Fate of persistent organic pollutants in the water column: does turbulent mixing matter?

The effect of vertical turbulent mixing on the dynamics of persistent organic pollutants has long been overlooked and its role is still hardly understood. Here we present the first comprehensive analysis of the role of turbulent diffusion on the distribution of those contaminants and its interplay with sinking fluxes. To this end, a 1D dynamic coupled hydrodynamic-contaminant model has been developed and applied to a Mediterranean continental shelf environment. The hydrodynamic sub-model is adapted from COHERENS, the contaminant sub-model is an improvement from the BIODEP model and considers the contaminant in 3 phases: dissolved-colloidal-particulate. The simulation highlights the role of turbulence in determining the POP distribution and variability in the water column. In short, turbulent flux of contaminants strengthens the upward diffusion of sediment entrained contaminants and determines the extent to which inputs from the atmosphere mix into the water column. It acts in parallel with degradation and sinking fluxes, the combined effect yielding a surface enriched - depth depleted - benthic layer enriched region distribution, which presents similarities to reported experimental measures.

[1]  Alain Norro,et al.  Application of COHERENS Model for Hydrodynamic Investigation of Sacca di Goro Coastal Lagoon (Italian Adriatic Sea Shore). , 2006 .

[2]  J. Duinker,et al.  Chlorobiphenyls (PCB) and PAHs in water masses of the northern North Atlantic , 1998 .

[3]  Kevin C Jones,et al.  Wet deposition of persistent organic pollutants to the global oceans. , 2005, Environmental science & technology.

[4]  Bruce E. Logan,et al.  Environmental Transport Processes , 1998 .

[5]  I. Cousins,et al.  Evaluation of sequentially-coupled POP fluxes estimated from simultaneous measurements in multiple compartments of an air-water-sediment system. , 2004, Environmental pollution.

[6]  Zaldivar Comenges Jose,et al.  Dynamic Modelling of the Fate of DDT in Lake Maggiore: Preliminary Results , 2005 .

[7]  R. Baker,et al.  Organic substances and sediments in water , 1900 .

[8]  P. Luyten,et al.  Exploring the thermal cycle of the Northern North Sea area using a 3-D circulation model: the example of PROVESS NNS station , 2002 .

[9]  J. Zaldívar,et al.  A 3D hydrodynamic fate and transport model for herbicides in Sacca di Goro coastal lagoon (Northern Adriatic). , 2006, Marine pollution bulletin.

[10]  J. Dachs,et al.  Oceanic deep water formation as a sink of persistent organic pollutants , 2006 .

[11]  R. Schwarzenbach,et al.  Environmental Organic Chemistry , 1993 .

[12]  B. Boudreau.  Diagenetic models and their implementation , 1997 .

[13]  J. Paasiv́irta,et al.  Degradation half-life times of PCDDs, PCDFs and PCBs for environmental fate modeling. , 2000, Chemosphere.

[14]  P. Larsson,et al.  Influence of trophic status on PCB distribution in lake sediments and biota. , 2001, Environmental Pollution.

[15]  E. Stephanou,et al.  Wet deposition of polychlorinated biphenyls in the eastern Mediterranean. , 2004, Environmental science & technology.

[16]  Wendy A. Ockenden,et al.  Oceanic biogeochemical controls on global dynamics of persistent organic pollutants. , 2002, Environmental science & technology.

[17]  D. Whittle,et al.  The relative importance of species invasions and sediment disturbance in regulating chemical dynamics in western Lake Erie , 2000 .

[18]  J. Villeneuve,et al.  Flux of transuranium nuclides and chlorinated hydrocarbons in the northwestern , 1990 .

[19]  Frank Wania,et al.  Peer reviewed: tracking the distribution of persistent organic pollutants. , 1996, Environmental science & technology.

[20]  M. Picer.  DDTs and PCBs in the Adriatic Sea , 2000 .

[21]  J. Albaigés,et al.  Monsoon-driven vertical fluxes of organic pollutants in the western Arabian Sea , 1999 .

[22]  Johanna J. Heymans,et al.  ECOTOX: Ecological Modelling and Ecotoxicology: Edited by L.A. Jørgensen, S.E. Jørgensen, S.N. Nielsen, Elsevier Science, Amsterdam, 2000. CD-ROM. ISBN 0-444-50240-8; NLG 1,200 or USD 609 , 2001 .

[23]  J. Baker,et al.  Coupling of phytoplankton uptake and air-water exchange of persistent organic pollutants , 1999 .

[24]  K. Hungerbühler,et al.  The effect of export to the deep sea on the long-range transport potential of persistent organic pollutants , 2004, Environmental science and pollution research international.

[25]  J. Baker,et al.  Internal recycling of particle reactive organic chemicals in the Chesapeake Bay water column , 2003 .

[26]  Des Connell,et al.  Octanol-water partition coefficients of polychlorinated biphenyl congeners , 1988 .

[27]  J. Duinker,et al.  Chlorinated biphenyls in North Atlantic surface and deep water , 1988 .

[28]  J. Albaigés,et al.  Spatial distribution, vertical profiles and budget of organochlorine compounds in Western Mediterranean seawater , 1997 .

