An analysis of snow cover changes in the Himalayan region using MODIS snow products and in-situ temperature data

Amidst growing concerns over the melting of the Himalayas’ snow and glaciers, we strive to answer some of the questions related to snow cover changes in the Himalayan region covering Nepal and its vicinity using Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover products from 2000 to 2008 as well as in-situ temperature data from two high altitude stations and net radiation and wind speed data from one station. The analysis consists of trend analysis based on the Spearman’s rank correlation on monthly, seasonal and annual snow cover changes over five different elevation zones above 3,000 m. There are decreasing trends in January and in winter for three of the five elevation zones (all below 6,000 m), increasing trends in March for two elevation zones above 5,000 m and increasing trends in autumn for four of the five elevation zones (all above 4,000 m). Some of these observed trends, if continue, may result in changes in the spring and autumn season river flows in the region. Dominantly negative correlations are observed between the monthly snow cover and the in-situ temperature, net radiation and wind speed from the Pyramid station at 5,035 m (near Mount Everest). Similar correlations are also observed between the snow cover and the in-situ temperature from the Langtang station at 3,920 m elevation. These correlations explain some of the observed trends and substantiate the reliability of the MODIS snow cover products.

[1]  D. Hall,et al.  Accuracy assessment of the MODIS snow products , 2007 .

[2]  Shunlin Liang,et al.  The altitudinal dependence of recent rapid warming over the Tibetan Plateau , 2009 .

[3]  G. Blöschl,et al.  Validation of MODIS snow cover images over Austria , 2006 .

[4]  Dorothy K. Hall,et al.  Assessment of Snow-Cover Mapping Accuracy in a Variety of Vegetation-Cover Densities in Central Alaska , 1998 .

[5]  J. Palutikof,et al.  Climate change 2007 : impacts, adaptation and vulnerability , 2001 .

[6]  Maosheng Zhao,et al.  A Continuous Satellite-Derived Measure of Global Terrestrial Primary Production , 2004 .

[7]  V. Raina,et al.  Himalayan glaciers: a state-of-art review of glacial studies, glacial retreat and climate change. , 2009 .

[8]  Andrew G. Klein,et al.  Validation of daily MODIS snow cover maps of the Upper Rio Grande River Basin for the 2000–2001 snow year , 2003 .

[9]  Hongjie Xie,et al.  Evaluation of MODIS snow cover and cloud mask and its application in Northern Xinjiang, China , 2008 .

[10]  S. Uhlenbrook,et al.  Trends in temperature and rainfall extremes in the Yellow River source region, China , 2011, Climatic Change.

[11]  Richard Fernandes,et al.  Validation of VEGETATION, MODIS, and GOES + SSM/I snow‐cover products over Canada based on surface snow depth observations , 2003 .

[12]  Xiao-dong Liu,et al.  Climatic warming in the Tibetan Plateau during recent decades , 2000 .

[13]  T. Wilbanks,et al.  Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[14]  M. Bierkens,et al.  Climate Change Will Affect the Asian Water Towers , 2010, Science.

[15]  D. R. Gurung,et al.  Changes in seasonal snow cover in Hindu Kush-Himalayan region , 2011 .

[16]  V. Kale,et al.  Long-term trends in maximum, minimum and mean annual air temperatures across the Northwestern Himalaya during the twentieth century , 2007 .

[17]  D. Cyranoski.  Climate change: The long-range forecast , 2005, Nature.

[18]  Bette Hileman.  NEWS OF THE WEEK: EVALUATING PESTICIDESEPA must consider human test data , 2003 .

[19]  K. Tanner,et al.  Tracking the source of glacier misinformation. , 2010, Science.

[20]  K. Trenberth,et al.  Observations: Surface and Atmospheric Climate Change , 2007 .

[21]  Quirin Schiermeier,et al.  Glacier estimate is on thin ice , 2010, Nature.

[22]  Jack E. Dibb,et al.  Maximum Temperature Trends in the Himalaya and Its Vicinity: An Analysis Based on Temperature Records from Nepal for the Period 1971-94 , 1999 .

[23]  A. Nayar,et al.  Climate: When the ice melts , 2009, Nature.

[24]  N. DiGirolamo,et al.  MODIS snow-cover products , 2002 .

[25]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[26]  P. Bagla.  Climate change. No sign yet of Himalayan meltdown, Indian report finds. , 2009, Science.

[27]  S. M. Jong,et al.  Large-scale monitoring of snow cover and runoff simulation in Himalayan river basins using remote sensing , 2009 .

[28]  T. Barnett,et al.  Potential impacts of a warming climate on water availability in snow-dominated regions , 2005, Nature.

[29]  András Bárdossy,et al.  Cloud removal methodology from MODIS snow cover product , 2009 .