DOI: 10.1175/JCLI-D-14-00837.1
Scopus记录号: 2-s2.0-84949979685
论文题名: Contrasting influences of recent aerosol changes on clouds and precipitation in Europe and East Asia
作者: Stjern C.W. ; Kristjánsson J.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 22 起始页码: 8770
结束页码: 8790
语种: 英语
Scopus关键词: Aerosols
; Drops
; Precipitation (chemical)
; Aerosol-cloud interaction
; Anthropogenic effects
; Background concentration
; Cloud droplet number concentrations
; Cloud microphysics
; Convective precipitation
; Precipitation patterns
; Stratiform precipitation
; Precipitation (meteorology)
英文摘要: Over the last few decades, aerosol loadings have increased greatly over Southeast Asia, while Europe and North America have experienced huge reductions. Previous studies have suggested that these changes may have influenced the temperature trends as well as precipitation patterns due to the direct and semidirect aerosol effects. Here, an Earth system model with parameterized aerosol-radiation and aerosol-cloud interactions is used to investigate changes in cloud properties and precipitation between 1975 and 2005. This is done globally as well as for the two focus areas Europe and East Asia. Despite systematic changes in cloud droplet number concentration and cloud droplet size, changes in stratiform precipitation are less clear. In both regions there is a dominance of autoconversion over liquid water accretion as the primary precipitation release mechanism, which alone should imply a strong sensitivity to changes in cloud droplet size. However, in these areas liquid water paths are relatively low and background concentrations are high, which produce low simulated precipitation susceptibilities. High susceptibilities are instead found over remote ocean regions, in agreement with expectations. For convective precipitation, both regions show statistically significant changes that are consistent with oppositely signed changes in direct aerosol forcing over Europe and East Asia, respectively. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50634
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences, University of Oslo, Oslo, Norway
Recommended Citation:
Stjern C.W.,Kristjánsson J.E.. Contrasting influences of recent aerosol changes on clouds and precipitation in Europe and East Asia[J]. Journal of Climate,2015-01-01,28(22)