A simple model for surface stress and low‐level flow in the tropical atmosphere driven by prescribed heating
A simple model for surface stress and low‐level flow in the tropical atmosphere driven by prescribed heating
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由指定加热驱动的热带大气中的表面应力和低层流动的简单模型
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Neelin
中科院分区：
文献类型：
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作者：
J. Neelin
本文建立了一个简单的热带边界层时均大尺度流模式，该模式在边界层顶部受垂直速度的强迫。该模型被制定为一个整体的边界层，并通过假设应力是成比例的边界层质量传输是封闭的。由于垂直速度与热带地区的非绝热加热密切相关，该模式也可以由降水测量的潜热加热来强迫。在这种情况下，该模型可以等效于广泛使用的松野-吉尔模型通过添加牛顿冷却项。这一项对气流的纬向非对称分量几乎没有影响，在没有这一项的情况下，边界层气流与上层气流是分离的。有人建议，低层流的吉尔模式的成功是由于这种有效的解耦。该模式是相当成功的模拟GCM结果的总气候和厄尔尼诺异常。第二个模型，它考虑到一些垂直结构的影响，在边界层，也提出了。在这些模型中，纬向对称分量的流动被证明是很差的再现。
A simple model is developed for time-mean, large-scale flow in the tropical boundary layer forced by vertical velocity at the top of the boundary layer. The model is formulated as an integral over the boundary layer and is closed by assuming the stress to be proportional to the boundary layer mass transport. Since vertical velocity is closely related to diabatic heating in the tropics, the model can also be forced by latent heating as measured by precipitation. In this case, the model can be made equivalent to the widely used Matsuno–Gill model by adding a Newtonian cooling term. This term can be shown to have little effect on the zonally asymmetric component of the flow and, in its absence, the boundary layer flow is decoupled from the flow at upper levels. It is suggested that the success of the Gill model for low-level flow is due to this effective decoupling. The model is quite successful at simulating GCM results for both the total climatology and El NiTo anomalies. A second model, which takes into account some effects of vertical structure in the boundary layer, is also presented. The zonally symmetric component of the flow is shown to be poorly reproduced in these models.