DOI: 10.1002/2015GB005120
Scopus记录号: 2-s2.0-85027956256
论文题名: Mercury species concentrations and fluxes in the Central Tropical Pacific Ocean
作者: Munson K ; M ; , Lamborg C ; H ; , Swarr G ; J ; , Saito M ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 5 起始页码: 656
结束页码: 676
语种: 英语
英文关键词: mercury
; oxygen minimum zone
; sinking fluxes
; speciation
Scopus关键词: bioaccumulation
; mercury (element)
; oxygen minimum layer
; speciation (chemistry)
; toxicity test
; water mass
; Pacific Ocean
; Pacific Ocean (Central)
英文摘要: The formation of the toxic and bioaccumulating monomethylmercury (MMHg) in marine systems is poorly understood, due in part to sparse data from many ocean regions. We present dissolved mercury (Hg) speciation data from 10 stations in the North and South Equatorial Pacific spanning large water mass differences and gradients in oxygen utilization. We also compare the mercury content in suspended particles from six stations and sinking particles from three stations to constrain local Hg sources and sinks. Concentrations of total Hg (THg) and methylated Hg in the surface and intermediate waters of the Equatorial and South Pacific suggest Hg cycling distinct from that of the North Pacific gyre. Maximum concentrations of 180fM for both MMHg and dimethylmercury (DMHg) are observed in the Equatorial Pacific. South of the equator, concentrations of MMHg and DMHg are less than 100fM. Sinking fluxes of particulate THg can reasonably explain the shape of dissolved THg profiles, but those of MMHg are too low to account for dissolved MMHg profiles. However, methylated Hg species are lower than predicted from remineralization rates based on North Pacific data, consistent with limitation of methylation in Equatorial and South Pacific waters. Full water column depth profiles were also measured for the first time in these regions. Concentrations of THg are elevated in deep waters of the North Pacific, compared to those in the intermediate and surface waters, and taper off in the South Pacific. Comparisons with previous measurements from nearby regions suggest little enrichment of THg or MMHg over the past 20years. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77975
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; MIT/WHOI Joint Program in Chemical Oceanography, Woods Hole, MA, United States; Department of Ocean Sciences, University of California, Santa Cruz, CA, United States
Recommended Citation:
Munson K,M,, Lamborg C,et al. Mercury species concentrations and fluxes in the Central Tropical Pacific Ocean[J]. Global Biogeochemical Cycles,2015-01-01,29(5)