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厄尼诺现象与山东旱涝的关系 总被引：2，自引：0，他引：2
本文根据186O年以来的33次厄尼诺现象,分别对其发生的当年和次年与山东省的旱涝及夏季西太平洋副高的某些特征量进行统计分析。结果表明,不同类型的厄尼诺现象对副高和山东旱涝有不同影响,其中弱厄尼诺现象的当年和次年夏季副高脊线较常年偏北,我省涝多于旱;强厄尼诺年我省旱涝发生频繁,出现旱涝的机率明显多于气候平均值;持续性厄尼诺过程的当年,夏季副高脊线较常年偏南,我省出现旱灾的机率为涝灾机率的2.8倍。 相似文献
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厄尼诺与南海的台风活动 总被引：4，自引：0，他引：4
本文对厄尼诺年(赤道东太平洋SST有持续正距平)和反厄尼诺年(赤道东太平洋SST有持续负距平)南海的台风(包括进入南海的西太平洋台风和在南海生成的台风)活动进行了统计分析。结果表明,厄尼诺同南海的台风活动有明显关系:厄尼诺年平均台风数偏少,反厄尼诺年平均台风数偏多,其异常主要发生在8—11月份;在两广沿海登陆的平均台风数也是厄尼诺年偏少,反厄尼诺年偏多,其异常以10和11月最显著;在北部湾海域活动的台风多在8—9月份,也是厄尼诺年偏少,反厄尼诺年偏多。文本也对厄尼诺如何影响南海的台风活动提出了初步看法。 相似文献
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厄尼诺（ENSO）现象与玉林倒春寒天气关系 总被引：1，自引：0，他引：1
利用５０年代以来厄尼诺现象与同期玉林倒春寒资料进行研究,发现厄尼诺年和厄尼诺结束次年与玉林有否倒春寒无对应关系,但存在周期性。厄尼诺连续年和厄尼诺结束次年有否倒春寒天气出现与厄尼诺开始年是否是倒春寒年成反相关。 相似文献
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利用５０年代以来厄尼诺现象与同期玉林倒春寒资料进行研究,发现厄尼诺年和厄尼诺结束次年与玉林有否倒春寒无对应关系,但存在周期性。厄尼诺连续年和厄尼诺结束次年有否倒春寒天气出现与厄尼诺开始年是否是倒春寒年成反相关。 相似文献
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本文分析了近百年西北太平洋台风路径与厄尼诺的关系,得出了在厄尼诺年,西太平洋(120°E以东)转向的台风路径比在反厄尼诺年偏多,而西行路径则偏少。厄尼诺与反厄尼诺年的台风路径差异主要是受副高形势的影响,有明显的月际差异。 相似文献
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厄尼诺现象与北太平洋海温及云量场关系的初步分析 总被引：1，自引：0，他引：1
本文应用经验正交函数的方法展开北太平洋海温场和西太平洋云量场,分析厄尼诺年尤其是1982-1983年厄尼诺年的特点。同时,结合北太平洋信风、南方涛动、南极海冰等对厄尼诺年作了一些初步的探讨。 相似文献
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厄尼诺（El—Nino）与广西异常气候关系研究 总被引：1，自引：1，他引：0
应用统计分析方法,分析厄尼诺（El-Nino) 与广西气温,降水及各种灾害性天气的统计特征,结果表明厄尼诺对广西的异常气修是有一定的影响的：（1）厄尼诺年,广西的月气温,月降水出现异常概率分别为69％,75％,（2）厄尼诺年易出现春,秋季异常低温,春季多倒春寒,秋季塞露风日数偏多,（3）厄尼诺影响,引起广西部分江河致洪,而引起全区性洪涝机率较小,易造成广西异常干旱。 相似文献
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Complex Singular Value Decomposition(CSVD)analysis technique was applied to study theQuasi Four year Oscillation(QFO)of air sea interaction and its coupled pattern evolution duringdifferent phases.Results show that:(1)CSVD method can better reveal phase relation betweentwo physical fields:(2)Not only northerly anomalies from Northern Hemisphere but alsosoutherly anomalies from Southern Hemisphere contribute to EI Nino.They converge in westernequatorial Pacific,leading to outburst of strong equatorial westerly anomalies,and result in strongEl Nino event onset:(3)An abnormal subtropical anticyclone circulation appears overnorthwestern Pacific while El Nino developing.It favors transitions from the warm SST(EINino)to the cold SST(La Nina),just as the tropical westerly anomalies produced by abnormalcyclone during a decaying La Nina.which encourage the development of El Nino:(4)Thewesterly anomalies in equatorial Pacific are mainly induced by eastward abnormal subtropicalcyclone pairs,which are located in north and south Pacific respectively,and are not the eastwardwesterly anomalies from equatorial Indian Ocean. 相似文献
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Complex Singular Value Decomposition(CSVD)analysis technique was applied to study the Quasi Four year Oscillation(QFO)of air sea interaction and its coupled pattern evolution during different phases.Results show that:(1)CSVD method can better reveal phase relation between two physical fields:(2)Not only northerly anomalies from Northern Hemisphere but also southerly anomalies from Southern Hemisphere contribute to EI Nino.They converge in western equatorial Pacific,leading to outburst of strong equatorial westerly anomalies,and result in strong El Nino event onset:(3)An abnormal subtropical anticyclone circulation appears over northwestern Pacific while El Nino developing.It favors transitions from the warm SST(EINino)to the cold SST(La Nina),just as the tropical westerly anomalies produced by abnormal cyclone during a decaying La Nina.which encourage the development of El Nino:(4)The westerly anomalies in equatorial Pacific are mainly induced by eastward abnormal subtropical cyclone pairs,which are located in north and south Pacific respectively,and are not the eastward westerly anomalies from equatorial Indian Ocean. 相似文献
