DOI: 10.1175/JCLI-D-18-0434.1
Scopus记录号: 2-s2.0-85060974003
论文题名: ITCZ width controls on Hadley cell extent and eddy-driven jet position and their response to warming
作者: Watt-Meyer O. ; Frierson D.M.W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 4 起始页码: 1151
结束页码: 1166
语种: 英语
英文关键词: Climate change
; General circulation models
; Hadley circulation
; Intertropical convergence zone
; Storm tracks
Scopus关键词: Atmospheric temperature
; Cells
; Climate change
; Climate models
; Cytology
; Global warming
; Oceanography
; Surface properties
; Tropics
; Control simulation
; General circulation model
; Hadley circulation
; Intertropical convergence zone
; Precipitation patterns
; Storm track
; Surface temperatures
; Tropical precipitation
; Clouds
英文摘要: The impact of global warming-induced intertropical convergence zone (ITCZ) narrowing onto the higherlatitude circulation is examined in the GFDL Atmospheric Model, version 2.1 (AM2.1), run over zonally symmetric aquaplanet boundary conditions.Astriking reconfiguration of the deep tropical precipitation from double-peaked, off-equatorial ascent to a single peak at the equator occurs under a globally uniform + 4Ksea surface temperature (SST) perturbation. This response is found to be highly sensitive to the SST profile used to force the model. By making small (≤1K) perturbations to the surface temperature in the deep tropics, varying control simulation precipitation patterns with both single and double ITCZs are generated. Across the climatologies, narrower regions of ascent correspond to more equatorward Hadley cell edges and eddydriven jets. Under the global warming perturbation, the experiments in which there is narrowing of the ITCZ show significantly less expansion of the Hadley cell and somewhat less poleward shift of the eddy-driven jet than those without ITCZ narrowing. With a narrower ITCZ, the ascending air has larger zonal momentum, causing more westerly upper-tropospheric subtropical wind. In turn, this implies 1) the subtropical jet will become baroclinically unstable at a lower latitude and 2) the critical (zero wind) line will shift equatorward, allowing midlatitude eddies to propagate farther equatorward. Both of these mechanisms modify the Hadley cell edge position, and the latter affects the jet position. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117219
Appears in Collections: 气候变化与战略
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Recommended Citation:
Watt-Meyer O.,Frierson D.M.W.. ITCZ width controls on Hadley cell extent and eddy-driven jet position and their response to warming[J]. Journal of Climate,2019-01-01,32(4)