Rijksuniversiteit Groningen / Centrum voor Isotopen Onderzoek
 
English | Nederlands

Two ice-core δ18O records from Svalbard illustrating climate and sea-ice variability over the last 400 years

(2005) Isaksson, Elisabeth; Kohler, Jack; Pohjola, Veijo; Moore, John; Igarashi, Makoto; Karlöf, Lars; Martma, Tõnu; Meijer, Harro; Motoyama, Hideaki; Vaikmäe, Rein; Wal, Roderik S.W. van de

Ice cores from the relatively low-lying ice caps in Svalbard have not been widely exploited in climatic studies owing to uncertainties about the effect of meltwater percolation. However, results from two new Svalbard ice cores, at Lomonosovfonna and Austfonna, have shown that with careful site selection, high-resolution sampling and multiple chemical analyses it is possible to recover ice cores from which part of the annual signals are preserved, despite the considerable meltwater percolation. The new Svalbard ice cores are positioned in different parts of Svalbard and cover the past 800 years. In this paper we focus on the last 400 years. The δ18O signals from the cores are qualitatively similar over most of the twentieth century, suggesting that they record the same atmospheric signal. Prior to AD 1920, the Austfonna ice core exhibits more negative δ18O values than Lomonosovfonna, although there are intermittent decadal-scale periods throughout the record with similar values. We suggest that the differences reflect the effect of the inversion layer during the winter. The pattern in the δ18O records is similar to the Longyearbyen air-temperature record, but on an annual level the correlation is low. The Austfonna record correlates well with the temperature record from the more distant and southwesterly located Jan Mayen. A comparison of the ice-core and sea-ice records from this period suggests that sea-ice extent and Austfonna δ18O are related over the past 400 years. This may reflect the position of the storm tracks and their direct influence on the relatively low-altitude Austfonna. Lomonosovfonna may be less sensitive to such changes and primarily record free atmospheric changes instead of variations in sea-ice extent, the latter is probably a result of its higher elevation.




file:2005HoloceneIsaksson.pdf

Gebruik a.u.b. deze link om te verwijzen naar dit document:
http://irs.ub.rug.nl/dbi/478cbda62b6ec

ID 1238
Moeder ID 1228
Volgorde Isaksson, E.
Naam HoloceneIsaksson
Publiceren yes
OAI-naam Article
Path root/2005/HoloceneIsaksson/
Gemaakt op: 2008-01-15 14:05:27
Gemodificeerd op: 2010-02-08 13:27:42
Digitaal ID 478cbda62b6ec
Titel Two ice-core δ18O records from Svalbard illustrating climate and sea-ice variability over the last 400 years
Titelvolgorde Two ice core δ18O records Svalbard illustrating climate sea ice variability last 400 years
Ruilverkeer mogelijk no
Printen in opdracht no
Aantal pagina's 9
Publicatiejaar 2005
Verslagjaar 2008
Taal en
Type Article / Letter to editor
Beschrijving Ice cores from the relatively low-lying ice caps in Svalbard have not been widely exploited in climatic studies owing to uncertainties about the effect of meltwater percolation. However, results from two new Svalbard ice cores, at Lomonosovfonna and Austfonna, have shown that with careful site selection, high-resolution sampling and multiple chemical analyses it is possible to recover ice cores from which part of the annual signals are preserved, despite the considerable meltwater percolation. The new Svalbard ice cores are positioned in different parts of Svalbard and cover the past 800 years. In this paper we focus on the last 400 years. The δ18O signals from the cores are qualitatively similar over most of the twentieth century, suggesting that they record the same atmospheric signal. Prior to AD 1920, the Austfonna ice core exhibits more negative δ18O values than Lomonosovfonna, although there are intermittent decadal-scale periods throughout the record with similar values. We suggest that the differences reflect the effect of the inversion layer during the winter. The pattern in the δ18O records is similar to the Longyearbyen air-temperature record, but on an annual level the correlation is low. The Austfonna record correlates well with the temperature record from the more distant and southwesterly located Jan Mayen. A comparison of the ice-core and sea-ice records from this period suggests that sea-ice extent and Austfonna δ18O are related over the past 400 years. This may reflect the position of the storm tracks and their direct influence on the relatively low-altitude Austfonna. Lomonosovfonna may be less sensitive to such changes and primarily record free atmospheric changes instead of variations in sea-ice extent, the latter is probably a result of its higher elevation.
Uitgever University of Groningen. Centre for Isotope Research
Relatie URI http://www.rug.nl/ees/onderzoek/cio/index
Rechten University of Groningen. Centre for Isotope Research
DOI 10.1191/0959683605hl820rp
DOI flag 2
Trefwoorden ice-cores; climatic change; δ18O records; meteorology; sea ice; oxygen isotopes; stable isotopes; Svalbard; late Holocene
Auteur(s) Isaksson, Elisabeth; Kohler, Jack; Pohjola, Veijo; Moore, John; Igarashi, Makoto; Karlöf, Lars; Martma, Tõnu; Meijer, Harro; Motoyama, Hideaki; Vaikmäe, Rein; Wal, Roderik S.W. van de


 
To top