Oxygen-isotope (delta18O) 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 (delta(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, S...
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SAGE Publications
2003
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Online Access: | http://nora.nerc.ac.uk/id/eprint/12819/ http://hol.sagepub.com/content/13/2/251.abstract |
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ftnerc:oai:nora.nerc.ac.uk:12819 2023-05-15T13:45:11+02:00 Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica Noon, P.E. Leng, M.J. Jones, V.J. 2003 http://nora.nerc.ac.uk/id/eprint/12819/ http://hol.sagepub.com/content/13/2/251.abstract unknown SAGE Publications Noon, P.E.; Leng, M.J. orcid:0000-0003-1115-5166 Jones, V.J. 2003 Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica. Holocene, 13 (2). 251-263. https://doi.org/10.1191/0959683603hl611rp <https://doi.org/10.1191/0959683603hl611rp> Meteorology and Climatology Earth Sciences Hydrology Publication - Article PeerReviewed 2003 ftnerc https://doi.org/10.1191/0959683603hl611rp 2023-02-04T19:28:13Z A record of Holocene hydrological changes has been produced from variations in oxygen-isotope composition (delta(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 degrees 43'S, 45 degrees 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 delta O-18 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) delta O-18 values are associated with influxes of meltwater at times of glacier advance or retreat. Enriched (positive) delta O-18 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 Holocene 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 contributing 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 Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Sombre Lake ENVELOPE(-45.615,-45.615,-60.687,-60.687) Southern Ocean Weddell Weddell Sea The Holocene 13 2 251 263 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology Earth Sciences Hydrology |
spellingShingle |
Meteorology and Climatology Earth Sciences Hydrology Noon, P.E. Leng, M.J. Jones, V.J. Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
topic_facet |
Meteorology and Climatology Earth Sciences Hydrology |
description |
A record of Holocene hydrological changes has been produced from variations in oxygen-isotope composition (delta(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 degrees 43'S, 45 degrees 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 delta O-18 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) delta O-18 values are associated with influxes of meltwater at times of glacier advance or retreat. Enriched (positive) delta O-18 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 Holocene 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 contributing 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 (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_short |
Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full |
Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_fullStr |
Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full_unstemmed |
Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_sort |
oxygen-isotope (delta18o) evidence of holocene hydrological changes at signy island, maritime antarctica |
publisher |
SAGE Publications |
publishDate |
2003 |
url |
http://nora.nerc.ac.uk/id/eprint/12819/ http://hol.sagepub.com/content/13/2/251.abstract |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-45.615,-45.615,-60.687,-60.687) |
geographic |
Antarctic Antarctic Peninsula Signy Island Sombre Lake Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Signy Island Sombre Lake Southern Ocean Weddell Weddell Sea |
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_relation |
Noon, P.E.; Leng, M.J. orcid:0000-0003-1115-5166 Jones, V.J. 2003 Oxygen-isotope (delta18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica. Holocene, 13 (2). 251-263. https://doi.org/10.1191/0959683603hl611rp <https://doi.org/10.1191/0959683603hl611rp> |
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 |
_version_ |
1766215266555920384 |