1960-2013年秦岭—淮河南北极端降水时空变化特征及其影响因素

doi:10.11820/dlkxjz.2015.03.010

Abstract

Abstract:

Based on the monthly precipitation of a 0.5°×0.5° grid dataset and the daily precipitation observations of 135 meteorological stations released by the National Meteorological Information Center of China, this study analyzed the spatiotemporal variation of extreme precipitation in north and south of the Qinling-Huaihe region during 1960-2013, using the methods of trend analysis, Sen+Mann-Kendall model, and correlation analysis. More specifically, we analyzed the relationship between ENSO and the observed extreme precipitation. The results are as follows: (1) the precipitation showed an increasing trend in the lower reach of the Yangtze River and a decreasing tendency in the other regions; (2) extreme precipitation analysis indicates a declining trend in rainy days and an increasing trend in precipitation intensity. The number of continuous drought events increased. Spatially, the regions with increasing intensity of extreme precipitation were mainly distributed in the Qinling-Bashan Mountains and the lower reaches of the Yangtze River and Yellow River, whereas there were more drought events in the Guanzhong Plain, Wushan Mountains, and Sichuan Basin; (3) Extreme precipitation had a close relationship with ENSO in the study region. In El Niño years, more precipitation was found in the spring but there was less precipitation in the summer and the whole year. In La Niña years, there was less precipitation in the spring and more precipitation in the autumn and the whole year. The responses of extreme precipitation events to El Niño exhibited spatial differences. Most of the regions with decreasing extreme precipitation in El Niño years were distributed in the lower reach of the Yellow River, the Guanzhong Plain and Qinling-Bashan Mountains, as well as the Sichuan Basin, while the region with increasing extreme precipitation was the Huaihe Plain. The lower reach of the Yangtze River and the Wushan Mountains showed no clear response to ENSO.

Key words: climate change, extreme precipitation, spatiotemporal change, north and south of the Qinling -Huaihe region

Shuangshuang LI, Saini YANG, Xianfeng LIU. Spatiotemporal variability of extreme precipitation in north and south of the Qinling-Huaihe region and influencing factors during 1960-2013[J].PROGRESS IN GEOGRAPHY, 2015, 34(3): 354-363.

Figures/Tables 2

References 31

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指标类型	极端降水指数	英文缩写	定义
绝对指标	雨日日数	RD	年内日降水日数/d
	痕雨日数	Rr1	年内日降水量≥1 mm日数/d
	小雨日数	Rr5	年内日降水量≥5 mm日数/d
	中雨日数	Rr10	年内日降水量≥10 mm日数/d
	大雨日数	Rr25	年内日降水量≥25 mm日数/d
强度指标	1日最大降水量	Rx1day	月内1日降水量最大值/mm
	5日最大降水量	Rx5day	月内连续5日降水量最大值/mm
	年降水强度	SDII	年内降水量与日降水量≥1 mm 日数之比/(mm/d)
相对指标	异常降水日数	R95	年内日降水量高于95%阈值日数之和/d
	极端降水日数	R99	年内日降水量高于99%阈值日数之和/d
	异常降水总量	R95P	年内日降水量高于95%阈值降水量之和/mm
	极端降水总量	R99P	年内日降水量高于99%阈值降水量之和/mm
持续性指标	连续无雨日数	CDD	年内日降水量连续<1 mm日数最大值/d
	连续降水日数	CWD	年内日降水量连续≥1 mm日数最大值/d
	年降水量	PRCPTOT	年内日降水量≥1 mm降水量之和/mm
	生长季降水量	GPRCP	年内4-9月(生长季)降水量之和/mm

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Spatiotemporal variability of extreme precipitation in north and south of the Qinling-Huaihe region and influencing factors during 1960-2013

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