Response of Extreme Precipitation to Solar Activity and El Nino Events in Typical Regions of the Loess Plateau

Table 2

El Nino events from 1951 to 2015.

El Nino events	Starting and ending time	Strength grade	Time span	Occurrence time
1952	Aug. 1951–Apr. 1952	Weak	2	Summer
1957	Apr. 1957–Feb. 1958	Strong	2	Spring
1958	Mar. 1958–Aug. 1958	Strong	1	Spring
1963	Jul. 1963–Jan. 1964	Weakest	2	Summer
1965	May 1965–Mar. 1966	Moderate	2	Spring
1968	Oct. 1968–Mar. 1969	Moderate	1	Autumn
1969	Apr. 1969–Jan. 1970	Moderate	3	Summer
1972	Jun. 1972–Mar. 1973	Strong	2	Summer
1976	Jun. 1976–Nov. 1976	Weak	1	Summer
1977	Dec. 1976–Mar. 1977	Weak	1	Spring
1982	Sep. 1982–Nov. 1982	Strong	1	Autumn
1983	Dec. 1983–Mar. 1983	Strong	1	Autumn
1986	Oct. 1986–Nov. 1986	Strong	1	Autumn
1987	Dec. 1987–Mar. 1988	Strong	3	Autumn
1991	May 1991–Mar. 1992	Strong	2	Spring
1992	Apr. 1992–Jun. 1992	Strong	1	Spring
1993	Apr. 1993–Nov. 1993	Weak	1	Spring
1994	May 1994–Feb. 1995	Moderate	2	Spring
1997	May 1997–Jul. 1998	Strongest	2	Spring
2002	May 2002–Mar. 2003	Moderate	2	Spring
2004	Jul. 2004–Feb. 2005	Weak	2	Summer
2006	Sep. 2006–Jan. 2007	Weak	2	Autumn
2009	Jun. 2009–May 2010	Moderate	2	Summer
2012	Jul. 2012–Nov. 2012	Weak	1	Summer
2015	May 2015–Dec. 2015	Strong	1	Spring