Variations in the precipitation extremes over the Guangdong-Hong Kong-Macao Greater Bay Area in China

By using the gridded 0.25° × observation dataset of CN05.1 provided by China Meteorological Administration, this study investigates variations in nine extreme precipitation indices over Guangdong-Hong Kong-Macao Greater Bay Area (GBA) from 1961 to 2018. Based on trends and interannual variations, kinds are classified into four categories: category 1 includes very wet days (R95P), extremely (R99P), maximum 1-day amount (RX1day), 5-day (RX5day). Category 2 is number heavy (R10day), (R20day), simple daily intensity index (SDII). Categories 3 4 consecutive (CWDday) dry (CDDday), respectively. For 1, abrupt change point fewer more values occurs 1991 summer. Three points, 1972 2009 1994, occur spring. 2, 1993 1965 2010 1990, Annually seasonally, changes early 2010s for CWDday which clearly increase CDDday decrease. In addition, exhibit points 1966 1983 The these events have significant periodic oscillations 3–5 years, quasi-8 or 8–14 years. During periods 1961–1994, 1995–2009, 2010–2018, annual most seasonal R95P, R99P, R10day, R20day, SDII consistent with those precipitation. latter period increasing compared former stage. RX1day, RX5day, CWDday, their own characteristics.