Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Volume 12, issue 9
Atmos. Chem. Phys., 12, 4033–4044, 2012
https://doi.org/10.5194/acp-12-4033-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 12, 4033–4044, 2012
https://doi.org/10.5194/acp-12-4033-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 May 2012

08 May 2012

Changing sources and environmental factors reduce the rates of decline of organochlorine pesticides in the Arctic atmosphere

S. Becker1, C. J. Halsall1, W. Tych1, R. Kallenborn2,3, M. Schlabach2, and S. Manø2 S. Becker et al.
  • 1Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
  • 2Norwegian Institute for Air Research (NILU), P.O. Box 100, 2007 Kjeller, Norway
  • 3The Norwegian University of Life Sciences (UMB), Department of Chemistry, Biotechnology and Food Scienc, P.O. Box 5003, 1432 Aas, Norway

Abstract. An extensive database of organochlorine (OC) pesticide concentrations measured at the Norwegian Arctic monitoring station at Ny-Ålesund, Svalbard, 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 p,p'-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 trans-chlordane/cis-chlordane (TC/CC) indicate a shift from primary sources, to more "weathered" secondary sources, whereas an increasing trend in o,p'-DDT/p,p'-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.

Publications Copernicus
Download
Citation