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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >WISHE‐Moisture Mode in an Aquaplanet Simulation
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WISHE‐Moisture Mode in an Aquaplanet Simulation

机译：水上飞行器模拟中的WISHE水分模式

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摘要

This study aims to understand the nature of the tropical intraseasonal oscillations (ISOs) in an aquaplanet simulation performed using Geophysical Fluid Dynamics Laboratory's AM2.1 with a uniform sea surface temperature within the deep tropics. The simulated ISO resembles the observed Madden‐Julian Oscillation in that the spectral peak in precipitation appears at zonal wave number 1 and a period of ~60 days. Vertically integrated moist static energy budget of the simulated ISO shows that enhanced latent heat flux to the east of anomalously active convection causes eastward propagation of the ISO mode, which is weakly opposed by horizontal moisture advection. A series of mechanism denial experiments are conducted either by homogenizing select variables—surface wind stress, longwave radiative heating, and surface evaporation—with their zonal means from the control simulation or by suppressing free‐tropospheric moisture variation. Results of the mechanism denial experiments show that the simulated ISO disappears when the interactive surface evaporation is disabled, suggesting that the wind‐induced surface heat exchange (WISHE) mechanism is essential to the simulated ISO. Longwave cloud‐radiation feedbacks and moisture‐convection feedbacks affect horizontal scale and phase speed of the simulated ISO, respectively. Our results strongly suggest that the simulated ISO is the linear WISHE‐moisture mode of Fuchs and Raymond under horizontally uniform boundary conditions.
机译：这项研究的目的是通过使用地球物理流体动力学实验室的AM2.1在热带地区深海温度均匀的情况下进行的滑水板模拟来了解热带季节内振荡（ISO）的性质。模拟的ISO与观察到的Madden-Julian振荡相似，因为降水的光谱峰值出现在1号纬向波和约60天的周期内。模拟ISO的垂直积分湿静态能量收支表明，异常活跃对流以东的潜热通量增加，导致ISO模式向东传播，这与水平水分对流作用相对弱。通过将选择变量（表面风应力，长波辐射加热和表面蒸发）均等化，并采用控制模拟中的分区方法，或通过抑制自由对流层水分变化，进行了一系列机理否认实验。机理否认实验的结果表明，当禁用交互式表面蒸发时，模拟的ISO消失，这表明风诱导的表面热交换（WISHE）机制对于模拟的ISO是必不可少的。长波云辐射反馈和水分对流反馈分别影响模拟ISO的水平尺度和相速度。我们的结果强烈表明，模拟的ISO是水平均匀边界条件下Fuchs和Raymond的线性WISHE水分模式。

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