Distribution and interannual variability of supraglacial lakes on debris-covered glaciers in the Khan Tengri-Tumor Mountains, Central Asia

Supraglacial lakes are widely formed on debris-covered glaciers in the Khan Tengri-Tumor Mountains (KTTM), Tianshan, Central Asia. Study of their distribution characters based on regional-wide remote sensing investigations is still lacking, but it can promote our understanding about the influence of supraglacial lakes on the surface melting, hydrology and dynamics of debris-covered glaciers in this region. This study presents results of the supraglacial lake inventory in the KTTM region, based on multi-year Landsat images. We focus on the glacio-geomorphological characters of the supraglacial lakes and their late summer conditions, since all suitable Landsat images were acquired between August and September during 1990-2011. With a minimum threshold extent of 3600 m(2) for conservative mapping results, we totally mapped 775 supraglacial lakes and 38 marginal glacial lakes on eight huge debris-covered glaciers. Supraglacial lakes are concentrated on the Tumor Glacier and the South Inylchek Glacier, two biggest glaciers in this region. Although most supraglacial lakes are short-lived, a number of lakes can be repeatedly identified between different Landsat images. Detailed investigation of these 'perennial' lakes on the Tumor Glacier indicates that their filling frequency and area contributions have increased since 2005. Analysis of the area-elevation distributions for all mapped supraglacial lakes shows that they predominantly occur close to the altitude of 3250 ma. s. l., as high as the lowest reach of clean ice where surface debris begins to appear, and can further develop upglacier to a limit of about 3950 ma. s. l.. Total and mean area of supraglacial lakes in the KTTM region during the late summer seasons show great variability between years. Correlation analysis between the annual lake area and the observed nearby meteorological conditions suggests that warmer springs seem related to the draining of some supraglacial lakes during the following seasons, due to the evolution of glacial drainage from unconnected to connected systems by enhanced ablation during the springs.

[1]  Jeff Dozier,et al.  Glacial regime of the highest Tien Shan mountain, Pobeda-Khan Tengry massif , 1997, Journal of Glaciology.

[2]  A. Shrestha,et al.  Glacial Lake Outburst Floods in the Sagarmatha Region , 2007 .

[3]  Achim Helm,et al.  Sub‐debris melt rates on southern inylchek glacier, central tian shan , 2008 .

[4]  Andrew G. Fountain,et al.  Water flow through temperate glaciers , 1998 .

[5]  John M. Reynolds,et al.  On the formation of supraglacial lakes on debris- covered glaciers , 2000 .

[6]  Adrian Luckman,et al.  A rapidly growing moraine-dammed glacial lake on Ngozumpa Glacier, Nepal , 2012 .

[7]  A. Hubbard,et al.  POLYTHERMAL GLACIER HYDROLOGY: A REVIEW , 2011 .

[8]  Achim Helm,et al.  Post‐drainage ice dam response at lake merzbacher, inylchek glacier, kyrgyzstan , 2008 .

[9]  Shi-yin Liu,et al.  Backwasting rate on debris-covered Koxkar glacier, Tuomuer mountain, China , 2010, Journal of Glaciology.

[10]  R. Armstrong,et al.  The Physics of Glaciers , 1981 .

[11]  Tobias Bolch,et al.  Response of debris-covered glaciers in the Mount Everest region to recent warming, and implications for outburst flood hazards , 2012 .

[12]  J. Reynolds.  The identification and mitigation of glacier-related hazards: examples from the Cordillera Blanca, Peru , 1992 .

[13]  Yves Arnaud,et al.  Contrasted evolution of glacial lakes along the Hindu Kush Himalaya mountain range between 1990 and 2009 , 2011 .

[14]  Shi-yin Liu,et al.  Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan , 2014 .

[15]  K. Fujita,et al.  Recent changes in Imja Glacial Lake and its damming moraine in the Nepal Himalaya revealed by in situ surveys and multi-temporal ASTER imagery , 2009 .

[16]  D. Benn,et al.  Growth and drainage of supraglacial lakes on debris-mantled Ngozumpa Glacier, Khumbu Himal, Nepal , 2001, Journal of Glaciology.

[17]  C. Smiraglia,et al.  Glacial lake distribution in the Mount Everest region: Uncertainty of measurement and conditions of formation , 2012 .

[18]  Andreas Kääb,et al.  The new remote-sensing-derived Swiss glacier inventory: I. Methods , 2002, Annals of Glaciology.

[19]  C. Warren,et al.  Calving speed and climatic sensitivity of New Zealand lake-calving glaciers , 2003, Annals of Glaciology.

[20]  B. Janský,et al.  Outburst flood hazard: Case studies from the Tien-Shan Mountains, Kyrgyzstan , 2010 .

[21]  J. Komori.  Recent expansions of glacial lakes in the Bhutan Himalayas , 2008 .

[22]  Koji Fujita,et al.  Formation conditions of supraglacial lakes on debris-covered glaciers in the Himalaya , 2010, Journal of Glaciology.

[23]  Shiyin Liu,et al.  Temporal dynamics of a jökulhlaup system , 2009, Journal of Glaciology.

[24]  V. Beneš,et al.  The evolution of Petrov lake and moraine dam rupture risk (Tien-Shan, Kyrgyzstan) , 2009 .

[25]  A simple model to estimate ice ablation under a thick debris layer , 2006 .

[26]  Jeffrey S. Kargel,et al.  ASTER measurement of supraglacial lakes in the Mount Everest region of the Himalaya , 2002, Annals of Glaciology.

[27]  Liu Shiyin,et al.  Heterogeneous mass loss of glaciers in the Aksu-Tarim Catchment (Central Tien Shan) revealed by 1976 KH-9 Hexagon and 2009 SPOT-5 stereo imagery , 2013 .

[28]  Frank Paul,et al.  A new glacier inventory for the Svartisen region, Norway, from Landsat ETM+ data: challenges and change assessment , 2009, Journal of Glaciology.

[29]  Koji Fujita,et al.  Melt rate of ice cliffs on the Lirung Glacier, Nepal Himalayas, 1996 , 1998 .

[30]  Douglas I. Benn,et al.  Rapid growth of a supraglacial lake, Ngozumpa Glacier, Khumbu Himal, Nepal , 2000 .

[31]  John M. Reynolds,et al.  An overview of glacial hazards in the Himalayas , 2000 .

[32]  Jason E. Box,et al.  Remote sounding of Greenland supraglacial melt lakes: implications for subglacial hydraulics , 2007, Journal of Glaciology.

[33]  Manfred F. Buchroithner,et al.  Identification of glacier motion and potentially dangerous glacial lakes in the Mt. Everest region/Nepal using spaceborne imagery , 2008 .

[34]  A. K. Lohani,et al.  Glacial lakes and glacial lake outburst flood in a Himalayan basin using remote sensing and GIS , 2012, Natural Hazards.

[35]  Wouter Buytaert,et al.  Repeated glacial-lake outburst floods in Patagonia: an increasing hazard? , 2010 .

[36]  Koji Fujita,et al.  Role of supraglacial ponds in the ablation process of a debris-covered glacier in the Nepal Himalayas , 2000 .

[37]  E. Godin,et al.  Effects of thermo-erosion gullying on hydrologic flow networks, discharge and soil loss , 2014 .

[38]  W. Jian,et al.  Thermal regime of a supraglacial lake on the debris-covered Koxkar Glacier, southwest Tianshan, China , 2012, Environmental Earth Sciences.

[39]  C. Warren,et al.  Tasman Glacier, New Zealand: 20th-century thinning and predicted calving retreat , 1999 .