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ENSO和西太平洋暖池对我国气候影响的诊断分析研究 总被引:8,自引:1,他引:8
一、引言ENSO是热带最强的气候信号,而西太平洋暖他又是热带西太平洋特有的暖水堆积的现象,两者有十分密切的关系,它们的变化直接影响全球大气环流异常和气候变化,但它们对我国气候究竟有多大影响目前尚无定论的说法。因此,研究这一问题回答两大问题:(1)确定EN-SO和西太平洋暖地对我国气候异常变化的影响程度和它们的相对重要性;(2)仅考虑热带太平洋海温异常变化条件下的海气耦合模式究竟预测我国短期气候变化的能力有多大?二、资料和分析方法1.资料本研究使用四组不同的资料,即(亚)ECMWF300hpa和850hpa格点风场资料… 相似文献
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Diagnosis is undertaken on the origin for the low-frequency component (LFC) of ENSOvariability in the context of 1979—1990 OLR and u-wind datasets.Evidence suggests that ① apower spectrum-yielded maximum,significant statistically,is derived from the OLR monthlyanomalies in a 3—5-year period range over the tropical central/western Pacific;②compositeanalysis of the signals of the monthly anomaly low frequency component (period>3 years)confirms further the dynamic features of the component as documented in Part Ⅰ:③serving asforcing on ENSO,the related monsoon region represents the source area of the component;④theone-point correlation maps of unfiltered OLR monthly anomalies with zonal wind on a lagged,asimultaneous and a leading basis show clearly the close relation between the u wind-associatedeastward travelling low-frequency wave and the low-frequency oscillation of low-latitude central/western Pacific large-scale convection and the east-moving mode is likely to be excited by theoscillation at a 3—5-year period range.It follows that the large-scale convection oscillation showsup as the origin of the eastward waves,i.e.,ENSO LFC. 相似文献
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热带印度洋海温的年际变化与ENSO 总被引:22,自引:3,他引:22
文中讨论了热带印度洋海表温度距平空间分布的年际变化与赤道中东太平洋海温的关系。EOF分析的结果表明 ,印度洋海温的变化主要存在全区符号一致的单极型和西部与东南部符号相反的偶极型 ,它们具有显著的年际变化。小波凝聚谱揭示了单极、偶极的变化与Nino3区海表温度距平存在密切关系 ,印度洋海温距平从偶极到单极的变化对应着ElNi no事件从发展到衰减的过程。平均而言 ,印度洋偶极超前Nino3区海温距平约 4个月 ,单极滞后约 6个月。整个热带印度洋 -太平洋地区海气耦合特征的演变表明 ,与ElNino从发展到衰减相联系的热带西太平洋海气耦合相互作用在印度洋海温距平从偶极到单极的演变过程中起着非常重要的作用。 相似文献
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ENSO对亚洲夏季风异常和我国夏季降水的影响 总被引:21,自引:11,他引:21
首先对ENSO过程中亚洲夏季风环流的变化进行了诊断分析,结果表明在El Nino事件和LaNina事件中亚洲夏季风系统各成员均发生不同程度的变化,甚至出现相反的变异特征。其中,对我国东部地区夏季降水进行了EOF分析,并在此基础上分析了赤道太平洋SS-TA对我国东部地区夏季降水影响的区域和程度,该影响与ENSO循环的发展阶段密切相关,且在长江中下游地区和华南地区最为显著。 相似文献
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利用NCEP2.5°×2.5°再分析资料和FY-2C的空间分辨率为0.1°×0.1°、时间分辨率为1h的TBB资料,分析并描述2007年梅雨过程中西太平洋副热带高压进退过程以及在有利的大尺度背景场下副高北侧中小尺度对流系统的演变特征,并具体分析江淮流域一个中尺度对流系统(MCS)的初生、发展和消亡过程。结果表明:TBB资料可较好地描述西太平洋副热带高压北抬及西进和东退、中断特征,及其强度和位置;当年6月29日至7月10日位于副高北侧、影响江淮流域的降水过程有4次,每次过程包含1~3个中尺度系统生消过程,中尺度对流系统不断生成发展导致当年梅雨期区域性暴雨和大暴雨;MCS个例由两个发展起来的β中尺度深对流系统合并而成,合并后MCS原地停留8h,与活跃于美国中部的中尺度复合体(MCC)外形有相似特征;TBB230K的区域与降水区对应,强降水区与TBB为210~220K的区域对应。 相似文献
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The structural characteristics of 2004 typhoon Aere’s precipitation are analyzed using the
high-resolution data from the Tropical Rainfall Measuring Mission (TRMM) of the National Aeronautics
Space Administration (NASA). It is found that the typhoon’s characteristics vary at different stages of its
development. To analyze the asymmetric causation of precipitation distribution, data from the National
Center for Environmental Prediction (NCEP) reanalysis are used to calculate the vertical integral of the
water vapor flux vector. The results show that because of this process, along with the unique phenomenon
of twin-typhoon circulation, the easterly air current of the typhoon’s northern side and the southwesterly air
current of its southern side play a joint role in transporting water vapor. Furthermore, its transport effects
vary greatly at the different stages of development, showing the peculiarity of the water source for this
typhoon process. The distributions of the typhoon convection area—characterized by heavy precipitation
and a maximum-value area of the water vapor flux, as well as a strong ascending-motion area—differ at
different stages of the typhoon’s development. The non-uniform distribution of water vapor flux and the
vertical motion bring about asymmetrical distribution of the typhoon precipitation. 相似文献
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ENSO期热带太平洋和印度洋海温异常对亚洲夏季风变异影响的数值研究 总被引:5,自引:0,他引:5
本文采用AGCM研究了ENSO期间热带太在和印度洋SSTA对亚洲夏季风变异影响的特点和相对重要性。 相似文献
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