第39回 ESCセミナー
Simulations of stratified turbulence surrounding Meddy structures
- 日時
- 2008年6月26日(木) 16:00 - 17:00
- 場所
- 横浜研究所 情報技術棟5F 会議室
- 講演者
- Dr.Lien Hua (IFREMER, Laboratoire de Physique des Oceans, Brest)
- 使用言語
- 英語
要旨
Recently available geosismic data in the North-East Atlantic ocean have revealed ubiquituous "pancake"-like layers of temperature anomaly of 30-60 meters thickness, surrounding the abundant Meddy structures within the Mediterranean Water outflow. The depths of pancake-like layering unambiguously coincide with potential energy spectra in kh-5/3,-- where kh is the horizontal wavenumber--, reminiscent of non-rotating stratified turbulence results.
Using high resolution simulations of a Meddy structure, with a horizontal grid size down to 100m and a vertical grid size of 3m, we have been able to reproduce the pancake-like layering surrounding the eddy. Moreover potential and kinetic energy with kh-5/3 inertial ranges have been simulated. A rationaleis proposed for the formation mechanism of the layering and we discuss the influence of rotation onstratifed turbulence properties.
問い合わせ先
地球シミュレータセンター大淵 済
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