1995-2015年全球不同气候带典型冰川补给型湖泊动态变化

Dynamic changes of typical glacier-fed lakes in different climatic zones around the world from 1995 to 2015

  • 摘要: 基于1995年、2005年和2015年3期Landsat影像数据,利用遥感和地理信息系统技术,分析全球不同气候带典型冰川补给型湖泊面积、数量及其对气候变化的响应。结果表明:①1995-2015年全球典型冰川补给型湖泊面积增加了2.32%,数量减少了2.26%,其中以小型湖泊(< 1 km2)和大型湖泊(>50 km2)面积变化最为剧烈,中型湖泊(1~50 km2)面积则相对稳定,1995-2005年冰川补给型湖泊面积与数量的变化速率相比2005-2015年较快。②1995-2015年热带、亚热带、温带冰川补给型湖泊面积与数量均在增加,其中以热带冰川补给型湖泊变化最为剧烈,其面积上升了20.62%,数量上升了25.32%,亚寒带与寒带冰川补给型湖泊面积与数量均减少,其中以寒带冰川补给型湖泊变化最为明显,其面积减少了11.3%,数量下降了18.97%。可为全球典型冰川补给型湖泊的变化及其影响因素的后续研究提供依据和参考。

     

    Abstract: Based on Landsat images captured in 1995, 2005 and 2015, a study was conducted in this paper on the typical glacier-fed lakes located in different climatic zones globally for their area, quantity and response to climate change, with the assistance of RS (Remote Sensing) and GIS(Geographic Information System). The results showed that:① The area of globally typical glacier-fed lakes increased by 2.32%, but the number of them declined by 2.26% during the period from 1995 to 2015. The area of small (< 1 km2) and great lakes(>50 km2) showed the most significant changes, while those medium-size lakes(1-50 km2) were shown to be relatively stable, with the area and number of glacier-fed lakes changing at a faster pace than in the period from 2005 to 2015.② The area and number of glacier-fed lakes in tropical, subtropical and temperate zones exhibited an increasing trend from 1995 to 2015. Particularly, the glacier-fed lakes in tropical zone showed the most significant change as the area covered by them increased by 20.62% and the number of them rose 25.32%. By contrast, the area and number of glacier-fed lakes in subfrigid zone and frigid zone exhibited a decreasing trend. More specifically, the glacier-fed lakes in frigid zone showed the most evident change as the area and number of glacier-fed lakes in frigid zone was reduced by 11.3% and 18.97%, respectively. This paper provides basis and reference for subsequtial studies on the changes to glacier-fed lakes and the influencing factors for these changes.

     

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