吴国雄,刘辉,陈飞,赵宇澄,卢莹. 1994. 时变涡动输送和阻高形成──1980年夏中国的持续异常天气[J]. 气象学报, 52(3):308-320, doi:10.11676/qxxb1994.039
时变涡动输送和阻高形成──1980年夏中国的持续异常天气
TRANSIENT EDDY TRANSFER AND FORMATION OF BLOCKING HICH──ON THE PERSISTENTLY ABNORMAL WEATHER IN THE SUMMER OF 1980
投稿时间:1993-01-16  修订日期:1993-04-03
DOI:10.11676/qxxb1994.039
中文关键词:  时变涡动  涡动输送  阻高形成  异常天气
英文关键词:Transient eddy  Eddy transport  Formation of blocking high  Abnormal weather
基金项目:中国科学院“我国长江黄河流域旱涝规律成因与预测研究”;“灾害性气候预测及其对农业年景和水资源调配的影”项目;国家基础性研究重大关键项目“气候动力学和气候预洲理论研究”
作者单位
吴国雄 中国科学院大气物理研究所, 北京, 100080 
刘辉 中国科学院大气物理研究所, 北京, 100080 
陈飞 中国科学院大气物理研究所, 北京, 100080 
赵宇澄 中国科学院大气物理研究所, 北京, 100080 
卢莹 河南省气象局, 郑州, 450003 
摘要点击次数: 2381
全文下载次数: 1972
中文摘要:
      1980年6至8月发生在中国的持续时间长、强度大的南方低温洪涝及北方高温干旱天气与中高纬地区阻塞高压在东北亚持续发展维持有关。本文研究了时变天气系统的输送过程在强迫阻高形成中的作用。结果表明,源于欧洲强斜压带上的天气尺度扰动在东传过程中出现动能转化。这种转化满足双向法则;在向小尺度系统转化的同时,还向时间平均西风急流及大尺度的阻塞系统输送能量。位涡分析也表明,天气尺度系统维持着急流轴南侧的反气旋式平均位涡和北侧的气旋式平均位涡,并在急流分流区下游激发出高纬强烈的反气旋性涡度增长和相应的正变高。研究表明,这种波流相互作用激发阻高增长的过程比着名的1976年夏西欧阻高的发展还强烈得多。因此,在研究中国北方的持续异常天气形势时,除了注意热带、副热带系统的动态外,还必须注意欧洲及西亚地区强斜压带的发展及其上天气尺度系统的传播和输送特征。
英文摘要:
      In the summer of 1980, serious persistently abnormal weather occurred over vast areas in China. The long-lasting of such disasterous weather is mainly due to the stable development and maintenance of blocking anticyclone over the northeastern Asia. This study aims at the understanding of the roles of transient eddy transfer in the formation of the blocking.It was shown that during this period. there appeared continuous generation of synopticscale perturbations along the strong baroclinic zone over Europe and western Asia. While such perturbations propagated eastward, energy conversion occurred. At equivalent barotropic layer with weak dissipation, such energy conversion subjects to the so-called bidirectional principle: while the energy of the synoptic-scale system is cascaded to smaller scale system, a much larger portion is transferred to the blocking system with larger scale. Potential vorticity diagnoses also reveal that transient weather systems play the roles of maintaining the mean anticyclonic vorticity to the south. and mean cyclonic vorticity to the north, of the westerly jet, and exciting strong anticyclonic vorticity growth and corresponding altitude increase in the high latitude area located downstream of the westerly diffluence region. The research also shows that, the intensity of the forcing of blocking formation via wave-mean flow interaction in this Asian case is much stronger than that in western Europe occurred in the summer of 1976. It was therefore concluded that when persistently abnormal weather in the northern China is studied. in addition to the subtropical weather systems, attention should also be drawn to the development of baroclinic zone over Europe and western Asia,and the propagation and transfer properties of synoptic systems embedded in the baroclinic zone.
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