Oxygen-isotope (delta O-18) 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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ARNOLD, HODDER HEADLINE PLC
2003
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ftucl:oai:eprints.ucl.ac.uk.OAI2:1310221 2023-05-15T13:57:22+02:00 Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica Noon, PE Leng, MJ Jones, VJ 2003 http://discovery.ucl.ac.uk/1310221/ unknown ARNOLD, HODDER HEADLINE PLC HOLOCENE , 13 (2) 251 - 263. (2003) oxygen isotopes lake sediment carbonate palaeoclimate hydrology Antarctica Holocene SOUTH-ORKNEY ISLANDS TIERRA-DEL-FUEGO LAKE-SEDIMENTS CLIMATE-CHANGE GLACIER FLUCTUATIONS STABLE-ISOTOPE ICE CORE SEA-ICE OCEAN RECORD Article 2003 ftucl 2013-11-10T04:21:46Z 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 ice core Sea ice Signy Island South Orkney Islands Southern Ocean Weddell Sea Tierra del Fuego University College London: UCL Discovery 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) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Southern Ocean Weddell Weddell Sea |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
oxygen isotopes lake sediment carbonate palaeoclimate hydrology Antarctica Holocene SOUTH-ORKNEY ISLANDS TIERRA-DEL-FUEGO LAKE-SEDIMENTS CLIMATE-CHANGE GLACIER FLUCTUATIONS STABLE-ISOTOPE ICE CORE SEA-ICE OCEAN RECORD |
spellingShingle |
oxygen isotopes lake sediment carbonate palaeoclimate hydrology Antarctica Holocene SOUTH-ORKNEY ISLANDS TIERRA-DEL-FUEGO LAKE-SEDIMENTS CLIMATE-CHANGE GLACIER FLUCTUATIONS STABLE-ISOTOPE ICE CORE SEA-ICE OCEAN RECORD Noon, PE Leng, MJ Jones, VJ Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
topic_facet |
oxygen isotopes lake sediment carbonate palaeoclimate hydrology Antarctica Holocene SOUTH-ORKNEY ISLANDS TIERRA-DEL-FUEGO LAKE-SEDIMENTS CLIMATE-CHANGE GLACIER FLUCTUATIONS STABLE-ISOTOPE ICE CORE SEA-ICE OCEAN RECORD |
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, PE Leng, MJ Jones, VJ |
author_facet |
Noon, PE Leng, MJ Jones, VJ |
author_sort |
Noon, PE |
title |
Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_short |
Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full |
Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_fullStr |
Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_full_unstemmed |
Oxygen-isotope (delta O-18) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica |
title_sort |
oxygen-isotope (delta o-18) evidence of holocene hydrological changes at signy island, maritime antarctica |
publisher |
ARNOLD, HODDER HEADLINE PLC |
publishDate |
2003 |
url |
http://discovery.ucl.ac.uk/1310221/ |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) ENVELOPE(-45.615,-45.615,-60.687,-60.687) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Antarctic Peninsula Signy Island Sombre Lake South Orkney Islands Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Signy Island Sombre Lake South Orkney Islands Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Sea ice Signy Island South Orkney Islands Southern Ocean Weddell Sea Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Sea ice Signy Island South Orkney Islands Southern Ocean Weddell Sea Tierra del Fuego |
op_source |
HOLOCENE , 13 (2) 251 - 263. (2003) |
_version_ |
1766265053884973056 |