QUICK AND HETEROGENEOUS GLACIER DOWNWASTING AT EVEREST (QOMOLANGMA) FROM 2000 TO 2012 BASED ON BISTATIC SAR INTERFEROMETRY

摘要

Himalayan and its surroundings distribute thernworld’s largest part of low-latitude high-altitude glaciersrnand contributed about 10% of total glacier mass lost inrnrecent decade. Remote sensing geodetic observationrnincluding satellite altimetry and topography arernalternatives of mapping glacier height changes given thernharsh environment of in-situ observations. In thisrnresearch, we applied two pairs of X-band bistaticrnTerraSAR-X/TanDEM-X images obtained in 2011 andrn2012 and formed TanDEM-X DEM with bistaticrninterferometry. By referring to C and X-band SRTMrnobtained in 2000. Glacier Mass balance for Everest andrnits surroundings was -0.446 ± 0.120 m w.e. a~(-1). Glacierrnlost at south slope was a bit more severe than north slope,rnwhich are -0.481 ± 0.129 m w.e. a~(-1) and -0.419 ± 0.119rnm w.e. ~(-1). Basically debris-cover suppressed glacierrnmass lost at most elevations, however for long and largernglacier such as Rongbuk, at high elevation debris-coverrnleaded to a higher lost rate. Comparing to previous studyrnderived glaciers mass balance with stereornphotogrammetry, glacier lost rate accelerated in last fewrndecades for the whole Everest region. Two largestrnglaciers, Rongbuk Glacier at north slope and KhumburnGlacier at south slope both presented increasing massrnlost rates.