Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s
Tree-ring δ18O values are a sensitive proxy for regional physical climate, while their δ13C values are a strong predictor of local ecohydrology. Utilizing available ice-core and tree-ring δ18O records from the central Himalaya (CH), we found an increase in east–west climate heterogeneity since the 1...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-15-95-2021 https://tc.copernicus.org/articles/15/95/2021/tc-15-95-2021.pdf https://doaj.org/article/c70377dfa822426bab1cd345c4d9c4b8 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:c70377dfa822426bab1cd345c4d9c4b8 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:c70377dfa822426bab1cd345c4d9c4b8 2023-05-15T16:39:11+02:00 Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s N. Singh M. Shekhar J. Singh A. K. Gupta A. Bräuning C. Mayr M. Singhal 2021-01-01 https://doi.org/10.5194/tc-15-95-2021 https://tc.copernicus.org/articles/15/95/2021/tc-15-95-2021.pdf https://doaj.org/article/c70377dfa822426bab1cd345c4d9c4b8 en eng Copernicus Publications doi:10.5194/tc-15-95-2021 1994-0416 1994-0424 https://tc.copernicus.org/articles/15/95/2021/tc-15-95-2021.pdf https://doaj.org/article/c70377dfa822426bab1cd345c4d9c4b8 undefined The Cryosphere, Vol 15, Pp 95-112 (2021) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/tc-15-95-2021 2023-01-22T17:50:58Z Tree-ring δ18O values are a sensitive proxy for regional physical climate, while their δ13C values are a strong predictor of local ecohydrology. Utilizing available ice-core and tree-ring δ18O records from the central Himalaya (CH), we found an increase in east–west climate heterogeneity since the 1960s. Further, δ13C records from transitional western glaciated valleys provide a robust basis for reconstructing about 3 centuries of glacier mass balance (GMB) dynamics. We reconstructed annually resolved GMB since 1743 CE based on regionally dominant tree species of diverse plant functional types. Three major phases became apparent: positive GMB up to the mid-19th century, the middle phase (1870–1960) of slightly negative but stable GMB, and an exponential ice mass loss since the 1960s. Reasons for accelerated mass loss are largely attributed to anthropogenic climate change, including concurrent alterations in atmospheric circulations (weakening of the westerlies and the Arabian Sea branch of the Indian summer monsoon). Multi-decadal isotopic and climate coherency analyses specify an eastward declining influence of the westerlies in the monsoon-dominated CH region. Besides, our study provides a long-term context for recent GMB variability, which is essential for its reliable projection and attribution. Article in Journal/Newspaper ice core The Cryosphere Unknown Indian The Cryosphere 15 1 95 112 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo N. Singh M. Shekhar J. Singh A. K. Gupta A. Bräuning C. Mayr M. Singhal Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
topic_facet |
envir geo |
description |
Tree-ring δ18O values are a sensitive proxy for regional physical climate, while their δ13C values are a strong predictor of local ecohydrology. Utilizing available ice-core and tree-ring δ18O records from the central Himalaya (CH), we found an increase in east–west climate heterogeneity since the 1960s. Further, δ13C records from transitional western glaciated valleys provide a robust basis for reconstructing about 3 centuries of glacier mass balance (GMB) dynamics. We reconstructed annually resolved GMB since 1743 CE based on regionally dominant tree species of diverse plant functional types. Three major phases became apparent: positive GMB up to the mid-19th century, the middle phase (1870–1960) of slightly negative but stable GMB, and an exponential ice mass loss since the 1960s. Reasons for accelerated mass loss are largely attributed to anthropogenic climate change, including concurrent alterations in atmospheric circulations (weakening of the westerlies and the Arabian Sea branch of the Indian summer monsoon). Multi-decadal isotopic and climate coherency analyses specify an eastward declining influence of the westerlies in the monsoon-dominated CH region. Besides, our study provides a long-term context for recent GMB variability, which is essential for its reliable projection and attribution. |
format |
Article in Journal/Newspaper |
author |
N. Singh M. Shekhar J. Singh A. K. Gupta A. Bräuning C. Mayr M. Singhal |
author_facet |
N. Singh M. Shekhar J. Singh A. K. Gupta A. Bräuning C. Mayr M. Singhal |
author_sort |
N. Singh |
title |
Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
title_short |
Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
title_full |
Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
title_fullStr |
Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
title_full_unstemmed |
Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
title_sort |
central himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-95-2021 https://tc.copernicus.org/articles/15/95/2021/tc-15-95-2021.pdf https://doaj.org/article/c70377dfa822426bab1cd345c4d9c4b8 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
ice core The Cryosphere |
genre_facet |
ice core The Cryosphere |
op_source |
The Cryosphere, Vol 15, Pp 95-112 (2021) |
op_relation |
doi:10.5194/tc-15-95-2021 1994-0416 1994-0424 https://tc.copernicus.org/articles/15/95/2021/tc-15-95-2021.pdf https://doaj.org/article/c70377dfa822426bab1cd345c4d9c4b8 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-15-95-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
1 |
container_start_page |
95 |
op_container_end_page |
112 |
_version_ |
1766029520407625728 |