While the numerical models are being run with increasing resolutions, the parameterization of cumulus convection used in the general circulation models, irrespective of closure assumption and trigger mechanism, continue to use the mass flux framework. To address one of the most important components of convective parameterization, vertical profile of mass flux is examined. We have compared the convective mass flux of the Coupled Model Intercomparison Project Phase 5 (CMIP5) models during Boreal summer over the Eastern Pacific, Western Pacific and Indian Ocean with that of ERA – Year of Tropical Convection (YOTC) reanalysis dataset. The analyses suggest that most of the models overestimate the mass flux by an order over all the oceanic basins and interestingly the vertical structure also appears similar for all the CMIP5 models irrespective of ocean basins. In view of this, we state that the improper mass flux distribution in the cumulus parameterization schemes of global models need to be improved to reduce some of the uncertainties arising from the cumulus schemes of climate models which in turn impact the precipitation bias of the models.

当数值模型以越来越高的分辨率运行时，在一般环流模型中使用的积云对流参数化，无论是否采用封闭假设和触发机制，都将继续使用质量通量框架。为了解决对流参数化的最重要组成部分之一，研究了质量通量的垂直分布。我们比较了北太平洋夏季，东太平洋，西太平洋和印度洋的耦合模型互比较项目阶段5（CMIP5）模型的对流质量通量与ERA –热带对流年（YOTC）重新分析数据集的对流质量通量。分析表明，大多数模型高估了所有洋盆的质量通量，有趣的是，所有CMIP5模型的垂直结构也似乎相似，而与洋盆无关。有鉴于此，我们指出，需要改进全局模型的积云参数化方案中不适当的质量通量分布，以减少气候模型的积云方案所产生的一些不确定性，这些不确定性进而影响模型的降水偏差。