Validation and Spatiotemporal Analysis of Surface Net Radiation from CRA/Land and ERA5-Land over the Tibetan Plateau
Validation and Spatiotemporal Analysis of Surface Net Radiation from CRA/Land and ERA5-Land over the Tibetan Plateau
复制标题
DOI：
10.3390/atmos14101542
复制
发表时间：
2023-10
期刊：
影响因子：
2.9
通讯作者：
Limimg Gao;Yaonan Zhang;Lele Zhang
中科院分区：
文献类型：
--
作者：
Limimg Gao;Yaonan Zhang;Lele Zhang
高时空分辨率地表净辐射(RN)资料对研究青藏高原气候、生态、水文和冰冻圈变化具有重要意义，但对高原地表净辐射产物的验证还不够充分。本研究利用中国气象局全球陆面再分析产品(CRA/LAND)和欧洲气象局陆面再分析第5版(ERA5-LAND)RN资料，对逐日和逐月地面观测资料进行了验证，并对其时空格局进行了分析。结果表明：(1)在日尺度和月尺度上，CRA/LAND高估了RN，而ERA5-LAND低估了RN，但CRA/LAND RN优于ERA5-LAND。(2)CRA/LAND RN数据在TP中部误差较大，东北部误差较小，而ERA5-LAND则相反。(3)CRA/LAND和ERA5-LAND数据揭示的RN空间格局在大部分地区存在差异。CRA/LAND数据表明，2000年至2020年期间，TP的RN呈下降趋势，斜率为−0.112 W·m−2/a，而ERA5-LAND数据呈上升趋势，变化率为0.016 W·m−2/a。(4)下行短波辐射、上行短波辐射、下行长波辐射和上行长波辐射是RN的四个分量，评价结果表明，由CRA/LAND和ERA5-LAND记录的DSR、DLR和ULR与观测数据基本一致。但通过CRA/LAND和ERA5-LAND记录的USR与观测数据的一致性较差。(5)USR数据的不一致性是造成CRA/LAND和ERA5-LAND RN数据在TP上时空分布差异较大的主要原因。
High spatial–temporal resolution surface net radiation (RN) data are of great significance to the study of climate, ecology, hydrology and cryosphere changes on the Tibetan Plateau (TP), but the verification of the surface net radiation products on the plateau is not sufficient. In this study, the China Meteorological Administration Global Land Surface Reanalysis Products (CRA/Land) and ECMWF Land Surface Reanalysis version 5 (ERA5-Land) RN data were validated using ground measurements at daily and monthly time scales, and the spatiotemporal patterns were also analyzed. The results indicate the following: (1) CRA/Land overestimated while ERA5-Land underestimated RN, but CRA/Land RN outperformed ERA5-Land in observations at the daily and monthly scale. (2) The CRA/Land RN data had a larger error in the central part and a smaller error in the northeast of the TP, while ERA5-Land showed the opposite. (3) The spatial patterns of RN revealed by CRA/Land and ERA5-Land data showed differences in most regions. The CRA/Land data showed that the RN of the TP had a downward trend during 2000 and 2020 with a slope of −0.112 W·m−2/a, while the ERA5-Land data indicated an upward trend with a change rate of 0.016 W·m−2/a. (4) Downwelling shortwave radiation (DSR), upwelling shortwave radiation (USR), downwelling longwave radiation (DLR) and upwelling longwave radiation (ULR) are the four components of RN, and the evaluation results indicate that the DSR, DLR and ULR recorded via CRA/Land and ERA5-Land are consistent with the observed data, but the consistency between the USR recorded via CRA/Land and ERA5-Land and the observed data is poor. (5) The inconsistency of the USR data is the main reason for the large differences in the spatiotemporal distribution of CRA/Land and ERA5-Land RN data across the TP.