Recent western South Atlantic bottom water warming
MetadataShow full item record
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.
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.
Suggested CitationArticle: Johnson, Gregory C., Doney, Scott C., "Recent western South Atlantic bottom water warming", Geophysical Research Letters 33 (2006): L14614, DOI:10.1029/2006GL026769, https://hdl.handle.net/1912/1213
Showing items related by title, author, creator and subject.
Trans-equatorial bottom water flow in the western Atlantic : volume XLVI in a series of reports presenting data from moored current meters Tarbell, Susan A.; Whitehead, John A.; Hall, Melinda M.; McCartney, Michael S. (Woods Hole Oceanographic Institution, 1997-02)Current and temperature measurements from Vector Averaging Current Meters (VACMs) deployed from September 1992 to June 1994 as part of the Deep Basin Experiment (DBE) measuring the trans-equatorial water flow are presented. ...
Changes in bottom water physical properties above the mid-Atlantic ridge flank in the Brazil Basin Zhao, Jian; Thurnherr, Andreas M. (John Wiley & Sons, 2018-01-30)Warming of abyssal waters in recent decades has been widely documented around the global ocean. Here repeat hydrographic data collected in 1997 and 2014 near a deep fracture zone canyon in the eastern Brazil Basin are used ...
Total and phytoplankton mediated bottom-up control of bacterioplankton change with temperature in NE Atlantic shelf waters Moran, Xose Anxelu G.; Calvo-Diaz, Alejandra; Ducklow, Hugh W. (Inter-Research, 2010-01-20)The regulation of heterotrophic bacterial growth by resource supply (bottom-up control) was temperature-dependent in our analysis of data obtained during 2006 in the euphotic layer of the southern Bay of Biscay (NE Atlantic) ...