2000-2021年青藏高原地区地表净辐射的时空变化

Spatio-temporal Changes in Surface Net Radiation in the Qinghai-Tibet Plateau from 2000 to 2021

基于CERES卫星提供的2000年3月至2022年2月SYN1 deg–Level 3辐射数据,结合Theil-Sen Median趋势分析、Mann-Kendall检验以及EOF分析等方法,分析了22年间青藏高原地表净辐射的时空变化规律。研究发现,在空间分布特征上,青藏高原地表净辐射总体呈现南高北低的分布特征,地表净辐射变化趋势具有高度一致性,但在青藏高原南部地表净辐射变化量级远高于青藏高原北部;在时间演化特征上,地表净辐射呈现准正弦振动,年周期变化明显,特别是2016-2017年出现突变,下降约5.52 W·m^(–2),同期云覆盖度年平均值提高约18.75%。

Based on the SYN1 deg-Level 3 radiation product from the CERES satellite spanning from March 2000 to February 2022,The Theil-Sen Median trend analysis,Mann-Kendall test,and EOF anal-ysis were combined to investigate the spatiotemporal patterns of surface net radiation on the Qinghai-Tibet Plateau over the past 22 years.The study found that in terms of spatial distribution characteris-tics,the surface net radiation in the Qinghai-Tibet Plateau exhibits a general pattern of higher values in the southern region and lower values in the northern region.The variation trend of surface net radiation shows a high degree of consistency,but the fluctuation amplitude of it in the southern region of the Qinghai-Tibet Plateau is much higher than that in the northern region of the Qinghai-Tibet Plateau.Re-garding to the temporal evolution,the surface net radiation displayed quasi-sinusoidal oscillations with a noticeable annual periodicity.Notably,there was a sudden decrease of approximately 5.52 W·m^(–2) in the period from 2016 to 2017.Concurrently,there was an increase of about 18.75%in the cloud area frac-tion during the same period.