DOI: 10.1002/jgrd.50487
论文题名: Assessing the characteristics of extreme precipitation over northeast China using the multifractal detrended fluctuation analysis
作者: Du H. ; Wu Z. ; Zong S. ; Meng X. ; Wang L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6165
结束页码: 6174
语种: 英语
英文关键词: extreme precipitation
; extreme precipitation severity index
; multifractal detrended fluctuation analysis
; threshold
Scopus关键词: Landforms
; Precipitation (meteorology)
; Changbai Mountains
; Extreme precipitation
; Multifractal detrended fluctuation analysis
; Natural ecosystem
; Precipitation time series
; Severity index
; Spatial gradients
; threshold
; Fractals
; atmospheric circulation
; climate conditions
; mountain
; piedmont
; precipitation (climatology)
; spatial analysis
; time series
; wind direction
; Baekdu Mountain
; Changbai Mountains
; China
; Heilongjiang
; Xiao Hinggan Mountains
英文摘要: Extreme climate events have inflicted severe and adverse effects on human life, social economy, and natural ecosystems. In this study, the precipitation time series from a network of 90 weather stations in Northeast China (NEC) and for the period of 1961-2009 are used. An objective method, the multifractal detrended fluctuation analysis method, is applied to determine the thresholds of extreme events. Notable occurrence frequency and strong intensity of extreme precipitation (EP) mainly occur in Liaoning Province and the piedmont regions in Changbai Mountains and Xiao Hinggan Mountains. Generally, EP frequency shows a nonsignificant negative trend, whereas EP intensity has a weak and nonsignificant positive trend for the entire NEC in the period of 1961-2009. To assess EP severity, we propose an EP severity index (EPSI) combining both EP frequency and intensity, rather than separately analyze the EP frequency or intensity. Spatial gradients of EPSI are observed in northeast-southwest and northwest-southeast directions over NEC. The EPSI in northwestern and southeastern NEC are low (0.02-0.3), whereas high EPSI (0.34-0.83) occurs in the southwestern and northeastern portions of the region. Higher EPSI (0.4-0.83) occurs in southern Liaoning Province, which decreases along the southwest-northeast direction. The spatial patterns of EPSI are associated with the circulation over East Asia. Areas that have a short distance from sea and that locate in the windward slope of mountain will probably accompany high EP severity over NEC. Key Points Multifractal detrended fluctuation analysis can actually define EP threshold We propose a new method to analyze the severity for EP events EP severity decrease from Liaoning towards southwest-northeast direction © 2013. American Geophysical Union. All Rights Reserved. 资助项目: 41171038
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63614
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Geographical Science, Northeast Normal University, Renmin St., No. 5268, Changchun 130024, China
Recommended Citation:
Du H.,Wu Z.,Zong S.,et al. Assessing the characteristics of extreme precipitation over northeast China using the multifractal detrended fluctuation analysis[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)