Observations of deep convective influence on stratospheric water vapor and its isotopic composition

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https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006GL027899

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https://doi.org/10.1029/2006GL027899
 http://hdl.handle.net/11603/18930

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UMBC Joint Center for Earth Systems Technology (JCET)

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2007-02-27

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journal articles
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Hanisco, T. F., et al. (2007), Observations of deep convective influence on stratospheric water vapor and its isotopic composition, Geophys. Res. Lett., 34, L04814,doi:10.1029/2006GL027899

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Abstract

In situ observations of H₂O and HDO in the midlatitude stratosphere are used to evaluate the role of convection in determining the stratospheric water budget. The observations show that water vapor in the overworld stratosphere (potential temperature > 380 K) is isotopically heavier than expected. Measurements in an airmass with anomalously high concentrations of water vapor show isotopic water signatures that are characteristic of evaporated ice lofted from the troposphere during convective storms. Observed H₂O and HDO concentrations in the plume of enhanced water and in the background stratosphere suggest that extratropical convection can account for a significant fraction of the observed water vapor in the summertime overworld stratosphere above the mid‐North American continent.