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Seven years of stratospheric BrO observations from SCIAMACHY

Alexei Rozanov(1), Bjoern-Martin Sinnhuber(1), Heinrich Bovensmann(1) and John Burrows(1)

(1) University of Bremen, P.O. Box 33 04 40, D-28334 Bremen, Germany

Abstract

Bromine plays an important role in stratospheric ozone depletion. One important question is whether the stratospheric bromine loading is consistent with known sources of bromine, with the ultimate goal to be able to predict how the stratospheric bromine loading will change as a result of changes in emissions and under a changing climate.

The SCIAMACHY instruments launched on board ENVISAT in March 2002 provides now almost seven years of global stratospheric bromine monoxide (BrO) measurements. The vertically resolved stratospheric concentrations of BrO are obtained from the measurements of the scattered and reflected solar radiation performed by the SCIAMACHY instrument in the limb viewing geometry. The global coverage is achieved in 6 days.

Here we will present the seven year SCIAMACHY BrO data set in comparison to multi-year calculations from our stratospheric chemical transport model (CTM). In particular we will discuss the observations of BrO in the tropical lowermost stratosphere. SCIAMACHY BrO observations in the tropical tropopause region show clear signatures of deep convection with lowest BrO in actively convective regions. These observations will be compared with calculations from our chemical transport model and implications for the transport of very short-lived source gases into the stratosphere will be discussed.