On the formation and maintenance of the stratospheric surf zone as inferred from the zonally averaged potential vorticity distribution

On the formation and maintenance of the stratospheric surf zone as inferred from the zonally averaged potential vorticity distribution
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从纬向平均位涡分布推断平流层冲浪区的形成与维持

DOI:
10.1002/qj.2377
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发表时间:
2014
影响因子:
8.9
通讯作者:
Scott R
Scott R
中科院分区:
地球科学3区
文献类型:
--
作者:
Scott R

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在转换的欧拉平均浅水系统中,涡动位涡通量和Eliassen-Palm通量辐合之间的诊断关系被用来推断建立平流层冲浪区所需的通量辐合,该冲浪区包括一个完全均匀化的位涡区域,或者维持冲浪区在稳定状态以对抗辐射弛豫的恢复效应。在瞬态情况下,当波破碎被假定为在比辐射时间尺度更短的时间尺度上混合位涡时,所需的通量收敛比维持流处于远离辐射平衡的稳态所需的通量收敛大一个数量级。
The diagnostic relation between eddy potential vorticity flux and Eliassen–Palm flux convergence in the transformed Eulerian mean shallow‐water system is used to infer the flux convergence needed to establish a stratospheric surf zone comprising a single region of perfectly homogenized potential vorticity, or to maintain the surf zone in steady state against the restoring effect of radiative relaxation. In the transient case, and when wave breaking is assumed to mix potential vorticity on time‐scales shorter than the radiative time‐scale, the required flux convergence is an order of magnitude larger than that required to maintain the flow in steady state away from radiative equilibrium.
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