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澳洲北部越赤道气流强弱变化的成因研究 【作者】刘向文 【导师】孙照渤

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澳洲北部越赤道气流强弱变化的成因研究水利论文Rj'jAW:}f!|

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【作者】刘向文导师孙照渤
.I4v~+M,y9Bj)S;k p0【作者基本信息】南京信息工程大学,气象学,2008年,博士水利论文y-B hs AD

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【中文摘要】 本研究利用1980—2004年的NCEP/NCAR再分析资料,首先对澳洲北部越赤道气流的显著增强和减弱过程进行取样,从中总结样本所对应的南、北半球环流型态,探讨越赤道气流强弱变化的天气成因;挑选5—8各月越赤道气流的极强和极弱年作为典型样本,分析其对应的南、北半球及赤道环流系统的配置特征,探讨强、弱越赤道气流的气候成因;定义强迫因子指标,结合诊断分析和数值试验探讨强迫因子对环流因子及越赤道气流的影响。论文主要得到如下结论:1.越赤道气流的显著增强过程通常对应着通道南侧或北侧从热带到副热带地区的环流调整,这种调整在南半球多表现为澳洲冷空气活动,在北半球多表现为辐合带的变化。根据冷空气槽和澳高的配置情况,南半球环流特征可分为4种型;根据辐合带与西太平洋副高的相对位置,北半球环流特征可分为3种型。2.越赤道气流的显著减弱过程通常对应着通道附近赤道脊或赤道反气旋活动的发生,而后者对应的环流背景往往是北半球热带东、西风的相互抗衡过程(或称为西太副高和北半球辐合带的相互抗衡过程)。3.强越赤道气流在月内主要表现出“高标准维持”的特征,其多由北半球辐合带维持较强,或南半球澳高维持较强,亦或澳洲冷空气...更多活动频繁发生所致,而且其多对应着西太副高偏东或偏北的环流形势。4.弱越赤道气流在月内会主要表现出“低标准维持”或“大振幅振荡”的特征,前者多对应着西太副高偏西或偏南的环流形势,其通道北部的辐合带活动通常较弱;后者多由热带东、西风抗衡过程的多次发生所致,其通道北部的辐合带活动通常偏强。5.冷澳洲大陆通常对应强澳高或频繁冷空气活动,其有利于强越赤道气流的形成;通道南部下垫面偏冷通常对应弱Walker环流,其有利于强越赤道气流的形成;偏暖中南半岛下垫面—偏冷南海下垫面、菲律宾附近强热源多对应北半球较强辐合带,它们都有利于强越赤道气流的形成;弱越赤道气流对应的强迫因子及环流因子的特征则与上述相反。本论文的主要创新点:(1)总结了105°E和125°E越赤道气流显著增强和减弱过程所对应的南、北半球环流型态。越赤道气流增强过程对应的南半球环流型可分为4种,北半球环流型可分为3种;越赤道气流的减弱过程通常对应着通道北部的热带东、西风抗衡过程。(2)从环流配置的角度探讨了强、弱越赤道气流的气候成因。强越赤道气流通常由北半球辐合带维持较强,或南半球澳高维持较强,亦或澳洲冷空气活动频繁发生所致,而且其多对应西太副高偏东或偏北的环流形势;弱越赤道气流通常由西太副高偏西或偏南的环流形势导致,亦或由热带东、西风抗衡过程的多次发生所致。(3)结合诊断分析和数值试验探讨了部分强迫因子对局部环流及越赤道气流的影响情况。冷澳洲大陆有利于强澳高或频繁冷空气活动的形成,通道南部弱下垫面加热有利于弱Walker环流的形成,南海—中南半岛较强海陆热力差异或菲律宾强对流加热有利于通道北部强辐合带的形成,它们都可对应澳洲北部强越赤道气流的形成。  还原

