Advective-diffusive mass flux and implications for stratosphere-troposphere exchange
Advective-diffusive mass flux and implications for stratosphere-troposphere exchange
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DOI：
10.1029/2002gl016419
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发表时间：
2003-03-07
影响因子：
5.2
通讯作者：
Holzer, M
中科院分区：
文献类型：
--
作者：
Hall, TM;Holzer, M
我们证明了质量在一个方向上穿过任何指定表面S的通量（“总”通量），该表面S在一个封闭区域内划分了一个对向扩散流。也就是说，流体质量通过S的通量F （tau）在S的一侧花费了至少一段时间，在连续体极限中像tau（-1/2）一样发散为tau -> 0。总通量完全由在S的一边极短时间停留的流体要素所控制，然后再穿越到另一边。这一一般性结果将对中纬度对流层顶的总质量通量的广泛不同的估计纳入了背景。这样的估计以最小的分辨尺度为主，使我们得出结论，总质量通量不是对平流层-对流层交换的有用诊断。然而，函数F （tau）提供了穿越对流层顶的重要信息。
[1] We show that the flux of mass crossing in one direction (the "gross'' flux) through any specified surface S that divides anadvective-diffusive flow in a closed domain is infinite. That is, the flux, F (tau), through S of the fluid mass that spent at least time tau on one side of S diverges like tau(-1/2) as tau --> 0, in the continuum limit. The gross flux is completely dominated by fluid elements residing infinitesimally short times on one side of S before re-crossing to the other side. This general result puts into context the widely varying estimates of gross mass flux across the midlatitude tropopause. Such estimates are dominated by the smallest resolved scales, leading us to conclude that gross mass flux is not a useful diagnostic of stratosphere-troposphere exchange. The function F (tau), however, provides important information on transport across the tropopause.