Evidence for Dynamic Air-Water Coupling and Cycling of Persistent Organic Pollutants over the Open Atlantic Ocean

Foday M.Jaward; Jonathan L.Barber; Kees BooijJordi DachsRainer LohmannKevin C.Jones

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Evidence for Dynamic Air-Water Coupling and Cycling of Persistent Organic Pollutants over the Open Atlantic Ocean

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Ship-board airsamples collected between The Netherlands and South Africa in January-February 2001 were analyzed for PCBs and selected organochlorine compounds.Broad latitudinal trends in compound concentrations were influenced by proximity to source areas,land,and air mass origin.Lowest concentrations were observed in the remote south Atlantic (1-32° S),where sum_7PCB concentrations were ~10 pg m~(-3).Here,a diurnal cycle was noted for some PCB congeners,with the daytime concentrations higher than the nighttime concentrations,typically by a factor of 1.5-2.5.The data are consistent with a close coupling of air-open ocean concentrations,which has important implications for future rates of POP removal from the global "recyclable pool".The observations are discussed in the context of the potential controlling variables.Interactions between the phytoplankton and the dissolved phase are implicated in controlling the observations made here and a hypothesis to explain the cycling trends is presented.However,the precise mechanisms remain unclear; further studies are urgently required to elucidate them.

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《Environmental Science & Technology: ES&T》 |2004年第9期|2617-2625|共9页
作者
Foday M.Jaward; Jonathan L.Barber; Kees BooijJordi DachsRainer LohmannKevin C.Jones;
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作者单位

Department of Environmental Science, Institute of Environmental and Natural Sciences, Lancaster University, Lancaster, LA1 4YQ, ROYAUME-UNI;

Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, PAYS-BAS;

Department of Environmental Chemistry, IIQAB-CSIC, Jordi Girona 18-24, Barcelona 08034, Catalunya, ESPAGNE;

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正文语种英语
中图分类环境化学;
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Evidence for Dynamic Air-Water Coupling and Cycling of Persistent Organic Pollutants over the Open Atlantic Ocean

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