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首页> 外文期刊>Atmospheric chemistry and physics >Improvement of vertical and residual velocities in pressure or hybrid sigma-pressure coordinates in analysis data in the stratosphere
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Improvement of vertical and residual velocities in pressure or hybrid sigma-pressure coordinates in analysis data in the stratosphere

机译：改进平流层分析数据中压力或混合sigma-压力坐标的垂直速度和残余速度

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摘要

Stratospheric vertical winds from analysis datain pressure (p) or hybrid pressure (σ-p) coordinates,for use in e.g. chemical transport models(CTMs) or trajectory models,often suffer both from excessivenoise and errors in their mean magnitude, which in turncan introduce errors in important dynamical quantities like vertical mixingor constituent transport with the residual circulation. Sincevertical velocities cannot be measured directly, they areinferred from other quantities, typically from horizontal wind divergence,that is the mass continuity equation.We propose a method to calculate the vertical wind field from thethermodynamic energy equation in p or σ-p vertical coordinatesthat substantially reduces noise andoverestimation of the residual circulation. It is completelyequivalent to the approach using potential temperature (θ) as a verticalcoordinate and diabatic heating rates as vertical velocities, which hasalready been demonstrated to give superior results to the continuity equation.It provides a quickly realizable improvement of the vertical winds,when a change of the vertical variable would cause an inadequate effort(e.g. in CTMs).The method is only applicable for stably stratified regions likethe stratosphere.
机译：根据压力（ p ）或混合压力（σ- p ）坐标中的分析数据得出的平流层垂直风，例如用于化学传递模型（CTM）或轨迹模型通常同时遭受过多的噪声和平均幅度误差的影响，这反过来又会引入重要的动态量误差，例如带有残留循环的垂直混合器或成分传递。由于不能直接测量垂直速度，因此可以从其他量（通常是水平风散度）推导得出，也就是质量连续性方程。我们提出了一种根据 p 或热力学能量方程计算垂直风场的方法σ- p 垂直坐标，可显着减少噪声和对剩余循环的高估。它完全等效于使用势能温度（θ）作为垂直坐标，而将非绝热加热速率作为垂直速度的方法，这已经被证明可以为连续性方程提供更好的结果。当变化时，可以快速实现对垂直风的改进。垂直变量的设置会导致工作量不足（例如，在CTM中）。该方法仅适用于平流层等稳定分层的区域。

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