The Zonally Averaged Transport Characteristics of the GFDL General Circulation/Transport Model
The Zonally Averaged Transport Characteristics of the GFDL General Circulation/Transport Model
复制标题
GFDL大气环流/运输模型的地带平均运输特性
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
J. Mahlman
中科院分区：
文献类型：
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作者：
R. A. Plumb;J. Mahlman
摘要GFDL大气环流/示踪剂模式已被用于生成二维（纬向平均）输运公式所需的输运系数。这是通过假设一个通量梯度关系，然后，从两个独立的（和人为的）模型示踪剂实验的梯度和通量的统计，推导出的系数，通过这种关系的反演。给定来自GCM的平均纬向环流，系数张量的反对称和对称部分决定了模式中对流和扩散对净纬向输送的贡献。这样定义的有效输送环流与拉格朗日平均环流和剩余环流有很大的不同，实际上它是模式环流的一种比这两种更简单的表示。扩散分量是相干结构的，包括以下分量：（i）中纬度对流层低层的强准水平混合（Dyy = 1 × 106 m2 s−1），显然与对流层低层的强准水平混合（Dyy = 1 × 106 m2 s−1）有关。
Abstract The GFDL general circulation/tracer model has been used to generate the transport coefficients required in two-dimensional (zonally averaged) transport formulations. This was done by assuming a flux-gradient relationship and then, given gradient and flux statistics from two independent (and contrived) model tracer experiments, to derive the coefficients by inversion of this relation. Given the mean meridional circulation from the GCM, the antisymmetric and symmetric parts of the coefficients tensor determine the advective and diffusive contributions to the net meridional transport in the model. The effective transport circulation thus defined differs substantially from the Lagrangian mean and residual circulations and is in fact a simpler representation of the model circulation than either of these. The diffusive component is coherently structured, comprising the following components: (i) Strong quasi-horizontal mixing (Dyy ∼ 1 × 106 m2 s−1) in the midlatitude lower troposphere, apparently associ...