Climatic
Influence on Temporal Trends of Polychlorinated
Biphenyls and Organochlorine Pesticides in Landlocked Char from Lakes
in the Canadian High Arctic
Posted on 2018-07-18 - 19:14
Temporal
trends and climate related parameters affecting the fate
of legacy persistent organic pollutants (POPs) such as polychlorinated
biphenyls (PCBs) and organochlorine pesticides (OCPs) were examined
in landlocked Arctic char from four lakes in the Canadian Arctic.
Among biological parameters, lipid content was a key factor explaining
the concentration of most POPs in Arctic char. Legacy PCBs and OCPs
generally showed declining trends of concentrations in Arctic char,
consistent with past restriction on uses and emissions of POPs. However,
increases in lake primary productivity (measured as chlorophyll a)
exerted a dilution effect on POPs concentrations in Arctic char. Concentrations
of POPs in char from the last two decades were positively correlated
with interannual variations of the North Atlantic Oscillation (NAO).
Higher concentrations of POPs in Arctic char were observed in 3 of
the 4 lakes during positive NAO phases. This, together with increasing
local Arctic temperatures, could lead to increases on POPs concentrations
in char from remote Arctic Lakes in future decades. Also, if there
are nearby secondary sources as may be the case for Resolute Lake,
located near an airport where increasing levels were found for hexachlorobenzene
and toxaphene, probably due to the mobilization from secondary sources
in soils.
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Cabrerizo, Ana; C. G. Muir, Derek; Köck, Günter; Iqaluk, Deborah; Wang, Xiaowa (2018). Climatic
Influence on Temporal Trends of Polychlorinated
Biphenyls and Organochlorine Pesticides in Landlocked Char from Lakes
in the Canadian High Arctic. ACS Publications. Collection. https://doi.org/10.1021/acs.est.8b01860
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AUTHORS (5)
AC
Ana Cabrerizo
DC
Derek C. G. Muir
GK
Günter Köck
DI
Deborah Iqaluk
XW
Xiaowa Wang