DOI: 10.1002/2015MS000434
Scopus记录号: 2-s2.0-85027942209
论文题名: The effect of atmospheric radiative heating by clouds on the Madden-Julian Oscillation
作者: Crueger T ; , Stevens B
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 854
结束页码: 864
语种: 英语
英文关键词: Climatology
; Electromagnetic waves
; Gravity waves
; Heat convection
; Heat radiation
; Heating
; Radiant heating
; Radiation effects
; Atmosphere general circulation models
; Cloud microphysical process
; Cloud radiative effects
; Equatorial waves
; Intertropical convergence zone
; Intraseasonal variability
; Madden-Julian oscillation
; Tropical precipitation
; Precipitation (meteorology)
; atmospheric convection
; electromagnetic method
; general circulation model
; heating
; intertropical convergence zone
; Kelvin wave
; Madden-Julian oscillation
; precipitation (climatology)
; radiative forcing
; seasonal variation
; simulation
; Indian Ocean
; Indian Ocean (Equatorial)
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: This article explores how atmospheric radiative heating, due to the presence of clouds, influences the Madden-Julian Oscillation (MJO) as simulated by four comprehensive atmosphere general circulation models. Simulations in which clouds are transparent to electromagnetic radiation ("clouds-off") are compared with control simulations in which clouds are allowed to interact with radiation ("clouds-on"). Making clouds transparent to radiation leads to robust changes of the mean state: the westerly winds in the equatorial Indo-Pacific area weaken and the precipitation reveals a shift from single to double Intertropical Convergence Zones. These changes are accompanied by weaker MJOs. Also, the moisture sensitivity of precipitation changes, however not consistently within our group of models. Further analyses show that within the active phase of intraseasonal variability, cloud-radiative effects amplify the heating profiles compared to clouds-off. Heating from nonradiative processes is dominated by the parameterized convection, but large-scale heating associated with cloud microphysical processes acting on the grid-scale modifies the shape of the heating profile, leading to a top-heaviness when cloud-radiative effects are accounted for. The radiative heating due to clouds slows down the phase speed of the MJO. Averaged over the entire MJO life cycle, the column-integrated radiative heating due to clouds lags the vertically integrated moist static energy by 40°-60°of longitude (equivalently 7-10 days assuming a period of 60 days). All four models studied reveal more pronounced Kelvin waves when clouds are transparent to radiation, suggesting that cloud-radiative effects on large-scale heating profiles damp smaller scale, or faster, Kelvin waves and amplify MJO-like disturbances. Key Points: Cloud-radiative effects lead to a more realistic mean state and a better MJO In the convective MJO phase, the heating profile is more top-heavy Stronger Kelvin waves are connected with weaker MJOs © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76039
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: Atmosphere in the Earth System, Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
Crueger T,, Stevens B. The effect of atmospheric radiative heating by clouds on the Madden-Julian Oscillation[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)