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  • Historic and current use pesticides (HUPs and CUPs), with respect to use in the United States and Canada, were identified in trans-Pacific and regional air masses at Mt. Bachelor Observatory (MBO), a remote high elevation mountain in Oregon’s Cascade Range located in the United States, during the sampling period of April 2004 to May 2006 (n=69), including NASA’s INTEX-B campaign (spring 2006). Elevated hexachlorobenzene (HCB) and α-hexachlorocyclohexane (α-HCH) concentrations were measured during trans-Pacific atmospheric transport events at MBO, suggesting that Asia is an important source region for these HUPs. Regional atmospheric transport events at MBO resulted in elevated dacthal, endosulfan, metribuzin, triallate, trifluralin, and chlorpyrifos concentrations, with episodic increases in concentration during some spring application periods, suggesting that the Western U.S. is a significant source region for these CUPs. Endosulfan I, γ-HCH, and dacthal concentrations were significantly positively correlated (p-value < 0.05) with increased air mass time in Western U.S. agricultural areas. Elevated γ-HCH concentrations were measured at MBO during both trans-Pacific and regional atmospheric transport events, including regional fire events. In addition to γ-HCH, elevated Σchlordane, α-HCH, HCB, and trifluralin concentrations were associated with fires in Western North America due to revolatilization of these pesticides from soils and vegetation. Trans-chlordane/cis-chlordane and α-HCH/γ-HCH ratios were calculated and may be used to distinguish between free tropospheric and regional and/or Asian air masses.
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  • description.provenance : Made available in DSpace on 2014-11-18T17:53:25Z (GMT). No. of bitstreams: 2 PrimbsTobyChemistryInfluenceAgriculturalAreas.pdf: 431291 bytes, checksum: aa7c368fa8dfa06ef22731443a955951 (MD5) PrimbsTobyChemistryInfluenceAgriculturalAreas_SupportingInformation.pdf: 569734 bytes, checksum: 276ca7bc148e997421ac9cf4e2901374 (MD5) Previous issue date: 2008-07-23
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-11-18T17:53:04Z No. of bitstreams: 2 PrimbsTobyChemistryInfluenceAgriculturalAreas.pdf: 431291 bytes, checksum: aa7c368fa8dfa06ef22731443a955951 (MD5) PrimbsTobyChemistryInfluenceAgriculturalAreas_SupportingInformation.pdf: 569734 bytes, checksum: 276ca7bc148e997421ac9cf4e2901374 (MD5)
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-11-18T17:53:25Z (GMT) No. of bitstreams: 2 PrimbsTobyChemistryInfluenceAgriculturalAreas.pdf: 431291 bytes, checksum: aa7c368fa8dfa06ef22731443a955951 (MD5) PrimbsTobyChemistryInfluenceAgriculturalAreas_SupportingInformation.pdf: 569734 bytes, checksum: 276ca7bc148e997421ac9cf4e2901374 (MD5)