Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record
Abstract The quality and utility of the records of oxygen-isotopic abundances, dust concentrations and anionic concentrations preserved in the ice at Siple Station (75°55′ S, 84° 15′ W) are assessed from four shallow (20 m) cores. The combination of high accumulation (0.56 m a −1 w.e.) and low mean...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/s002214300004274x 2024-03-03T08:38:50+00:00 Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record Mosley-Thompson, E. Dai, J. Thompson, L. G. Grootes, P. M. Arbogast, James K. Paskievitch, J. F. 1991 http://dx.doi.org/10.1017/s002214300004274x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300004274X en eng Cambridge University Press (CUP) Journal of Glaciology volume 37, issue 125, page 11-22 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1991 crcambridgeupr https://doi.org/10.1017/s002214300004274x 2024-02-08T08:39:08Z Abstract The quality and utility of the records of oxygen-isotopic abundances, dust concentrations and anionic concentrations preserved in the ice at Siple Station (75°55′ S, 84° 15′ W) are assessed from four shallow (20 m) cores. The combination of high accumulation (0.56 m a −1 w.e.) and low mean annual temperature (—24°C) preserves the prominent seasonal variations in δ 18 Ο which are very spatially coherent. Sulfate concentrations vary seasonally and, in conjunction with δ 18 Ο, will allow accurate dating of deeper cores from Siple Station. The concentrations of insoluble dust are the lowest measured in Antarctica, making Siple Station an excellent location to examine large increases in atmospheric tubidity. The seasonal variations and annual fluxes of the anions are examined for the last two decades (AD 1966–85) with regard to probable sources. An unusually high sulfate flux in 1976 may reflect the February 1975 eruption of Mount Ngauruhoe, New Zealand. No annual signal in nitrate concentration is confirmed and no unusually high nitrate fluxes support the suggestion of nitrate production by large solar flares. However, nitrate flux is higher for the latter half of the 1970s and early 1980s, possibly reflecting the recent loss of stratospheric ozone. Finally, comparison of the δ 18 O record with available surface-temperature data (AD 1957–85) reveals that multi-year trends along the western coast of the Antarctic Peninsula are recorded at Siple. More importantly, comparison with areally weighted temperature reconstructions suggests that the δ 18 Ο record may reflect larger-scale, persistent trends in the high southern latitudes. The strong spatial coherence of the preserved records, the potential for accurate dating, and possible relevance to larger-scale processes make Siple Station an excellent site for paleoenvironmental reconstruction from ice cores. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica ice core Journal of Glaciology Cambridge University Press Antarctic The Antarctic Antarctic Peninsula New Zealand Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Journal of Glaciology 37 125 11 22 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Mosley-Thompson, E. Dai, J. Thompson, L. G. Grootes, P. M. Arbogast, James K. Paskievitch, J. F. Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
topic_facet |
Earth-Surface Processes |
description |
Abstract The quality and utility of the records of oxygen-isotopic abundances, dust concentrations and anionic concentrations preserved in the ice at Siple Station (75°55′ S, 84° 15′ W) are assessed from four shallow (20 m) cores. The combination of high accumulation (0.56 m a −1 w.e.) and low mean annual temperature (—24°C) preserves the prominent seasonal variations in δ 18 Ο which are very spatially coherent. Sulfate concentrations vary seasonally and, in conjunction with δ 18 Ο, will allow accurate dating of deeper cores from Siple Station. The concentrations of insoluble dust are the lowest measured in Antarctica, making Siple Station an excellent location to examine large increases in atmospheric tubidity. The seasonal variations and annual fluxes of the anions are examined for the last two decades (AD 1966–85) with regard to probable sources. An unusually high sulfate flux in 1976 may reflect the February 1975 eruption of Mount Ngauruhoe, New Zealand. No annual signal in nitrate concentration is confirmed and no unusually high nitrate fluxes support the suggestion of nitrate production by large solar flares. However, nitrate flux is higher for the latter half of the 1970s and early 1980s, possibly reflecting the recent loss of stratospheric ozone. Finally, comparison of the δ 18 O record with available surface-temperature data (AD 1957–85) reveals that multi-year trends along the western coast of the Antarctic Peninsula are recorded at Siple. More importantly, comparison with areally weighted temperature reconstructions suggests that the δ 18 Ο record may reflect larger-scale, persistent trends in the high southern latitudes. The strong spatial coherence of the preserved records, the potential for accurate dating, and possible relevance to larger-scale processes make Siple Station an excellent site for paleoenvironmental reconstruction from ice cores. |
format |
Article in Journal/Newspaper |
author |
Mosley-Thompson, E. Dai, J. Thompson, L. G. Grootes, P. M. Arbogast, James K. Paskievitch, J. F. |
author_facet |
Mosley-Thompson, E. Dai, J. Thompson, L. G. Grootes, P. M. Arbogast, James K. Paskievitch, J. F. |
author_sort |
Mosley-Thompson, E. |
title |
Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
title_short |
Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
title_full |
Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
title_fullStr |
Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
title_full_unstemmed |
Glaciological studies at Siple Station (Antarctica): potential ice-core paleoclimatic record |
title_sort |
glaciological studies at siple station (antarctica): potential ice-core paleoclimatic record |
publisher |
Cambridge University Press (CUP) |
publishDate |
1991 |
url |
http://dx.doi.org/10.1017/s002214300004274x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300004274X |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Antarctic The Antarctic Antarctic Peninsula New Zealand Siple |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula New Zealand Siple |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core Journal of Glaciology |
op_source |
Journal of Glaciology volume 37, issue 125, page 11-22 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300004274x |
container_title |
Journal of Glaciology |
container_volume |
37 |
container_issue |
125 |
container_start_page |
11 |
op_container_end_page |
22 |
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1792507302876545024 |