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Bromoform (CHBr3) is a short-lived species with an important but poorlyquantified ocean source. It can be transported to the Tropical TropopauseLayer (TTL), in part by rapid, deep convective lifting, from where it caninfluence the global stratospheric ozone budget. In a modelling study, weinvestigate the importance of the regional distribution of the emissions andof model resolution for the transport of bromoform to the TTL. We use twoidealized CHBr3 emission fields (one coastal, one uniformly distributedacross the oceans) implemented in high- and coarse-resolution (HR and CR)versions of the same global model and focus on February as the period ofpeak convection in the West Pacific. Using outgoing long-wave radiation andprecipitation as metrics, the HR version of the model is found to representconvection better. In the more realistic HR model version, the coastalemission scenario leads to 15–20 % more CHBr3 in the global TTL, andup to three times more CHBr3 in the TTL over the Maritime Continent,than when uniform emissions of the same tropical magnitude are employed.Using the uniform emission scenario in both model versions, the distributionof CHBr3 at 15.7 km (approximately the level of zero net radiativeheating) is qualitatively consistent with the differing geographicdistributions of convection. However, averaged over the whole tropics, theamount of CHBr3 in the TTL in the two model versions is similar. Usingthe coastal scenario, in which emissions are particularly high in theMaritime Continent because of its long coastlines, the mixing ratio ofCHBr3 in the TTL is enhanced over the Maritime Continent in both modelversions. The enhancement is larger, and the peak in CHBr3 mixing ratiooccurs at a higher altitude, in the HR model version. Our regional-scaleresults indicate that using aircraft measurements and coarse global modelsto infer CHBr3 emissions will be very difficult, particularly if (as ispossible) emissions are distributed heterogeneously and in regions of strongconvective activity. In contrast, the global-scale agreement between our CRand HR calculations suggests model resolution is less vital for studiesfocused on the transport of bromine into the global stratosphere

On the emissions and transport of bromoform: sensitivity to model resolution and emission location