DOI: 10.1175/JCLI-D-16-0535.1
Scopus记录号: 2-s2.0-85017506861
论文题名: Precipitation associated with convergence lines
作者: Weller E. ; Shelton K. ; Reeder M.J. ; Jakob C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3169
结束页码: 3183
语种: 英语
Scopus关键词: Climatology
; Precipitation (chemical)
; Rain
; Tropics
; Atmospheric circulation
; Convergence/divergence
; Diurnal effects
; Lower troposphere
; Maritime Continent
; Objective methods
; Regional variation
; Temporal and spatial
; Precipitation (meteorology)
英文摘要: Precipitation is often organized along coherent lines of low-level convergence, which at longer time and space scales form well-known convergence zones over the world's oceans. Here, an automated, objective method is used to identify instantaneous low-level convergence lines in reanalysis data and calculate their frequency for the period 1979-2013. Identified convergence lines are combined with precipitation observations to assess the extent to which precipitation around the globe is associated with convergence lines in the lower troposphere. It is shown that a large percentage of precipitation (between 65% and 90%) over the tropical oceans is associated with such convergence lines, with large regional variations of up to 30% throughout the year, especially in the eastern Pacific and Atlantic Oceans. Over land, the annual-mean proportion of precipitation associated with convergence lines ranges between 30% and 60%, and the lowest proportions (less than 15%) associated with convergence lines occur on the eastern flank of the subtropical highs. Overall, much greater precipitation is associated with long coherent lines (greater than 300 km in length) than with shorter fragmented lines (less than 300 km), and the majority of precipitation associated with shorter lines occurs over land. The proportion of precipitation not associated with any convergence line primarily occurs where both precipitation and frequency of convergence lines are low. The high temporal and spatial resolution of the climatology constructed also enables an examination of the diurnal cycle in the relationship between convergence lines and precipitation. Here an example is provided over the tropical Maritime Continent region. © 2017 American Meteorological Society. 资助项目: ARC, Australian Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49687
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth, Atmosphere and Environment, Centre of Excellence for Climate System Science, Monash University, Clayton, VIC, Australia; JBA Consulting, Skipton, United Kingdom
Recommended Citation:
Weller E.,Shelton K.,Reeder M.J.,et al. Precipitation associated with convergence lines[J]. Journal of Climate,2017-01-01,30(9)