Himalayan Glacier Change Index

Himalaya Range Glacier Change Below is a list of individual glaciers in the Himalaya that illustrate what is happening glacier by glacier. In addition to the individual sample glaciers we tie the individual glaciers to the large scale changes of approximately 10,000 glaciers that have been examined in repeat satellite image inventories. In the Himalayan Range, stretching from the Karokaram Range in NW India east south east to the border region of Bhutan and China,  detailed glacier mapping inventories, from GLIMS: (Global Land Ice Measurements from Space), ICIMOD (International Centre for Integrated Mountain Development), ISRO ( Indian Space Research Organisation) and Chinese National Committee for International Association of Cryospheric Science (IACS) of thousands of glaciers have indicated increased strong thinning and area loss since 1990 throughout the the Himalayan Range. The inventories rely on repeat imagery from ASTER, Corona, Landsat, IKONOS and SPOT imagery. It is simply not possible to make observations on this number of glaciers in the field.  This is an update to the assessment by Pelto (2012) in the BAMS State of the Climate, which was the source of a Skeptical Science article as well

Kali Gandaki Headwaters, Nepal——–Ngozumpa Glacier, Nepal

Khumbu Glacier, Nepal ————         West Barun Glacier, Nepal 

Imja Glacier, Nepal ——–                       Nobuk Glacier, Nepal

Lumding Glacier, Nepal———-

Milam Glacier, India————                Samudra Tupa, India

Ratangrian Glacier, India———–       Khatling Glacier, India

Satopanth Glacier, India———-         Durung Drung Glacier, India

Gangotri Glacier, India————         Warwan Basin, India

Sara Umaga Glacier, India—–          Malana Glacier, India 

Jaonli Glacier, India——–                  Kalabaland Glacier, India  

Jaundhar Barak, India———–         Burphu Glacier, India

Changsang Glacier, Sikkim—–     Zemu Glacier, Sikkim 

South Lhonak Glacier, Sikkim——North Lhonak Glacier, Sikkim

Theri Kang Glacier, Bhutan———-Luggi Glacier, Bhutan

Mangde Chu Glacier, Bhutan——–Thorthormi Glacier, Bhutan

Menlung Glacier, Tibet———-       Yejyumaro Glacier, Tibet

Lumding Glacier, Tibet—-             Rongbuk Glacier, Tibet

Sepu Kangri, China———–          Longbasba Glacier, Tibet

Jiongla Glacier, Tibet———-        Bode Zanbo Headwaters, Tibet

Zayul Chu Headwaters, TibetBoshula Glaciers, Tibet

Matsang Tsanpo Gl, Tibet—–    Reqiang Glacier, Tibet 

Himalaya-Small

In Garhwal Himalaya, India, of 58 glaciers examined from 1990-2006 area loss was 6% (Bhambri et al, 2011). They also noted the number of glaciers increased from 69 (1968) to 75 (2006) due to the disintegration of ice bodies. Examination of 466 glaciers in the Chenab, Parbati and Baspa Basin, India found a 21% decline in glacier area from 1962 to 2004 (Kulkarni, 2007). Glacier fragmentation was also observed in this study, which for some fragments represents a loss of the accumulation area, which means the glacier will not survive (Pelto, 2010). The India glacier inventory (ISRO, 2010) identified glacier area losses and frontal change on 2190 glaciers and found an area loss rate of 3.3% per decade and 76% of glaciers retreating. (Kulkarni, 2014) reports on Indian Himalyan glaciers  that 79 of 80 with terminus change records have been receding.

In the Nepal Himalaya area loss of 3808 glaciers from 1963-2009 is nearly 20% (Bajracharya et al., 2011). The Langtang sub-basin is a small northeast-southwest elongated basin, tributary of Trishuli River north of Kathmandu and bordered with China to the north. The basin contained 192 km2 of glacier area in 1977, 171 km2 in 1988, 152 km2 in 2000 and 142 km2 in 2009. In 32 years from 1977 to 2009 the glacier area declined by 26% (Bajracharya et al., 2011). In the Khumbu region, Nepal volume losses increased from an average of 320 mm/yr 1962-2002 to 790 mm/yr from 2002-2007, including area losses at the highest elevation on the glaciers (Bolch et al., 2011).  The Dudh Koshi basin is the largest glacierized basin in Nepal. It has 278 glaciers of which 40, amounting to 70% of the area, are valley-type. Almost all the glaciers are retreating at rates of 10–59 m/year and the rate has accelerated after 2001 (Bajracharya and Mool, 2009).  ICIMOD (2013) completed an inventory of Nepal glaciers and found a 21% decline in area from the 1970’s to 2007/08.  ICIMOD has developed an  map viewer application for examining the changes through time.

An inventory of 308 glaciers in the Nam Co Basin, Tibet, noted an increased loss of area for the 2001-2009 period, 6% area loss (Bolch et al., 2010). Zhou et al (2009) looking at the Nianchu River basin southern Tibet found a 5% area loss. 1990-2005. In the Pumqu Basin, Tibet an inventory of 999 glacier from the 1974 & 1983 to 2001 indicated the loss of 9% of the glacier area and 10% of the glaciers disappeared (Jin et al, 2005). The high elevation loss is also noted in Tibet on Naimona’nyi Glacier which has not retained accumulation even at 6000 meters. This indicates a lack of high altitude snow-ice gain (Kehrwald et al, 2008).

