Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica
A record of Holocene hydrological changes has been produced from variations in oxygen-isotope composition (δ 18 O) preserved in freshwater lake sediments from maritime Antarctica. Small amounts (<5%) of authigenic carbonate have been extracted from a non-marl sediment core from Sombre Lake, Signy...
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Online Access: | http://dx.doi.org/10.1191/0959683603hl611rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl611rp |
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crsagepubl:10.1191/0959683603hl611rp 2024-04-07T07:48:10+00:00 Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica Noon, P. E. Leng, M. J. Jones, V. J. 2003 http://dx.doi.org/10.1191/0959683603hl611rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl611rp en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 13, issue 2, page 251-263 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2003 crsagepubl https://doi.org/10.1191/0959683603hl611rp 2024-03-08T03:20:40Z A record of Holocene hydrological changes has been produced from variations in oxygen-isotope composition (δ 18 O) preserved in freshwater lake sediments from maritime Antarctica. Small amounts (<5%) of authigenic carbonate have been extracted from a non-marl sediment core from Sombre Lake, Signy Island (60°43'S, 45°38'W). Oxygen-isotope and particle-size analysis provide a sensitive record of hydrological events in the lake arising from local and regional climate phenomena. The climate affects δ 18 O through snowpack volume and glacier activity in the catchment, lakewater temperatures, the input versus evaporation balance and the duration of seasonal lake ice cover. The most depleted (negative) δ 18 O values are associated with influxes of meltwater at times of glacier advance or retreat. Enriched (positive) δ 18 O values occur during more arid, warmer conditions with longer periods of open water in summer. This isotope record can be used to determine century-scale to decadal variability in air circulation and moisture origin. Strong similarities with other Holo cene proxy records from the Weddell Sea and Antarctic Peninsula Region are apparent, including the mid-Holocene climate optimum followed by the Neoglacial and, most recently, late twentieth-century climatic warming. The oxygen-isotope record from Sombre Lake illustrates the importance of remote islands in contribu ting to our understanding of teleconnections in atmospheric and oceanographic circulation, sea-ice extent, air temperatures and precipitation in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice Signy Island Southern Ocean Weddell Sea SAGE Publications Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Holo ENVELOPE(9.954,9.954,63.343,63.343) Sombre Lake ENVELOPE(-45.615,-45.615,-60.687,-60.687) The Holocene 13 2 251 263 |
institution |
Open Polar |
collection |
SAGE Publications |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Noon, P. E. Leng, M. J. Jones, V. J. Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
A record of Holocene hydrological changes has been produced from variations in oxygen-isotope composition (δ 18 O) preserved in freshwater lake sediments from maritime Antarctica. Small amounts (<5%) of authigenic carbonate have been extracted from a non-marl sediment core from Sombre Lake, Signy Island (60°43'S, 45°38'W). Oxygen-isotope and particle-size analysis provide a sensitive record of hydrological events in the lake arising from local and regional climate phenomena. The climate affects δ 18 O through snowpack volume and glacier activity in the catchment, lakewater temperatures, the input versus evaporation balance and the duration of seasonal lake ice cover. The most depleted (negative) δ 18 O values are associated with influxes of meltwater at times of glacier advance or retreat. Enriched (positive) δ 18 O values occur during more arid, warmer conditions with longer periods of open water in summer. This isotope record can be used to determine century-scale to decadal variability in air circulation and moisture origin. Strong similarities with other Holo cene proxy records from the Weddell Sea and Antarctic Peninsula Region are apparent, including the mid-Holocene climate optimum followed by the Neoglacial and, most recently, late twentieth-century climatic warming. The oxygen-isotope record from Sombre Lake illustrates the importance of remote islands in contribu ting to our understanding of teleconnections in atmospheric and oceanographic circulation, sea-ice extent, air temperatures and precipitation in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Noon, P. E. Leng, M. J. Jones, V. J. |
author_facet |
Noon, P. E. Leng, M. J. Jones, V. J. |
author_sort |
Noon, P. E. |
title |
Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_short |
Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full |
Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_fullStr |
Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full_unstemmed |
Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_sort |
oxygen-isotope (δ18o) evidence of holocene hydrological changes at signy island, maritime antarctica |
publisher |
SAGE Publications |
publishDate |
2003 |
url |
http://dx.doi.org/10.1191/0959683603hl611rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl611rp |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(9.954,9.954,63.343,63.343) ENVELOPE(-45.615,-45.615,-60.687,-60.687) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell Signy Island Holo Sombre Lake |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell Signy Island Holo Sombre Lake |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice Signy Island Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice Signy Island Southern Ocean Weddell Sea |
op_source |
The Holocene volume 13, issue 2, page 251-263 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683603hl611rp |
container_title |
The Holocene |
container_volume |
13 |
container_issue |
2 |
container_start_page |
251 |
op_container_end_page |
263 |
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1795662044959080448 |