Repeat surveys by aircraft laser altimeter in 1993/4 and 1998/9 reveal significant thinning along 70% of the coastal parts of the Greenland ice sheet at elevations below about 2000 m. Thinning rates of more than 1 m/yr are common along many outlet glaciers, at all latitudes and, in some cases, at elevations up to 1500 m. Warmer summers along parts of the coast may have caused a few tens of cm/yr additional melting, but most of the observed thinning probably results from increased glacier velocities and associated creep rates. Three glaciers in the northeast all show patterns of thickness change indicative of surging behavior, and one has been independently documented as a surging glacier. There are a few areas of significant thickening (over 1 m/yr), and these are probably related to higher than normal accumulation rates during the observation period.
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机译：1993/4年和1998/9年飞机激光高度计的重复调查显示，格陵兰冰盖沿岸70％的海拔高度在2000 m以下明显变薄。在所有纬度，在某些情况下，最高海拔1500 m，许多出口冰川的稀疏率通常都在1 m / yr以上。沿海部分地区较温暖的夏季可能导致数十厘米/年的额外融化，但观察到的大部分变薄可能是由于冰川速度增加和相关的蠕变速率造成的。东北部的三座冰川都显示出厚度变化的模式，这表明了涌动的行为，其中一个被独立记录为涌动的冰川。有一些明显增厚的区域（超过1 m / yr），这可能与观测期内高于正常的蓄积率有关。
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