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Decadal changes in the aragonite and calcite saturation state of the Pacific Ocean
Author(s) -
Feely Richard A.,
Sabine Christopher L.,
Byrne Robert H.,
Millero Frank J.,
Dickson Andrew G.,
Wanninkhof Rik,
Murata Akihiko,
Miller Lisa A.,
Greeley Dana
Publication year - 2012
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/2011gb004157
Subject(s) - aragonite , oceanography , ocean gyre , calcite , saturation (graph theory) , ocean acidification , seawater , geology , shoaling and schooling , carbonate , ocean current , environmental science , subtropics , mineralogy , chemistry , ecology , mathematics , combinatorics , organic chemistry , biology
Based on measurements from the WOCE/JGOFS global CO 2 survey, the CLIVAR/CO 2 Repeat Hydrography Program and the Canadian Line P survey, we have observed an average decrease of 0.34% yr −1 in the saturation state of surface seawater in the Pacific Ocean with respect to aragonite and calcite. The upward migrations of the aragonite and calcite saturation horizons, averaging about 1 to 2 m yr −1 , are the direct result of the uptake of anthropogenic CO 2 by the oceans and regional changes in circulation and biogeochemical processes. The shoaling of the saturation horizon is regionally variable, with more rapid shoaling in the South Pacific where there is a larger uptake of anthropogenic CO 2 . In some locations, particularly in the North Pacific Subtropical Gyre and in the California Current, the decadal changes in circulation can be the dominant factor in controlling the migration of the saturation horizon. If CO 2 emissions continue as projected over the rest of this century, the resulting changes in the marine carbonate system would mean that many coral reef systems in the Pacific would no longer be able to sustain a sufficiently high rate of calcification to maintain the viability of these ecosystems as a whole, and these changes perhaps could seriously impact the thousands of marine species that depend on them for survival.