近日，兰州大学刘玉芝团队取得一项新突破，他们提出了一个新的合并产品揭示了中国旱地降水特征。2024年3月8日出版的《大气科学进展》发表了这项成果。

由于描述中国旱地降水时空分布的数据集存在较大的不确定性，本研究提出了一个用于1980-2019年期间，新的合并月降水量的产品，其空间分辨率约为0.2°× 0.2°(纬度×经度)。

研究人员表示，新开发的降水产品在不同的时间尺度(如月、季、年)上进行了验证。结果表明，新产品与中国气象局土地资料同化系统(CLDAS)产品和多时段加权集合降水(MSWEP)报告的时空分布基本一致。相对于MSWEP每月的偏差为-2.19毫米，合并后的产品在描述中国旱地方面表现优异。此外，合并产品的年趋势(每年为每月0.09毫米)也与1980-2019年期间MSWEP的年趋势(每年为每月0.11毫米)高度一致。

增加趋势表明，这一时期中国旱地的水循环和湿润过程加剧。特别是，2001年至2019年期间，湿润现象有所增加。总的来说，合并后的产品对提高研究人员对中国旱地气候和水循环的认识具有潜在的价值。

附：英文原文

Title: A New Merged Product Revealed Precipitation Features over Drylands in China

Author: Min Luo, Yuzhi Liu, Jie Gao, Run Luo, Jinxia Zhang, Ziyuan Tan, Siyu Chen, Khan Alam

Issue&Volume: 2024-03-08

Abstract: Due to the considerable uncertainties inherent in the datasets describing the spatiotemporal distributions of precipitation in the drylands of China, this study presents a new merged monthly precipitation product with a spatial resolution of approximately 0.2° × 0.2° (latitude × longitude) during the period of 1980–2019. The newly developed precipitation product was validated at different temporal scales (e.g., monthly, seasonally and annually). The results showed that the new product aligned consistently with the spatiotemporal distributions reported by the Chinese Meteorological Administration Land Data Assimilation System (CLDAS) product and Multi-Source Weighted Ensemble Precipitation (MSWEP). The merged product exhibited exceptional quality in describing the drylands of China, with a bias of -2.19 mm/month relative to MSWEP. In addition, the annual trend of the merged product (0.09 mm/month per year) also closely aligns with that of the MSWEP (0.11 mm/month per year) during 1980–2019. The increasing trend indicates that the water cycle and wetting process intensified in the drylands of China during this period. In particular, there was an increase in wetting during the period from 2001–2019. Generally, the merged product exhibits potential value for improving our understanding of the climate and water cycle in the drylands of China.

DOI: 10.1007/s00376-024-3159-1

Source: http://www.iapjournals.ac.cn/aas/en/article/doi/10.1007/s00376-024-3159-1viewType=HTML