Snow Deposition and Melting as Drivers of Polychlorinated Biphenyls and Organochlorine Pesticides in Arctic Rivers, Lakes, and Ocean

被引:44
作者
Cabrerizo, Ana [1 ]
Muir, Derek C. G. [1 ]
Teixeira, Camilla [1 ]
Lamoureux, Scott F. [2 ]
Lafreniere, Melissa J. [2 ]
机构
[1] Environm & Climate Change Canada, Aquat Contaminant Res Div, Burlington, ON L7S 1A1, Canada
[2] Queens Univ, Dept Geog & Planning, Kingston, ON K7L 3N6, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
PERSISTENT ORGANIC POLLUTANTS; WATER GAS-EXCHANGE; GLOBAL CLIMATE-CHANGE; TEMPORAL TRENDS; ATMOSPHERIC CONCENTRATIONS; CANADIAN ARCHIPELAGO; MARINE ZOOPLANKTON; AIR EXCHANGE; PCBS; BIOACCUMULATION;
D O I
10.1021/acs.est.9b05150
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Concurrent sampling of freshwater (lakes and rivers), seawater, snow, air, and zooplankton for a range of legacy polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) was undertaken in the Canadian High Arctic during ice-covered, melting, and ice-free conditions. Overall, there was a general trend of higher fluvial PCB/OCP concentrations associated with the spring snow melt (early-mid June), while much lower concentrations were detected during the snow-free season (end of July). In contrast, PCB concentrations in two Arctic lakes (West and East Lakes, Melville Island) and in ocean waters, sharply increased in the ice-free period, likely because of inputs from the ice/snow layer melting and river runoff. The resulting air-water fugacity ratios and fluxes followed a remarkable shift during the sampling campaign. PCBs and OCPs shifted from equilibrium during ice/snow-covered conditions toward a clear net volatilization of PCBs and most of the OCPs during snow/ice-free conditions. Differences in the bioaccumulation factor for PCB/OCPs in zooplankton between West and East Lakes were observed, likely because of zooplankton being exposed to more contaminated food in West Lake due to higher turbidity related to in-lake disturbances.
引用
收藏
页码:14377 / 14386
页数:10
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