新疆和周边“一带一路”地区不同云天条件下地表太阳辐射

Analysis of surface solar radiation under different cloud conditions in Xinjiang and the surrounding “Belt and Road” regions

基于CERES Aqua FM3 Edition4A SSF数据集,对新疆和周边“一带一路”地区2002—2022年无云和有云条件下地表太阳辐射时空变化特征进行分析。结果表明:(1)研究区多年平均太阳辐射高值区均出现在新疆南部、青藏高原、巴基斯坦中北部等地区,无云、有云条件下的最高辐照度分别为1029 W·m^(-2)、789 W·m^(-2);低值区主要出现在天山山脉、巴基斯坦北部、塔吉克斯坦北部,最低辐照度分别为117 W·m^(-2)、314 W·m^(-2),有云条件下太阳辐射的变化幅度更小。(2)2002—2022年研究区无云与有云条件的年均太阳辐射分别以0.36 W·m^(-2)、0.39 W·m^(-2)的速率增长。2003—2022年,无云与有云条件下年均辐照度的最高值分别出现在2005年(759.32 W·m^(-2))、2016年(599.70 W·m^(-2)),最低值分别出现在2016年(740.43 W·m^(-2))、2010年(578.31 W·m^(-2))。(3)无云条件下大部分区域的辐照度比有云时高100~200 W·m^(-2),差值较大的区域主要分布于天山山脉、青藏高原北部、昆仑山脉、喜马拉雅山脉、塔吉克斯坦、阿富汗东部等地势较高的地区,差值最大为505.76 W·m^(-2)。

The spatial-temporal changes in surface solar radiation from 2002 to 2022 in Xinjiang and the surrounding“Belt and Road”regions under cloudless and cloudy conditions were compared using the CERES Aqua FM3 Edition4A SSF data set.Under both cloud conditions,the annual mean surface solar radiation was highest in the southern Xinjiang,Qinghai-Xizang Plateau,and central and northern Pakistan.The maximum irradiance under cloudless and cloudy conditions was 1029 W·m^(-2) and 789 W·m^(-2),respectively.The regions of lowest solar irradiance,with the lowest values being 117 W·m^(-2) under cloudless and 314 W·m^(-2) under cloudy conditions,are primarily located in Tianshan Mountains,northern Pakistan,and northern Tajikistan.These figures indicate that the variation in solar radiation is relatively smaller under cloudy conditions.The average annual solar radiation in the study area for cloudless and cloudy conditions increased at the rate of 0.36 W·m^(-2) and 0.39 W·m^(-2) from 2002 to 2022,respectively.From 2003 to 2022,the highest values of annual average irradiance under cloudless and cloudy conditions occurred in 2005(759.32 W·m^(-2))and 2016(599.70 W·m^(-2)),respectively.The difference in solar radiation between the nine ground stations under cloud conditions(excluding Turpan and Altai stations)ranged from 50 to 150 W·m^(-2);the irradiance values at the remaining stations ranged from 150 to 250 W·m^(-2).The irradiance in most areas was 100-200 W·m^(-2) higher without cloud cover,and the regions where the difference is significant are primarily the Tianshan Mountains,northern Qinghai-Xizang Plateau,and Kunlun Mountain,with the largest difference of 505.76 W·m^(-2).