A variational derivation of the geostrophic momentum approximation
A variational derivation of the geostrophic momentum approximation
复制标题
地转动量近似的变分推导
DOI:
10.1017/jfm.2014.309
复制
发表时间:
2014
影响因子:
3.7
通讯作者:
M. Oliver
中科院分区:
文献类型:
--
作者:
M. Oliver
This paper demonstrates that the shallow water semigeostrophic equations arise from a degenerate second-order Hamilton principle of very special structure. The associated Euler–Lagrange operator factors into a fast and a slow first-order operator; restricting to the slow part yields the geostrophic momentum approximation as balanced dynamics. While semigeostrophic theory has been considered variationally before, this structure appears to be new. It leads to a straightforward derivation of the geostrophic momentum approximation and its associated potential vorticity law. Our observations further affirm, from a different point of view, the known difficulty in generalizing the semigeostrophic equations to the case of a spatially varying Coriolis parameter.
登录
查看更多内容
影响因子:
3.7
作者:
M. Oliver
通讯作者:
M. Oliver
DOI:
10.1016/s0167-2789(02)00375-5
发表时间:
2002
期刊:
Physica D: Nonlinear Phenomena
影响因子:
--
作者:
J. Vanneste;O. Bokhove
通讯作者:
O. Bokhove
影响因子:
2.5
作者:
M. Cullen;W. Gangbo
通讯作者:
W. Gangbo
DOI:
10.1142/p375
发表时间:
2006
期刊:
Neural networks : the official journal of the International Neural Network Society
影响因子:
--
作者:
M. Cullen
通讯作者:
M. Cullen
影响因子:
3.7
作者:
M. Cullen;R. Douglas;I. Roulstone;M. J. Sewell
通讯作者:
M. J. Sewell