Robie W. Macdonald

TL;DR: In this paper, parent and alkyl PAHs were quantified in suspended particulates and sediments (345 samples) from the Fraser River system, British Columbia, Canada, and the best potential to distinguish natural and anthropogenic sources is exhibited by ratios of the principal mass 178, 202, 228 and 276 parent PAH, 1,7/2,6+1,7-DMP (dimethylphenanthrene), the phenanthrene/anthracene and fluoranthene/pyrene alkyal PAH series and several less commonly applied PA

TL;DR: In this article, a comprehensive review of the status of the contemporary carbon cycle of the Arctic and its response to climate change is presented to clarify key uncertainties and vulnerabilities in the response of the carbon cycle in the Arctic to ongoing climatic change.

TL;DR: In this article, the authors discuss the role of organic carbon in primary and secondary production in the Arctic Ocean and its role in sea ice formation and its effect on sea ice degradation.

TL;DR: The Arctic has undergone dramatic change during the past decade, and the observed changes include atmospheric sea-level pressure, wind fields, sea-ice drift, ice cover, length of melt season, change in precipitation patterns,change in hydrology and change in ocean currents and watermass distribution.

TL;DR: New knowledge developed under the NCP on the sources, occurrence and pathways of contaminants (organochlorines, Hg, Pb and Cd, PAHs, artificial radionuclides) are highlighted and compelling evidence for close connectivity between the global emission of contaminants from industrial and agricultural activities and the Arctic is provided.