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• W4230333019 abstract "Abstract. The distributions of the bio-essential trace element dissolved Co (DCo) and the apparent particulate Co (PCo) are presented along the GEOTRACES-A02 deep section from 64° N to 50° S in the West Atlantic Ocean. PCo was determined as the difference between total cobalt (TCo, unfiltered samples) and DCo. DCo concentrations ranged from 14.7 pM to 94.3 pM, and PCo concentrations from undetectable values to 18.8 pM. The lowest DCo concentrations were observed in the subtropical domains, and the highest in the low-oxygenated Atlantic Central Waters (ACW) that appeared to be the major reservoir of DCo in the West Atlantic. In the Antarctic Bottom Waters, the enrichment in DCo with ageing of the water-mass can be related to suspension and redissolution of bottom sediments a well as diffusion of DCo from abyssal sediments. Mixing and dilution of deep water-masses, rather than scavenging of DCo onto settling particles, generated the meridional decrease of DCo along the southward large-scale circulation in the deep West Atlantic. Furthermore the apparent scavenged profile of DCo observed in the deep waters likely resulted from the persistence of relatively high concentrations in intermediate waters and low DCo concentrations in underlaying bottom waters. We suggested that the 2010 Icelandic volcanic eruption can be a source of DCo that could have been transported in the core of the North-East Atlantic Deep Waters. At intermediate depths, the high concentrations of DCo recorded in the ACW linearly correlated with the apparent utilization of oxygen (AOU), indicating that remineralization of DCo can be significant (representing up to 29% of the DCo present). Furthermore the preferential remineralization of phosphate (P) compared to Co in these low-oxygenated waters suggested a decoupling between the deep cycles of P and Co. The vertical diffusion of DCo from the ACW appeared to be a significant source of DCo into the surface waters of the equatorial domain. Summarizing the dilution and mixing processes rather than scavenging of DCo, and the remineralization can be the two major pathways controlling the cycling of DCo in the intermediate and deep West Atlantic." @default.
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• W4230333019 date "2013-10-16" @default.
• W4230333019 modified "2023-10-03" @default.
• W4230333019 title "Physical and remineralization processes govern the cobalt distribution in the deep western Atlantic ocean" @default.
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• W4230333019 doi "https://doi.org/10.5194/bgd-10-15951-2013" @default.
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