王作述,张若军,彭正义. 1990. AMEX期间一个热带风暴发展的动能收支及环流特征[J]. 气象学报, 48(3):318-326, doi:10.11676/qxxb1990.039
AMEX期间一个热带风暴发展的动能收支及环流特征
THE KINETIC ENERGY BUDGET AND CIRCULATION BACKGROUND OF TROPICAL STORM IRMA DURING AMEX PHASE Ⅱ
投稿时间:1988-03-10  修订日期:1988-12-21
DOI:10.11676/qxxb1990.039
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英文关键词:
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作者单位
王作述 国家气象局气象科学研究院 
张若军 国家气象局气象科学研究院 
彭正义 国家气象局气象科学研究院 
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中文摘要:
      利用中、美、澳联合进行的澳大利亚季风试验(AMFX)第二阶段观测资料,对南半球热 带风暴Irma的发展,进行了环流背景和动能收支的分析。Irma发生于南半球的ITCZ上,生成时的环流条件是ITCZ两侧偏东信风、偏西季风都在加强,尤其是对流层上部气流散开区移近,辐散强烈增加。同时,对流层下半部的R1数出现最小值。Irma迅速增加时,总动能增加主要来自制造项,说明这时有很强的非地转加速。而对制造的最大贡献者,是有效位能的释放。由此表明了内源和积云对流总体影响的重要性。而Irma迅速增强时涡动能的增加,最重要的源是较小尺度运动或次网格尺度动能,主要贡献在对流层上部。少量的贡献来目区域平均气流动能的转换。因此,扰动的发展,从较大、较小两种尺度运动中都取得能量,但后者重要得多。制造项也有重要作用,但主要贡献在对流层下部。此外,扰动还向周围大气输出涡动动能,因此起着祸动动能制造并输出的作用。
英文摘要:
      Using the data from observation on Chinese research vessel Xiang Yang Hong No.5 and other sources during AMEX Phase Ⅱ, the kinetic energy budget and circulation background of tropical storm Irma was analyzed.Irma was formed on the ITCZ of the Southern Hemisphere. That the easterlies trade and westerlies monsoon on both sides of the ITCZ strengthened, the strong divergent flow in upper troposphere emerged, and the Richardson number (Ri) in middle and lower troposphere decreased to a minimum, contributed much to the formation of Irma. The largest contribution to increasing kinetic energy in the general flow was generation term-[V·∇ø].As to the generation term, the conversion of available potential energy to kinetic energy-[ωα] was the largest contribution. It suggested that strong ageostrophic acceleration was existed, and the internal sources and the ensemble effect of cumulus convection played an important role in increasing kinetic energy of Irma.To the increasing of eddy kinetic energy during the period of Irma rapidly intensifying, the most important source was dissipation term and the minor source was the energy conversion from the kinetic energy of area-mean flow to eddy kinetic energy. Therefore, the eddy kinetic energy of developing tropical disturbance is extracted both from smaller and larger scale motion. On the other hand, the disturbance generates and exportes eddy kinetic energy to enviromental atmosphere acting as a generator and exporter of eddy kinetic energy.
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