Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica
Two small-scale Antarctic marine ecosystem surveys were conducted offshore from the Mawson coast (6166 degrees E), in the austral summers of January 2001 and 2003. Striking differences were observed in the state of the marine ecosystem between the surveys; in particular krill abundance and penguin b...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://doi.org/10.1016/j.dsr2.2007.11.007 http://ecite.utas.edu.au/71383 |
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ftunivtasecite:oai:ecite.utas.edu.au:71383 2023-05-15T14:02:30+02:00 Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica Williams, GD Nicol, S Raymond, B Meiners, K 2008 https://doi.org/10.1016/j.dsr2.2007.11.007 http://ecite.utas.edu.au/71383 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2007.11.007 Williams, GD and Nicol, S and Raymond, B and Meiners, K, Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 55, (3-4) pp. 365-376. ISSN 0967-0645 (2008) [Refereed Article] http://ecite.utas.edu.au/71383 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1016/j.dsr2.2007.11.007 2019-12-13T21:38:51Z Two small-scale Antarctic marine ecosystem surveys were conducted offshore from the Mawson coast (6166 degrees E), in the austral summers of January 2001 and 2003. Striking differences were observed in the state of the marine ecosystem between the surveys; in particular krill abundance and penguin breeding success were significantly lower in 2003. In this paper we examine the variability in the physical oceanography between the two surveys, and identify the development of the summer mixed layer (SML) as the key physical process influencing the differences in ecological conditions. The mixed layer in 2003 was warmer, fresher and reduced in both dissolved oxygen content and fluorescence relative to 2001. In 2001 the mean mixed-layer depth was 68.5 +/- 12.4m. In 2003, the mean mixed-layer depth was 33.8+/- 11.2m, and increased through the remaining 14 days of the survey. The SML in 2003 was underdeveloped by over a month relative to the 2001 hydrography and we relate this to the seasonal variability in the pattern and timing of sea-ice melt. AVHRR satellite images show a region of fast ice against the Mawson coast that had greater spatial and temporal extent in 2003. We conclude that delayed mixed layer development due to persistent sea ice is likely to have a negative impact on the marine ecosystem of the Antarctic shelf. This may have important implications for predicting the impact of future variability in the sea-ice growth/melt transition due to climate change. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice eCite UTAS (University of Tasmania) Antarctic Austral East Antarctica Mawson Coast ENVELOPE(63.000,63.000,-68.000,-68.000) The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 55 3-4 365 376 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Williams, GD Nicol, S Raymond, B Meiners, K Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Two small-scale Antarctic marine ecosystem surveys were conducted offshore from the Mawson coast (6166 degrees E), in the austral summers of January 2001 and 2003. Striking differences were observed in the state of the marine ecosystem between the surveys; in particular krill abundance and penguin breeding success were significantly lower in 2003. In this paper we examine the variability in the physical oceanography between the two surveys, and identify the development of the summer mixed layer (SML) as the key physical process influencing the differences in ecological conditions. The mixed layer in 2003 was warmer, fresher and reduced in both dissolved oxygen content and fluorescence relative to 2001. In 2001 the mean mixed-layer depth was 68.5 +/- 12.4m. In 2003, the mean mixed-layer depth was 33.8+/- 11.2m, and increased through the remaining 14 days of the survey. The SML in 2003 was underdeveloped by over a month relative to the 2001 hydrography and we relate this to the seasonal variability in the pattern and timing of sea-ice melt. AVHRR satellite images show a region of fast ice against the Mawson coast that had greater spatial and temporal extent in 2003. We conclude that delayed mixed layer development due to persistent sea ice is likely to have a negative impact on the marine ecosystem of the Antarctic shelf. This may have important implications for predicting the impact of future variability in the sea-ice growth/melt transition due to climate change. |
format |
Article in Journal/Newspaper |
author |
Williams, GD Nicol, S Raymond, B Meiners, K |
author_facet |
Williams, GD Nicol, S Raymond, B Meiners, K |
author_sort |
Williams, GD |
title |
Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
title_short |
Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
title_full |
Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
title_fullStr |
Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
title_full_unstemmed |
Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica |
title_sort |
summertime mixed layer development in the marginal sea ice zone off the mawson coast, east antarctica |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2008 |
url |
https://doi.org/10.1016/j.dsr2.2007.11.007 http://ecite.utas.edu.au/71383 |
long_lat |
ENVELOPE(63.000,63.000,-68.000,-68.000) |
geographic |
Antarctic Austral East Antarctica Mawson Coast The Antarctic |
geographic_facet |
Antarctic Austral East Antarctica Mawson Coast The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2007.11.007 Williams, GD and Nicol, S and Raymond, B and Meiners, K, Summertime mixed layer development in the marginal sea ice zone off the Mawson coast, East Antarctica, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 55, (3-4) pp. 365-376. ISSN 0967-0645 (2008) [Refereed Article] http://ecite.utas.edu.au/71383 |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.11.007 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
3-4 |
container_start_page |
365 |
op_container_end_page |
376 |
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1766272770335834112 |