Changes in deep-water CO2 concentrations over the last several decades determined from discrete pCO(2) measurements SCIE SCOPUS

Cited 14 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Changes in deep-water CO2 concentrations over the last several decades determined from discrete pCO(2) measurements
Author(s)
Wanninkhof, Rik; Park, Geun-Ha; Takahashi, Taro; Feely, Richard A.; Bullister, John L.; Doney, Scott C.
Publication Year
2013-04
Abstract
Detection and attribution of hydrographic and biogeochemical changes in the deep ocean are challenging due to the small magnitude of their signals and to limitations in the accuracy of available data. However, there are indications that anthropogenic and climate change signals are starting to manifest at depth. The deep ocean below 2000 m comprises about 50% of the total ocean volume, and changes in the deep ocean should be followed over time to accurately assess the partitioning of anthropogenic carbon dioxide (CO2) between the ocean, terrestrial biosphere, and atmosphere. Here we determine the changes in the interior deep-water inorganic carbon content by a novel means that uses the partial pressure of CO2 measured at 20 degrees C, pCO(2)(20), along three meridional transects in the Atlantic and Pacific oceans. These changes are measured on decadal time scales using observations from the World Ocean Circulation Experiment (WOCE)/World Hydrographic Program (WHP) of the 1980s and 1990s and the CLIVAR/CO2 Repeat Hydrography Program of the past decade. The pCO(2)(20) values show a consistent increase in deep water over the time period. Changes in total dissolved inorganic carbon (DIC) content in the deep interior are not significant or consistent, as most of the signal is below the level of analytical uncertainty. Using an approximate relationship between pCO(2)(20) and DIC change, we infer DIC changes that are at the margin of detectability. However, when integrated on the basin scale, the increases range from 8-40% of the total specific water column changes over the past several decades. Patterns in chlorofluorocarbons (CFCs), along with output from an ocean model, suggest that the changes in pCO(2)(20) and DIC are of anthropogenic origin. Published by Elsevier Ltd.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3200
DOI
10.1016/j.dsr.2012.12.005
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.74, pp.48 - 63, 2013
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
GOVERNING INTERANNUAL VARIABILITY; NORTH-ATLANTIC OCEAN; ANTHROPOGENIC CO2; BOTTOM WATER; CARBON-DIOXIDE; CLIMATE; STORAGE; SEA; DISTRIBUTIONS; FUGACITY
Keywords
Ocean; Carbon dioxide; CO2 sink; Anthropogenic carbon; Deep-water
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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