DOI: 10.1175/JCLI-D-16-0346.1
Scopus记录号: 2-s2.0-85008226088
论文题名: An improved convective ice parameterization for the NASA GISS global climate model and impacts on cloud ice simulation
作者: Elsaesser G.S. ; Del Genio A.D. ; Jiang J.H. ; Lier-Walqui M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 1 起始页码: 317
结束页码: 336
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Clouds
; NASA
; Oceanography
; Parameterization
; Particle size
; Particle size analysis
; Scales (weighing instruments)
; Surface waters
; Troposphere
; Aircraft observations
; Cloud microphysics
; Cloud parameterizations
; Convective parameterization
; Model evaluation/performance
; Ice
英文摘要: Partitioning of convective ice into precipitating and detrained condensate presents a challenge for GCMs since partitioning depends on the strength and microphysics of the convective updraft. It is an important issue because detrainment of ice from updrafts influences the development of stratiform anvils, impacts radiation, and can affect GCM climate sensitivity. Recent studies have shown that the CMIP5 configurations of the Goddard Institute for Space Studies (GISS) GCM simulated upper-tropospheric ice water content (IWC) that exceeded an estimated upper bound by a factor of 2. Partly in response to this bias, a new GCM parameterization of convective cloud ice has been developed that incorporates new ice particle fall speeds and convective outflow particle size distributions (PSDs) from the NASA African Monsoon Multidisciplinary Analyses (NAMMA), NASA Tropical Composition, Cloud and Climate Coupling (TC4), DOE ARM-NASA Midlatitude Continental Convective Clouds Experiment (MC3E), and DOE ARM Small Particles in Cirrus (SPARTICUS) field campaigns. The new parameterization assumes a normalized gamma PSD with two novel developments: no explicit assumption for particle habit in the calculation of mass distributions, and a formulation for translating ice particle fall speeds as a function of maximum diameter into fall speeds as a function of melted-equivalent diameter. Two parameters (particle volume- and projected area-weighted equivalent diameter) are diagnosed as a function of temperature and IWC in the convective plume, and these parameters constrain the shape and scale of the normalized gamma PSD. The diagnosed fall speeds and PSDs are combined with the GCM's parameterized convective updraft vertical velocity to partition convective updraft condensate into precipitating and detrained components. A 5-yr prescribed sea surface temperature GCM simulation shows a 30%-50% decrease in upper-tropospheric deep convective IWC, bringing the tropical and global mean ice water path into closer agreement with CloudSat best estimates. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49827
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Applied Physics and Mathematics, Columbia University, NASA Goddard Institute for Space Studies, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; NASA Goddard Institute for Space Studies, Center for Climate Systems Research, Columbia University, New York, NY, United States
Recommended Citation:
Elsaesser G.S.,Del Genio A.D.,Jiang J.H.,et al. An improved convective ice parameterization for the NASA GISS global climate model and impacts on cloud ice simulation[J]. Journal of Climate,2017-01-01,30(1)