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Increase of total alkalinity due to shoaling of aragonite saturation horizon in the Pacific and Indian Oceans: Influence of anthropogenic carbon inputs
Author(s) -
Sarma V. V. S. S.,
Ono Tsuneo,
Saino Toshiro
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015135
Subject(s) - aragonite , alkalinity , oceanography , saturation (graph theory) , ocean acidification , shoaling and schooling , pacific ocean , geology , indian ocean , environmental science , seawater , mineralogy , calcite , chemistry , mathematics , organic chemistry , combinatorics
Aragonite saturation horizon (ASH) shallowed significantly by 25 to 155 m and 16 to 124 m in the Pacific and Indian Ocean respectively in two decades. Apparent oxygen utilization (AOU) increased by 3 to 34 and 0.5 to 31.5 μmol kg −1 in the Pacific and Indian Ocean respectively at the depth of ASH during this period. DIC increased by 12.5 to 36.8 and 5.5 to 32 μmol kg −1 in the vicinity of ASH in the Pacific and Indian Ocean respectively due to combined effect of increased anthropogenic CO 2 and change in AOU. TA increased significantly by 5 to 10 and 4 to 9.2 μmol kg −1 in the Pacific and Indian Oceans respectively at the ASH most likely as a result of aragonite dissolution. The upward migration of ASH solely due to anthropogenic CO 2 amounted to 6 to 58 m in the Pacific and 4 to 44 m in the Indian Ocean.