Effect of Extreme Weather Events on Contaminant Transport From Urban Run-Off to a Fjord System

Urbanization has resulted in increased contaminant run-off densely populated areas. Climate change is expected to result a higher frequency of extreme weather events including torrential rainfall and storms. The levels polycyclic aromatic hydrocarbons (PAH), chlorinated paraffins (CPF) selected metals, small urban river were monitored during snow-melting quantify the contribution contamination load receiving waters inner Oslo fjord, Norway. Suspended particulate matter (SPM) was characterized with respect contaminants as well toxic response using battery bioassays. flux from fjord quantified assessed relative sediment data. Historic data for near-shore samples used document input. results show clear episodic emitted fjord. main historic input found be PAH pyrogenic sources like coal wood burning traffic. A significant reduction level observed since 1980s. measured CPF consistent on-going societal use despite ban on short chain imposed Norway 2002.