2001-2020年川西高原积雪时空变化及影响因素分析研究

Spatio-temporal variation and influencing factors of snow cover in West Sichuan plateau from 2001 to 2020

基于MOD10A2数据对2001-2020年川西高原积雪的时空变化特征及其影响因素进行分析。结果表明:1)川西高原积雪覆盖率(SCP)年内分布呈双峰型周期变化趋势。2)2001-2020年来川西高原SCP整体呈缓慢减少的趋势。3)川西高原积雪覆盖频率(SCF)的空间分布差异明显,SCF随海拔的增高而增长,且迎风坡和阴坡的SCF高于背风坡和阳坡。4)整体上,川西高原SCF与气温总体相关性为负、与降水总体相关性为正。气温对积雪覆盖频率变化的影响更显著。

Based on MOD10 A2 data, the temporal and spatial variation characteristics of snow cover and its influencing factors in West Sichuan plateau from 2001 to 2020 were analyzed. The results show that: 1) The annual distribution of snow cover rate(SCP) in the West Sichuan plateau showed a bimodal periodic trend. 2) The SCP decreased slowly from 2001 to 2020. 3) The spatial distribution of snow cover frequency(SCF) was obviously different. SCF increased with altitude, and SCF in windward slope and shady slope was higher than that in leeward slope and sunny slope. 4) The correlation between SCF and temperature was negative, and the correlation between SCF and precipitation was positive. On the whole, the effect of temperature on snow cover frequency is more significant.