DOI: 10.1175/JCLI-D-11-00612.1
Scopus记录号: 2-s2.0-84863908714
论文题名: Global contraction of Antarctic Bottom Water between the 1980s and 2000s
作者: Purkey S.G. ; Johnson G.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 17 起始页码: 5830
结束页码: 5844
语种: 英语
Scopus关键词: Abyssal circulation
; Bottom current
; Climate variability
; Meridional overturning circulations
; Southern ocean
; Thermohaline circulations
; Budget control
; Climatology
; Geographical regions
; abyssal circulation
; Antarctic Bottom Water
; bottom current
; bottom water
; climate variation
; deep water
; heat budget
; hydrography
; inflow
; meridional circulation
; outflow
; overturn
; sea surface temperature
; thermohaline circulation
; water column
; Brazil
; Pacific Ocean
; Southern Ocean
英文摘要: A statistically significant reduction in Antarctic Bottom Water (AABW) volume is quantified between the 1980s and 2000s within the Southern Ocean and along the bottom-most, southern branches of the meridional overturning circulation (MOC). AABW has warmed globally during that time, contributing roughly 10% of the recent total ocean heat uptake. This warming implies a global-scale contraction of AABW. Rates of change in AABW-related circulation are estimated in most of the world's deep-ocean basins by finding average rates of volume loss or gain below cold, deep potential temperature (Θ) surfaces using all available repeated hydrographic sections. The Southern Ocean is losing water below Θ=0 C at a rate of-8 (±2 6)×10 6 m 3 s -1. This bottom water contraction causes a descent of potential isotherms throughout much of the water column until a near-surface recovery, apparently through a southward surge of Circumpolar Deep Water from the north. To the north, smaller losses of bottom waters are seen along three of the four main northward outflow routes of AABW. Volume and heat budgets below deep, cold u surfaces within the Brazil and Pacific basins are not in steady state. The observed changes in volume and heat of the coldest waters within these basins could be accounted for by small decreases to the volume transport or small increases to u of their inflows, or fractional increases in deep mixing. The budget calculations and global contraction pattern are consistent with a global-scale slowdown of the bottom, southern limb of the MOC. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52264
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Oceanography, University of Washington, Seattle, WA, United States; NOAA, Pacific Marine Environmental Laboratory, Seattle, WA, United States
Recommended Citation:
Purkey S.G.,Johnson G.C.. Global contraction of Antarctic Bottom Water between the 1980s and 2000s[J]. Journal of Climate,2012-01-01,25(17)