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【英文摘要】 Using the NCEP/NCAR reanalysis data during 1980-2004,this paper firstly samples the obvious reinforcement and decline processes of cross-equatorial flow to the north of Australia,then the southern and northern circulation patterns are summarized from the samples so as to discuss the weather causes of the cross-equatorial flow's reinforcement and decline.Secondly,the strong and weak extremums of cross-equatorial flow during May to August are chose as typical samples,then their relevant configure features of circulation system,in southern and northern hemisphere and equatorial regions,are analyzed so as to discuss the climate causes of strong and weak cross-equatorial flow.Thirdly,some forcing factors are defined and its impacts on circulation factors and cross-equatorial flow are studied with diagnosis analysis and numerical simulation.Main conclusions are shown as follows:1.Corresponding to the obvious reinforcement process of cross-equatorial flow, there is always circulation adjustme...更多nt in the tropical and subtropical zone to the south or north of the channel,and the adjustment mainly denotes the Australia cold air activity in Southern Hemisphere or the variation of convergence zone in Northern Hemisphere.The circulation feature in southern hemisphere can be divided into four types according to the configuration of cold air trough and Australia High,and the circulation feature in northern hemisphere can be divided into three types according to the relative position of convergence zone and Western Pacific Subtropical High(WPSH).2.Corresponding to the reinforcement process of cross-equatorial flow,there is always equatorial ridge or equatorial anticyclone,and its circulation background is the counterwork process between WPSH and convergence zone.3.The strong cross-equatorial flow mainly shows high-standard-maintenance feature in the month,which is always caused by the strong convergence zone in northern hemisphere,or strong Australia High in southern hemisphere,or frequent Australian cold air activities,and it always corresponds to the circulation situation that the location of the WPSH is to the east or north as compared with the normal.4.The weak cross-equatorial flow mainly shows low-standard-maintenance or large-amplitude-oscillation feature.The former always corresponds to the circulation situation that the location of the WPSH is to the west or south as compared with the normal,and there is always weak convergence zone to the north of channel.The latter is always caused by the frequent counterwork processes between WPSH and convergence zone,and there is always strong convergence zone to the north of channel.5.The cold Australia land always corresponds to strong Australian High or frequent cold air activities,which is favorable to the formation of strong cross-equatorial flow;The cold underlaying surface to the south of channel always corresponds to weak Walker circulation,which is also favorable to the formation of strong cross-equatorial flow;The warm Indo-China peninsula and cold South China Sea,as well as the strong heat source near the Philippines,all can correspond to strong convergence zone in north hemisphere,which is favorable to the formation of strong cross-equatorial flow.The features of forcing factors and circulation factors corresponding to weak cross-equatorial flow are opposite to the above features.This paper mainly includes the following innovations:(1)This paper samples the obvious reinforcement and decline processes of 105°E and 125°E cross-equatorial flow,and summarizes their relevant circulation patterns in southern and northern hemisphere.Corresponding to the reinforcement process,the circulation feature can be divided into four types in southern hemisphere and three types in northern hemisphere.The obvious decline process always corresponds to the counterwork process between WPSH and convergence zone.(2)This paper analyzes the formation causes of strong and weak cross-equatorial flow from the view of circulation configuration.Strong cross-equatorial flow is always caused by the strong convergence zone in northern hemisphere,or strong Australia High in southern hemisphere,or frequent Australian cold air activities,and it always corresponds to the circulation situation that the location of the WPSH is to the east or north as compared with the normal.Weak cross-equatorial flow is always caused by the circulation situation that the location of the WPSH is to the west or south as compared with the normal,or by the frequent counterwork processes between WPSH and convergence zone.(3)Using diagnostic analysis and numerical experimentation,this paper studies the impacts of some forcing factors on local circulation and cross-equatorial flow. The cold Australia land is favorable to the formation of strong Australian High or frequent cold air activities,and the weak heating of underlaying surface to the south of channel is favorable to the formation of weak Walker circulation,and the strong heat difference between South China Sea and Indo-China peninsula or the strong convection heating near the Philippines is favorable to the formation of strong convergence zone to the north of chancel,which all can correspond to the strong cross-equatorial flow to the north of Australia.  还原

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#K#Wp,I&CT1L0【中文关键词】 越赤道气流; 增强过程; 减弱过程; 极大(小); 环流因子; 强迫因子
3\t yu7hq0N x_0【英文关键词】 cross-equatorial flow; reinforcement process; decline process; maximum(minimum); circulation factor; forcing factor
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