Can Satellite or Reanalysis Precipitation Products Depict the Location and Intensity of Rainfall at Flash Flood Scale Over the Eastern Mountainous Area of the Tibetan Plateau?

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES Water Resources Research Pub Date : 2024-11-12 DOI:10.1029/2024wr037381
Yuqiao Feng, Youcun Qi, Zhanfeng Zhao, Donghuan Li
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Abstract

This study conducted evaluation and analysis on various precipitation products over the eastern Tibetan Plateau (ETP), including four sets of satellite precipitation data (i.e., IMERG_Uncal, IMERG_Cal, GSMaP_MVK, GSMaP_Gauge) and one set of model reanalysis data (i.e., ERA5-land, hereafter ERA5-L). We evaluated the spatial-temporal distribution of their quality at an hourly temporal scale and 0.1° spatial scale, with a special focus on capturing different types of precipitation. The results show that: (a) GSMaP_Gauge exhibits the highest correlation with ground-based gauges, while IMERG_Uncal and IMERG_Cal perform best in the estimation of the amount of precipitation. Satellite products generally perform better during summer while ERA5-L sometimes outperforms satellite products in spring and autumn. (b) The evaluation results for different precipitation types reveal that all the QPE products face significant challenges in accurately describing convective precipitation. They tend to underestimate convective precipitation and fail to properly capture the intensity and location of heavy precipitation. (c) In heavy convective precipitation cases, the evaluated QPE products show various issues in accurately capturing the intensity and spatiotemporal variation of precipitation. Almost all QPE products underestimate maximum precipitation (both hourly precipitation and accumulated precipitation) and small-scale (about 50 km or less) spatial variability of precipitation. IMERG_Uncal, IMERG_Cal, and GSMaP_MVK perform better than other products in heavy convective precipitation cases. This study provides new insights into the quality of QPE products in different types of precipitation. The analysis of the quality of these QPE products serves as a valuable indicator of their potential applications, particularly in flash flood simulations, while also underscoring the critical need for improving precipitation product quality.
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卫星或再分析降水产品能否描述青藏高原东部山区山洪规模降雨的位置和强度?
本研究对青藏高原东部的各种降水产品进行了评估和分析,包括四套卫星降水资料(即IMERG_Uncal、IMERG_Cal、GSMaP_MVK、GSMaP_Gauge)和一套模式再分析资料(即ERA5-land,以下简称ERA5-L)。我们以每小时的时间尺度和 0.1° 的空间尺度对其质量的时空分布进行了评估,重点是捕捉不同类型的降水。结果表明(a) GSMaP_Gauge 与地面测量仪的相关性最高,而 IMERG_Uncal 和 IMERG_Cal 在估计降水量方面表现最佳。卫星产品在夏季的表现一般较好,而ERA5-L 在春季和秋季的表现有时优于卫星产品。(b) 不同降水类型的评估结果显示,所有 QPE 产品在准确描述对流降水方面都面临重大挑战。它们往往低估了对流降水,未能正确捕捉强降水的强度和位置。(c) 在强对流降水情况下,评估的 QPE 产品在准确捕捉降水强度和时空变化方面存在各种问题。几乎所有 QPE 产品都低估了最大降水量(包括每小时降水量和累积降水量)和降水的小尺度(约 50 公里或更小)空间变化。在强对流降水情况下,IMERG_Uncal、IMERG_Cal 和 GSMaP_MVK 的表现优于其他产品。这项研究为了解不同类型降水中 QPE 产品的质量提供了新的视角。对这些 QPE 产品的质量分析是衡量其潜在应用(尤其是在山洪模拟中)的重要指标,同时也强调了提高降水产品质量的迫切需要。
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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