Abstract
The paper explores the impact of El Niño-Southern Oscillation (ENSO) on rainy season precipitation properties over the Yangtze River Basin. The multi-scale moving t-test was used to determine the onset and withdrawal of the rainy season. Results showed the following: (1) Onset and withdrawal of the averaged rainy season over the Yangtze River Basin showed a similar distribution and both progressed northwards and westwards. There is a trend for delayed onset of rainy season precipitation over the Yangtze River Basin. A similar trend in the withdrawal of rainy season precipitation was not found. (2) The decaying Central and Eastern Pacific Warming are indicative of wet signals in the Yangtze River Basin, with precipitation anomalies up to 25% above normal. The decaying Eastern Pacific Cooling and developing Eastern Pacific Warming are indicative of dry signals over the Yangtze River Basin, with 5–20% lower than average precipitation (3) ENSO Modoki in the developing phase is more important than the developing ENSO when it comes to present wetter or drier signals. Conversely, the decaying ENSO shows more prominent wet or dry signals than the decaying ENSO Modoki.
Highlights
El Niño-Southern Oscillation (ENSO) is one of the most significant climate indicators that influence precipitation patterns [1,2,3,4,5,6]
Previous research has focused on seasonal precipitation and precipitation extremes [11,12,13] and the influence of single ENSO mode on precipitation in the Yangtze River Basin (YRB) [10,14] to a great extent
The impact of various ENSO regimes on rainy season precipitation in the YRB, especially comparative analyses of influence of different ENSO
Summary
El Niño-Southern Oscillation (ENSO) is one of the most significant climate indicators that influence precipitation patterns [1,2,3,4,5,6]. ENSO can trigger extreme hydro-climatological events (e.g., floods and droughts) and cause devastating damage to the environment and economy [7]. Destructive Asian summer monsoon flooding occurred in the YRB during two typical El Niño events in 1982/1983 and 1997/1998. The devastating flooding in 2016 was attributed to a variation of Pacific SSTA [3]. Previous research has focused on seasonal precipitation and precipitation extremes [11,12,13] and the influence of single ENSO mode on precipitation in the YRB [10,14] to a great extent. The impact of various ENSO regimes on rainy season precipitation in the YRB, especially comparative analyses of influence of different ENSO regimes in the developing and decaying phases, have not been studied.
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