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Rapid acidification of mode and intermediate waters in the southwestern Atlantic Ocean.
- Source :
- Biogeosciences; 2015, Vol. 12 Issue 5, p1387-1401, 15p, 1 Black and White Photograph, 5 Charts, 4 Graphs
- Publication Year :
- 2015
-
Abstract
- Observations along the southwestern Atlantic WOCE A17 line made during the Dutch GEOTRACES-NL programme (2010-2011) were compared with historical data from 1994 to quantify the changes in the anthropogenic component of the total pool of dissolved inorganic carbon (ΔC<subscript>ant</subscript>). Application of the extended multi-linear regression (eMLR) method shows that the ΔC<subscript>ant</subscript> from 1994 to 2011 has largely remained confined to the upper 1000 dbar. The greatest changes occur in the upper 200 dbar in the Subantarctic Zone (SAZ), where a maximum increase of 37 μmol kg<superscript>-1</superscript> is found. South Atlantic Central Water (SACW) experienced the highest rate of increase in C<subscript>ant</subscript>, at 0.99 ± 0.14 µmol kg<superscript>-1</superscript> yr<superscript>-1</superscript>, resulting in a maximum rate of decrease in pH of 0.0016 yr<superscript>-1</superscript>. The highest rates of acidification relative to ΔC<subscript>ant</subscript>, however, were found in Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). The low buffering capacity of SAMW and AAIW combined with their relatively high rates of C<subscript>ant</subscript>, increase of 0.53 ± 0.11 and 0.36 ± 0.06 μmol kg<superscript>-1</superscript> yr<superscript>-1</superscript>, respectively, has lead to rapid acidification in the SAZ, and will continue to do so whilst simultaneously reducing the chemical buffering capacity of this significant CO<subscript>2</subscript> sink. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17264170
- Volume :
- 12
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Biogeosciences
- Publication Type :
- Academic Journal
- Accession number :
- 101617057
- Full Text :
- https://doi.org/10.5194/bg-12-1387-2015