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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-405
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-405
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 May 2020

15 May 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Influence of convection on stratospheric water vapor in the North American Monsoon region

Wandi Yu1, Andrew Dessler1, Mijeong Park2, and Eric Jensen2 Wandi Yu et al.
  • 1Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA
  • 2National Center for Atmospheric Research, Boulder, Colorado, USA

Abstract. We quantify the connection between deep convection occurrence and summertime 100-hPa water vapor anomaly over the North America (NA) region and find substantial consistency of their interannual variations and that the water vapor mixing ratio over the NA region is up to ~ 1 ppmv higher when deep convection occurs. We use a Lagrangian trajectory model to demonstrate that the structure and the location of the NA anticyclone, as well as the tropical upper tropospheric temperature, determine how much contribution the deep convection could make to moistening the lower stratosphere. The deep convection mainly occurs over the Central Plains region, and most of the convectively moistened air is then transported to the center of the NA anticyclone and the anticyclonic structure helps maintain high water vapor content there. Our hypothesis explains both the summer seasonal cycle and interannual variability of the convective moistening efficiency in the NA region, and can provide valuable insight on modeling stratospheric water vapor.

Wandi Yu et al.

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Wandi Yu et al.

Wandi Yu et al.

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Short summary
The stratospheric water vapor mixing ratio over North America (NA) region is up to ~ 1 ppmv higher when deep convection occurs. We find substantial consistency in the inter-annual variations of NA water vapor anomaly and deep convection and explain both the summer seasonal cycle and inter-annual variability of the convective moistening efficiency. We show the NA anticyclone, and tropical upper tropospheric temperature, determine how much deep convection moistens the lower stratosphere.
The stratospheric water vapor mixing ratio over North America (NA) region is up to ~ 1 ppmv...
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