ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-9-515-2009 Changing sources and environmental factors reduce the rates of decline of organochlorine pesticides in the Arctic Atmosphere Becker S. 1 Halsall C. J. 1 Tych W. 1 Kallenborn R. 2 3 Schlabach M. 2 Manø S. 2 Lancaster Environment Centre, Lancaster University, Lancaster, UK Norwegian Institute for Air Research (NILU), Kjeller, Norway The University Centre in Svalbard (UNIS), Longyearbyen, Svalbard, Norway 08 01 2009 9 1 515 540 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/9/515/2009/acpd-9-515-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/9/515/2009/acpd-9-515-2009.pdf

An extensive database of organochlorine (OC) pesticide concentrations measured at the Norwegian Arctic Monitoring Station was analysed to assess longer-term trends in the Arctic atmosphere. Dynamic Harmonic Regression (DHR) is employed to investigate the seasonal and cyclical behaviour of chlordanes, DDTs and hexachlorobenzene (HCB), and to isolate underlying inter-annual trends. Although a simple comparison of annual mean concentrations (1994–2005) suggest a decline for all of the OCs investigated, the longer-term trends identified by DHR only show a significant decline for <i>p,p'</i>-DDT. Indeed, HCB shows an increase from 2003–2005. This is thought to be due to changes in source types and the presence of impurities in current use pesticides, together with retreating sea ice affecting air-water exchange. Changes in source types were revealed by using isomeric ratios for the chlordanes and DDTs. Declining trends in ratios of <i>trans-</i>chlordane/<i>cis-</i>chlordane (TC/CC) indicate a shift from primary sources, to more ''weathered'' secondary sources, whereas an increasing trend in <i>o,p'</i>-DDT/<i>p,p'</i>-DDT ratios indicate a shift from use of technical DDT to dicofol. Continued monitoring of these OC pesticides is required to fully understand the influence of a changing climate on the behaviour and environmental cycling of these chemicals in the Arctic as well as possible impacts from ''new'' sources.

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