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引用本文:德吉央宗,拉巴卓玛,拉巴,尼玛吉,陈涛.1975-2013年西藏佩枯错湖面变化及分析.湖泊科学,2016,28(6):1338-1347. DOI:10.18307/2016.0619
DEKEY Yangzom,LHABA Droma,LHABA,NIMA Key,CHEN Tao.Lake area variation of Peiku Tso(lake) in 1975-2013 and its influential factors. J. Lake Sci.2016,28(6):1338-1347. DOI:10.18307/2016.0619
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1975-2013年西藏佩枯错湖面变化及分析
德吉央宗1,2, 拉巴卓玛1,2, 拉巴1,2, 尼玛吉3, 陈涛1,2
1.中国气象局成都高原气象研究所拉萨分部, 拉萨 850001;2.西藏高原大气环境科学研究所, 拉萨 850001;3.西藏自治区气候中心, 拉萨 850001
摘要:
根据1975年地形图、1970s末至2013年19期Landsat(MSS、TM、ETM+)陆地资源卫星和20032009年ICESat卫星数据,以及近40年气象资料,对西藏佩枯错湖泊面积变化进行分析.结果表明,湖泊面积、湖泊高度变化波动较大,均呈减少和退缩趋势.19752013年间湖泊面积减少10.68 km2,减幅为3.79%.从空间动态变化来看,变化较明显的区域位于该湖的南岸和东北岸,南岸、东北岸湖岸线分别向北、向西南萎缩.20032009年湖面高度和湖泊面积均呈现出下降趋势,分别下降了0.17 m和4.4 km2.19992013年之间对该流域湖泊有影响的冰川变化分析显示,冰川呈现出退缩、面积减少趋势.数据显示冰川面积总共减少了17.17 km2,减少率为7.91%.自1971年以来,流域气温总体呈上升趋势,2000年以后升温显著.佩枯错43 a来降水量年际变化波动较大,年降水量呈减少趋势,总的来说降水量每10 a减少6.99 mm.虽然佩枯错属于降水和冰雪融水补给湖泊,但该流域湖面增减与周围冰川变化的关系并不明显,与温度变化呈负相关,而与流域内降水量呈正相关.综合分析表明,佩枯错流域湖泊变化与冰川退缩关系不密切,降水量是湖泊变化的主要原因.
关键词:  佩枯错  湖面变化  湖面高度  ICESat卫星
DOI:10.18307/2016.0619
分类号:
基金项目:国家自然科学基金项目(41165003)和西藏自治区气象局高原遥感技术应用创新团队项目联合资助.
Lake area variation of Peiku Tso(lake) in 1975-2013 and its influential factors
DEKEY Yangzom1,2, LHABA Droma1,2, LHABA1,2, NIMA Key3, CHEN Tao1,2
1.Lhasa Branch of Chengdu Plateau Meteorological Research Institute of China, Meteorological Administration, Lhasa 850001, P. R. China;2.Tibet Institute of Plateau Atmospheric and Environmental Science Research, Lhasa 850001, P. R. China;3.Tibet Climate Center, Lhasa 850001, P. R. China
Abstract:
In this study, the variation in area of Peiku Tso in Tibet is investigated, mainly based on the topographic map in 1975, nineteen scenes of Landsat (MSS, TM, ETM+) satellite images beginning the late 1970s through 2013, ICESat satellite data during the period of 2003 to 2009, along with 43 years of meteorological data near the lake. Results show that the lake area experienced a decreasing trend, so did the elevation of lake. In particular, the area was reduced by 10.68 km2 (3.79%) during the period of 1975-2013. The spatial pattern concerning the times series of lake area maps indicates that the region with striking changes is located in the southern and the northeast part of Peiku Tso, where the water body shrinks toward north and southwest, respectively. Similarly, both the elevation and area of Peiku Tso exhibited a decreasing trend during the 2003-2009 years, respectively decreasing 0.17 m,4.4 km2. The annual mean temperature exhibited upward trend and the mean annual precipitation saw downward trend in the watershed of Peiku Tso during the last 40 years. The precipitation was positively related to the shrinkage of lake area, but negatively to the temperature. Therefore, we infer that the decreasing precipitation is likely to be the main factor of the lake shrinking. Considering the variation of the glaciers, the supply function of their melt water to the lake is not evident though the variation of the glaciers in the above basin exhibited degrading status as glaciers in other regions of the Tibetan Plateau.
Key words:  Peiku Tso(lake)  lake area change  lake elevation  ICESat satellite
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