DOI: 10.1175/JCLI-D-12-00834.1
Scopus记录号: 2-s2.0-84881652564
论文题名: Antarctic bottom water warming and freshening: Contributions to sea level rise, ocean freshwater budgets, and global heat gain
作者: Purkey S.G. ; Johnson G.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 16 起始页码: 6105
结束页码: 6122
语种: 英语
Scopus关键词: Antarctic Bottom Water
; Antarctic ice sheets
; Conductivity temperature depths
; Continental slope
; Freshwater fluxes
; Potential temperature
; Relative contribution
; South Indian Ocean
; Isotherms
; Sea level
; Thermal expansion
; Water
; Geographical regions
; continental rise
; continental slope
; potential temperature
; sea level change
; sea surface salinity
; thermal expansion
; water mass
; Antarctica
; Indian Ocean
; Indian Ocean (South)
; Pacific Ocean
; Pacific Ocean (South)
; Southern Ocean
; Weddell Sea
英文摘要: Freshening and warming of Antarctic Bottom Water (AABW) between the 1980s and 2000s are quantified, assessing the relative contributions of water-mass changes and isotherm heave. The analysis uses highly accurate, full-depth, ship-based, conductivity-temperature-depth measurements taken along repeated oceanographic sections around the Southern Ocean. Fresher varieties of AABW are present within the South Pacific and south Indian Oceans in the 2000s compared to the 1990s, with the strongest freshening in the newest waters adjacent to the Antarctic continental slope and rise indicating a recent shift in the salinity of AABW produced in this region. Bottom waters in the Weddell Sea exhibit significantly less water-mass freshening than those in the other two southern basins. However, a decrease in the volume of the coldest, deepest waters is observed throughout the entire Southern Ocean. This isotherm heave causes a salinification and warming on isobaths from the bottom up to the shallow potential temperature maximum. The water-mass freshening of AABWin the Indian and PacificOcean sectors is equivalent to a freshwater flux of 73626Gtyr21, roughly half of the estimated recent mass loss of theWest Antarctic Ice Sheet. Isotherm heave integrated below 2000m and south of 308S equates to a net heat uptake of 34 6 14 TW of excess energy entering the deep ocean from deep volume loss of AABW and 0.37 6 0.15mmyr21 of sea level rise from associated thermal expansion. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51753
Appears in Collections: 气候变化事实与影响
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作者单位: School of Oceanography, University of Washington, and NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, United States
Recommended Citation:
Purkey S.G.,Johnson G.C.. Antarctic bottom water warming and freshening: Contributions to sea level rise, ocean freshwater budgets, and global heat gain[J]. Journal of Climate,2013-01-01,26(16)