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Soon-Il An 《Theoretical and Applied Climatology》2004,78(4):203-215
Summary The interannual variability of sea surface temperature (SST) anomalies in the tropical Indian Ocean is dominated mainly by a basin-scale mode (BM) and partly by an east–west contrast mode (zonal mode, ZM). The BM reflects the basin-scale warming or cooling and is highly correlated with El Nino with 3- to 6-month lags, while the ZM is marginally correlated with El Nino with 9-month lags.During an El Nino, large-scale anomalous subsidence over the maritime continent occurs as a result of an eastward shift in the rising branch of the Walker circulation suppresses convection over the eastern Indian Ocean, allowing more solar radiation over the eastern Indian Ocean. At the same time, the anomalous southeasterly wind over the equatorial Indian Ocean forces the thermocline over the western Indian Ocean to deepen, especially in the southern part. As a result, SST over the whole basin increases. As El Nino decays, the subsidence over the maritime continent ceases and so does the anomalous southeasterly wind. However, the thermocline perturbation does not quickly shoal back to normal because of inertia and it disperses as Rossby waves. These Rossby waves are reflected back as an equatorial Kelvin wave, causing deepening of the thermocline in the eastern Indian Ocean, and preventing SSTs from cooling in that region. Moreover, the weaker wind speed of the monsoon circulation results in less latent heat loss, and thus warms the eastern Indian Ocean. These two processes therefore help to maintain warm SSTs over the eastern Indian Ocean until fall. During the fall, the warm SST over the eastern Indian Ocean and the cold SST over the western Indian Ocean are enhanced by air–sea interaction and the ZM returns. The ZM dissipates through the seasonal reversal of the monsoon atmospheric circulation and the boundary-reflected Kelvin wave. In the same manner, a basin-scale cooling in the tropical Indian Ocean can induce the ZM warming in the west and cooling in the east. 相似文献
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AIR-SEA COUPLING FEATURES FROM THE WARM PHASE TO THE COLD PHASE OF ENSO CYCLES IN THE SEVENTIES TO THE EIGHTIES* 
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下载免费PDF全文 Using the sea surface temperature and wind anomalies(SSTA and SSWA for short) of the tropical Pacific from January 1970 to December 1989,main spatial patterns of tropical Pacific SSTA and SSWA coupling features in the transform course from the warm phase to the cold phase of El Nino-southern Oscillation(ENSO) cycles are discussed.The main conclusions are as follows:(1)air-sea coupling patterns at the mature stage of El Nino(La Nina) are main spatial ones of tropical Pacific SSWA and SSTA coupling:(2)at the mature stage of El Nino,the interaction of the anticyclonic anomaly wind,generated by the forcing of distinct meridional SSTA gradient in the Northern Hemisphere tropical central Pacific.with the California cold current and SSTA is mainly responsible for weakening of El Nino;(3)the second sea temperature increase along the South American coast in the decaying course of El Nino results from the eastward movement of the weakened positive SSTA in the tropical central-eastern Pacific forced by anomalous west wind stress:(4)La Nina results from the joint effect of Walker circulation,Ekman drift and negative SSTA in the tropical central-eastern Pacific. 相似文献
