Publication Date:
2022-05-26
Description:
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 33 (2006): L14614, doi:10.1029/2006GL026769.
Description:
Potential temperature differences are computed from hydrographic sections
transiting the western basins of the South Atlantic Ocean from 60°S to the equator in
2005/2003 and 1989/1995. While warming is observed throughout much of the water
column, the most statistically significant warming is about +0.04°C in the bottom 1500
dbar of the Brazil Basin, with similar (but less statistically significant) warming signals in
the abyssal Argentine Basin and Scotia Sea. These abyssal waters of Antarctic origin
spread northward in the South Atlantic. The observed abyssal Argentine Basin warming
is of a similar magnitude to that previously reported between 1980 and 1989. The Brazil
Basin abyssal warming is similar in size to and consistent in timing with previously
reported changes in abyssal southern inflow and northern outflow. The temperature
changes reported here, if they were to hold throughout the abyssal world ocean, would
contribute substantially to global ocean heat budgets.
Description:
The 2005 and 2003 cruises on the NOAA Ship Ronald Brown are
part of the NOAA/NSF funded U.S. CLIVAR/CO2 Repeat Hydrography Program. The
NOAA Office of Oceanic and Atmospheric Research and the NOAA Climate Program
Office further supported GCJ.
Keywords:
Antarctic bottom water
;
Brazil Basin
;
Atlantic Ocean
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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