DOI: 10.1002/2014MS000384
Scopus记录号: 2-s2.0-85027952454
论文题名: Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign
作者: Feng Z ; , Hagos S ; , Rowe A ; K ; , Burleyson C ; D ; , Martini M ; N ; , De Szoeke S ; P
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 357
结束页码: 381
语种: 英语
英文关键词: Atmospheric radiation
; Balloons
; Climatology
; Clouds
; Lakes
; Natural convection
; Precipitation (chemical)
; Tropics
; Weather forecasting
; Atmospheric radiation measurements
; Cloud process
; Cold pool
; Convective parameterization
; Madden-Julian oscillation
; Tropical convection
; Tropical Indian ocean
; Weather research and forecasting models
; Precipitation (meteorology)
; climate modeling
; climate prediction
; cold pool
; convective cloud
; flow velocity
; Madden-Julian oscillation
; outflow
; precipitation (climatology)
; simulation
; thermal convection
; thermodynamics
英文摘要: This paper investigates the mechanisms of convective cloud organization by precipitation-driven cold pools over the warm tropical Indian Ocean during the 2011 Atmospheric Radiation Measurement (ARM) Madden-Julian Oscillation (MJO) Investigation Experiment/Dynamics of the MJO (AMIE/DYNAMO) field campaign. A high-resolution regional model simulation is performed using the Weather Research and Forecasting model during the transition from suppressed to active phases of the November 2011 MJO. The simulated cold pool lifetimes, spatial extent, and thermodynamic properties agree well with the radar and ship-borne observations from the field campaign. The thermodynamic and dynamic structures of the outflow boundaries of isolated and intersecting cold pools in the simulation and the associated secondary cloud populations are examined. Intersecting cold pools last more than twice as long, are twice as large, 41% more intense (measured with buoyancy), and 62% deeper than isolated cold pools. Consequently, intersecting cold pools trigger 73% more convection than do isolated ones. This is due to stronger outflows that enhance secondary updraft velocities by up to 45%. However, cold pool-triggered convective clouds grow into deep convection not because of the stronger secondary updrafts at cloud base, but rather due to closer spacing (aggregation) between clouds and larger cloud clusters that form along the cold pool boundaries when they intersect. The close spacing of large clouds moistens the local environment and reduces entrainment drying, increasing the probability that the clouds further develop into deep convection. Implications for the design of future convective parameterization with cold pool-modulated entrainment rates are discussed. Key Points: Intersecting cold pools trigger more clouds than isolated ones Intersecting cold pools produce larger clouds and closer spacing among them Larger clouds and closer spacing promote deeper convection © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76042
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Pacific Northwest National Laboratory, Richland, Washington, United States; Department of Atmospheric Sciences, University of Washington, Seattle, Washington, United States; College of Earth,Ocean, And Atmospheric Sciences, Oregon State University, Corvallis, Oregon, United States
Recommended Citation:
Feng Z,, Hagos S,, Rowe A,et al. Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)