DOI: 10.1175/JCLI-D-13-00102.1
Scopus记录号: 2-s2.0-84907828141
论文题名: Origin of decadal-scale, eastward-propagating heat content anomalies in the North Pacific
作者: Taguchi B. ; Schneider N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 20 起始页码: 7568
结束页码: 7586
语种: 英语
Scopus关键词: North Pacific
; air-sea interaction
; annual variation
; buoyancy
; decadal variation
; heat flux
; oceanic front
; oceanic general circulation model
; Rossby wave
; timescale
; Kuroshio Extension
; Oyashio Region
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Upper ocean heat content (OHC) is at the heart of natural climate variability on interannual-to-decadal time scales, providing climate memory and the source of decadal prediction skill. In the midlatitude North Pacific Ocean, OHC signals are often found to propagate eastward as opposed to the frequently observed westward propagation of sea surface height, another variable that represents the ocean subsurface state. This dichotomy is investigated using a 150-yr coupled GCMintegration. Simulated OHC signals are distinguished in terms of two processes that can support eastward propagation: higher baroclinic Rossby wave (RW) modes that are associated with density perturbation, and spiciness anomalies due to density-compensated temperature and salinity anomalies. The analysis herein suggests a unique role of the Kuroshio-Oyashio Extension (KOE) region as an origin of the spiciness and higher mode RWsignals.Wind-forced, westward-propagating equivalent barotropic RWs cause meridional shifts of the subarctic front in the KOE region. The associated anomalous circulation crossesmean temperature and salinity gradients and thereby generates spiciness anomalies. These anomalies are advected eastward by themean currents,while the associated surface temperature anomalies are damped by air- sea heat exchange. The accompanying surface buoyancy flux generates higher baroclinic, eastward-propagating RWs. The results suggest that the largeOHC variability in the western boundary currents and their extensions is associated with the spiciness gradients and axial variability of oceanic fronts. © 2014 American Meteorological Society. 资助项目: NOAA, National Aeronautics and Space Administration
; NASA, National Aeronautics and Space Administration
; NSF, National Aeronautics and Space Administration
; NSF, National Aeronautics and Space Administration
; NSF, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51359
Appears in Collections: 气候变化事实与影响
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作者单位: Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; International Pacific Research Center, Department of Oceanography, University of Hawai'i at Manoa, Honolulu, HI, United States
Recommended Citation:
Taguchi B.,Schneider N.. Origin of decadal-scale, eastward-propagating heat content anomalies in the North Pacific[J]. Journal of Climate,2014-01-01,27(20)