DOI: 10.1175/JCLI-D-14-00104.1
Scopus记录号: 2-s2.0-84921664676
论文题名: Sensitivity of tropical cyclones to parameterized convection in the NASA GEOS-5 model
作者: Lim Y.-K. ; Schubert S.D. ; Reale O. ; Lee M.-I. ; Molod A.M. ; Suarez M.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 2 起始页码: 551
结束页码: 573
语种: 英语
Scopus关键词: Air entrainment
; Atmospheric structure
; Heat flux
; Hurricanes
; NASA
; Natural convection
; Storms
; Structure (composition)
; Troposphere
; Wind
; Control configuration
; Goddard earth observing systems
; Horizontal grid spacing
; Hurricane season
; Lower troposphere
; Maximum wind speed
; Moisture flux convergences
; Upper troposphere
; Parameterization
; atmospheric convection
; atmospheric moisture
; computer simulation
; EOS
; hurricane
; latent heat flux
; modeling
; sensitivity analysis
; tropical cyclone
; troposphere
; wind velocity
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The sensitivity of tropical cyclones (TCs) to changes in parameterized convection is investigated to improve the simulation of TCs in the North Atlantic. Specifically, the impact of reducing the influence of the Relaxed Arakawa-Schubert (RAS) scheme-based parameterized convection is explored using the Goddard Earth Observing System version 5 (GEOS-5) model at 0.25° horizontal grid spacing. The years 2005 and 2006, characterized by very active and inactive hurricane seasons, respectively, are selected for simulation. Areduction in parameterized deep convection results in an increase inTCactivity (e.g., TCnumber and longer life cycle) to more realistic levels compared to the baseline control configuration. The vertical and horizontal structure of the strongest simulated hurricane shows the maximum wind speed greater than 60 ms-1 and the minimumsea level pressure reaching ~940 mb, which are never achieved by the control configuration.The radius of themaximumwind of ~50 km, the location of the warmcore exceeding 10°C, and the horizontal compactness of the hurricane center are all quite realistic without any negatively affecting the atmospheric mean state. This study reveals that an increase in the threshold of minimum entrainment suppresses parameterized deep convection by entrainingmore dry air into the typical plume. This leads to cooling and drying at themid to upper troposphere, along with the positive latent heat flux and moistening in the lower troposphere. The resulting increase in conditional instability provides an environment that ismore conducive toTCvortex development and upward moisture flux convergence by dynamically resolved moist convection, thereby increasing TC activity. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50791
Appears in Collections: 气候变化事实与影响
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作者单位: Global Modeling and Assimilation Office, NASA GSFC, Greenbelt, and Goddard Earth Sciences Technology and Research, I. M. Systems Group, Rockville, MD, United States; Global Modeling and Assimilation Office, NASA GSFC, Greenbelt, MD, United States; Global Modeling and Assimilation Office, NASA GSFC, and Goddard Earth Sciences Technology and Research, Universities Space Research Association, Greenbelt, MD, United States; Ulsan Institute of Science and Technology, Ulsan, South Korea; Global Modeling and Assimilation Office, NASA GSFC, Greenbelt, and ESSIC, University of Maryland, College Park, College Park, MD, United States
Recommended Citation:
Lim Y.-K.,Schubert S.D.,Reale O.,et al. Sensitivity of tropical cyclones to parameterized convection in the NASA GEOS-5 model[J]. Journal of Climate,2015-01-01,28(2)