摘要
本文建立了风场强迫下考虑瑞利摩擦的水平二维正压准平衡海洋模型,并对中纬度大尺度风场强迫的情况做了解析求解。结果表明,在近地面西风急流的强迫下,在理想海洋的西海岸以东会出现由气旋涡与反气旋涡构成的涡旋偶;当西风强迫越大,粘性越小时其强度越大,而β越大,β通道的半宽越小,则其沿纬向的变化越剧烈;该涡旋偶的性质属准平衡的涡旋波。将该结果与北太平洋上层流场异常的复EOF分析的第一模态作比较后可见,两者有类似之处。最终,该海洋模型的解则趋于该风场强迫特解。
The two-dimensional barotropic quasi-equilibrium oceanic model including Rayleigh friction forced by wind field is established, and the analytic solution of the model forced by large-scale wind is resolved. The results show that under the forcing of the near surface westerly jet, the vortex dipole with cyclone and anticyclone appears in the east of the idealized oceanic western boundary. The vortex dipole is quasi-equilibrium vortex wave, the stronger the westerly is or the smaller the friction is, the more intense it becomes, besides the bigger the β value or the wider the β channel, the sharper the zonal changes become. Moreover, there are some resemblances between the analytic results and the first mode flow field diagnosed by the Complex Empirical Orthogonal Function. Finally, the oceanic model＇s solutions tend to the particular solution forced by wind.
出处
《气象科学》
CSCD
北大核心
2011年第1期11-16,共6页
Journal of the Meteorological Sciences
基金
国家重点基础研究发展计划(973计划)项目(2007CB411805)
关键词
正压
准平衡
海洋模型
中纬度
风场强迫
Barotropic
Quasi-equilibrium
Oceanic model
Mid-latitude
Wind forcing
