首页> 外文期刊>Dynamics of Atmospheres and Oceans >Modulating synoptic scale convective activity and boundary layer dissipation in the IPESD models of the Madden-Julian oscillation
【24h】

Modulating synoptic scale convective activity and boundary layer dissipation in the IPESD models of the Madden-Julian oscillation

机译:在Madden-Julian振荡的IPESD模型中调节天气尺度对流活动和边界层耗散

获取原文
       

摘要

A self-contained derivation of the IPESD models [Majda, A.J., Klein, R., 2003. Systematic multi-scale models for the tropics. J. Atmos. Sci. 60, 393-408] governing synoptic and planetary scale tropical flows is provided. This derivation demonstrates the analytic tractability of the model and the effect of zonally and meridionally tilted synoptic scale heating on the forcing of planetary scale flows through upscale momentum and temperature fluxes. Exploiting the analytic tractability of the models, different aspects of the planetary scale forcing are traced to meridional and vertical tilts in the synoptic scale heating profile. Variants of the archetypal IPESD models for the Madden-Julian oscillation (MJO) presented in Majda and Biello [Majda, A.J., Biello, J.A., 2004. A multi-scale model for tropical intraseasonal oscillations. Proc. Natl. Acad. Sci. 101, 4736-4741; Biello, J. A., Majda, A.J., 2005. A new multi-scale model for the Madden-Julian oscillation. J. Atmos. Sci. 62, 1694-1721] are studied. In addition to vertically tilted synoptic scale heating, the models discussed herein incorporate upscale zonal momentum flux due to meridional flux convergence arising from meridionally tilted heating. The effect of a boundary layer momentum drag at the base of the free troposphere is also systematically incorporated into the IPESD models. Both meridional tilts and lower boundary layer drag are shown to meridionally confine the MJO westerly wind burst and drive a planetary scale barotropic flow. Meridionally tilted heating can also greatly strengthen the wind burst at the base of the troposphere and modify its vertical profile. The competing effects of meridionally tilted, and off-equatorial heating can also significantly weaken the MJO winds. Appendices are provided which discuss generalizations and a solution algorithm for the IPESD models.
机译:IPESD模型的自成体系[Majda,A.J.,Klein,R.,2003。热带地区的系统多尺度模型。 J.Atmos。科学[60,393-408]提供了控制天气和行星尺度热带流量的方法。该推导证明了该模型的解析易处理性,以及纬向和经向倾斜的天气尺度加热对通过高层动量和温度通量强迫行星尺度流动的影响。利用模型的分析可处理性,行星尺度强迫的不同方面可追溯到天气尺度加热剖面中的子午和垂直倾斜。 Majda和Biello中提出的Madden-Julian振荡(MJO)原型IPESD模型的变体[Majda,A.J.,Biello,J.A.,2004。热带季节内振荡的多尺度模型。程序Natl。学院科学101,4736-4741; Biello,J。A.,Majda,A.J.,2005年。Madden-Julian振动的新的多尺度模型。 J.Atmos。科学62,1694-1721]进行了研究。除了垂直倾斜的天气尺度加热外,本文讨论的模型还包含由于子午通量加热引起的子午通量收敛而产生的高档纬向动量通量。自由对流层底部的边界层动量拖曳效应也被系统地纳入IPESD模型。子午线倾斜和下边界层阻力都在子午线上限制了MJO西风爆发并驱动了行星尺度的正压流。子午线倾斜的加热还可以大大增强对流层底部的风爆发并改变其垂直剖面。子午线倾斜和赤道外加热的竞争效应也可以显着减弱MJO风。提供了附录,这些附录讨论了IPESD模型的概括和解决算法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号