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楼主 |
发表于 2010-1-6 15:07
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JMA E-P 通量監察:
JMA對E-P 通量解釋:
The direction of the E-P flux is proportional to the group velocity and indicates the direction of the propagation of the waves. Approximately, the vertical and horizontal components of the E-P flux are proportional to the eddy heat and momentum flux, respectively. The divergence of E-P flux is proportional to the northward flux of quasi-geostrophic potential vorticity, so that it is a direct measure of the total forcing of the zonal-mean flow by eddies. Therefore, the E-P flux and its divergence are important and useful to diagnose planetary waves propagation as well as the effective mean zonal force induced by the waves.
簡言而之, E-P 通量和行星波的群速有莫大關係,E-P 通量的分量渦流熱及動量;而根據波流相互原理,E-P 通量的散度和緯向風加速度有明顯關係,當E-P 通量有向赤道分量的傳播時,E-P通量出現輻散,繞極緯向風(西風)將加速,而當E-P 通量有向極向上分量的傳播時,E-P通量出現輻合,繞極緯向風(西風)將減速
圖1是當正位勢米異常下傳時,E-P 通量的變化: |
组图打开中,请稍候......
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