Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands
The oxygen and hydrogen isotope composition of waters in a small valley at Signy Island, South Orkney Islands, were monitored over three summers (1999 to 2001). These stable isotopes track water movement through the catchment, especially seasonal precipitation and snow melt. All samples fall close t...
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Online Access: | http://dx.doi.org/10.1017/s0954102002000159 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000159 |
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crcambridgeupr:10.1017/s0954102002000159 2024-03-17T08:54:51+00:00 Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands NOON, PHILIPPA E. LENG, M.J. ARROWSMITH, C. EDWORTHY, M.G. STRACHAN, R.J. 2002 http://dx.doi.org/10.1017/s0954102002000159 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000159 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 14, issue 4, page 333-342 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2002 crcambridgeupr https://doi.org/10.1017/s0954102002000159 2024-02-20T00:03:39Z The oxygen and hydrogen isotope composition of waters in a small valley at Signy Island, South Orkney Islands, were monitored over three summers (1999 to 2001). These stable isotopes track water movement through the catchment, especially seasonal precipitation and snow melt. All samples fall close to the regional meteoric water line but factors other than air temperature cause year-to-year variability. Residence times are in the order of days thus the lake water provides an average of precipitation falling only a few days before, except in the winter when the lakes are effectively closed. Freezing of surface waters preserves the isotope signature of the underlying waters from the previous summer. In spring, meltwaters from winter snow are isotopically depleted having δ 18 O and δD as low as -13‰ and -100‰ (VSMOW). Ice- cover break-up in late December allows complete water column mixing. By February, the lakes are relatively enriched isotopically (δ 18 O -9‰) by summer precipitation. Precipitation isotopic composition at Halley Station, Brunt Ice Shelf, is similar, illustrating the broad-scale effects of the Weddell Sea cyclonic atmospheric circulation. These data form a useful reference data-set for the ground-based validation of atmospheric models and palaeoclimate reconstructions in this isolated sector of the South Atlantic Ocean. Article in Journal/Newspaper Antarctic Science Brunt Ice Shelf Ice Shelf Signy Island South Atlantic Ocean South Orkney Islands Weddell Sea Cambridge University Press Weddell Sea Weddell South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Halley Station ENVELOPE(-26.541,-26.541,-75.581,-75.581) Brunt Ice Shelf ENVELOPE(-22.500,-22.500,-74.750,-74.750) Antarctic Science 14 4 333 342 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography NOON, PHILIPPA E. LENG, M.J. ARROWSMITH, C. EDWORTHY, M.G. STRACHAN, R.J. Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
The oxygen and hydrogen isotope composition of waters in a small valley at Signy Island, South Orkney Islands, were monitored over three summers (1999 to 2001). These stable isotopes track water movement through the catchment, especially seasonal precipitation and snow melt. All samples fall close to the regional meteoric water line but factors other than air temperature cause year-to-year variability. Residence times are in the order of days thus the lake water provides an average of precipitation falling only a few days before, except in the winter when the lakes are effectively closed. Freezing of surface waters preserves the isotope signature of the underlying waters from the previous summer. In spring, meltwaters from winter snow are isotopically depleted having δ 18 O and δD as low as -13‰ and -100‰ (VSMOW). Ice- cover break-up in late December allows complete water column mixing. By February, the lakes are relatively enriched isotopically (δ 18 O -9‰) by summer precipitation. Precipitation isotopic composition at Halley Station, Brunt Ice Shelf, is similar, illustrating the broad-scale effects of the Weddell Sea cyclonic atmospheric circulation. These data form a useful reference data-set for the ground-based validation of atmospheric models and palaeoclimate reconstructions in this isolated sector of the South Atlantic Ocean. |
format |
Article in Journal/Newspaper |
author |
NOON, PHILIPPA E. LENG, M.J. ARROWSMITH, C. EDWORTHY, M.G. STRACHAN, R.J. |
author_facet |
NOON, PHILIPPA E. LENG, M.J. ARROWSMITH, C. EDWORTHY, M.G. STRACHAN, R.J. |
author_sort |
NOON, PHILIPPA E. |
title |
Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
title_short |
Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
title_full |
Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
title_fullStr |
Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
title_full_unstemmed |
Seasonal observations of stable isotope variations in a valley catchment, Signy Island, South Orkney Islands |
title_sort |
seasonal observations of stable isotope variations in a valley catchment, signy island, south orkney islands |
publisher |
Cambridge University Press (CUP) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1017/s0954102002000159 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000159 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-26.541,-26.541,-75.581,-75.581) ENVELOPE(-22.500,-22.500,-74.750,-74.750) |
geographic |
Weddell Sea Weddell South Orkney Islands Signy Island Halley Station Brunt Ice Shelf |
geographic_facet |
Weddell Sea Weddell South Orkney Islands Signy Island Halley Station Brunt Ice Shelf |
genre |
Antarctic Science Brunt Ice Shelf Ice Shelf Signy Island South Atlantic Ocean South Orkney Islands Weddell Sea |
genre_facet |
Antarctic Science Brunt Ice Shelf Ice Shelf Signy Island South Atlantic Ocean South Orkney Islands Weddell Sea |
op_source |
Antarctic Science volume 14, issue 4, page 333-342 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102002000159 |
container_title |
Antarctic Science |
container_volume |
14 |
container_issue |
4 |
container_start_page |
333 |
op_container_end_page |
342 |
_version_ |
1793773374045945856 |