Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics
Measurements of natural and artificial radioisotopes ( 32 Si, 210 Pb and 137 Cs) and oxygen isotopes (δ 18 O) have been carried out on surface snow and ice, shallow snow pits and an ice core collected from Dokriani Bamak glacier, central Himalaya, to study the dynamics of glacier ice and short-term...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
International Glacial Society
2002
|
Subjects: | |
Online Access: | http://repository.ias.ac.in/86504/ http://www.ingentaconnect.com/content/igsoc/jog/2002/00000048/00000160/art00009 |
id |
ftindianacasci:oai:repository.ias.ac.in:86504 |
---|---|
record_format |
openpolar |
spelling |
ftindianacasci:oai:repository.ias.ac.in:86504 2023-05-15T16:38:50+02:00 Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan 2002-01-01 http://repository.ias.ac.in/86504/ http://www.ingentaconnect.com/content/igsoc/jog/2002/00000048/00000160/art00009 unknown International Glacial Society Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan (2002) Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics Journal of Glaciology, 48 (160). pp. 81-86. ISSN 0022-1430 QE Geology Article PeerReviewed 2002 ftindianacasci 2013-01-20T13:27:33Z Measurements of natural and artificial radioisotopes ( 32 Si, 210 Pb and 137 Cs) and oxygen isotopes (δ 18 O) have been carried out on surface snow and ice, shallow snow pits and an ice core collected from Dokriani Bamak glacier, central Himalaya, to study the dynamics of glacier ice and short-term climatic changes. Based on the 32 Si and 210 Pb activities in the meltwaters, the age of the snout ice is 400 years and the flow rate of ice along the glacier length is ~ 14 m a -1 . The specific activity of 137 Cs, corresponding to 1963 fallout, in the surface ice at the equilibrium line yields a flow rate of 32 m a -1 , a factor of two higher than that derived for the snout ice. The depth variation of 137 Cs concentration in a shallow ice core yields a mean accumulation rate of 0.43 m a -1 for the glacier ice over the past decade. The δ 18 O of snout ice (-13.4%.) is significantly depleted compared to the average value of -9.2%. in the shallow ice core, indicating that cooler climatic conditions prevailed around AD 1600. Based on the oxygen isotopic ratios in the shallow pits, an "altitude effect of 0.9%. per 100 m in δ 18 O variation is documented for this glacier. Article in Journal/Newspaper ice core Journal of Glaciology Indian Academy of Sciences: Publication of Fellows |
institution |
Open Polar |
collection |
Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
topic_facet |
QE Geology |
description |
Measurements of natural and artificial radioisotopes ( 32 Si, 210 Pb and 137 Cs) and oxygen isotopes (δ 18 O) have been carried out on surface snow and ice, shallow snow pits and an ice core collected from Dokriani Bamak glacier, central Himalaya, to study the dynamics of glacier ice and short-term climatic changes. Based on the 32 Si and 210 Pb activities in the meltwaters, the age of the snout ice is 400 years and the flow rate of ice along the glacier length is ~ 14 m a -1 . The specific activity of 137 Cs, corresponding to 1963 fallout, in the surface ice at the equilibrium line yields a flow rate of 32 m a -1 , a factor of two higher than that derived for the snout ice. The depth variation of 137 Cs concentration in a shallow ice core yields a mean accumulation rate of 0.43 m a -1 for the glacier ice over the past decade. The δ 18 O of snout ice (-13.4%.) is significantly depleted compared to the average value of -9.2%. in the shallow ice core, indicating that cooler climatic conditions prevailed around AD 1600. Based on the oxygen isotopic ratios in the shallow pits, an "altitude effect of 0.9%. per 100 m in δ 18 O variation is documented for this glacier. |
format |
Article in Journal/Newspaper |
author |
Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan |
author_facet |
Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan |
author_sort |
Vasant, Nijampurkar |
title |
Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
title_short |
Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
title_full |
Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
title_fullStr |
Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
title_full_unstemmed |
Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics |
title_sort |
isotopic study on dokriani bamak glacier, central himalaya: implications for climatic changes and ice dynamics |
publisher |
International Glacial Society |
publishDate |
2002 |
url |
http://repository.ias.ac.in/86504/ http://www.ingentaconnect.com/content/igsoc/jog/2002/00000048/00000160/art00009 |
genre |
ice core Journal of Glaciology |
genre_facet |
ice core Journal of Glaciology |
op_relation |
Vasant, Nijampurkar Kameswara, Rao Manmohan, Sarin Joseph, Gergan (2002) Isotopic study on Dokriani Bamak glacier, Central Himalaya: implications for climatic changes and ice dynamics Journal of Glaciology, 48 (160). pp. 81-86. ISSN 0022-1430 |
_version_ |
1766029166461845504 |