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Evaluation of ERA5 precipitation over the eastern periphery of the Tibetan plateau from the perspective of regional rainfall events
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-12-24 , DOI: 10.1002/joc.6980
Xuelin Hu 1, 2 , Weihua Yuan 1
Affiliation  

The eastern periphery of the Tibetan Plateau (EPTP), which connects the Tibetan Plateau in the west and the Sichuan Basin in the east, is a typical area with steep terrain. The performance of the ERA5 reanalysis data in revealing the regional rainfall events (RREs) over the EPTP was evaluated by conducting a comparison with the rain‐gauge data. The results showed that the ERA5 precipitation could capture the general spatiotemporal features of the evolution of the observed RREs with spatial correlation coefficients greater than 0.8, but obvious bias still existed. The rainfall frequency was generally greater and the rainfall intensity was weaker in the ERA5 precipitation from the Tibetan Plateau to the Sichuan Basin, with the rainfall amount being smaller over the EPTP and Sichuan Basin and larger over the eastern Tibetan Plateau. ERA5 precipitation tended to start earlier and end later relative to the RREs in the gauge data. During the RREs, the distribution of the precipitation intensity in ERA5 was weaker and more uniform than that of the gauge records, and the spatial ranges were larger, which responded well to the higher rainfall frequency but weaker intensity in ERA5 when compared with the gauge data. These findings remind us that attention should be paid when using reanalysis precipitation, especially over complex terrain such as that of the EPTP. Moreover, the incorrect timing of the ERA5 precipitation and the underestimation of the precipitation intensity indicated that problems still exist in the state‐of‐the‐art model system.

中文翻译:

从区域降雨事件的角度评估青藏高原东缘的ERA5降水

青藏高原的东部边缘连接着西部的青藏高原和东部的四川盆地,是典型的地形陡峭的地区。通过与雨量计数据进行比较,评估了ERA5再分析数据在揭示EPTP上的区域降雨事件(RRE)方面的性能。结果表明,ERA5降水可以捕获观测到的RRE演化的一般时空特征,空间相关系数大于0.8,但仍然存在明显的偏差。在青藏高原到四川盆地的ERA5降水中,降雨频率普遍较大,而降雨强度较弱,其中EPTP和四川盆地的降水量较小,而青藏高原东部的降水量较大。相对于轨距数据中的RRE,ERA5降水倾向于开始得更早,结束得更晚。在RREs期间,ERA5的降水强度的分布比标准记录的要弱和均匀,并且空间范围较大,与较高的降雨频率相比,响应较高的降雨频率,但ERA5的强度较标准的记录要弱。这些发现提醒我们,在使用再分析降水时,尤其是在诸如EPTP之类的复杂地形上,应引起注意。此外,ERA5降水的时机不正确和降水强度的低估表明,最新模型系统中仍然存在问题。ERA5降水强度的分布较规范记录弱且更均匀,空间范围较大,与较高的降雨频率响应较好,但与规范数据相比,ERA5的强度较弱。这些发现提醒我们,在使用再分析降水时,尤其是在诸如EPTP之类的复杂地形上,应引起注意。此外,ERA5降水的时机不正确和降水强度的低估表明,最新模型系统中仍然存在问题。ERA5降水强度的分布较规范记录弱且更均匀,空间范围较大,与较高的降雨频率响应较好,但与规范数据相比,ERA5的强度较弱。这些发现提醒我们,在使用再分析降水时,尤其是在诸如EPTP之类的复杂地形上,应引起注意。此外,ERA5降水的时机不正确和降水强度的低估表明,最新模型系统中仍然存在问题。这些发现提醒我们,在使用再分析降水时,尤其是在诸如EPTP之类的复杂地形上,应引起注意。此外,ERA5降水的时机不正确和降水强度的低估表明,最新模型系统中仍然存在问题。这些发现提醒我们,在使用再分析降水时,尤其是在诸如EPTP之类的复杂地形上,应引起注意。此外,ERA5降水的时机不正确和降水强度的低估表明,最新模型系统中仍然存在问题。
更新日期:2020-12-24
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