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It is a widely established fact that standard semi-Lagrangianadvection schemes are highly efficient numerical techniques for simulatingthe transport of atmospheric tracers. However, as they are not formally massconserving, it is essential to use some method for restoring massconservation in long time range forecasts. A common approach is to use globalmass fixers. This is the case of the semi-Lagrangian advection scheme in theIntegrated Forecasting System (IFS) model used by the Copernicus AtmosphereMonitoring Service (CAMS) at the European Centre for Medium-Range WeatherForecasts (ECMWF).  Mass fixers are algorithms with substantial differences in complexity andsophistication but in general of low computational cost. This paper shows thepositive impact mass fixers have on the inter-hemispheric gradient of totalatmospheric column-averaged CO<sub>2</sub> and CH<sub>4</sub>, a crucial feature oftheir spatial distribution. Two algorithms are compared: the simple"proportional" and the more complex Bermejo–Conde schemes. The former iswidely used by several Earth system climate models as well the CAMS globalforecasts and analysis of atmospheric composition, while the latter has beenrecently implemented in IFS. Comparisons against total column observationsdemonstrate that the proportional mass fixer is shown to be suitable for thelow-resolution simulations, but for the high-resolution simulations theBermejo–Conde scheme clearly gives better results. These results havepotential repercussions for climate Earth system models using proportionalmass fixers as their resolution increases. It also emphasises the importanceof benchmarking the tracer mass fixers with the inter-hemispheric gradient oflong-lived greenhouse gases using observations

geoscientific model development

Improving the inter-hemispheric gradient of total column atmospheric CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; in simulations with the ECMWF semi-Lagrangian atmospheric global model