基于ITPCAS数据的青藏高原太阳总辐射时空变化特征

SPATIAL AND TEMPORAL CHARACTERISTICS OF GLOBAL SOLAR RADIATION OVER QINGHAI-TIBETAN PLATEAU BASED ON ITPCAS DATASET

利用青藏高原观测站数据对ITPCAS太阳总辐射数据进行评价,并基于ITPCAS数据分析青藏高原总辐射的时空变化特征。结果表明:ITPCAS总辐射数据与观测数据具有很好的一致性,能反映出青藏高原总辐射的时空变化特征。青藏高原年平均总辐射高值中心位于西藏西南部和青海柴达木盆地,低值中心位于高原东部的四川盆地和藏东南地区,高值和低值中心随季节变化发生变动。1999年之前,青藏高原总辐射整体表现为减小趋势,减小幅度约4.86 MJ/(m^2·a);2000年之后表现为上升趋势,上升幅度约8.03 MJ/(m^2·a)。从空间分布上来看,1999年之前高原西部和东南部少部分区域总辐射呈现出明显的上升趋势,其他大部分区域呈现出下降趋势或变化趋势不明显;2000年之后除高原西部和东部部分区域总辐射表现为明显的减小趋势,其他大部分区域均表现为上升趋势。

The ITPCAS global solar radiation data are evaluated by using the observed data,and the spatial and temporal characteristics of the global radiation are analyzed over the Qinghai-Tibetan plateau based on ITPCAS dataset.The results show that the ITPCAS global radiation data are in good agreement with observed data,and can reflect the spatial and temporal variation characteristics of surface solar radiation on the Tibetan plateau.The high value center of global solar radiation on the Qinghai-Tibetan plateau lies in the southwest of Tibet and the Qaidam Basin of Qinghai,and the low value center is located in the Sichuan basin and the Southeast Tibet area in the eastern part of the plateau,the center of high value and low value fluctuate with the season.Before 1999,the global solar radiation of the Tibetan plateau showed a decreasing trend and the rate is about 4.86 MJ/(m^2·a).After 2000,it was shown as an upward trend and the rate is about 8.03 MJ/(m^2·a).In terms of spatial distribution,the global solar radiation in some areas of the western and southeast parts of the plateau showed an obvious upward trend before 1999,and most of the other regions showed downward or no obvious trend.After 2000,except for the global solar radiation in part of the western and eastern part of the plateau showed an obvious decreasing trend,most of the other regions showed an upward trend.