A need to monitor precipitation extremes from space is widely recognized, especially for regions where ground-based observations are limited or unavailable. This article examines the usefulness of precipitation extremes monitoring using the Global Satellite Mapping of Precipitation (GSMaP) near-real-time product in the East Asia and Western Pacific region—one of the world's most disaster-prone regions. With case studies and statistical analysis, heavy rainfall and drought detected using the GSMaP Near-real-time Gauge-adjusted Rainfall Product (GNRT6) were validated. Heavy rainfall for daily and weekly precipitation and short-term drought from one month up to three months were defined by a 90th percentile threshold or more and the Standardized Precipitation Index over periods from April 2000 to March 2019, respectively. The results of analyses suggested that the detectability varied depending on the region, such as good detection in dry areas and poor detection in rainy island nations. While the accuracy of GNRT6 is confirmed as being generally better than that of the satellite-only uncorrected product, low detectability can be caused by coarse resolutions of parameters used in the gauge-adjustment technique of the GNRT6 and is regarded as a future task.

中文翻译：

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使用近实时 GSMAP 产品监测极端降水

人们普遍认识到需要从空间监测极端降水，尤其是在地面观测有限或无法获得的地区。本文研究了在东亚和西太平洋地区（世界上最容易发生灾害的地区之一）使用全球降水卫星测绘 (GSMaP) 近实时产品监测极端降水的有效性。通过案例研究和统计分析，使用 GSMaP 近实时雨量表调整降雨产品 (GNRT6) 检测到的强降雨和干旱得到了验证。2000 年 4 月至 2019 年 3 月期间的每日和每周降水的强降雨以及 1 个月至 3 个月的短期干旱分别由 90% 或更高的阈值和标准化降水指数定义。分析结果表明，可探测性因地区而异，例如在干燥地区探测良好，在多雨岛国探测较差。虽然 GNRT6 的精度被确认为普遍优于纯卫星未校正产品的精度，但 GNRT6 的轨距调整技术中使用的参数分辨率粗糙可能会导致低可探测性，这被视为未来的任务。