![]() Estimation on the response of glaciers in China to the global warming in the 21st century. Study on the glaciers variation and its runoff response in the arid region of Northwest China. Liu Chaohai, Kang Ersi, Liu Shiyin et al. Beijing: China Meteorological Press, 2003. An Assessment of the Issues of Climatic Shift from Warm-dry to Warm-wet in Northwest China. ![]() Shi Yafeng, Shen Yongping, Li Dongliang et al. Preliminary study on signal, impact and foreground of climatic shift from warm-dry to warm-humid in North China. Key words: the head of Yurungkax River, glacier, remote sensing, geographical information system It concludes that the enlargement of glaciers during 1970-1989 might be caused by the decrease in air temperature and the increase in precipitation during the 1960s and that glacier shrinkage during 1989-2001 might be reaction to increase in air temperature, but abundant precipitation acts as a role of buffer in variations of surface mass balance of glaciers in the research region. Results indicate that a small enlargement of ice extent during 1970-1989 was followed by a reduction of over 0.5% during 1989-2001. shows that the prevailing characteristic of glacier variation is ice wastage, however, changes in glacier area are very small in this region. A comparative analysis performed for glacier length/area variations since 1970 in the West Kunlun Mts. by using aerial photos (1970), Landsat TM (1989) and ETM+ (2001) imageries. In the present study, we investigate the changes of glaciers at the head of Yurungkax river (centered at 35o40'N, 81oE) in the heavily glaciated West Kunlun Mts. As of August, 2013, the GLIMS Glacier Database contains approximately 70% of the contents of the RGI, by both glacier count and area.Recent studies indicate that widespread wastage of glaciers in western China has happened since the late 1970s, but diverse places under different climate settings have marked regional discrepancy as to the amplitude in glacier shrinkages. This contribution discusses the status of the GLIMS Glacier Database and the merge of RGI data into GLIMS, showing how the merge is carried out. More data from the RGI, such as from Arctic Canada and the periphery of Greenland, are expected to be merged into GLIMS as resources at NSIDC allow and as sufficient metadata can be obtained. The New Zealand outlines came from the Randolph Glacier Inventory (RGI), a data set created with the express purpose of filling the geographic gaps in GLIMS to produce a globally complete map of glaciers. These outlines had significant overlap with existing outlines in the GLIMS database, necessitating new approaches to the merging process. New sets of glacier outlines, including 12000 outlines from the Western Himalaya and 3500 outlines from New Zealand, have recently been merged into GLIMS. Otherwise, outlines that are supposed to pertain to the same glacier will appear to be different glaciers, causing errors in summary statistics of the database, such as glacier count or area. As new glacier outlines are produced for glaciers which have already been mapped within GLIMS, we must ensure that each new outline is assigned the same GLIMS glacier ID as its previous outline. GLIMS is one of the most popular data sets at NSIDC, and a web-based map interface and web map services allow users to obtain the data at no cost. The Global Land Ice Measurements from Space (GLIMS) glacier database was built at the National Snow and Ice Data Center (NSIDC) in 2005, and now contains outlines and metadata for 120,000 glaciers.
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