High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core
A 45.97 m long ice core was recovered in the accumulation area of Glaciar Tyndall (50°59'05'' S,73°31'12'' W;1756 m a.s.l.), Campo de Hielo Patagónico Sur (southern Patagonia icefield),during December 1999.The firn core was subjected to visual stratigraphic observation...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/50944 2023-11-05T03:32:24+01:00 High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core Shiraiwa, Takayuki Kohshima, Shiro Uemura, Ryu Yoshida, Naohiro Matoba, Sumito Uetake, Jun Godoi, Maria Angelica http://hdl.handle.net/2115/50944 https://doi.org/10.3189/172756402781816942 eng eng http://www.igsoc.org/ http://hdl.handle.net/2115/50944 Annals of Glaciology, 35(1): 84-90 http://dx.doi.org/10.3189/172756402781816942 © 2002 International Glaciological Society 450 article fthokunivhus https://doi.org/10.3189/172756402781816942 2023-10-06T00:06:41Z A 45.97 m long ice core was recovered in the accumulation area of Glaciar Tyndall (50°59'05'' S,73°31'12'' W;1756 m a.s.l.), Campo de Hielo Patagónico Sur (southern Patagonia icefield),during December 1999.The firn core was subjected to visual stratigraphic observation and bulk density measurements in the field, and later to analyses of water isotopes (δ18O, δD), major dissolved ions and snow algal biomass. The drillhole remained dry down to about 43 m depth, where a water-soaked layer appeared. Seasonal cycles were found for δ18O, δD and the D-excess, although the amplitudes of the cycles decreased with depth. Major dissolved ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-) and algal biomass exhibit rapid decreases in the upper 3 m, probably due to meltwater elution. Annual increments defined by the δ18O and D-excess peaks suggest that the minimum net accumulation rates at this location were 17.8 m a-1 in 1997/98-1998/99 and >11.0 m a-1 in 1998/99-1999/2000. These are much higher values than those previously obtained from past ice-core studies in Patagonia, but are of the same order of magnitude as those predicted from various observations in ablation areas of Patagonian glaciers. Article in Journal/Newspaper Annals of Glaciology ice core Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Annals of Glaciology 35 84 90 |
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Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
450 |
spellingShingle |
450 Shiraiwa, Takayuki Kohshima, Shiro Uemura, Ryu Yoshida, Naohiro Matoba, Sumito Uetake, Jun Godoi, Maria Angelica High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
topic_facet |
450 |
description |
A 45.97 m long ice core was recovered in the accumulation area of Glaciar Tyndall (50°59'05'' S,73°31'12'' W;1756 m a.s.l.), Campo de Hielo Patagónico Sur (southern Patagonia icefield),during December 1999.The firn core was subjected to visual stratigraphic observation and bulk density measurements in the field, and later to analyses of water isotopes (δ18O, δD), major dissolved ions and snow algal biomass. The drillhole remained dry down to about 43 m depth, where a water-soaked layer appeared. Seasonal cycles were found for δ18O, δD and the D-excess, although the amplitudes of the cycles decreased with depth. Major dissolved ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-) and algal biomass exhibit rapid decreases in the upper 3 m, probably due to meltwater elution. Annual increments defined by the δ18O and D-excess peaks suggest that the minimum net accumulation rates at this location were 17.8 m a-1 in 1997/98-1998/99 and >11.0 m a-1 in 1998/99-1999/2000. These are much higher values than those previously obtained from past ice-core studies in Patagonia, but are of the same order of magnitude as those predicted from various observations in ablation areas of Patagonian glaciers. |
format |
Article in Journal/Newspaper |
author |
Shiraiwa, Takayuki Kohshima, Shiro Uemura, Ryu Yoshida, Naohiro Matoba, Sumito Uetake, Jun Godoi, Maria Angelica |
author_facet |
Shiraiwa, Takayuki Kohshima, Shiro Uemura, Ryu Yoshida, Naohiro Matoba, Sumito Uetake, Jun Godoi, Maria Angelica |
author_sort |
Shiraiwa, Takayuki |
title |
High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
title_short |
High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
title_full |
High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
title_fullStr |
High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
title_full_unstemmed |
High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core |
title_sort |
high net accumulation rates at campo de hielo patago´nico sur, south america, revealed by analysis of a 45.97 m long ice core |
url |
http://hdl.handle.net/2115/50944 https://doi.org/10.3189/172756402781816942 |
genre |
Annals of Glaciology ice core |
genre_facet |
Annals of Glaciology ice core |
op_relation |
http://www.igsoc.org/ http://hdl.handle.net/2115/50944 Annals of Glaciology, 35(1): 84-90 http://dx.doi.org/10.3189/172756402781816942 |
op_rights |
© 2002 International Glaciological Society |
op_doi |
https://doi.org/10.3189/172756402781816942 |
container_title |
Annals of Glaciology |
container_volume |
35 |
container_start_page |
84 |
op_container_end_page |
90 |
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1781695608493441024 |