Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2021.105574 |
A downscaling approach for constructing a high-resolution precipitation dataset over the Tibetan Plateau from ERA5 reanalysis | |
Yaozhi Jiang, Kun Yang, Changkun Shao, Xu Zhou, ... Hui Wu | |
2021-03-10 | |
发表期刊 | Atmospheric Research
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出版年 | 2021 |
英文摘要 | Current gridded precipitation datasets are hard to meet the requirements of hydrological and meteorological applications in complex-terrain areas due to their coarse spatial resolution and large uncertainties. High-resolution atmospheric simulations are capable of describing the influence of topography on precipitation but are difficult to be used to obtain long-term precipitation datasets because they are computationally expensive, while reanalysis data has a long-term coverage and can provide reasonable large-scale spatial and temporal variability of precipitation. This study presents an approach to obtain long-term high-resolution precipitation datasets over complex-terrain areas by combining the ERA5 reanalysis with short-term high-resolution atmospheric simulation. The approach consists of two main steps: first, the ERA5 precipitation is corrected by the high-resolution simulation at the coarse spatial resolution; second, the corrected data is downscaled using a convolution neural network (CNN) based model at daily scale. The proposed approach is applied to the Tibetan Plateau (TP). The downscaled results from ERA5 have a finer spatial structure than ERA5 and can reproduce the spatial patterns of precipitation revealed by the high-resolution simulation. An evaluation based on rain gauge data shows that the downscaled ERA5 has remarkably lower biases than the original ERA5 which overestimates precipitation a lot, and even higher accuracy than the high-resolution simulation data over the TP. The downscaled ERA5 preserves the temporal characteristics of ERA5 which are more consistent with the rain gauge data than that of high-resolution simulation. Since this approach is much less computing resources consuming than the high-resolution simulation, it is an effective method to obtain long-term high-resolution precipitation datasets in complex-terrain areas and is expected to have extensive applications. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/318540 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Yaozhi Jiang, Kun Yang, Changkun Shao, Xu Zhou, ... Hui Wu. A downscaling approach for constructing a high-resolution precipitation dataset over the Tibetan Plateau from ERA5 reanalysis[J]. Atmospheric Research,2021. |
APA | Yaozhi Jiang, Kun Yang, Changkun Shao, Xu Zhou, ... Hui Wu.(2021).A downscaling approach for constructing a high-resolution precipitation dataset over the Tibetan Plateau from ERA5 reanalysis.Atmospheric Research. |
MLA | Yaozhi Jiang, Kun Yang, Changkun Shao, Xu Zhou, ... Hui Wu."A downscaling approach for constructing a high-resolution precipitation dataset over the Tibetan Plateau from ERA5 reanalysis".Atmospheric Research (2021). |
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