Recently, ECMWF has released a new generation of reanalysis, acknowledged as ERA5, able to deliver a comprehensive, free, and operative picture of the past weather, exploiting the data assimilation of historical observations from different sources (satellite, in situ, multiple variables) for both atmospheric and soil variables. Experiences concerning flooding issues suggest that ERA5 could support also landslide investigations. In this sense, a number of questions may be raised: (i) can ERA5 data be reliable in reproducing rainfall histories leading to a landslide event? (ii) can ERA5 soil moisture estimations be reliable proxies for antecedent slope wetness condition? (iii) can ERA5 be implemented in a landslide early warning system to improve the performances? This study tries addressing these questions referring to some historical Campanian events (Southern Italy) with a special focus on the fully investigated event occurred in Nocera Inferiore on March 4, 2005. The study shows the following: (i) ERA5 precipitation can appropriately reproduce actual rainfall histories leading to the events occurred in the last years; (ii) ERA5 soil moisture may act as proxy of slope wetness conditions; (iii) ERA5 data could be easily implemented in LEWSs in areas poorly covered by field monitoring networks.

中文翻译：

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探索支持滑坡调查的 ERA5 再分析潜力：坎帕尼亚地区（意大利南部）的一个测试案例

最近，ECMWF 发布了新一代再分析，被称为 ERA5，能够提供过去天气的全面、免费和可操作的图片，利用来自不同来源（卫星、原位、多变量）的历史观测的数据同化对于大气和土壤变量。有关洪水问题的经验表明，ERA5 还可以支持滑坡调查。从这个意义上讲，可能会提出一些问题：(i) ERA5 数据在再现导致滑坡事件的降雨历史方面是否可靠？(ii) ERA5 土壤湿度估计值能否作为前因坡度湿度条件的可靠代表？(iii) ERA5 能否在滑坡预警系统中实施以提高性能？本研究试图通过参考一些历史坎帕尼亚事件（意大利南部）解决这些问题，特别关注 2005 年 3 月 4 日发生在 Nocera Inferiore 的完全调查事件。研究表明：（i）ERA5 降水可以适当地再现实际导致事件发生在过去几年的降雨历史；(ii) ERA5 土壤湿度可以作为斜坡湿度条件的代表；(iii) ERA5 数据可以很容易地在现场监测网络覆盖不足的地区的 LEWS 中实施。