TY - JOUR
T1 - Glacier mass budget and climate reanalysis data indicate a climatic shift around 2000 in Lahaul-Spiti, western Himalaya
AU - Mukherjee, Kriti
AU - Bhattacharya, Atanu
AU - Pieczonka, Tino
AU - Ghosh, Susmita
AU - Bolch, Tobias
N1 - Funding Information:
Acknowledgements KM acknowledges the personal communications of M. Chen for PREC/L data, C. Smith for NCEP/NCAR data and S Nair for Cartosat data. AB acknowledges AvH foundation for supporting his research at TU Dresden. SG acknowledges NIT Silchar for providing Cartosat data. The authors are grateful for the proofread by B. A. Robson and for the constructive comments by the anonymous reviewers, which helped to improve the quality of the manuscript.
Publisher Copyright:
© 2018, Springer Science+Business Media B.V., part of Springer Nature.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - While glacier mass changes in the Himalaya since the year 2000 are relatively well investigated, there is still a lack of knowledge about the long-term changes and their climatic drivers. We use historical and recent remote sensing data to study glacier changes of the Lahaul-Spiti region in western Himalaya, India, over the last four decades (1971–2013). The glaciers were losing mass moderately between 1971 and 1999 (− 0.07 ± 0.1 m w.e. year−1) while the losses have increased significantly after 2000 (− 0.30 ± 0.1 m w.e. year−1). During both periods, the debris-covered glaciers and glaciers having pro-glacial lakes lost more mass than glaciers with little debris cover. Mass changes of Chhota Shigri, a benchmark glacier, closely matched the average of the overall study area. Analysis of gridded climate data covering the period 1948–2015 shows that the mean annual air temperature increased, especially since 1995. One dataset shows a significant increase in summer temperature after 2000 while others do not show any trend. The mean annual precipitation started decreasing around 1995 and reached a minimum around 2000, after which it increased again. One dataset shows a significant decrease in winter precipitation after 2000 while the others show no trend. The climate data indicate that the increase in mean annual temperature from 1995, combined with no significant trend/significant decrease of winter precipitation in the period after 2000, has probably resulted in accelerated mass loss of the glaciers.
AB - While glacier mass changes in the Himalaya since the year 2000 are relatively well investigated, there is still a lack of knowledge about the long-term changes and their climatic drivers. We use historical and recent remote sensing data to study glacier changes of the Lahaul-Spiti region in western Himalaya, India, over the last four decades (1971–2013). The glaciers were losing mass moderately between 1971 and 1999 (− 0.07 ± 0.1 m w.e. year−1) while the losses have increased significantly after 2000 (− 0.30 ± 0.1 m w.e. year−1). During both periods, the debris-covered glaciers and glaciers having pro-glacial lakes lost more mass than glaciers with little debris cover. Mass changes of Chhota Shigri, a benchmark glacier, closely matched the average of the overall study area. Analysis of gridded climate data covering the period 1948–2015 shows that the mean annual air temperature increased, especially since 1995. One dataset shows a significant increase in summer temperature after 2000 while others do not show any trend. The mean annual precipitation started decreasing around 1995 and reached a minimum around 2000, after which it increased again. One dataset shows a significant decrease in winter precipitation after 2000 while the others show no trend. The climate data indicate that the increase in mean annual temperature from 1995, combined with no significant trend/significant decrease of winter precipitation in the period after 2000, has probably resulted in accelerated mass loss of the glaciers.
KW - Climate reanalysis data
KW - Climatic trend
KW - Geodetic mass balance
KW - Glacier changes
KW - Lahaul-Spiti, Indian Himalaya
KW - US spy satellite image
UR - http://www.scopus.com/inward/record.url?scp=85045266541&partnerID=8YFLogxK
U2 - 10.1007/s10584-018-2185-3
DO - 10.1007/s10584-018-2185-3
M3 - Article
AN - SCOPUS:85045266541
SN - 0165-0009
VL - 148
SP - 219
EP - 233
JO - Climatic Change
JF - Climatic Change
IS - 1-2
ER -