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Atmospheric chemistry and transportof mercury play a key role in the global mercury cycle. However, there arestill considerable knowledge gaps concerning the fate of mercury in theatmosphere. This is the second part of a model intercomparison studyinvestigating the impact of atmospheric chemistry and emissions on mercury inthe atmosphere. While the first study focused on ground-based observations ofmercury concentration and deposition, here we investigate the vertical andinterhemispheric distribution and speciation of mercury from the planetaryboundary layer to the lower stratosphere. So far, there have been few modelstudies investigating the vertical distribution of mercury, mostly focusingon single aircraft campaigns. Here, we present a first comprehensive analysisbased on various aircraft observations in Europe, North America, and onintercontinental flights.  The investigated models proved to be able to reproduce the distribution oftotal and elemental mercury concentrations in the troposphere includinginterhemispheric trends. One key aspect of the study is the investigationof mercury oxidation in the troposphere. We found that different chemistryschemes were better at reproducing observed oxidized mercury patternsdepending on altitude. High concentrations of oxidized mercury  in the uppertroposphere could be reproduced with oxidation by bromine while elevatedconcentrations in the lower troposphere were better reproduced by OH andozone chemistry. However, the results were not always conclusive as thephysical and chemical parameterizations in the chemistry transport modelsalso proved to have a substantial impact on model results

Multi-model study of mercury dispersion in the atmosphere: vertical and interhemispheric distribution of mercury species