DOI: 10.1175/JCLI-D-16-0019.1
Scopus记录号: 2-s2.0-85008192293
论文题名: Seasonal variability in precipitation in central and southern Chile: Modulation by the South Pacific high
作者: Barrett B.S. ; Hameed S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 1 起始页码: 55
结束页码: 69
语种: 英语
Scopus关键词: Atmospheric pressure
; Autumn precipitation
; Correlation patterns
; Large scale motion
; Multiple linear regressions
; Positive correlations
; Seasonal variability
; Spring precipitation
; Tropospheric circulation
; Linear regression
英文摘要: Monthly precipitation in Chile (30°-55°S) was found to vary by intensity, latitude, and longitude of the South Pacific high (SPH). In austral winter, precipitation was higher when the SPH was weaker and when it was centered farther west. In austral spring, precipitation was higher when the SPH was weaker, similar to winter. However, spring precipitation was not found to be related to SPH longitude, and higher precipitation was found when the SPH was centered farther north. In austral summer, no relationship was found between precipitation and either SPH intensity or longitude, but positive correlations were found between precipitation and latitude of the SPH. In austral autumn, correlation patterns between precipitation and all three SPH metrics more closely resembled those seen in winter. The results of a multiple linear regression confirmed the importance of two SPH metrics (intensity and longitude) and the unimportance of a third SPH metric (latitude) in understanding variability in winter, summer, and autumn precipitation in central and southern Chile. In spring, regression results confirmed a relationship between precipitation and SPH intensity and latitude. Furthermore, the SPH intensity and longitude in winter combined to hindcast monthly precipitation with a better goodness of fit than five El Niño-Southern Oscillation metrics traditionally related to Chilean precipitation. Anomalies of lower-tropospheric circulation and vertical velocities were found to support the observed relationships between SPH and precipitation. Based on these results, a physical mechanism is proposed that employs the SPH as a metric to aid in understanding variability in precipitation in central and south-central Chile in all seasons. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49838
Appears in Collections: 气候变化事实与影响
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作者单位: Oceanography Department, U.S. Naval Academy, Annapolis, MD, United States; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States
Recommended Citation:
Barrett B.S.,Hameed S.. Seasonal variability in precipitation in central and southern Chile: Modulation by the South Pacific high[J]. Journal of Climate,2017-01-01,30(1)