 µM). Surface waters also exhibit a marked interannual variability, with ENSO as an important driver at subdecadal scales. |
format |
Article in Journal/Newspaper |
author |
Clarke, Andrew Meredith, Michael P. Wallace, Margaret I. Brandon, Mark A. Thomas, David N. |
spellingShingle |
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 |
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 |
publishDate |
2008 |
url |
https://oro.open.ac.uk/12086/ |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-68.333,-68.333,-67.566,-67.566) ENVELOPE(-68.333,-68.333,-67.567,-67.567) |
geographic |
Antarctic Marguerite Rothera Marguerite Bay Ryder Ryder Bay |
geographic_facet |
Antarctic Marguerite Rothera Marguerite Bay Ryder Ryder Bay |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
Clarke, Andrew; Meredith, Michael P.; Wallace, Margaret I.; Brandon, Mark A. <https://oro.open.ac.uk/view/person/mab49.html> and Thomas, David N. (2008). Seasonal and interannual variability in temperature, chlorophyll and macronutrients in northern Marguerite Bay, Antarctica. Deep-Sea Research Part II: Topical Studies in Oceanography, 55(18-19) pp. 1988–2006. |
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_ |
1802649482185146368 |