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T Bayr and D Dommenget [J. Climate 26 (2013) 1387] proposed a model oftemperature-driven air redistribution to quantify the ratio between changes ofsea level pressure $p_s$ and mean tropospheric temperature $T_a$ in thetropics. This model assumes that the height of the tropical troposphere isisobaric. Here problems with this model are identified. A revised relationshipbetween $p_s$ and $T_a$ is derived governed by two parameters -- the isobaricand isothermal heights -- rather than just one. Further insight is provided bythe model of R S Lindzen and S Nigam [J. Atmos. Sci. 44 (1987) 2418], which wasthe first to use the concept of isobaric height to relate tropical $p_s$ to airtemperature, and did this by assuming that isobaric height is always around 3km and isothermal height is likewise near constant. Observational data,presented here, show that neither of these heights is spatially universal nordo their mean values match previous assumptions. Analyses show that the ratioof the long-term changes in $p_s$ and $T_a$ associated with land-seatemperature contrasts in a warming climate -- the focus of Bayr and Dommenget[2013] -- is in fact determined by the corresponding ratio of spatialdifferences in the annual mean $p_s$ and $T_a$. The latter ratio, reflectinglower pressure at higher temperature in the tropics, is dominated by meridionalpressure and temperature differences rather than by land-sea contrasts.Considerations of isobaric heights are shown to be unable to predict eitherspatial or temporal variation in $p_s$. As noted by Bayr and Dommenget [2013],the role of moisture dynamics in generating sea level pressure variationremains in need of further theoretical investigations.

Comment on "The Tropospheric Land-Sea Warming Contrast as the Driver of Tropical Sea Level Pressure Changes" by Bayr and Dommenget