The Proportional Characteristics of Daytime and Nighttime Precipitation Based on Daily Precipitation in Huai River Basin, China

The daytime and nighttime precipitation proportions of daily total (especially extreme precipitation) are important indicators that help to understand the process formation, which in turn helps evaluate improve models reanalysis data. In this study, we used Huai River Basin (HRB) as a case explore based on 135 meteorological stations during 1961–2018. total, daytime, showed zonal distributions with high low values southern northern parts basin, respectively. was slightly greater than precipitation. With increase intensity, seasonal cycles were more distinct, mainly occurred summer. annual range differences between wet seasons downward trend 1961–2003 followed by an upward 2003–2018. This reversal around 2003 may be related changes convective seasons. decrease light depended contributions events torrential those days accounted for very proportion days, but their amount relatively amount. Annual trend, caused increased Under conditions, large concentrated southeastern HRB, whereas northwestern basin. concurrent increasing trends, especially part precipitation, risk extremes basin (shorter return period means higher risk).