DOI: 10.1175/JCLI-D-14-00377.1
Scopus记录号: 2-s2.0-84944111704
论文题名: Impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting
作者: L'Hévéder B. ; Codron F. ; Ghil M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 7 起始页码: 2650
结束页码: 2664
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Feedback
; Fighter aircraft
; Heat transfer
; Heating
; Ocean currents
; Oceanography
; Storms
; Atmosphere-ocean interactions
; Atmospheric circulation
; Climate sensitivity
; Cloud radiative effects
; Intertropical convergence zone
; Meridional overturning circulations
; Tropics
; air-sea interaction
; atmospheric circulation
; cloud radiative forcing
; general circulation model
; global climate
; heat transfer
; heating
; intertropical convergence zone
; meridional circulation
; Atlantic Ocean
; Atlantic Ocean (North)
; Gulf Stream
; Southern Ocean
英文摘要: This paper explores the impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting. To that end, the GCM LMDZ5A of the Laboratoire de Météorologie Dynamique is coupled to a slab ocean, with realistic zonal asymmetries and seasonal cycle. Two simulations with different anomalous surface heating are imposed: 1) uniform heating over the North Atlantic basin and 2) concentrated heating in the Gulf Stream region, with a compensating uniform cooling in the Southern Ocean in both cases. The magnitudes of the heating and of the implied northward interhemispheric heat transport are within the range of current natural variability. Both simulations show global effects that are particularly strong in the tropics, with a northward shift of the intertropical convergence zone (ITCZ) toward the heating anomalies. This shift is accompanied by a northward shift of the storm tracks in both hemispheres. From the comparison between the two simulations with different anomalous surface heating in the North Atlantic, it emerges that the global climate response is nearly insensitive to the spatial distribution of the heating. The cloud response acts as a large positive feedback on the oceanic forcing, mainly because of the low-cloud-induced shortwave anomalies in the extratropics. While previous literature has speculated that the extratropical Q flux may impact the tropics by the way of the transient eddy fluxes, it is explicitly demonstrated here. In the midlatitudes, the authors find a systematic northward shift of the jets, as well as of the associated Ferrel cells, storm tracks, and precipitation bands. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50739
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratoire de Météorologie Dynamique, L'Institut Pierre-Simon Laplace, Centre National de la Recherche Scientifiques, Ecole Normale Supérieure, Paris, France; Université Pierre et Marie Curie, Paris, France; Atmospheric and Oceanic Sciences Department, University of California, Los Angeles, Los Angeles, CA, United States; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, United States
Recommended Citation:
L'Hévéder B.,Codron F.,Ghil M.. Impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting[J]. Journal of Climate,2015-01-01,28(7)