Role of deep convection in establishing the isotopic composition of water vapor in the tropical transition layer

Details Role of deep convection in establishing the isotopic composition of water vapor in the tropical transition layer Role of deep convection in establishing the isotopic composition of water vapor in the tropical transition layer

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306812s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 6, CiteID L06812

Physics

16

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry

Scientific paper

The transport of H2O and HDO within deep convection is investigated with 3-D large eddy simulations (LES) using bin microphysics. The lofting and sublimation of HDO-rich ice invalidate the Rayleigh fractionation model of isotopologue distribution within deep convection. Bootstrapping the correlation of the ratio of HDO to H2O (δD) to water vapor mixing ratio (qv) through a sequence of convective events produces non-Rayleigh correlations resembling observations. These results support two mechanisms for stratospheric entry. Deep convection can inject air with water vapor of stratospheric character directly into the tropical transition layer (TTL). Alternatively, moister air detraining from convection may be dehydrated via cirrus formation in the TTL to produce stratospheric water vapor. Significant production of subsaturated air in the TTL via convective dehydration is not observed in these simulations, nor is it necessary to resolve the stratospheric isotope paradox.

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