关于阻塞形势演变过程中波数域能量的诊断分析

本文对北半球冬季维持时间较长的三次阻塞形势形成前的纬向平均西风变化以及阻塞过程中波数域动能及其转换进行了诊断分析。分析结果表明：在阻塞形势形成前，由于波流相互作用，使得平均流减弱，并且波流相互作用在太平洋地区和大西洋地区有不同的特点；分析结果还表明：阻塞形势维持期间，由于波波相互作用，行星波异常增幅；而在崩溃期间，也主要通过波波相互作用使得行星波动能减少。

Energetics Examination of the Blocking Episodes in the Northern Hemisphere

In this paper, the variation of zonal mean flow before the formation of three blocking episodes in the Northern Hemisphere which maintained for a long time and the energetics of these three blocking episodes are analysed diagnostically. The analysed results show that before the occurrence of the blocking situation, the zonal wind decreases through the wave--mean flow interaction, and the interaction has different characters over the Pacific and Atlantic. The analysed results also show that the planetary waves are amplified by the wave--wave interaction at the stage of the maintaince of the blocking, and are weakened at the stage of the collapse also mainly by the wave--wave interaction.