A new means of assessing glacier volume is GRACE, which cannot look at specific changes of individual glaciers or watersheds. In the high mountains of Central Asia GRACE imagery found mass losses of -264 mm/a for the 2003-2009 period (Matsuo and Heki, 2010). This result is in relative agreement with the other satellite image assessments, but is at odds with the recent global assessment from GRACE, that estimated Himalayan glacier losses at 10% of that found in the aforementioned examples for volume loss for the 2003-2010 period (Jacobs et al, 2012). At this point the detailed glacier by glacier inventories inventories of thousands of glaciers are better validated and illustrate the widespread significant loss in glacier area and volume, though not all glaciers are retreating. This page will continue to be updated as new inventory data is published and new individual glaciers are examined herein. Yao et al (2012) in an examination of Tibetan glaciers observed substantial losses of 7090 glaciers.  Bolch et al (2012) in a report on the “State and Fate of Himalayan Glaciers” noted that most Himalayan glacier are losing mass and retreating at rates similar to the rest of the globe.  ICIMOD has also developed an application illustrating changes of glaciers in Bhutan.

Lugge and Thorthormi Glacier Retreat, Bhutan

Luge and Thorthormi Glacier drain south from the border with China into the Pho Chu River in Bhutan. Both glaciers end in expanding glacier lakes that are prone to outburst floods, which sweep down the Pho Chu. Osti et al (2012) reported in detail on the nature of these floods, noting there are eight dangerous lakes including the two at the terminus of Lugge and Thorthormi Glacier, Thorthormi Cho and Lugge Cho. In 1994 Lugge Cho experienced a glacier lake outburst flood GLOF which incurred huge damage in the Pho Chu basin. The 1994 GLOF event had a peak discharge of about 2539 cubic meters/s and extended 200 km downstream as a flood wave Osti et al (2012) . The GLOF occurred after rapid retreat of Lugge Glacier from 1988-1993 of 160 m/year. pho chu ge
Google Earth Image
Here we examine the retreat of both glaciers in Landsat imagery from 2000-2014. In each image the red arrow indicates the 2000 terminus, the yellow arrow the 2014 terminus, the blue arrow the snowline on Lugge Glacier and the green arrow the center of the Thorthormi Glacier terminus in 2013. In 2000 the Lugge Glacier ends in a 2 km long Lugge Cho. The Thorthormi Glacier has pockets of proglacial lake in 2000, but also a debris covered terminus that extends across the lake basin to the Little Ice Age moraine (M). The two images from 2000 are from the start of October and late December. Note the snowline remains near 5100-5200 m in both images. The glaciers of Bhutan are summer accumulation type glaciers, in which the main accumulation season is during the summer monsoon. The snowline tends to rise from October into December with limited snowfall. By 2013 Lugge Glacier has retreated 1 km from the 2000 position, and Lugge Cho is now 3 km long. The terminus of Lugge Cho is not stagnant and it is not clear how much longer the deep basin extends under the glacier. If the basin does not extend much further retreat will soon be reduced. Thorthormi Glacier debris covered terminus connection to the moraine (M) has melted away and a lake extends across the full width of the glacier basin. The contiguous lake now has an area of over 1 square kilometer. The retreat of Thorthormi has been 700 m since 2000. The lowest 1 km of the glacier is stagnant and melt should be enhanced by calving into the lake, hence the retreat should remain quick in the next decade. The snowline in the Late November 2013 and early February 2014 image indicate the snowline at close to 5300 m in both. The retreat of these glaciers is leading to expansion of proglacial lakes much like the nearby Theri Kang and many other across the region Changsang Glacier, Sikkim, Lumding Glacier, Nepal Matsang Tsanpo, Tibet .
lugge 2000
2000 Landsat image
lugge 2000a
2000 Landsat image

lugge 2013
2013 Landsat image

lugge 2014
2014 Landsat image

Theri Kang Glacier Retreat Bhutan

One of the glaciers draining north from Theri Kang in Bhutan terminates in proglacial lake, that is a lake at the glacier front. This is an unnamed glaciers like its neighbors, we will refer to it as the Theri Kang Glacier. The glacier has retreated 1700 meters from the moraine complex that impound the lake. The terminus is at 5200 meters, the snowline is at 5800 meters and the summit of the glacier is near 6700 meters. The vegetation adjacent to the glacier is indicative of the overall dry climate in the region. This is also a cold climate with permafrost in the areas adjacent to the glacier. The lake is not in evidence in maps of the region from the 1960’s. Kääb (2005) in Figure 7b examined the velocity of this glacier using ASTER imagery he found that most of the lower glacier extending from where the tributaries join to the terminus moved at a velocity of 50 m per year. A comparison of this 2001 image overlain in Google Earth and the more recent 2009 imagery indicate this glacier has retreated 300 meters in eight years. The 2001 image is from NASA.The red line in the 2001 image indicates the 2009 terminus. The lake has expanded from 1500 meters in length to 1800 meters and now encompasses nearly 2 square kilometers. Often there is concern about glacier lake outburst floods from lakes dammed either by a glacier or impounded, as in this case, by its moraine. For the Theri Kang the moraine complex appears quite wide, and stable and is not of great concern. The 2013 Landsat image does not show significant retreat after 2009. theri kang 2013
2013 Landsat Image
The lower portion of the glacier is debris covered along the lateral margins, but the clean ice portion has an interesting pattern, that is typical of a glacier in a drier climate where sublimation is an important element of the ablation process, dominating over melting. Sublimation is the direct transfer of solid ice to water vapor without melting. That is the crevasse pattern becomes a series of prominent crests almost waves that persists in the absence of the crevasses that formed them. This persistence would not occur in a zone dominated by melting. Though the setting is much different the response to climate is the same as almost all Himalayan glaciers from the Zemu Glacier in Sikkim, to Lugge Glacier, Bhutan, to Imja Glacier in Nepal