The hourly precipitation intensity and frequency in the Yarlung Zangbo river basin in China during last decade
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ORIGINAL PAPER
The hourly precipitation intensity and frequency in the Yarlung Zangbo river basin in China during last decade Guocan Wu1,2 · Runze Zhao1,2 · Zhanshan Ma3 · Chunming Shi1,2 Received: 7 July 2019 / Accepted: 29 January 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract The analysis of precipitation intensity and frequency should be conducted on data with high temporal resolution, such as hourly precipitation data. This study focuses on the spatial distribution and temporal variation of precipitation intensity and frequency in the Yarlung Zangbo River basin during 2008–2017, based on a merged hourly precipitation dataset with 0.1° of latitude/longitude spatial resolution. The hourly precipitation intensity is represented as the mean accumulated amount in each observation hour and the precipitation frequency is the proportion of precipitation hours in this study. The multi-year mean values and temporal changes of precipitation intensity and frequency are compared at annual time scale, during the warm season (from May to October) and cold season (from November to the next April), as well as among the upper, middle and lower basins. For the whole stream region, the mean hourly precipitation intensity is 0.92 mm/h during the warm season, larger than 0.69 mm/h during the cold season. The mean precipitation frequency is about 7.79% during the warm season, larger than 4.40% during the cold season. For the sub-region, the mean hourly precipitation intensity and frequency are largest for the lower basin during the warm season (1.10 mm/h and 10.62%), whereas largest for the upper basin during the cold season (0.86 mm/h and 4.26%). The hourly precipitation intensity increases during the warm season but decreases during the cold season. The precipitation frequency continuously decreases with larger tendency during the warm season than that during the cold season.
1 Introduction As one of the most important meteorological variables, precipitation has great effects on water resources, industrial/ agricultural production, economic development and ecological balance protection (Allen and Ingram 2002; Donat et al. 2016). It is extremely vulnerable to climate change and its uneven spatial distribution and temporal variations can amplify the differences between dry and wet regions (Allan et al. 2010; Held and Soden 2006). Therefore, precipitation is always one of the central issues in climate change studies Responsible Editor: A.-P. Dimri. * Guocan Wu [email protected] 1
State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
2
Joint Center for Global Change Studies, Beijing, China
3
National Meteorological Center, China Meteorological Administration, Beijing, China
(Portmann et al. 2009; Sun et al. 2018; Trenberth 2011). However, it is particularly challenging to describe due to its fluctuations on nearly all temporal and spatial scales (Chang et al. 2016; Hegerl et al. 201
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