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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Similarity analysis of turbulent transport anddissipation for momentum, temperature, moisture,and COsub2/sub during BLLAST
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Similarity analysis of turbulent transport anddissipation for momentum, temperature, moisture,and COsub2/sub during BLLAST

机译：BLLAST过程中动量，温度，湿度和CO 2 的湍流输运与耗散相似性分析

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The budget equation components for turbulent kinetic energy (TKE) and the variances ofvirtual potential temperature, specific humidity, and specific CO2 content have been estimated usingthe Inertial Dissipation and Eddy Covariance methods. A discussion with four examples is providedabout the normalization used for comparing different tracer spectra, divided by the respective characteristicscale squared. A total of 124 high frequency sample segments of a 30-min period from20 days of the Boundary Layer Afternoon and Sunset Turbulence field campaign were used in orderto provide parameterizations for the dimensionless dissipation and residual (i.e. total transport)components as a function of the Atmospheric Surface Layer (ASL) stability parameter, ζ. The resultsshow a similar linear relation for all tracers variance dissipation components, ΦDχ ≅ 0.4 + 0.2 ζ,during the convective ASL, i.e. −1 < ζ < −0.1. Although parameterizations were also proposed forthe dimensionless dissipation rate of TKE and tracer variances during stable ASL, we conclude thatin this regime, other mechanisms in addition to ζ may be significantly important. In the stable andnear-neutral ASL stability regimes, the transport component for different tracers may not be consideredthe same. In these conditions, the dissipation component of TKE and tracer variances can havethe same magnitude as the other terms in their respective budget equation.
机译：利用惯性耗散和涡度协方差方法估算了湍流动能（TKE）和虚拟势能温度，比湿度和比CO 2 含量的方差的预算方程组。提供了有关四个示例的讨论，该示例用于比较不同的示踪谱，除以各自的特征比例平方。边界层下午和日落湍流场活动进行20天后的30分钟内，总共使用了124个高频样本段，以提供无因次耗散和残余（即总输运）分量随大气变化的参数化表面层（ASL）稳定性参数ζ。结果显示，在对流ASL期间，所有示踪剂方差耗散分量Φ D χ≅0.4 + 0.2ζ具有相似的线性关系。 1 <ζ<-0.1。尽管还针对稳定ASL期间TKE的无量纲耗散率和示踪剂方差提出了参数化方法，但我们得出的结论是，在这种情况下，除ζ以外的其他机制可能也非常重要。在稳定且接近中立的ASL稳定状态中，不同示踪剂的转运成分可能不相同。在这些条件下，TKE和跟踪方差的耗散分量可以与它们各自预算公式中的其他项具有相同的大小。

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