Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-1475-2018 |
Relating large-scale subsidence to convection development in Arctic mixed-phase marine stratocumulus | |
Young, Gillian1,2; Connolly, Paul J.1; Dearden, Christopher1,3; Choularton, Thomas W.1 | |
2018-02-02 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:3页码:1475-1494 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Large-scale subsidence, associated with high-pressure systems, is often imposed in large-eddy simulation (LES) models to maintain the height of boundary layer (BL) clouds. Previous studies have considered the influence of subsidence on warm liquid clouds in subtropical regions; however, the relationship between subsidence and mixedphase cloud microphysics has not specifically been studied. For the first time, we investigate how widespread subsidence associated with synoptic-scale meteorological features can affect the microphysics of Arctic mixed-phase marine stratocumulus (Sc) clouds. Modelled with LES, four idealised scenarios - a stable Sc, varied droplet (N-drop) or ice (N-ice) number concentrations, and a warming surface (representing motion southwards) - were subjected to different levels of subsidence to investigate the cloud microphysical response. We find strong sensitivities to large-scale subsidence, indicating that high-pressure systems in the ocean-exposed Arctic regions have the potential to generate turbulence and changes in cloud microphysics in any resident BL mixed-phase clouds. Increased cloud convection is modelled with increased subsidence, driven by longwave radiative cooling at cloud top and rain evaporative cooling and latent heating from snow growth below cloud. Subsidence strengthens the BL temperature inversion, thus reducing entrainment and allowing the liquid-and ice-water paths (LWPs, IWPs) to increase. Through increased cloud-top radiative cooling and subsequent convective overturning, precipitation production is enhanced: rain particle number concentrations (N-rain), incloud rain mass production rates, and below-cloud evaporation rates increase with increased subsidence. Ice number concentrations (N-ice) play an important role, as greater concentrations suppress the liquid phase; therefore, N-ice acts to mediate the strength of turbulent overturning promoted by increased subsidence. With a warming surface, a lack of - or low - subsidence allows for rapid BL turbulent kinetic energy (TKE) coupling, leading to a heterogeneous cloud layer, cloud-top ascent, and cumuli formation below the Sc cloud. In these scenarios, higher levels of subsidence act to stabilise the Sc layer, where the combination of these two forcings counteract one another to produce a stable, yet dynamic, cloud layer. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000424049100002 |
WOS关键词 | COLD-AIR OUTBREAKS ; MESOSCALE CELLULAR STRUCTURES ; WATER POTENTIAL TEMPERATURE ; ICE NUCLEI ; SOUTHEAST PACIFIC ; BOUNDARY-LAYER ; CLIMATE MODELS ; PART II ; CLOUD ; PRECIPITATION |
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/29473 |
专题 | 地球科学 |
作者单位 | 1.Univ Manchester, Sch Earth & Environm Sci, Ctr Atmospher Sci, Manchester, Lancs, England; 2.British Antarctic Survey, Madingley Rd, Cambridge, England; 3.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England |
推荐引用方式 GB/T 7714 | Young, Gillian,Connolly, Paul J.,Dearden, Christopher,et al. Relating large-scale subsidence to convection development in Arctic mixed-phase marine stratocumulus[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(3):1475-1494. |
APA | Young, Gillian,Connolly, Paul J.,Dearden, Christopher,&Choularton, Thomas W..(2018).Relating large-scale subsidence to convection development in Arctic mixed-phase marine stratocumulus.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(3),1475-1494. |
MLA | Young, Gillian,et al."Relating large-scale subsidence to convection development in Arctic mixed-phase marine stratocumulus".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.3(2018):1475-1494. |
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