On the Two-Dimensional Transport of Stratospheric Trace Gases in Isentropic Coordinates
On the Two-Dimensional Transport of Stratospheric Trace Gases in Isentropic Coordinates
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平流层痕量气体在等熵坐标下的二维输运
DOI：
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发表时间：
1982
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通讯作者：
K. Tung
中科院分区：
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作者：
K. Tung
本文建立了等熵坐标系下平流层示踪剂输送的纬向平均模式。用位温代替气压作为垂直坐标系，既有概念上和计算上的优点，也有缺点。主要缺点是等熵坐标系中的“密度”（单位坐标体积的质量）不再像在流体静力学近似下的压力坐标系中那样是常数。然而，在平均非绝热环流和涡动平流输送的计算中，这种密度效应几乎可以忽略。通过采用新的公式得到的是一个概念上更简单的图片的相互作用的非绝热和绝热过程中的示踪剂的运输。平均非绝热加热（冷却）迫使平均质量流直接上升（下降）。沿着这个平均质量环流的流线，示踪物在平均中平流。这些表面向下倾斜，并在极...
Abstract A zonally averaged model of stratospheric tracer transport is formulated in isentropic coordinated There are some conceptual and computational advantages, as well as some disadvantages in adopting the potential temperature, instead of pressure, as the vertical coordinate. The main disadvantage is that the “density” (mass per unit coordinate volume) in isentropic coordinates is no longer a constant as in the pressure coordinate system under the hydrostatic approximation. However, it can be shown that this density effect is almost negligible in the calculation of the mean diabatic circulation and the eddy advective transports. What is gained by adopting the new formulation is a conceptually simpler picture of the interplay of diabatic and adiabatic process in the transport of tracers. Mean diabatic heating (cooling) forces a direct rising (descending) mean mass flow. Along the streamlines of this mean mass circulation, tracers are advected in the mean. These surfaces slope downward and poleward in ...