The snowmelt of the Greenland ice sheets is of great significance to the study of global climate change. This paper is based on the 19.35 GHz horizontal polarization data and 37.00 GHz vertical polarization data of the Special Sensor Microwave/ Imager Sounder (SSMIS) and Special Sensor Microwave/ Image (SSM/I) carried by National Defense Meteorological Satellite Program (DMSP) from 1988 to 2016, by cross-polarization ratio (XPGR) algorithm (threshold value is -0.0158). The inter-annual trends of snowmelt area, annual average snowmelt onset, end date and duration in Greenland were studied. The results showed that the maximum snowmelt area was 2,080,000 km² in 2012, and the minimum was 1,115,000 km² in 1992. From 1988 to 2016, the snowmelt area of the Greenland ice sheets was increased by 2.8×10⁵ km², with a growth rate of 9.66×10³ km²/year. In the annual average change rate, there were earlier snowmelt onset date (0.16 days earlier each year), longer snowmelt duration (0.36 days longer each year) and later snowmelt end date (0.06 days later each year), and the snowmelt area was in the marginal region. The snowmelt area of the southern margin is the largest, and there are obvious regional differences. The snowmelt of Greenland ice sheets changes greatly and shows a periodic change rule in the annual mean snowmelt variation.

中文翻译：

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基于SSM/I（SSMIS）数据的格陵兰冰盖融雪时空变化（1988-2016）

格陵兰冰盖融雪对全球气候变化研究具有重要意义。本文基于国防气象卫星计划（DMSP）携带的特殊传感器微波/成像测深仪（SSMIS）和特殊传感器微波/图像（SSM/I）的19.35 GHz水平极化数据和37.00 GHz垂直极化数据。 1988年到2016年，通过交叉极化比（XPGR）算法（阈值为-0.0158）。研究了格陵兰融雪面积、年平均融雪开始、结束日期和持续时间的年际变化趋势。结果表明，2012年融雪面积最大为208万km ²，最小为111.5万km ²1992年。1988年至2016年，格陵兰冰盖融雪面积增加了2.8×10 ⁵ km ²，增长率为9.66×10 ³ km ² /年。在年平均变化率中，融雪开始日期较早（每年提前 0.16 天）、融雪持续时间较长（每年增加 0.36 天）和融雪结束日期较晚（每年推迟 0.06 天），融雪面积处于边缘区域。南缘融雪面积最大，区域差异明显。格陵兰冰盖融雪量变化较大，年平均融雪量变化呈现周期性变化规律。