Trans-Pacific transport of reactive nitrogen and ozone to Canada during spring

Walker, Thomas; Martin, Randall V.; Donkelaar, Aaron van; Leaitch, W. R.; Macdonald, A. M.; Anlauf, K. G.; Cohen, R. C.; Bertram, Timothy H.; Huey, L. G.; Avery, Melody; Weinheimer, A. J.; Flocke, Frank; Tarasick, D. W.; Thompson, A. M.; Streets, David G.; Liu, Xueliang

doi:10.5194/acp-10-8353-2010

Cited by 49 publications

(45 citation statements)

References 89 publications

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“…Once lifted, the ratio of NO / NO x will change leading to a reduction of NO 2 and a larger, unobserved reservoir of NO. Over the course of transport, NO 2 is partly converted into peroxyacyl nitrate (PAN) and other reservoir species, which may then release NO 2 upon descent, when concentrations of radical species, pressure and temperature increase (Singh and Hanst, 1981;Schultz et al, 1998;Walker et al, 2010). Both processes, direct long-range transport of NO x and transport of its reservoir species lead to an effective relocation of NO x emissions.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data

et al. 2014

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Abstract.Intercontinental long-range transport (LRT) events of NO 2 relocate the effects of air pollution from emission regions to remote, pristine regions. We detect transported plumes in tropospheric NO 2 columns measured by the GOME-2/MetOp-A instrument with a specialized algorithm and trace the plumes to their sources using the HYSPLIT Lagrangian transport model. With this algorithm we find 3808 LRT events over the ocean for the period 2007 to 2011. LRT events occur frequently in the mid-latitudes, emerging usually from coastal high-emission regions. In the free troposphere, plumes of NO 2 can travel for several days to the polar oceanic atmosphere or to other continents. They travel along characteristic routes and originate from both continuous anthropogenic emission and emission events such as bush fires. Most NO 2 LRT events occur during autumn and winter months, when meteorological conditions and emissions are most favorable. The evaluation of meteorological data shows that the observed NO 2 LRT is often linked to cyclones passing over an emission region.

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Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data

et al. 2014

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“…Background values may be overestimated for this year resulting in this negative O 3 (NA) and a lower background would result also in increased O 3 (tP). During the spring 2006 INTEX-B period (Leaitch et al, 2009;Walker et al, 2010) ozone Table 2. enhancements of about 10 ppbv were estimated in Asian air masses arriving at Whistler.…”

Section: Effect Of North American Boreal Firesmentioning

confidence: 99%

Interannual variability of ozone and carbon monoxide at the Whistler high elevation site: 2002–2006

et al. 2011

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“…He et al, 2011;Hocking et al, 2007) and the inter-continental transport of tropospheric ozone and its precursor species (Oltmans et al, 2006(Oltmans et al, , 2010. Canadian ozonesondes have also provided essential information on the nature of Arctic stratospheric ozone loss (Manney et al, 2011;Fioletov et al, 1997;Kerr et al, 1993), of Arctic surface depletion events Bottenheim et al, 2002), and of the global circulation of ozone (Lin et al, 2015;Bönisch et al, 2011;Pan et al, 2009), as well as of tropospheric sources and budgets (Emmons et al, 2015;Parrington et al, 2012;Walker et al, 2010Walker et al, , 2012Macdonald et al, 2011;Thompson et al, 2007;Tarasick et al, 2007). The time series of ozone soundings from Canadian stations comprise some of the longest records of vertical ozone profile measurement that exist, as well as the only time series of measurements in the free troposphere over Canada.…”

Section: Introductionmentioning

confidence: 99%

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

et al. 2016

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Abstract. In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in the 1970s at three other sites, and the network was expanded in stages to 10 sites by 2003. This important record for understanding long-term changes in tropospheric and stratospheric ozone has been re-evaluated as part of the SPARC/IO 3 C/IGACO-O 3 /NDACC (SI 2 N) initiative. The Brewer-Mast sonde, used in the Canadian network until 1980, is different in construction from the electrochemical concentration cell (ECC) sonde, and the ECC sonde itself has also undergone a variety of minor design changes over the period 1980-2013. Corrections have been made for the estimated effects of these changes to produce a more homogeneous data set.The effect of the corrections is generally modest. However, the overall result is entirely positive: the comparison with co-located total ozone spectrometers is improved, in terms of both bias and standard deviation, and trends in the bias have been reduced or eliminated. An uncertainty analysis (including the additional uncertainty from the corrections, where appropriate) has also been conducted, and the altitudedependent estimated uncertainty is included with each revised profile.The resulting time series show negative trends in the lower stratosphere of up to 5 % decade −1 for the period 1966-2013. Most of this decline occurred before 1997, and linear trends for the more recent period are generally not significant. The time series also show large variations from year to year. Some of these anomalies can be related to cold winters (in the Arctic stratosphere) or changes in the Brewer-Dobson circulation, which may thereby be influencing trends.In the troposphere, trends for the 48-year period are small and for the most part not significant. This suggests that ozone levels in the free troposphere over Canada have not changed significantly in nearly 50 years.

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Trans-Pacific transport of reactive nitrogen and ozone to Canada during spring

Abstract: Abstract. We interpret observations from the Intercontinen-

Cited by 49 publications

References 89 publications

Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data

Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data

Interannual variability of ozone and carbon monoxide at the Whistler high elevation site: 2002–2006

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

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Trans-Pacific transport of reactive nitrogen and ozone to Canada during spring

Abstract: Abstract. We interpret observations from the Intercontinen-

Cited by 49 publications

References 89 publications

Systematic analysis of tropospheric NO&lt;sub&gt;2&lt;/sub&gt; long-range transport events detected in GOME-2 satellite data

Systematic analysis of tropospheric NO&lt;sub&gt;2&lt;/sub&gt; long-range transport events detected in GOME-2 satellite data

Interannual variability of ozone and carbon monoxide at the Whistler high elevation site: 2002–2006

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

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Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data

Systematic analysis of tropospheric NO<sub>2</sub> long-range transport events detected in GOME-2 satellite data