On Turbulent Helicity in the Surface Layer of the Atmosphere

IF 0.9 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES Izvestiya Atmospheric and Oceanic Physics Pub Date : 2023-12-25 DOI:10.1134/s0001433823060117

O. A. Solenaya, E. A. Shishov, O. G. Chkhetiani, G. V. Azizyan, V. M. Koprov

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Abstract

Synchronous measurements of vorticity and velocity in the boundary layer of the atmosphere were carried out using the original three-component acoustic circulator developed at the Obukhov Institute of Physical Physics (IAP) in 2019–2020. The measurements were carried out in summer at the Tsimlyansk scientific station (in 2021 and 2022) at heights of 1.75 and 30 m. For different realizations, turbulent helicity has negative values on average, which is possibly due to the presence of local (breeze) winds. The spectra of turbulent helicity exhibit a slope close to –5/3, which corresponds to the transfer of helicity along the spectrum towards small scales (direct cascade). Spectrum slopes of –4/3 are also observed, as well as, in the low-frequency region, –1, associated with the convective component, wind shear, and submesoscale structures. The components of the turbulent vortex flow are calculated. The helicity values agree with the previously measured and theoretical estimates obtained for neutral conditions.

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论大气表层的湍流螺旋性

摘要2019-2020年，利用奥布霍夫物理研究所（IAP）开发的原始三分量声学循环器对大气边界层的涡度和速度进行了同步测量。在不同的实际情况下，湍流螺旋率平均为负值，这可能是由于当地（微风）风的存在。湍流螺旋度频谱的斜率接近-5/3，相当于螺旋度沿频谱向小尺度转移（直接级联）。此外，还观测到-4/3 的频谱斜率，以及在低频区域与对流成分、风切变和次中尺度结构相关的-1 的频谱斜率。计算了湍流涡流的成分。螺旋度值与之前在中性条件下测量和理论估算的结果一致。

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来源期刊

Izvestiya Atmospheric and Oceanic Physics 地学-海洋学

CiteScore

1.40

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Atmospheric and Oceanic Physics is a journal that publishes original scientific research and review articles on vital issues in the physics of the Earth’s atmosphere and hydrosphere and climate theory. The journal presents results of recent studies of physical processes in the atmosphere and ocean that control climate, weather, and their changes. These studies have possible practical applications. The journal also gives room to the discussion of results obtained in theoretical and experimental studies in various fields of oceanic and atmospheric physics, such as the dynamics of gas and water media, interaction of the atmosphere with the ocean and land surfaces, turbulence theory, heat balance and radiation processes, remote sensing and optics of both media, natural and man-induced climate changes, and the state of the atmosphere and ocean. The journal publishes papers on research techniques used in both media, current scientific information on domestic and foreign events in the physics of the atmosphere and ocean.