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Age spectra and other transport diagnostics in the North American monsoon UTLS from SEAC4RS in situ trace gas measurements
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2022
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Source: Atmospheric Chemistry and Physics, 22(10), 6539-6558
[PDF-13.94 MB]
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Journal Title:Atmospheric Chemistry and Physics
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Description:Abstract. The upper troposphere and lower stratosphere (UTLS) region during thesummer monsoon season over North America (NAM) is influenced by thetransport of air from a variety of source regions over a wide range of timescales (hours to years). Age spectra are useful for characterizing thetransport into such a region, and in this study we use and build on recentlydeveloped techniques to infer age spectra from trace gas measurements withphotochemical lifetimes from days to centuries. We show that themeasurements taken by the whole-air sampler instrument during theSEAC4RS campaign can be used to derive not only age spectra, but alsopath-integrated lifetimes of each of the trace gases and partitioningbetween North American and tropical surface source origins. The method usedhere can also clearly identify and adjust for measurement outliers that wereinfluenced by polluted surface source regions. The results are generallyconsistent with expected transport features of the NAM but also provide arange of transport diagnostics (age spectra, trace gas lifetimes and surfacesource regions) that have not previously been computed solely from in situmeasurements. These methods may be applied to many other existing in situdatasets, and the transport diagnostics can be compared withchemistry–climate model transport in the UTLS.
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Source:Atmospheric Chemistry and Physics, 22(10), 6539-6558
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ISSN:1680-7324
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Rights Information:CC BY
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Compliance:Submitted
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