globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000560
Scopus记录号: 2-s2.0-84978015064
论文题名:
ITCZ structure as determined by parameterized versus explicit convection in aquachannel and aquapatch simulations
作者: Nolan D; S; , Tulich S; N; , Blanco J; E
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期:1
起始页码: 425
结束页码: 452
语种: 英语
英文关键词: Atmospheric humidity ; Heat convection ; Potential energy ; Rain ; Storms ; Tropics ; Weather forecasting ; Atmospheric parameters ; Cloud-resolving ; Convective available potential energies ; Convective parameterization ; Cumulus parameterization ; High resolution simulations ; Intertropical convergence zone ; Weather research and forecasting models ; Parameterization ; beta-plane ; convection ; eddy ; general circulation model ; intertropical convergence zone ; parameterization ; potential energy ; precipitation assessment ; relative humidity ; weather forecasting
英文摘要: Numerous studies using both global and regional models of the atmosphere have found daunting sensitivities of the structure and dynamics of the intertropical convergence zone (ITCZ) to the representations of unresolved processes, particularly the convective parameterization (CP). Evaluations of these results by comparison to high-resolution simulations with explicit convection have been rather limited, due to the large computational burden of using grid spacings less than 10 km over large domains representative of the Earth's tropics. This study introduces a framework that allows the use of cloud-resolving grid spacings over the tropics and larger spacings over remainder of the domain. The Weather Research and Forecasting (WRF) model is used in an "aquachannel" beta-plane configuration, zonally periodic with length equal to that of the real equator. This model reproduces the general circulation and eddy statistics of similarly configured aquaplanet models. A channel shortened to one third the length of the equator (the "aquapatch") also reproduces the zonal-mean circulations and eddies. Finally, nested grids embedded in the aquapatch are used to simulate tropical convection with 5.15 km resolution. The nested 5.15 km simulations produce broader and lighter rainfall distributions, making single ITCZs wider and smoothing out double ITCZ structures. They also show quite different rainfall production rates for atmospheric parameters such as convective available potential energy (CAPE) and column relative humidity (CRH). The apparent reason for these differences is that the higher resolution allows for the representation of squall lines and associated cold pools that propagate meridionally, redistributing rainfall away from the ITCZ. © 2016. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75919
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, United States

Recommended Citation:
Nolan D,S,, Tulich S,et al. ITCZ structure as determined by parameterized versus explicit convection in aquachannel and aquapatch simulations[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(1)
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