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<p>An analysis of multi-month in situ observations of sea level fluctuations off the southeastern coast of Sakhalin Island revealed an unusual structure in the phase spectrum of short-period waves with periods of 10–70&#xa0;s. This characteristic feature manifests itself as a persistent cyclical change in the relative phase between two observation points when instruments are located along a line perpendicular to the coastline. A study of data obtained in different years and in three coastal areas with different bathymetry revealed that the phenomenon is associated with depth characteristics, bottom slope, and the possible influence of local currents. Physical mechanisms capable of causing the observed behavior of the phase spectrum are considered, including the impact of ambient currents on the relative wave frequency and changes in phase speed due to variations horizontally and in time of the water depth. Both mechanisms can explain the inclined strips in the phase diagrams, but do not by themselves cause their cyclical nature. Analysis of long-period sea level and atmospheric pressure spectra revealed the presence of a wave process with a period of approximately 26&#xa0;days, interpreted as a manifestation of atmospheric-ocean Rossby waves. It is hypothesized that slow current variations induced by planetary waves modulate the phase characteristics of short-period waves and cause the observed cyclicity. The results obtained indicate a potential connection between the phase characteristics of short-period waves and large-scale dynamic processes in the coastal zone.</p>

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Impact of Rossby ocean waves on short-period sea surface waves

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Dmitry P. Kovalev,
  • Peter D. Kovalev

摘要

An analysis of multi-month in situ observations of sea level fluctuations off the southeastern coast of Sakhalin Island revealed an unusual structure in the phase spectrum of short-period waves with periods of 10–70 s. This characteristic feature manifests itself as a persistent cyclical change in the relative phase between two observation points when instruments are located along a line perpendicular to the coastline. A study of data obtained in different years and in three coastal areas with different bathymetry revealed that the phenomenon is associated with depth characteristics, bottom slope, and the possible influence of local currents. Physical mechanisms capable of causing the observed behavior of the phase spectrum are considered, including the impact of ambient currents on the relative wave frequency and changes in phase speed due to variations horizontally and in time of the water depth. Both mechanisms can explain the inclined strips in the phase diagrams, but do not by themselves cause their cyclical nature. Analysis of long-period sea level and atmospheric pressure spectra revealed the presence of a wave process with a period of approximately 26 days, interpreted as a manifestation of atmospheric-ocean Rossby waves. It is hypothesized that slow current variations induced by planetary waves modulate the phase characteristics of short-period waves and cause the observed cyclicity. The results obtained indicate a potential connection between the phase characteristics of short-period waves and large-scale dynamic processes in the coastal zone.