4 record(s) found for principle investigator "Gregor, Dennis" (multi-year projects are grouped):
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Current contaminant deposition measurements in precipitation throughout the NWT
Principal Investigator: Gregor, Dennis J.
Licenced Year(s): 1993
Summary: Contaminants are carried in the air to the arctic during the winter when large-scale wind movements bring these contaminants from industrialized locations in North America, Europe and Asia to the north. Snow can collect these compounds from the air and bring them to the ground where they can accumulate. Thus, it is important to study the amount of contaminants in snow to determine the types and ...


Processes and Fluxes of Contaminants in Aquatic Systems
Principal Investigator: Gregor, Dennis J.
Licenced Year(s): 1993
Summary: Atmospheric contaminants that accumulate in the snow are released during a very short time in the spring when the snow melts and washes out through rivers and lakes into the Arctic Ocean. Contaminants can be bound to substrates, consumed by organisms or transformed so that not all contaminants deposited in the snow reach the Arctic Ocean. In this on-going study, contaminant levels and distributi...


The Historical Record of Persistent Organic Pollutants and Trace Metals in Glacial Snow and Ice
Principal Investigator: Gregor, Dennis J.
Licenced Year(s): 1994 1993
Summary: Ice caps have been used to measure changes in the chemistry of the atmosphere over long periods of time. The studies have addressed climate change, levels of pollutants resulting from human activities, and levels of materials put into the atmosphere by natural processes (e.g., volcano eruptions). This on-going study has been examining the levels of contaminants in ice caps since 1986 by collecti...


Deposition and Fate of Trace Organic Contaminants in Arctic Aquatic Systems
Principal Investigator: Gregor, Dennis J.
Licenced Year(s): 1992 1991 1991 1990
Summary: Snow samples will be collected from very remote sites throughout the mainland of NWT during visits to stations maintained by Water Resources Branch. Samples will also be collected at several high Arctic weather stations. Intensive sampling will also be conducted on Agassiz Ice Cap near Resolute. Samples will be analyzed for pesticides, PCBs and other compounds....


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