Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean
Chlorophyll a and nutrient concentrations along with temperature and salinity values were measured at 22 CTD stations along a 735-km transect running to the northwest of the island of South Georgia, Southern Ocean. Measurements were repeated during five summer surveys (January and February 1994, Jan...
Published in: | Polar Biology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Springer
2000
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/502607/ https://doi.org/10.1007/s003000050458 |
id |
ftnerc:oai:nora.nerc.ac.uk:502607 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:502607 2023-05-15T13:48:07+02:00 Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean Whitehouse, M. J. Priddle, J. Brandon, M. A. 2000 http://nora.nerc.ac.uk/id/eprint/502607/ https://doi.org/10.1007/s003000050458 unknown Springer Whitehouse, M. J.; Priddle, J.; Brandon, M. A. 2000 Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean. Polar Biology, 23 (6). 373-382. https://doi.org/10.1007/s003000050458 <https://doi.org/10.1007/s003000050458> Marine Sciences Chemistry Publication - Article PeerReviewed 2000 ftnerc https://doi.org/10.1007/s003000050458 2023-02-04T19:37:21Z Chlorophyll a and nutrient concentrations along with temperature and salinity values were measured at 22 CTD stations along a 735-km transect running to the northwest of the island of South Georgia, Southern Ocean. Measurements were repeated during five summer surveys (January and February 1994, January 1996, December 1996, January 1998) and one spring survey (October 1997). The transect sampled Sub-Antarctic Zone water in the north, Polar Frontal Zone water and Antarctic Zone water in the south. Chlorophyll a concentrations were lowest to the north of the transect and frequently high (up to 17 mg m−3) in the deep open ocean of the Antarctic Zone. Sub-surface peaks were measured in all zones and chlorophyll a was detectable to a depth of 150 m. There was a clear latitudinal temperature gradient in the near-surface waters (0–50 m), the warmest water occurring in the north (∼12 °C), and the coolest in the Antarctic Zone (∼2 °C). There was also a well-defined latitudinal gradient in summer near-surface silicate concentrations (∼2, 4, and 10 mmol m−3 in the Sub-Antarctic Zone, the Polar Frontal Zone and the Antarctic Zone, respectively), increasing to >20 mmol m−3 near South Georgia. Distinct differences in silicate concentrations were also evident in all three zones to a depth of 500 m. Near-surface nitrate and phosphate concentrations were relatively low to the north of the transect (∼14 and 1 mmol m−3, respectively) and higher in the Polar Frontal Zone and Antarctic Zone (∼18 and 1.4 mmol m−3, respectively). Ammonium and nitrite were restricted to the upper 200 m of the water column, and exhibited sub-surface concentration peaks, the lowest being in the Sub-Antarctic Zone (0.68 and 0.25 mmol m−3, respectively) and the highest in the Antarctic Zone (1.72 and 0.29 mmol m−3, respectively). Surface (∼6 m) spring nutrient measurements provided an indication of pre-bloom conditions; ammonium and nitrite concentrations were low (∼0.27 and 0.28 mmol m−3, respectively), while silicate, nitrate and phosphate ... Article in Journal/Newspaper Antarc* Antarctic Polar Biology Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Polar Biology 23 6 373 382 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Chemistry |
spellingShingle |
Marine Sciences Chemistry Whitehouse, M. J. Priddle, J. Brandon, M. A. Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
topic_facet |
Marine Sciences Chemistry |
description |
Chlorophyll a and nutrient concentrations along with temperature and salinity values were measured at 22 CTD stations along a 735-km transect running to the northwest of the island of South Georgia, Southern Ocean. Measurements were repeated during five summer surveys (January and February 1994, January 1996, December 1996, January 1998) and one spring survey (October 1997). The transect sampled Sub-Antarctic Zone water in the north, Polar Frontal Zone water and Antarctic Zone water in the south. Chlorophyll a concentrations were lowest to the north of the transect and frequently high (up to 17 mg m−3) in the deep open ocean of the Antarctic Zone. Sub-surface peaks were measured in all zones and chlorophyll a was detectable to a depth of 150 m. There was a clear latitudinal temperature gradient in the near-surface waters (0–50 m), the warmest water occurring in the north (∼12 °C), and the coolest in the Antarctic Zone (∼2 °C). There was also a well-defined latitudinal gradient in summer near-surface silicate concentrations (∼2, 4, and 10 mmol m−3 in the Sub-Antarctic Zone, the Polar Frontal Zone and the Antarctic Zone, respectively), increasing to >20 mmol m−3 near South Georgia. Distinct differences in silicate concentrations were also evident in all three zones to a depth of 500 m. Near-surface nitrate and phosphate concentrations were relatively low to the north of the transect (∼14 and 1 mmol m−3, respectively) and higher in the Polar Frontal Zone and Antarctic Zone (∼18 and 1.4 mmol m−3, respectively). Ammonium and nitrite were restricted to the upper 200 m of the water column, and exhibited sub-surface concentration peaks, the lowest being in the Sub-Antarctic Zone (0.68 and 0.25 mmol m−3, respectively) and the highest in the Antarctic Zone (1.72 and 0.29 mmol m−3, respectively). Surface (∼6 m) spring nutrient measurements provided an indication of pre-bloom conditions; ammonium and nitrite concentrations were low (∼0.27 and 0.28 mmol m−3, respectively), while silicate, nitrate and phosphate ... |
format |
Article in Journal/Newspaper |
author |
Whitehouse, M. J. Priddle, J. Brandon, M. A. |
author_facet |
Whitehouse, M. J. Priddle, J. Brandon, M. A. |
author_sort |
Whitehouse, M. J. |
title |
Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
title_short |
Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
title_full |
Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
title_fullStr |
Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
title_full_unstemmed |
Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean |
title_sort |
chlorophyll/nutrient characteristics in the water masses to the north of south georgia, southern ocean |
publisher |
Springer |
publishDate |
2000 |
url |
http://nora.nerc.ac.uk/id/eprint/502607/ https://doi.org/10.1007/s003000050458 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Polar Biology Southern Ocean |
genre_facet |
Antarc* Antarctic Polar Biology Southern Ocean |
op_relation |
Whitehouse, M. J.; Priddle, J.; Brandon, M. A. 2000 Chlorophyll/nutrient characteristics in the water masses to the north of South Georgia, Southern Ocean. Polar Biology, 23 (6). 373-382. https://doi.org/10.1007/s003000050458 <https://doi.org/10.1007/s003000050458> |
op_doi |
https://doi.org/10.1007/s003000050458 |
container_title |
Polar Biology |
container_volume |
23 |
container_issue |
6 |
container_start_page |
373 |
op_container_end_page |
382 |
_version_ |
1766248661742780416 |