Abstract
An excitation of inertial oscillation in the upper layer east of course of Typhoon 9019 was fortuitously observed at three surface buoys deployed during the Ocean Mixed Layer Experiment (OMLET). The observed inertial oscillation was compared with wind fluctuation measured at Ocean Weather Station T (29°N, 135°E) which was placed at the center of a triangle with three vertexes occupied by the respective surface buoys. Inertial oscillation is effectively excited in the mixed layer at the eastern margin of the typhoon by a rapid decrease of wind rather than by prevailing strong wind. It is shown by means of a least square deviation that the inertial oscillation observed in the mixed layer has a period of 23.9 hours shorter than the local inertial period of 24.7 hours. This shorter period suggests that the inertial oscillation has the finite velocities of phase and group as an inertial internal wave. A theoretically obtained ratio of vertical component of group velocity to that of phase velocity, approximately agrees with observed value. The inertial internal wave is excited by fluctuation of divergence with near inertial period in the mixed layer.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
David, A. B. (1983): The wake of hurricane Allen in the Western Gulf of Mexico.J. Phys. Oceanogr.,13, 117–129.
Day, C. G. and F. Webster (1965): Some current measurements in the Sargasso Sea.Deep-Sea Res.,12, 805–814.
Gill, A. E. (1984): On the behavior of internal waves in the wakes of storms.J. Phys. Oceanogr.,14, 1129–1151.
Johnson, W. R., J. C. Van Leer and C. N. K. Mooers (1976): A cyclesonde view of coastal upwelling.J. Phys. Oceanogr.,6, 556–574.
Kundu, P. K. (1976): An analysis of inertial oscillations observed near Oregon Coast.J. Phys. Oceanogr.,6, 879–893.
Lai, D. Y. and T. B. Sanford (1986): Observations of hurricane-generated, near-inertial slope modes.J. Phys. Oceanogr.,16, 657–666.
LeBlond, P. H. and L. A. Mysak (1978):Waves in the Ocean. Elsevier Scientific Publishing Company, New York, 602 pp.
Pollard, R. T. (1970): On the generation by winds of inertial waves in the ocean.Deep-Sea Res.,17, 795–812.
Pollard, R. T. (1980): Properties of near-surface inertial oscillations.J. Phys. Oceanogr.,10, 385–398.
Pollard, R. T. and R. C. Millard (1970): Comparison between observed and simulated wind-generated inertial oscillations.Deep-Sea Res.,17, 813–821.
Price, J. F. (1983): Internal wave wake of a moving storm. Part 1: Scales, energy budget and observations.J. Phys. Oceanogr.,13, 949–965.
Taira, K., S. Kitagawa, H. Otoba and T. Asai (1993): Observation of temperature and velocity from a surface buoy moored in the Shikoku Basin (OMLET-88)—An oceanic response to a typhoon.J. Oceanogr.,49, 397–406
Veronis, G. (1956): Partition of energy between geostrophic and nongeostrophic oceanic motions.Deep-Sea Res.,3, 157–177.
Weller, R. A. (1982): The relation of near-inertia motions observed in the mixed layer during the JASIN (1978) experiment to the local wind stress and to the quasi-geostrophic flow field.J. Phys. Oceanogr.,12, 1122–1136.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Maeda, A., Uejima, K., Yamashiro, T. et al. Near inertial motion excited by wind change in a margin of the Typhoon 9019. J Oceanogr 52, 375–388 (1996). https://doi.org/10.1007/BF02235931
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02235931