Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0723.1 |
The Role of the Water Vapor Feedback in the ITCZ Response to Hemispherically Asymmetric Forcings | |
Clark, Spencer K.1; Ming, Yi2; Held, Isaac M.2; Phillipps, Peter J.2 | |
2018-05-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:9页码:3659-3678 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | In comprehensive and idealized general circulation models, hemispherically asymmetric forcings lead to shifts in the latitude of the intertropical convergence zone (ITCZ). Prior studies using comprehensive GCMs (with complicated parameterizations of radiation, clouds, and convection) suggest that the water vapor feedback tends to amplify the movement of the ITCZ in response to a given hemispherically asymmetric forcing, but this effect has yet to be elucidated in isolation. This study uses an idealized moist model, coupled to a full radiative transfer code, but without clouds, to examine the role of the water vapor feedback in a targeted manner. In experiments with interactive water vapor and radiation, the ITCZ latitude shifts roughly twice as much off the equator as in cases with the water vapor field seen by the radiation code prescribed to a static hemi-sperically symmetric control distribution. Using energy flux equator theory for the latitude of the ITCZ, the amplification of the ITCZ shift is attributed primarily to the longwave water vapor absorption associated with the movement of the ITCZ into the warmer hemisphere, further increasing the net column heating asymmetry. Local amplification of the imposed forcing by the shortwave water vapor feedback plays a secondary role. Experiments varying the convective relaxation time, an important parameter in the convection scheme used in the idealized moist model, yield qualitatively similar results, suggesting some degree of robustness to the model physics; however, the sensitivity experiments do not preclude that more extreme modifications to the convection scheme could lead to qualitatively different behavior. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429529900018 |
WOS关键词 | INTERTROPICAL CONVERGENCE ZONE ; AQUAPLANET MOIST GCM ; PART I ; TROPICAL CIRCULATION ; RADIATIVE FEEDBACKS ; HYDROLOGICAL CYCLE ; ENERGY BUDGET ; IDEALIZED GCM ; GREENHOUSE ; DYNAMICS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19778 |
专题 | 气候变化 |
作者单位 | 1.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08544 USA; 2.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA |
推荐引用方式 GB/T 7714 | Clark, Spencer K.,Ming, Yi,Held, Isaac M.,et al. The Role of the Water Vapor Feedback in the ITCZ Response to Hemispherically Asymmetric Forcings[J]. JOURNAL OF CLIMATE,2018,31(9):3659-3678. |
APA | Clark, Spencer K.,Ming, Yi,Held, Isaac M.,&Phillipps, Peter J..(2018).The Role of the Water Vapor Feedback in the ITCZ Response to Hemispherically Asymmetric Forcings.JOURNAL OF CLIMATE,31(9),3659-3678. |
MLA | Clark, Spencer K.,et al."The Role of the Water Vapor Feedback in the ITCZ Response to Hemispherically Asymmetric Forcings".JOURNAL OF CLIMATE 31.9(2018):3659-3678. |
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