正在加载图片...
Baroclinic eddies baroclinic instability Baroclinic Instability-"is an instability that arises in rotating, stratified fluids that are subject to a horizontal temperature gradient". From A to B:negative buoyant density increasing If A and C are interchanged: low density high temperature PE=∫pgdk density decreasing PE) high density low temperature a is called mixing slope. warm cold If a <o,a loss of potential energy. If a= 20,△E is strongest. 授课教师:张洋10If ↵ = 1 2 ￾, ￾P E is strongest. ↵ is called mixing slope. 授课教师:张洋 10 Baroclinic eddies - baroclinic instability n Baroclinic Instability - “is an instability that arises in rotating, stratified fluids that are subject to a horizontal temperature gradient”. i i i i i i i i ) ) ⇥ ￾ A B C high density low density low temperature high temperature density increasing density decreasing Fig. 6.9 A steady basic state giving rise to baroclinic instability. Potential density de￾creases upwards and equatorwards, and the associated horizontal pressure gradient is balanced by the Coriolis force. Parcel ‘A’ is heavier than ‘C’, and so statically sta￾ble, but it is lighter than ‘B’. Hence, if ‘A’ and ‘B’ are interchanged there is a release of potential energy. From Vallis (2006) From Vallis (2006) warm cold From A to B: negative buoyant If A and C are interchanged: y fu   b z  0  b  g y b z u  v  w  0 S N X X X X X  PE  gdz PE g z z z z gz z  g z   A A B B  A B  B A  A  B A  B                         1 2 y L gL z L y PE g z g L L ￾P E = gL2 @⇢ @y ↵ ✓ 1 ￾ ↵ ￾ ◆ If ↵ < ￾, a loss of potential energy.
<<向上翻页向下翻页>>
©2008-现在 cucdc.com 高等教育资讯网 版权所有