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Role of colloids in upper ocean biogeochemistry in the northeast Pacific Ocean elucidated from ²³⁸U-²³⁴Th disequilibria

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  • Detailed upper ocean profiles of 234Th in dissolved (< 10,000 Daltons), colloidal (10,000 Da–O.45 μm), and particulate (>0.45 μm) forms were measured at a station (46º45′N, 126ºW) in the northeast Pacific Ocean. On average, dissolved, colloidal, and particulate 234Th accounted for ~78, 12, and 10% of the total 234Th in the cuphotic zone (()–100 m). A highly positive correlation exists between colloidal 234Th and chlorophyll a; both are characterized by higher concentrations in surface waters, a subsurface maximum at 55 m in the seasonal thermocline, and undetectable levels below the euphotic zone. POC : Chl α ratios in the water column suggest phytoplankton as primary producers of the colloidal material. Scavenging residence times of dissolved, colloidal, and particulate 234Th with respect to their removal processes in the euphotic zone are ~50, 6, and 8 d. The scavenging rate constant of Th apparently increases with the concentration of colloids.
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  • Huh, C., & Prahl, F. G. (1995). Role of colloids in upper ocean biogeochemistry in the northeast Pacific Ocean elucidated from ²³⁸U-²³⁴Th disequilibria. Limnology and oceanography, 43(3), 528-532.
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  • 40
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