DOI: 10.1002/2015JD024685
论文题名: The resolution dependence of cloud effects and ship-induced aerosol-cloud interactions in marine stratocumulus
作者: Possner A. ; Zubler E. ; Lohmann U. ; Schär C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 9 起始页码: 4810
结束页码: 4829
语种: 英语
英文关键词: aerosol-cloud interactions
; cloud radiative effect
; ship emission impacts
Scopus关键词: aerosol
; boundary layer
; climate modeling
; cloud radiative forcing
; global climate
; homogeneity
; marine environment
; perturbation
; stratocumulus
; vertical mixing
英文摘要: Measures of aerosol-cloud interactions in stratocumulus have been shown to depend on the resolution of the applied data set. In order to contrast resolution with emission dilution effects in models, a regional numerical weather prediction model is used to simulate ship tracks at a range of spatiotemporal resolutions ranging from the global climate modeling scale (Δx = 50 km, Δt = 180 s) to the convection-resolving scale (Δx = 1 km, Δt = 20 s). The background simulations without ship emissions display a high degree of similarity in the planetary boundary layer and cloud properties at all spatiotemporal resolutions. Simulations assessing the impact of emission dilution show an increasing overestimation of the shortwave (SW) cloud radiative effect (CRE) with degenerating emission resolution. Although mean perturbations in the activation-sized aerosol number concentration (Nact) are similar for all dilution experiments, the variability in Nact is increasingly lost with stronger emission dilution. The enhanced Nact homogeneity in turn leads to an overestimated SW CRE. We show that emission dilution alone accounts for 47% of the overestimated SW CRE simulated at low resolutions. The remainder of the differences is attributed to a combination of locally enhanced aerosol concentrations due to weaker vertical mixing simulated at coarse resolutions, in combination with a faster conversion rate of Aitken to accumulation mode particles by redistribution in these regions. © 2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62876
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: Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Possner A.,Zubler E.,Lohmann U.,et al. The resolution dependence of cloud effects and ship-induced aerosol-cloud interactions in marine stratocumulus[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(9)