A Decade of Change in NO2 and SO2 over the Canadian Oil Sands As Seen from Space

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• 作者：Chris A. McLinden ; Vitali Fioletov ; Nickolay A. Krotkov ; Can Li ; K. Folkert Boersma ; Cristen Adams
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：January 5, 2016
• 年：2016
• 卷：50
• 期：1
• 页码：331-337
• 全文大小：470K
• ISSN：1520-5851

文摘

A decade (2005–2014) of observations from the Ozone Monitoring Instrument (OMI) were used to examine trends in nitrogen dioxide (NO₂) and sulfur dioxide (SO₂) over a large region of western Canada and the northern United States, with a focus on the Canadian oil sands. In the oil sands, primarily over an area of intensive surface mining, NO₂ tropospheric vertical column densities (VCDs) are seen to be increasing by as much as 10%/year, with the location of the largest trends in a newly developing NO₂ “lobe” well removed from surface monitoring stations. SO₂ VCDs in the oil sands have remained approximately constant. The only other significant increase in the region was seen in NO₂ over Bakken gas fields in North Dakota which showed increases of up to 5%/yr. By contrast, other locations in the region show substantial declines in both pollutants, providing strong evidence to the efficacy of environmental pollution control measures implemented by both nations. The OMI-derived trends were found to be consistent with those from the Canadian surface monitoring network, although in the case of SO₂, it was necessary to apply a correction in order to remove the residual signal from volcanic eruptions present in the OMI data.