DOI: 10.1175/JCLI-D-17-0794.1
Scopus记录号: 2-s2.0-85052638503
论文题名: The role of the cloud radiative effect in the sensitivity of the intertropical convergence zone to convective mixing
作者: Talib J. ; Woolnough S.J. ; Klingaman N.P. ; Holloway C.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 17 起始页码: 6821
结束页码: 6838
语种: 英语
英文关键词: Cloud radiative effects
; Energy transport
; Entrainment
; Hadley circulation
; Intertropical convergence zone
; Meridional overturning circulation
Scopus关键词: Air entrainment
; Heat flux
; Heat radiation
; Radiation effects
; Cloud radiative effects
; Energy transport
; Hadley circulation
; Intertropical convergence zone
; Meridional overturning circulations
; Mixing
英文摘要: Studies have shown that the location and structure of the simulated intertropical convergence zone (ITCZ) is sensitive to the treatment of sub-gridscale convection and cloud-radiation interactions. This sensitivity remains in idealized aquaplanet experiments with fixed surface temperatures. However, studies have not considered the role of cloud-radiative effects (CRE; atmospheric heating due to cloud-radiation interactions) in the sensitivity of the ITCZ to the treatment of convection. We use an atmospheric energy input (AEI) framework to explore how the CRE modulates the sensitivity of the ITCZ to convective mixing in aquaplanet simulations. Simulations show a sensitivity of the ITCZ to convective mixing, with stronger convective mixing favoring a single ITCZ. For simulations with a single ITCZ, the CRE maintains the positive equatorial AEI. To explore the role of the CRE further, we prescribe the CRE as either zero or a meridionally and diurnally varying climatology. Removing the CRE is associated with a reduced equatorial AEI and an increase in the range of convective mixing rates that produce a double ITCZ. Prescribing the CRE reduces the sensitivity of the ITCZ to convective mixing by 50%. In prescribed-CRE simulations, other AEI components, in particular the surface latent heat flux, modulate the sensitivity of the AEI to convective mixing. Analysis of the meridional moist static energy transport shows that a shallower Hadley circulation can produce an equatorward energy transport at low latitudes even with equatorial ascent. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110694
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, Climate and Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Talib J.,Woolnough S.J.,Klingaman N.P.,et al. The role of the cloud radiative effect in the sensitivity of the intertropical convergence zone to convective mixing[J]. Journal of Climate,2018-01-01,31(17)