DOI: 10.1175/JCLI-D-17-0852.1
Scopus记录号: 2-s2.0-85047055346
论文题名: Concurrent changes to hadley circulation and the meridional distribution of tropical cyclones
作者: Studholme J. ; Gulev S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4367
结束页码: 4389
语种: 英语
英文关键词: Atmosphere
; Hadley circulation
; Tropical cyclones
Scopus关键词: Earth atmosphere
; Hurricanes
; Oceanography
; Storms
; Surface waters
; Eastern north pacific
; Hadley circulation
; Interannual variability
; Meridional distribution
; Paleoclimate reconstruction
; Sea Surface Temperature gradients
; Tropical cyclone
; Western North Pacific
; Tropics
英文摘要: Poleward trends in seasonal-mean latitudes of tropical cyclones (TCs) have been identified in direct observations from 1980 to the present. Paleoclimate reconstructions also indicate poleward-equatorward migrations over centennial-millennial time scales. Hadley circulation (HC) is often both implicitly and explicitly invoked to provide dynamical linkages to these shifts, although no direct analysis of concurrent changes in the recent period has been presented. Here, the observational TC record (1981-2016) and ERA-Interim, JRA-55, and MERRA-2 are studied to examine potential relationships between the two. A zonally asymmetric HC is defined by employing Helmholtz theory for vector decomposition, and this permits the derivation of novel HC diagnostics local to TC basins. Coherent variations in both long-term linear trends and detrended interannual variability are found. TC genesis and lifetime maximum intensity latitudes share trend sign and magnitude with shifts in local HC extent, with rates being approximately 0.25° ± 0.1° lat decade-1. Both these life cycle stages in hemispheric means and all Pacific TC basins, as well as poleward-extreme North Atlantic lysis latitudes, shared approximately 35% of their interannual variability with HC extent. Local HC intensity is linked only to eastern North Pacific TC latitudes, where strong local overturning corresponds to equatorward TC shifts. Examination of potential dynamical linkages implicates La Niña-like sea surface temperature gradients to poleward HC termini. This corresponds to increased tropical and reduced subtropical vertical wind shear everywhere except in the North Atlantic and western North Pacific, where the opposite is true. These results quantify a long-hypothesized link between TCs and the large-scale oceanic-atmospheric state. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111533
Appears in Collections: 气候减缓与适应
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作者单位: Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow State University, Moscow, Russian Federation
Recommended Citation:
Studholme J.,Gulev S.. Concurrent changes to hadley circulation and the meridional distribution of tropical cyclones[J]. Journal of Climate,2018-01-01,31(11)