Convection in the east Pacific Intertropical Convergence Zone
Convection in the east Pacific Intertropical Convergence Zone
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东太平洋热带辐合带的对流
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
D. Raymond
中科院分区：
文献类型：
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作者：
D. Raymond
热带太平洋东部表现出强烈的跨赤道海面温度（SST）梯度，驱动大气边界层出现南风流。通常认为该气流的辐合驱动了东太平洋热带辐合带的深层对流。然而，云建模和最近的现场项目的结果提供了控制这种对流的替代热力学机制。浅层对流响应边界层收敛，而深层对流似乎受到对流抑制、表面湿熵通量、对流层相对湿度和湿对流不稳定性的综合控制。这些因素解释了红外亮度温度在 8°N 附近出现急剧最小值的原因，而边界层会聚发生在更广泛的纬度范围内。
The eastern tropical Pacific exhibits a strong, cross‐equatorial sea surface temperature (SST) gradient, which drives a southerly flow in the atmospheric boundary layer. Convergence in this flow is generally considered to drive deep convection in the east Pacific Intertropical Convergence Zone. However, results from cloud modeling and recent field programs provide an alternative thermodynamic mechanism for controlling this convection. While shallow convection responds to boundary layer convergence, deep convection appears to be controlled by a combination of convective inhibition, surface moist entropy fluxes, tropospheric relative humidity, and moist convective instability. These factors explain the sharp minimum in infrared brightness temperature near 8°N while boundary layer convergence occurs over a much broader range of latitudes.