DOI: 10.1002/2013GL058842
论文题名: Equatorial signatures of the Pacific Meridional Modes: Dependence on mean climate state
作者: Zhang H. ; Deser C. ; Clement A. ; Tomas R.
刊名: Geophysical Research Letters
ISSN: 0094-10487
EISSN: 1944-10218
出版年: 2014
卷: 41, 期: 2 起始页码: 568
结束页码: 574
语种: 英语
英文关键词: asymmetry
; mean climate
; Meridional Mode
; trade winds
; WES feedback
Scopus关键词: Earth sciences
; Geophysics
; asymmetry
; Atmospheric general circulation models
; Extratropical atmospheric variability
; Intertropical convergence zone
; mean climate
; Meridional Mode
; Paleoclimate studies
; Trade winds
; Commerce
; asymmetry
; atmospheric general circulation model
; atmospheric modeling
; climate feedback
; evaporation
; heating
; intertropical convergence zone
; marine atmosphere
; meridional circulation
; paleoclimate
; sea surface temperature
; slab
; trade wind
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Sector
; Southern Ocean
英文摘要: Extratropical atmospheric variability can impact tropical climate in the Pacific sector via the Pacific Meridional Modes (PMMs). The South PMM (SPMM) has a larger equatorial signature than the North PMM (NPMM) for the same amount of extratropical variability. Here we explain this interhemispheric asymmetry using an atmospheric general circulation model coupled to a slab ocean model. By imposing an anomalous interhemispheric heating gradient, we strengthen the northeasterly trades and weaken the southeasterly trades, shifting the Intertropical Convergence Zone south of the equator. As a result, the SPMM no longer influences the equatorial region while the NPMM shows strengthened linkages to the central-western equatorial Pacific. By demonstrating that background winds determine the propagation of the wind-evaporation-sea surface temperature feedback fundamental for the PMMs, we conclude that the interhemispheric asymmetry between the PMMs is largely attributed to the asymmetric mean trades in the Pacific. The results have implications for both paleoclimate studies and model development. ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893009837&doi=10.1002%2f2013GL058842&partnerID=40&md5=cf5fdbbf7f51b9020867bd161bb68f84
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7751
Appears in Collections: 气候减缓与适应
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作者单位: Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
Recommended Citation:
Zhang H.,Deser C.,Clement A.,et al. Equatorial signatures of the Pacific Meridional Modes: Dependence on mean climate state[J]. Geophysical Research Letters,2014-01-01,41(2).