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. It is an open question how localized elevated emissions of bromoform (CHBr3) and other very short-lived halocarbons (VSLHs), found in coastal and upwelling regions, and low backgroundemissions, typically found over the open ocean, impact the atmosphericVSLH distribution. In this study, we use the Lagrangian dispersion modelFLEXPART to simulate atmospheric CHBr3 resulting from assumed uniform background emissions, and from elevated emissions consistent with those derived during three tropical cruise campaigns. The simulations demonstrate that the atmospheric CHBr3 distributions in the uniform background emissions scenario are highly variable with high mixing ratios appearing in regions of convergence or low wind speed. This relation holds on regional and global scales. The impact of localized elevated emissions on the atmospheric CHBr3distribution varies significantly from campaign to campaign. The estimatedimpact depends on the strength of the emissions and the meteorologicalconditions. In the open waters of the western Pacific and Indian oceans,localized elevated emissions only slightly increase the backgroundconcentrations of atmospheric CHBr3, even when 1∘ wide sourceregions along the cruise tracks are assumed. Near the coast, elevatedemissions, including hot spots up to 100 times larger than the uniformbackground emissions, can be strong enough to be distinguished from theatmospheric background. However, it is not necessarily the highest hot spotemission that produces the largest enhancement, since the tug-of-war between fast advective transport and local accumulation at the time of emission is also important. Our results demonstrate that transport variations in the atmosphere itselfare sufficient to produce highly variable VSLH distributions, and elevatedVSLHs in the atmosphere do not always reflect a strong localized source.Localized elevated emissions can be obliterated by the highly variableatmospheric background, even if they are orders of magnitude larger than the average open ocean emissions.

How marine emissions of bromoform impact the remote atmosphere