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Observations of deep convective influence on stratospheric water vapor and its isotopic composition
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, USA
Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, USA
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
NASA Ames Research Center, Mountain View, California, USA
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.
Received 16 August 2006; accepted 23 January 2007; published 27 February 2007.
Citation: (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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