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| Titel |
Balanced conditions or slight mass gain of glaciers in the Lahaul and Spiti region (northern India, Himalaya) during the nineties preceded recent mass loss |
| VerfasserIn |
C. Vincent, Al. Ramanathan, P. Wagnon, D. P. Dobhal, A. Linda, E. Berthier, P. Sharma, Y. Arnaud, M. F. Azam, P. G. Jose, J. Gardelle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 2 ; Nr. 7, no. 2 (2013-04-03), S.569-582 |
| Datensatznummer |
250017951
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| Publikation (Nr.) |
 copernicus.org/tc-7-569-2013.pdf |
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| Zusammenfassung |
| The volume change of the Chhota Shigri Glacier (India, 32° 20 N,
77° 30' E) between 1988 and 2010 has been determined using in situ
geodetic measurements. This glacier has experienced only a slight mass loss
between 1988 and 2010 (−3.8 ± 2.0 m w.e. (water equivalent) corresponding to −0.17 ± 0.09 m w.e. yr−1). Using satellite digital elevation models
(DEM) differencing and field measurements, we measure a negative mass
balance (MB) between 1999 and 2010 (−4.8 ± 1.8 m w.e. corresponding to
−0.44 ± 0.16 m w.e. yr−1). Thus, we deduce a slightly positive or
near-zero MB between 1988 and 1999 (+1.0 ± 2.7 m w.e. corresponding
to +0.09 ± 0.24 m w.e. yr−1). Furthermore, satellite DEM
differencing reveals that the MB of the Chhota Shigri Glacier (−0.39 ± 0.15 m w.e. yr−1) has been only slightly less negative than the MB of a
2110 km2 glaciarized area in the Lahaul and Spiti region
(−0.44 ± 0.09 m w.e. yr−1) during 1999−2011. Hence, we conclude
that the ice wastage is probably moderate in this region over the last 22 yr, with near equilibrium conditions during the nineties, and an ice mass
loss after. The turning point from balanced to negative mass budget is not
known but lies probably in the late nineties and at the latest in 1999. This
positive or near-zero MB for Chhota Shigri Glacier (and probably for the
surrounding glaciers of the Lahaul and Spiti region) during at least part of
the 1990s contrasts with a recent compilation of MB data in the Himalayan
range that indicated ice wastage since 1975. However, in agreement with this
compilation, we confirm more negative balances since the beginning of the
21st century. |
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