(Table 1) Annual mean concentrations of atmospheric a- and g-Hexachlorocyclohexane at stations Alert, Canada and Zeppelin, Norway ...

• Main Authors: Becker, Sara, Halsall, Crispin J, Tych, Wlodek, Kallenborn, Roland, Su, Yushan, Hung, Hayley
• Format: Dataset
• Language: English
• Published: PANGAEA 2008
• Subjects: ipy; Event label; Latitude of event; Longitude of event; DATE/TIME; Sample amount; alpha-Hexachlorocyclohexane in air; Hexachlorocyclohexane, standard deviation; gamma-Hexachlorocyclohexane in air; Ratio; Observation; Air chemistry observatory; Joint Arctic Weather Stations; International Polar Year 2007-2008 IPY; International Polar Year; IPY; Nunavut; Svalbard
• Online Access: https://dx.doi.org/10.1594/pangaea.786649; https://doi.pangaea.de/10.1594/PANGAEA.786649

Twelve year datasets of weekly atmospheric concentrations of alpha- and gamma-HCH were compared between the two Arctic monitoring stations of Alert, Nunavut, Canada, and Zeppelin Mountain, Svalbard, Norway. Time-series analysis was conducted with the use of dynamic harmonic regression (DHR), which provided a very good model fit, to examine both the seasonal behaviour in these isomers and the longer-term, underlying trends. Strong spatial differences were not apparent between the two sites, although subtle differences in seasonal behaviour and composition were identified. For example, the composition of gamma-HCH to total HCH (alpha + gamma) was greater at Zeppelin compared to Alert, probably reflecting this site's proximity to major use regions of lindane. Pronounced seasonality in air concentrations for gamma-HCH was marked by a 'spring maximum event' (SME), confirming earlier studies. For alpha-HCH, the SME was much weaker and only evident at Alert, whereas at Zeppelin, seasonal fluctuations for alpha-HCH ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...