материалы конференции

En

Advances in Science, Technology and Innovation

ISSN:25228714

2025

Repina, I.¹

10.1007/978-3-031-86777-4_17

The air-sea interaction processes depend to a large extent on the intensity and structure of turbulence in the adjacent boundary layers. We analyze data from synchronous in-situ observations both in the near-surface sea layers and in the atmosphere, conducted in the coastal zone of the Black Sea. Turbulent characteristics in water and air, as well as background hydrometeorological parameters, were measured. From the observations, different-scale quasi-periodic structures in both media were identified, and the scales of the main energy-carrying eddies were determined. The recognized structures in air and water have both common features and differences in the periods and intensity of the detected oscillations. Under strong upwelling conditions, a well-defined period of intensity in air friction velocity and sea turbulence intensity was observed, with durations ranging from 2 to 42–44 h (~0.3 km–15 km). The maximum periods in the intensity of atmospheric and sea turbulence reached 72 h. The most frequent periods of fluctuations in turbulence intensity were about 1, 3, and 6 h. Depending on the scale and intensity of the atmospheric processes, the time of the marine environment's reaction to the dynamic forcing in the observed cases varied from 1 h to ~10 h. The energy spectra of atmospheric turbulence show the presence of coherent structures, with the energy-bearing part of the spectrum decreasing in some cases according to the law −8/3. The coherent structures contain both large-scale and small-scale turbulence, so the turbulence spectra have a complex shape, and the different slopes in different parts of the spectrum indicate different energy transfer processes along the spectrum. In marine turbulence, the spectra also contain both coherent regions with a slope of −8/3 and bands obeying the law of −5/3, in accordance with the Kolmogorov-Obukhov theory, although the presence of structures can be seen in the vast majority of experiments using wavelet analysis. The results obtained prove the important role of relatively large-scale structures in the conjugate layers of the sea and atmosphere and the necessity of a joint study of processes in these layers. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

Air-sea interaction; Coastal zone; Conjugates layers; Field measurements; Turbulent structures

2-s2.0-105028251407

Chukharev, A., Repina, I. (2025). Similarity and Differences of Turbulent Structures in the Sea and Atmosphere Conjugates Layers. In: Zhang, Z., et al. Dynamic Evolution of Atmospheric, Ecological, and Hydrological Systems in Circum-Mediterranean Regions. MedGU 2023. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-031-86777-4_17