DOI: 10.1002/2017MS001010
Scopus记录号: 2-s2.0-85033232461
论文题名: Vertical Resolution Refinement in an Aqua-Planet and Its Effect on the ITCZ
作者: Retsch M ; H ; , Hohenegger C ; , Stevens B
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 6 起始页码: 2425
结束页码: 2436
语种: 英语
英文关键词: Mixing
; Oceanography
; Solar energy
; ECHAM
; Equatorial positions
; General circulation model
; Intertropical convergence zone
; ITCZ position
; Remaining differences
; Sea surface temperature (SST)
; Vertical resolution
; Surface waters
; cloud cover
; convection
; general circulation model
; intertropical convergence zone
; relative humidity
; sea surface temperature
; simulation
; solar cycle
; troposphere
; vertical profile
英文摘要: The General Circulation Model ECHAM is used to study the effects of three refined vertical resolutions on convection in the tropics and on the structure of the intertropical convergence zone (ITCZ). Additional vertical resolutions have 76, 134, or 192 levels, which is over four times the default resolution of 47 levels. New levels are placed in the troposphere only. The simulations are conducted on an aqua-planet with equator symmetrical, time and zonal independent sea surface temperature, and without a yearly solar cycle. Whereas the default vertical resolution shows a double ITCZ, refining the vertical resolution yields an equatorward shift of the ITCZ. The ITCZ converges to its equatorial position with 134 levels. The sensitivity of the ITCZ to the vertical resolution is traced back first and foremost to the mixing formulation in the convection scheme. Here a higher number of vertical levels leads to a stronger mixing between the updraft and its environment by design, which favors an equatorward position of the ITCZ. Differences in the relative humidity profiles explain the remaining differences in the ITCZ location. These differences can mostly be eliminated by making clouds transparent. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75717
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: Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
Retsch M,H,, Hohenegger C,et al. Vertical Resolution Refinement in an Aqua-Planet and Its Effect on the ITCZ[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(6)