DOI: 10.1175/JCLI-D-16-0349.1
Scopus记录号: 2-s2.0-85008675900
论文题名: The role of tropical interbasin SST gradients in forcing walker circulation trends
作者: Zhang L. ; Karnauskas K.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 2 起始页码: 499
结束页码: 508
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Crystal whiskers
; Earth atmosphere
; Nickel
; Surface waters
; Tropics
; Atlantic Ocean
; Atmospheric general circulation models
; Equatorial Pacific
; Historical simulation
; Indian ocean
; Sea surface temperature anomalies
; Tropical atlantic
; Walker circulation
; Oceanography
; sea surface temperature
; temperature anomaly
; temperature gradient
; trade wind
; trend analysis
; Walker circulation
; warming
; Atlantic Ocean
; Indian Ocean
; Pacific Ocean
英文摘要: The effects of externally forced tropical sea surface temperature (SST) anomalies on long-term Walker circulation changes are investigated through numerical atmospheric general circulation model (AGCM) experiments. In response to the observed tropics-wide SST trend, which exhibits a prominent interbasin warming contrast (IBWC) with smaller warming in the Pacific than the Indian and Atlantic Oceans that includes a weak La Niña-like pattern in the equatorial Pacific, pronounced low-level easterly anomalies emerge over the equatorial Pacific. Through sensitivity experiments, the intensification of the Pacific trade winds (PTWs) is attributable to the IBWC, whereas the slightly enhanced zonal SST gradient within the equatorial Pacific plays a small role relative to the observed IBWC. It is further demonstrated that the greater Indian Ocean warming forces low-level easterly anomalies over the entire equatorial Pacific, while the greater tropical Atlantic warming-driven enhancement of PTWs is located over the central equatorial Pacific. In contrast to observations, a negligible IBWC emerges in the tropical SST trends of CMIP5 historical simulations due to a strong El Niño-like warming in the tropical Pacific. Lacking the observed IBWC (and the observed enhancement of the zonal SST gradient within the equatorial Pacific), the PTWs in the CMIP5 ensemble can only weaken. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49829
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Zhang L.,Karnauskas K.B.. The role of tropical interbasin SST gradients in forcing walker circulation trends[J]. Journal of Climate,2017-01-01,30(2)