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High net accumulation rates at Campo de Hielo Patago´nico Sur, South America, revealed by analysis of a 45.97 m long ice core

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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
Authors: Shiraiwa, Takayuki Browse this author →KAKEN DB
Kohshima, Shiro Browse this author →KAKEN DB
Uemura, Ryu Browse this author
Yoshida, Naohiro Browse this author →KAKEN DB
Matoba, Sumito Browse this author →KAKEN DB
Uetake, Jun Browse this author
Godoi, Maria Angelica Browse this author
Issue Date: Jan-2002
Journal Title: Annals of Glaciology
Volume: 35
Issue: 1
Start Page: 84
End Page: 90
Publisher DOI: 10.3189/172756402781816942
Abstract: 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.
Rights: © 2002 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 白岩 孝行

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