【摘要】 利用MODIS和微波遥感数据产品提取的阿尔泰山积雪深度、积雪覆盖度和积雪时数，结合时空三极数据中心提供的气温和降水数据，对阿尔泰山积雪时空动态与气候变化的关系进行研究。结果表明：在2010至2020年间，阿尔泰山积雪深度、积雪覆盖度和积雪时数分别以0.22 cm/a、0.78%/a和2.83 d/a的速率减少，表现为东南高、西北低的空间格局，在海拔2 000 m以下的区域，积雪减少最显著；阿尔泰山气候表现出暖干化趋势，自东南向西北方向暖干化减弱，降水减少速率从1.33 mm/a降低至0.13 mm/a，增温速率由0.44℃/a降至0.21℃/a。垂直地带规律上，低于海拔2 500 m的区域表现为暖干化，2 500 m以上区域呈暖湿化趋势。降水减少是积雪减少的主要驱动因素，海拔2 500 m以下区域的积雪深度和积雪覆盖度受气温升高和降水减少显著降低，自东南向西北方向，降水减少对积雪深度和积雪覆盖度的影响逐渐减弱。更多还原

【Abstract】 The relationship between the spatiotemporal variations of snow cover and climate change in the Altay Mountains was studied by using snow depth(SD),snow coverage fraction(SCF)and snow cover days(SCD)extracted from MODIS and microwave remote sensing data products from 2010 to 2020,combined with the temperature and precipitation data provided by the space-time tripole data center.The results showed that SD,SCF and SCD in the Altai Mountains decreased at a rate of 0.22cm/a,0.78 %/a and 2.83 d/a from 2010 to 2020,respectively,showing a spatial pattern of high in the southeast and low in the northwest. The snow cover decreased most significantly in areas below 2 000 m altitude. The climate of the Altai Mountains showed a warming and drying trend,and the warming and drying weakened from southeast to northwest. The precipitation reduction rate decreased from 1.33 mm/a to 0.13 mm/a,and the warming rate decreased from 0.44°C/a to 0.21°C/a. In terms of elevation,2 500 meters was identified as a critical threshold,with warming & drying conditions below this altitude,and warming & moistening conditions above this altitude.Precipitation reduction was identified as the primary driver of snow degradation. SD and SCF below 2 500 meters significantly decreased with rising temperatures and decreasing precipitation,and the influence of precipitation reduction on SD and SCF decreased from southeast to northwest.更多还原