The Cryosphere, 7, 569-582, 2013
www.the-cryosphere.net/7/569/2013/
doi:10.5194/tc-7-569-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Balanced conditions or slight mass gain of glaciers in the Lahaul and Spiti region (northern India, Himalaya) during the nineties preceded recent mass loss
C. Vincent1, Al. Ramanathan2, P. Wagnon3,7, D. P. Dobhal4, A. Linda2, E. Berthier5, P. Sharma6, Y. Arnaud3, M. F. Azam2,3, P. G. Jose2, and J. Gardelle1
1UJF – Grenoble1 / CNRS, Laboratoire de Glaciologie et Géophysique de l´ Environnement (LGGE) UMR 5183, Grenoble, 38041, France
2School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
3IRD / UJF – Grenoble 1 / CNRS / G-INP, LGGE UMR 5183, LTHE UMR 5564, Grenoble, 38402, France
4Wadia Institute of Himalayan Geology, Dehra Dun 248 001, India
5CNRS, Université de Toulouse, LEGOS, 14 av. Ed. Belin Toulouse 31400 France
6National Centre for Antarctic and Ocean Research, Headland Sada, Goa 403804, India
7ICIMOD, GPO Box 3226, Kathmandu, Nepal

Abstract. 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.

Citation: Vincent, C., Ramanathan, Al., Wagnon, P., Dobhal, D. P., Linda, A., Berthier, E., Sharma, P., Arnaud, Y., Azam, M. F., Jose, P. G., and Gardelle, J.: Balanced conditions or slight mass gain of glaciers in the Lahaul and Spiti region (northern India, Himalaya) during the nineties preceded recent mass loss, The Cryosphere, 7, 569-582, doi:10.5194/tc-7-569-2013, 2013.
 
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