DOI: 10.1175/JCLI-D-15-0179.1
Scopus记录号: 2-s2.0-84962327083
论文题名: North Pacific subtropical mode water volume decrease in 2006-09 estimated from Argo observations: Influence of surface formation and basin-scale oceanic variability
作者: Cerovecki I. ; Giglio D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 6 起始页码: 2177
结束页码: 2199
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Budget control
; Atmosphere-ocean interactions
; Diabatic heating
; Interannual variability
; Oceanic variabilities
; Pacific decadal oscillation
; Variability
; Water mass
; Hydrographic surveys
; air-sea interaction
; annual variation
; Argo
; diabatic process
; Pacific Decadal Oscillation
; potential vorticity
; water mass
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Analysis of Argo temperature and salinity profiles (gridded at 0.5° × 0.5° resolution for 2005-12) shows a strong North Pacific Subtropical Mode Water (NPSTMW) volume and density decrease during 2006-09. In this time period, upper-ocean temperature, stratification, and potential vorticity (PV) all increased within the region in and around the NPSTMW low-PV pool, contributing to the NPSTMW volume decrease in two ways: (i) the volume of water satisfying the low-PV constraint that is part of the "mode water" definition decreased, and (ii) some water that was initially in the NPSTMW density range σθ = 25.0-25.5 kg m-3 was transformed into lighter water. Both changes in density and in PV in the NPSTMW region were a manifestation of basinwide changes. A positive PV anomaly started to propagate westward from the central Pacific in 2005, followed by a negative density anomaly in 2007, which caused a dramatic NPSTMW volume and density decrease. A Walin estimate of surface formation in the NPSTMW density range accounted better (although not entirely) for the interannual variability of the volume of water in the NPSTMW density range without imposing the PV < 2 × 10-10 m-1 s-1 constraint than did the same estimate with the PV constraint imposed. This underlines the importance of the PV constraint in identifying the mode water. The mode water evolution cannot be fully described from a density budget alone; rather, the PV budget must be considered simultaneously. © 2016 American Meteorological Society. 资助项目: DOE, U.S. Department of Energy
; NOAA, National Oceanic and Atmospheric Administration
; NSF, Norsk Sykepleierforbund
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50014
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; University of Washington, Seattle, WA, United States
Recommended Citation:
Cerovecki I.,Giglio D.. North Pacific subtropical mode water volume decrease in 2006-09 estimated from Argo observations: Influence of surface formation and basin-scale oceanic variability[J]. Journal of Climate,2016-01-01,29(6)