Two Column Models of Tropical Atmospheric Circulations

Raymond博士将使用高度简化的双柱模型来更好地理解大尺度热带环流，并帮助测试大气全球环流模型的积云参数化。 该模型涉及到使用两个嵌入式积云合奏，一个在每个列，耦合的质量流量往往会驱动两列的环境朝向浮力平衡彼此。 这些物质流是大尺度热带环流的两列模拟，其中一列代表步行者环流的上升（潮湿，对流）分支，另一列是下降（清晰，由辐射冷却驱动）分支。 因此，对流系综计算是在接近地球大气赤道地区实际发生的情况下进行的。 两列中的垂直速度是由模型本身产生的，而不是强加的。 积云集合可以用候选积云参数化代替，以便与集合模式计算进行比较。

Dr. Raymond will use a highly simplified two column model to better understand large-scale tropical circulations and to help test cumulus parameterizations for atmospheric global circulation models. The model involves the use of two embedded cumulus ensembles, one in each column, that are coupled by mass flows which tend to drive the two column's environments toward buoyancy equilibrium with each other. These mass flows are the two column analog of large scale tropical circulations where one column represents the ascending (moist, convective) branch of the Walker circulation and the other column is the descending (clear, driven by radiative cooling) branch. The convective ensemble calculations thus operate in a context that is close to that which actually occurs in the equatorial regions of the earth's atmosphere. Vertical velocities in the two columns are created by the model itself rather than being imposed. The cumulus ensembles can be replaced by candidate cumulus parameterizations for purposes of comparison with ensemble model calculations.