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A concept study: The sensitivity of stratospheric Bry to uncertainties in short lived substance emissions and atmospheric transport

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Citation:
Schofield, R. , Fueglistaler, S. , Wohltmann, I. and Rex, M. (2010): A concept study: The sensitivity of stratospheric Bry to uncertainties in short lived substance emissions and atmospheric transport , Ocean Circulation and Climate Dynamics Seminar, IFM-Geomar, Kielth October. .
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Abstract:

The transport processes across the tropical tropopause layer (TTL) combines slow advection with both microphysical and convective processes. The bromine budget of the stratosphere can not be reconciled with ground-based, balloon or satellite bromine monoxide (BrO) measurements using long-lived bromine containing substances alone. Much recent modeling work has invested the contribution of the very short-lived bromine substances bromoform (CHBr3) and combined with dibromomethane (CH2Br2) upon the stratospheric Bry budget. In this talk we examine these very short lived (VSL) as well as long-lived bromine species including their interaction of the water vapor transport processes through the TTL. Lagrangian back trajectories are initiated in the stratosphere and convection is parameterized using the ERA-Interim detrainment rates. We present the transport of the VSL bromine in a conceptualized form and investigate sensitivities to the general chemical, microphysical and convective processes that result in VSL bromine contributing to the total stratospheric bromine budget.

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