[29]  O. Piringer,et al.  Henry's law constants for polychlorinated biphenyls: experimental determination and structure-property relationships , 1990 .

[30]  E. Stephanou,et al.  Study of atmospheric PCB concentrations over the eastern Mediterranean Sea , 2002 .

[31]  J. Dachs,et al.  Prediction of uptake dynamics of persistent organic pollutants by bacteria and phytoplankton , 2002, Environmental toxicology and chemistry.

[32]  Frank Wania,et al.  Estimating the contribution of degradation in air and deposition to the deep sea to the global loss of PCBs , 2002 .

[33]  J. W. Budd,et al.  The Effect of a Large Resuspension Event in Southern Lake Michigan on the Short-term Cycling of Organic Contaminants , 2002 .

[34]  J. Albaigés,et al.  Enrichment of organochlorine contaminants in the sea surface microlayer: An organic carbon-driven process , 2005 .

[35]  B. Halling‐Sørensen,et al.  Modelling the fate of dioxins in a trophic network by coupling an ecotoxicological and an Ecopath model , 2000 .

[36]  J. Baker,et al.  Sediment Trap Fluxes and Benthic Recycling of Organic Carbon, Polycyclic Aromatic Hydrocarbons, and Polychlorobiphenyl Congeners in Lake Superior , 1991 .

[37]  K. Jones,et al.  Persistent organic pollutants (POPs): state of the science. , 1999, Environmental pollution.

[38]  J. Albaigés,et al.  Spatial, vertical distribution and budget of polycyclic aromatic hydrocarbons in the western Mediterranean seawater , 1997 .

[39]  K. Jones,et al.  The maximum reservoir capacity of soils for persistent organic pollutants: implications for global cycling. , 2005, Environmental pollution.

[40]  P. Luyten,et al.  A numerical study of the long- and short-term temperature variability and thermal circulation in the North Sea , 2003 .

[41]  Jürgen Sündermann,et al.  A fate and transport ocean model for persistent organic pollutants and its application to the North Sea , 2006 .

[42]  M. Picer,et al.  Inflow, levels and the fate of some persistent chlorinated hydrocarbons in the Rijeka Bay area of the Adriatic Sea , 1992 .

[43]  J. Seinfeld,et al.  Atmospheric Chemistry and Physics: From Air Pollution to Climate Change , 1997 .

[44]  Konrad Hungerbühler,et al.  Investigation of the Cold Condensation of Persistent Organic Pollutants with a Global Multimedia Fate Model , 2000 .

[45]  L. Totten,et al.  Dynamic air-water exchange of polychlorinated biphenyls in the New York-New Jersey Harbor Estuary. , 2001, Environmental science & technology.

[46]  K. Buesseler,et al.  Settling Removal Rates of PCBs into the Northwestern Atlantic Derived from 238U−234Th Disequilibria , 1997 .

[47]  C. Duarte,et al.  Biomass distribution in marine planktonic communities , 1997 .

[48]  U. Larsson,et al.  Particle-water partitioning of PCBs in the photic zone: a 25-month study in the open Baltic Sea. , 2004, Environmental science & technology.

[49]  A. Watson,et al.  In situ evaluation of air‐sea gas exchange parameterizations using novel conservative and volatile tracers , 2000 .

[50]  R. Piazza,et al.  Determination of polychlorobiphenyl congeners (PCBs) in the surface water of the Venice lagoon. , 2005, Marine pollution bulletin.

[51]  Keri C. Hornbuckle,et al.  Magnitude and origin of polychlorinated biphenyl (PCB) and dichlorodiphenyltrichloroethane (DDT) compounds resuspended in southern Lake Michigan , 2004 .

[52]  D Mackay,et al.  TRAKING THE DISTRIBUTION OF PERSISTENT ORGANIC POLLUTANTS , 1996 .

[53]  J. Catalán,et al.  Modelling the dynamic air-water-sediment coupled fluxes and occurrence of polychlorinated biphenyls in a high altitude lake. , 2006, Environmental pollution.

[54]  Marco Zavatarelli,et al.  Climatological biogeochemical characteristics of the Adriatic Sea , 1998 .

[55]  J. Baldock,et al.  The biochemical and elemental compositions of marine plankton: A NMR perspective , 2002 .

[56]  C. Barbante,et al.  Determination of polychlorobiphenyls in Venice Lagoon sediments. , 2001, Chemosphere.

[57]  M. Pace,et al.  Why does the relationship between sinking flux and planktonic primary production differ between lakes and oceans , 1994 .

[58]  J. Villeneuve,et al.  PCBs in the western Mediterranean. Temporal trends and mass balance assessment , 1997 .

[59]  F. Gobas,et al.  Sediment-water distribution of organic contaminants in aquatic ecosystems: the role of organic carbon mineralization. , 2003, Environmental science & technology.

[60]  A. Marcomini,et al.  Estimation of PCDD/F distribution and fluxes in the Venice Lagoon, Italy: combining measurement and modelling approaches. , 2003, Chemosphere.

[61]  K. Jones,et al.  Atmospheric dry deposition of persistent organic pollutants to the Atlantic and inferences for the global oceans. , 2004, Environmental science & technology.