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Issue Information
Publication year - 2015
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1002/gbc.20194
Subject(s) - photic zone , silicic acid , fractionation , geology , oceanography , isotopes of silicon , dissolution , isotope , silicon , isotope fractionation , mineralogy , chemistry , phytoplankton , chromatography , physics , organic chemistry , quantum mechanics , nutrient
Cover: Holzer and Brzezinski [doi: 10.1002/2014GB004967 ] added isotope fractionation to a steady‐state data‐constrained model of the oceanic silicon cycle to calculate the global distribution of the isotopes of dissolved silicon, plotted here as zonal averages for the global ocean (GLB) and for each basin (ATL, PAC, IND). The δ 30 Si isotope ratio was partitioned into preformed and regenerated contributions traced back to their origin in the euphotic zone. This analysis showed that regenerated silicic acid, and possibly fractionation on opal dissolution, control the deep vertical gradients of δ 30 Si, such as the observed weak vertical gradients in the deep South Pacific that are captured in the PAC panel. See pp. 267–287.