Reduced Antarctic meridional overturning circulation reaches the North Atlantic Ocean

被引：46
|
作者：
Johnson, Gregory C. [1 ,3 ]
Purkey, Sarah G. [1 ,3 ]
Toole, John M. [2 ]
机构：
[1] NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA
[2] Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA
[3] Univ Washington, Sch Oceanog, Seattle, WA 98195 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 22期
关键词：
D O I：
10.1029/2008GL035619
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We analyze abyssal temperature data in the western North Atlantic Ocean from the 1980s-2000s, showing that reductions in Antarctic Bottom Water (AABW) signatures have reached even that basin. Trans-basin oceanographic sections occupied along 52 degrees W from 1983-2003 and 66 degrees W from 1985-2003 quantify abyssal warming resulting from deepening of the strong thermal boundary between AABW and North Atlantic Deep Water (NADW), hence a local AABW volume reduction. Repeat section data taken from 1981-2004 along 24 degrees N also show a reduced zonal gradient in abyssal temperatures, consistent with decreased northward transport of AABW. The reduction in the Antarctic limb of the MOC within the North Atlantic highlights the global reach of climate variability originating around Antarctica. Citation: Johnson, G. C., S. G. Purkey, and J. M. Toole (2008), Reduced Antarctic meridional overturning circulation reaches the North Atlantic Ocean, Geophys. Res. Lett., 35, L22601, doi: 10.1029/2008GL035619.
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页数：5
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