A theory of semigeostrophic gravity waves and its application to the intrusion of a density current along a coast - Part 1. Semigeostrophic gravity waves

Atsushi Kubokawa, Kimio Hanawa

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Semigeostrophic gravity waves associated with a coastal boundary current, which has finite and uniform potential vorticity and is bounded away from the coastline by a density front on the ocean surface, are investigated. It is shown that the semigeostrophic coastal current has two waves which are named here the Semigeostrophic Coastal Wave (SCW) and the Semigeostrophic Frontal Wave (SFW). The SCW becomes an elementary Kelvin wave at some limit while the SFW is caused by the existence of the surface density front. The SCW appears mainly as variations in the upper layer depth at the coast and as alongshore velocity at the density front. On the other hand, the SFW appears mainly as variations in the width of the current. When the weak nonlinearity and ageostrophic effect are included, these semigeostrophic gravity waves satisfy the Kortweg- de Vries equation, which suggests that the local changes in the width and/or velocity of the semigeostrophic coastal current propagate as wave-like disturbances.

本文言語English
ページ(範囲)247-259
ページ数13
ジャーナルJournal of the Oceanographical Society of Japan
40
4
DOI
出版ステータスPublished - 1984 8 1

ASJC Scopus subject areas

  • 環境科学(全般)
  • 土壌科学
  • 工学(全般)
  • 地表過程
  • 地球惑星科学(全般)

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