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Dimethylmercury in coastal upwelling waters, Monterey Bay, California

Citation

Conaway, CH and Black, FJ and Gault-Ringold, M and Pennington, JT and Chavez, FP and Flegal, AR, Dimethylmercury in coastal upwelling waters, Monterey Bay, California, Environmental Science and Technology, 43, (5) pp. 1305-1309. ISSN 0013-936X (2009) [Refereed Article]

Copyright Statement

Copyright 2009 American Chemical Society

DOI: doi:10.1021/es802705t

Abstract

Depth profiles of dimethylmercury (DMHg) concentration were determined at nearshore to offshore sites in Monterey Bay, California. The onset of spring upwelling in the bay was accompanied by increases in DMHg concentrations. Profiles show DMHg increasing gradually with depth in fall and winter from <0.03 pM at the surface to 0.5 pM at 200 m. During the spring, DMHg concentrations increased between 30 and 100 m, first within Monterey Bay, then offshore. This change was accompanied by an increase in DMHg concentrations in the surface water DMHg between fall/winter (<0.03 pM) and spring (0.06−0.29 pM). Microbial activity associated with the remineralization of sinking organic matter produced by the high primary production in the bay may result in the relatively high DMHg in subsurface water in the bay, which when upwelled may facilitate the incorporation of organomercury into biota. As a result, productive coastal upwelling areas may represent an important source of methylated mercury to surface waters, and thus be an important source of mercury to marine ecosystems.

Item Details

Item Type:Refereed Article
Keywords:dimethylmercury, upwelling, Monterey Bay
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
UTAS Author:Gault-Ringold, M (Dr Melanie East)
ID Code:125200
Year Published:2009
Web of Science® Times Cited:35
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2018-04-06
Last Modified:2018-05-07
Downloads:0

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