基于格点数据的1961-2012年祁连山面雨量特征分析

doi:10.11821/dlxb201507009

Abstract

Abstract:

Based on the 0.5°×0.5° daily gridded precipitation dataset and observations at meteorological stations released by the National Meteorological Information Center, the interannual variation of areal precipitation in the Qilian Mountains during 1961-2012 is investigated using principal component analysis (PCA) and regression analysis, and the relationship between areal precipitation anomaly and drought accumulation intensity is analyzed. The results indicate that the spatial distribution of precipitation in the Qilian Mountains can be well reflected by the gridded dataset. The gridded data-based precipitation in mountainous regions is generally larger than that in plain regions. Generally, there is more precipitation in the eastern section of the mountain range than in the western section. The annual mean areal precipitation in the Qilian Mountains is 724.9×10⁸m³, and the seasonal means in spring, summer, autumn and winter are 118.9×10⁸m³, 469.4×10⁸m³, 122.5×10⁸m³ and 14.1×10⁸m³, respectively. Summer is a season with most areal precipitation, being approximately 64.76%. The areal precipitation in summer, autumn and winter shows an increasing trend, while spring presents a decreasing trend. Among the four seasons, summer has the largest trend magnitude of 1.7×10⁸ m³ per year.

Key words: gridded dataset, areal precipitation, Qilian Mountains, principal component analysis, drought accumulation intensity

Fang QIANG, Mingjun ZHANG, Shengjie WANG, Yangmin LIU, Zhengguo REN, Xiaofan ZHU. Changes of areal precipitation based on gridded dataset in Qilian Mountains during 1961-2012[J].Acta Geographica Sinica, 2015, 70(7): 1125-1136.

Figures/Tables 13

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成分	初始特征值
	合计		方差贡献(%)	累积(%)
第1主成分	279.99	68.96	68.96
第2主成分	27.42	6.75	75.72
第3主成分	25.54	6.29	82.01

	春	夏	秋	冬	总和
面雨量(10⁸ m³)	118.9	469.4	122.5	14.1	724.9
所占比例	16.40%	64.76%	16.90%	1.94%

时段	春	夏	秋	冬	年
1961-1970	138.4	422.2	117.3	10.0	687.9
1971-1980	86.4	470.4	123.5	14.1	694.4
1981-1990	134.4	476.6	126.5	15.4	752.9
1991-2000	110.7	462.3	98.9	15.2	687.0
2001-2010	124.6	494.0	147.8	16.1	782.5
1961-1986	117.3	455.8	121.1	12.5	706.7
1987-2012	120.5	483.0	124.0	15.6	743.1
1961-2012	118.9	469.4	122.5	14.1	724.9

评价结果	年面雨量距平百分比(%)	评价结果	各月面雨量距平百分比(%)
较多	8≤∆R≤25	异常偏多	∆R≥80
正常	-8≤∆R≤8	显著偏多	50≤∆R≤80
较少	-25≤∆R≤-8	偏多	25≤∆R≤50
		正常	-25≤∆R≤25
		偏少	-50≤∆R≤-25
		显著偏少	-80≤∆R≤-50
		异常偏少	∆R≤-80

Changes of areal precipitation based on gridded dataset in Qilian Mountains during 1961-2012

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