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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Characteristics of the marine boundary layers during two Lagrangian measurement periods 2. Turbulence structure
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Characteristics of the marine boundary layers during two Lagrangian measurement periods 2. Turbulence structure

机译：两个拉格朗日测量期间海洋边界层的特征2.湍流结构

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摘要

Characteristics of turbulence mixing in remote marine boundary layers are analyzed using aircraft measurements from six flights during the two intensive Lagrangian measurement periods of ACE1 (the southern hemisphere Aerosol Characterization Experiment). The six cases studied here represent a variety of boundary layer conditions in the region south of Tasmania, Australia. Our study indicated that (1) Lagrangian A (LA) had stronger turbulence mixing and entrainment compared to Lagrangian B (LB) due to greater shear generation of turbulence kinetic energy (TKE), (2) strong mesoscale variation boundary layer turbulence and thus and thus turbulence mixing existed in the ACE1 region during LB due to variations in sea surface temperature (SST), (3) stable thermal stratification in the boundary layer was found during the last flight of each Lagrangian, consequently, TKE decreased rapidly with height resulting in small or near-zero entrainment rate in spite of strong shear forcing at the surface and in the boundary layer; and (4) the buffer layer, which lies above the boundary layer and below the main inversion, had weak and intermittent turbulence mostly associated with cloud bands and cumulus. Evidence of entrainment was found in the buffer layer. However, it is difficult to quantify by flux measurements due to the weak and intermittent nature of the turbulence field.
机译：在ACE1的两个拉格朗日密集测量期（南半球气溶胶表征实验）期间，通过六次飞行中的飞机测量，对偏远海洋边界层的湍流混合特性进行了分析。这里研究的六个案例代表了澳大利亚塔斯马尼亚州以南地区的各种边界层条件。我们的研究表明：（1）拉格朗日A（LA）与拉格朗日B（LB）相比，湍流混合和夹带更强，这是由于湍流动能（TKE）产生的剪切力更大;（2）中尺度变化边界层湍流强，因此和因此，由于海表温度（SST）的变化，LB在ACE1区域内存在湍流混合。（3）在每个拉格朗日河的最后一次飞行期间在边界层中发现了稳定的热分层，因此TKE随着高度的增加而迅速下降。尽管在表面和边界层上有很强的剪切力，但夹带率仍然很小或接近零; （4）位于边界层上方和主反演下方的缓冲层具有弱而间歇的湍流，主要与云带和积云有关。在缓冲层中发现夹带的证据。但是，由于湍流场的弱性和间歇性，很难通过通量测量来量化。

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