DOI: 10.1016/j.atmosres.2018.08.025
Scopus记录号: 2-s2.0-85054078338
论文题名: Towards an enhanced droplet activation scheme for multi-moment bulk microphysics schemes
作者: Loftus A.M.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 442
结束页码: 449
语种: 英语
英文关键词: Aerosol-cloud interactions
; Cloud microphysics
Scopus关键词: Aerosols
; Chemical activation
; Aerosol concentration
; Aerosol distribution
; Aerosol-cloud interaction
; Cloud microphysics
; Cloud resolving model
; High-order moments
; Microphysical process
; Number concentration
; Drops
英文摘要: Initial droplet spectra produced upon activation impact the ensuing chain of microphysical processes and therefore play a crucial role in cloud evolution. This work re-examines dependencies of newly formed cloud droplet size distribution (CDSD) characteristics on environmental and aerosol properties via parcel model simulations that serve as the basis for a multi-moment bulk microphysics droplet activation scheme suitable for a cloud-resolving model (CRM). It is found that applying a fixed size threshold to define activated droplets versus employing physical considerations can lead to erroneous activation and overly broad CDSDs for high aerosol concentration and weak updraft conditions. Aerosol distributions characterized by larger median sizes and/or increased solubility can result in greater activated droplet numbers, whereas impacts of these parameters on CDSD spectral width depend on both aerosol number concentration and updraft velocity. An expansion of the activation scheme to include CDSD spectral width is proposed to aid efforts to extend high-order moment prediction to cloud droplet categories in CRMs as well as better represent variability in the activation process on the cloud scale. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108729
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Earth System Science Interdisciplinary Center, University Of Maryland, College Park, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Loftus A.M.. Towards an enhanced droplet activation scheme for multi-moment bulk microphysics schemes[J]. Atmospheric Research,2018-01-01,214