DOI: 10.1175/JCLI-D-14-00811.1
Scopus记录号: 2-s2.0-84980335789
论文题名: Predictive skill for regional interannual steric sea level and mechanisms for predictability
作者: Polkova I. ; Köhl A. ; Stammer D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 18 起始页码: 7407
结束页码: 7419
语种: 英语
Scopus关键词: Mechanical waves
; Oceanography
; SPICE
; Tropics
; Coupled models
; Forecast verification/skill
; Hindcasts
; Interannual variability
; Rossby wave
; Sea level
; annual variation
; hindcasting
; mixed layer
; Rossby wave
; sea level change
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (Subtropical)
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (Subtropical)
; Southern Ocean
英文摘要: Based on decadal hindcasts initialized every five years over the period 1960-2000, the predictive skill of annual-mean regional steric sea level and associated mechanisms are investigated. Predictive skill for steric sea level is found over large areas of the World Ocean, notably over the subtropical Atlantic and Pacific Oceans, along the path of the North Atlantic Current, and over the Indian and Southern Oceans. Mechanisms for the predictability of the thermosteric and halosteric contributions to the steric signal are studied by separating these components into signals originating from processes within and beneath the mixed layer. Contributions originating from below the mixed layer are further decomposed into density-related (isopycnal motion term) and density-compensated (spice term) changes. In regions of the subtropical Pacific and Atlantic Oceans, predictive skill results from the interannual variability associated with the contribution from isopycnal motion to thermosteric sea level. Skill related to thermosteric mixed layer processes is found to be important in the subtropical Atlantic, while the spice contribution shows skill over the subpolar North Atlantic. In the subtropics, the high predictive skill can be rationalized in terms of westward-propagating baroclinic Rossby waves for a lead time of 2-5 yr, as demonstrated using an initialized Rossby wave model. Because of the low Rossby wave speed in high latitudes, this process is not separable from the persistence there. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50380
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Oceanography, Center for Earth System Research and Sustainability, University of Hamburg, Hamburg, Germany
Recommended Citation:
Polkova I.,Köhl A.,Stammer D.. Predictive skill for regional interannual steric sea level and mechanisms for predictability[J]. Journal of Climate,2015-01-01,28(18)