DOI: 10.1002/2015GB005275
Scopus记录号: 2-s2.0-84961684191
论文题名: Mercury presence and speciation in the South Atlantic Ocean along the 40°S transect
作者: Bratkič A ; , Vahčič M ; , Kotnik J ; , Obu Vazner K ; , Begu E ; , Woodward E ; M ; S ; , Horvat M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 105
结束页码: 119
语种: 英语
英文关键词: biogeochemical cycling
; GEOTRACES
; mercury
; South Atlantic Ocean
; speciation
Scopus关键词: carbon cycle
; chlorophyll a
; concentration (composition)
; marine environment
; mercury (element)
; mixed layer
; oxygen
; speciation (chemistry)
; tracer
; transect
; transformation
; Atlantic Ocean
; Atlantic Ocean (South)
; Gough Island
; Saint Helena
; Tristan da Cunha
英文摘要: Mercury (Hg) natural biogeochemical cycle is complex and a significant portion of biological and chemical transformation occurs in the marine environment. To better understand the presence and abundance of Hg species in the remote ocean regions, waters of South Atlantic Ocean along 40°S parallel were investigated during UK-GEOTRACES cruise GA10. Total mercury (THg), methylated mercury (MeHg), and dissolved gaseous mercury (DGM) concentrations were determined. The concentrations were very low in the range of pg/L (femtomolar). All Hg species had higher concentration in western than in eastern basin. THg did not appear to be a useful geotracer. Elevated methylated Hg species were commonly associated with low-oxygen water masses and occasionally with peaks of chlorophyll a, both involved with carbon (re)cycling. The overall highest MeHg concentrations were observed in the mixed layer (500m) and in the vicinity of the Gough Island. Conversely, DGM concentrations showed distinct layering and differed between the water masses in a nutrient-like manner. DGM was lowest at surface, indicating degassing to the atmosphere, and was highest in the Upper Circumpolar Deep Water, where the oxygen concentration was lowest. DGM increased also in Antarctic Bottom Water. At one station, dimethylmercury was determined and showed increase in region with lowest oxygen saturation. Altogether, our data indicate that the South Atlantic Ocean could be a source of Hg to the atmosphere and that its biogeochemical transformations depend primarily upon carbon cycling and are thereby additionally prone to global ocean change. ©2016. 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/77891
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, Jožef Stefan Institute, Ljubljana, Slovenia; International Postgraduate School Jožef Stefan, Jamova cesta 39, Ljubljana, Slovenia; IEI, Institute for Ecological Engineering D.o.o., Maribor, Slovenia; Plymouth Marine Laboratory, Plymouth, United Kingdom
Recommended Citation:
Bratkič A,, Vahčič M,, Kotnik J,et al. Mercury presence and speciation in the South Atlantic Ocean along the 40°S transect[J]. Global Biogeochemical Cycles,2016-01-01,30(2)