Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-12725-2017 |
Impacts of solar-absorbing aerosol layers on the transition of stratocumulus to trade cumulus clouds | |
Zhou, Xiaoli1; Ackerman, Andrew S.2; Fridlind, Ann M.2; Wood, Robert3; Kollias, Pavlos4,5 | |
2017-10-26 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:20 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | The effects of an initially overlying layer of solar-absorbing aerosol on the transition of stratocumulus to trade cumulus clouds are examined using large-eddy simulations. For lightly drizzling cloud the transition is generally hastened, resulting mainly from increased cloud droplet number concentration (N-c) induced by entrained aerosol. The increased N-c slows sedimentation of cloud droplets and shortens their relaxation time for diffusional growth, both of which accelerate entrainment of overlying air and thereby stratocumulus breakup. However, the decrease in albedo from cloud breakup is more than offset by redistributing cloud water over a greater number of droplets, such that the diurnal-average shortwave forcing at the top of the atmosphere is negative. The negative radiative forcing is enhanced by sizable longwave contributions, which result from the greater cloud breakup and a reduced boundary layer height associated with aerosol heating. A perturbation of moisture instead of aerosol aloft leads to a greater liquid water path and a more gradual transition. Adding absorbing aerosol to that atmosphere results in substantial reductions in liquid water path (LWP) and cloud cover that lead to positive shortwave and negative longwave forcings on average canceling each other. Only for heavily drizzling clouds is the breakup delayed, as inhibition of precipitation overcomes cloud water loss from enhanced entrainment. Considering these simulations as an imperfect proxy for biomass burning plumes influencing Namibian stratocumulus, we expect regional indirect plus semi-direct forcings to be substantially negative to negligible at the top of the atmosphere, with its magnitude sensitive to background and perturbation properties. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413757200003 |
WOS关键词 | MARINE BOUNDARY-LAYER ; LARGE-EDDY SIMULATIONS ; BIOMASS BURNING AEROSOL ; STRATIFORM CLOUDS ; CONDENSATION NUCLEI ; CLIMATE RESPONSE ; SMOKE AEROSOL ; SAFARI 2000 ; MICROPHYSICS ; MODEL |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17277 |
专题 | 地球科学 |
作者单位 | 1.McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada; 2.NASA, Goddard Inst Space Studies, New York, NY 10025 USA; 3.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA; 4.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY 11794 USA; 5.Brookhaven Natl Lab, Dept Environm & Climate Sci, Upton, NY 11973 USA |
推荐引用方式 GB/T 7714 | Zhou, Xiaoli,Ackerman, Andrew S.,Fridlind, Ann M.,et al. Impacts of solar-absorbing aerosol layers on the transition of stratocumulus to trade cumulus clouds[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(20). |
APA | Zhou, Xiaoli,Ackerman, Andrew S.,Fridlind, Ann M.,Wood, Robert,&Kollias, Pavlos.(2017).Impacts of solar-absorbing aerosol layers on the transition of stratocumulus to trade cumulus clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(20). |
MLA | Zhou, Xiaoli,et al."Impacts of solar-absorbing aerosol layers on the transition of stratocumulus to trade cumulus clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.20(2017). |
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