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Volume 16, issue 4
Atmos. Chem. Phys., 16, 2207-2219, 2016
https://doi.org/10.5194/acp-16-2207-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 2207-2219, 2016
https://doi.org/10.5194/acp-16-2207-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 25 Feb 2016

Research article | 25 Feb 2016

Water vapour variability in the high-latitude upper troposphere – Part 2: Impact of volcanic eruptions

Christopher E. Sioris1, Jason Zou2, C. Thomas McElroy1, Chris D. Boone3, Patrick E. Sheese2, and Peter F. Bernath3,4 Christopher E. Sioris et al.
  • 1Department of Earth and Space Science and Engineering, York University, Toronto, Canada, 4700 Keele St., Toronto, ON, M3J 1P3, Canada
  • 2Department of Physics, University of Toronto, 60 St. George. St., Toronto, ON, M5S 1A7, Canada
  • 3Department of Chemistry, University of Waterloo, 200 University Ave. W, Waterloo, ON, N2L 3G1, Canada
  • 4Department of Chemistry & Biochemistry, Old Dominion University, 4541 Hampton Blvd., Norfolk, VA 23529, USA

Abstract. The impact of volcanic eruptions on water vapour in the high-latitude upper troposphere is studied using deseasonalized time series based on observations by the Atmospheric Chemistry Experiment (ACE) water vapour sensors, namely MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) and the Fourier Transform Spectrometer (ACE-FTS). The two eruptions with the greatest impact on the high-latitude upper troposphere during the time frame of this satellite-based remote sensing mission are chosen. The Puyehue–Cordón Caulle volcanic eruption in June 2011 was the most explosive in the past 24 years and is shown to be able to account for the observed (50±12)% increase in water vapour in the southern high-latitude upper troposphere in July 2011 after a minor adjustment for the simultaneous influence of the Antarctic oscillation. Eyjafjallajökull erupted in the spring of 2010, increasing water vapour in the upper troposphere at northern high latitudes significantly for a period of  ∼ 1 month. These findings imply that extratropical volcanic eruptions in windy environments can lead to significant perturbations to high-latitude upper tropospheric humidity mostly due to entrainment of lower tropospheric moisture by wind-blown plumes. The Puyehue–Cordón Caulle eruption must be taken into account to properly determine the magnitude of the trend in southern high-latitude upper tropospheric water vapour over the last decade.

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This paper shows that volcanic eruptions occurring at higher latitudes in windy environments can lead to significant perturbations to upper tropospheric (UT) humidity mostly due to entrainment of lower tropospheric moisture by wind-blown plumes. This research was performed for the purpose of determining long-term trends in high-latitude UT water vapour. The steps involve building a monthly climatology and using it to deseasonalize the time series. Large observed anomalies are then studied.
This paper shows that volcanic eruptions occurring at higher latitudes in windy environments can...
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