Premium
The Indian Ocean 13 C Suess Effect
Author(s) -
Sonnerup Rolf E.,
Quay Paul D.,
McNichol Ann P.
Publication year - 2000
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 - 10.1029/1999gb001244
Subject(s) - hydrography , oceanography , pacific ocean , equator , ocean current , pacific decadal oscillation , deep sea , geology , seawater , ocean heat content , extrapolation , environmental science , climatology , latitude , geodesy , mathematical analysis , mathematics
The δ 13 C of dissolved inorganic carbon (DIC) decrease (the 13 C Suess effect) in the Indian Ocean was calculated using a multiparameter linear regression comparison of the 1978 Geochemical Ocean Sections Study and 1995 World Ocean Circulation Experiment δ 13 C of DIC, hydrographic, and nutrient data. The surface ocean δ 13 C decrease rate along 80° and 115°E ranged from approximately −0.1‰ decade −1 at 55°S to a maximum of approximately −0.18‰ decade −1 at ∼ 35°S and decreased northward to around −0.13‰ decade −1 at the equator. Using a global extrapolation based on ocean model results [ Bacastow et al. , 1996] and previous δ 13 C changes calculated from 1970 to 1993 station reoccupations in the Pacific Ocean and based on preformed δ 13 C versus chlorofluorocarbon age trends in the Indian, Pacific, and Atlantic Oceans [ Sonnerup et al. , 1999], an ocean‐wide average surface ocean δ 13 C rate of change of −0.15 to −0.17‰ decade −1 was estimated. The average depth‐integrated δ 13 C change rate between 1978 and 1995 along 80° and 115°E was −6.9 ± 0.5‰ m yr −1 from 58°S to 5°N.