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POSSIBLE INFLUENCES OF THE TROPICAL INDIAN OCEAN DIPOLE ON THE EASTWARD PROPAGATION OF MJO 总被引：1，自引：0，他引：1
Based on multiple datasets, correlation and composite analyses, and case studies, this paper investigated possible influences of the Indian Ocean dipole （IOD） mode on the eastward propagation of intraseasonal oscillation in the tropical atmosphere. The results showed that （1） the 30-60 day outgoing longwave radiation anomalies in the southeastern Indian Ocean and the 30-60 day 850-hPa zonal wind anomalies over the equatorial central Indian Ocean were significantly correlated with the IOD index; （2） during positive IOD years, the anomalously cold water in the southeastern Indian Ocean and the 850-hPa anomalous easterlies over the equatorial central Indian Ocean might act as barriers to the continuously eastward propagation of the intraseasonal convection, which interrupts the Madden-Julian oscillation （MJO） propagation in the eastern equatorial Indian Ocean and western Pacific; and （3） during negative IOD years, the anomalously warm water in the southeastern Indian Ocean and the low-level westerly anomalies over the equatorial central Indian Ocean favor the eastward movement of MJO. 相似文献
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利用近50a的美国Maryland大学全球海洋同化分析资料和NCEP全球大气再分析资料，分析了与ElNino相联系的热带太平洋有效位能（APE）的时空演变过程，从有效位能变化角度揭示了50年来ElNino的年代际变化特征。结果表明，热带太平洋ElNino年代际变化特征主要表现为在20世纪70年代末期以前与其后的显著不同。在有效位能异常变化的振幅和频率方面，20世纪70年代末期以后，振荡的振幅显著增,大直频率变慢。在有效位能异常变化的振幅和频率方面，70年代末期以前，ElNino事件的先兆是有效位能先在热带西太平洋异常积累，然后这些积累的有效位能沿赤道快速向东传播并释放能量，使得东太平洋出现能量的异常，东太平洋的有效位能减少，产生ElNino事件；70年代末期以后，ElNino事件的建立没有表现异常的有效位能在热带西太平洋的积累，其建立表现为赤道中太平洋直接出现的局地有效位能的异常，然后表现为不稳定海气耦合模态增幅性地缓慢向东传播，使得东太平洋的有效位能减少，发生ElNino事件。 相似文献
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Summary In this paper, we first examine the relationship of El Nino and La Nina events with the westerly wind anomalies over the
western Pacific warm pool. On this basis, the roles of the Asian and Australian winter monsoons in the formation and progress
of the westerly wind anomalies are studied. Finally, we analyze the associations of the Asian and Australian winter monsoons,
the westerly wind anomalies and the El Nino and La Nina alternations with the propagating anomalies of the Southern and Northern
Oscillation.
The results show that the westerly wind bursts are frequent over the Maritime Continent and western Pacific, only those which
can further intensify and propagate eastward are accompanied by an El Nino event. It is identified that the establishment
and eastward propagation of westerly wind bursts are related to enhanced East Asian and Australian winter monsoon, respectively.
The activities of the East Asian and Australian winter monsoon, the variation of the Pacific westerly and trade winds and
the alternate appearance of El Nino and La Nina events should be internally connected. The main agents of this relationship
are the eastward propagation of alternate positive and negative height anomalies associated with the Southern and Northern
Oscillation on a 3–5 year time scale over the south and north tropical Pacific.
Received January 4, 1998/Revised January 19, 1999 相似文献
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Using the sea surface temperature and wind anomalies(SSTA and SSWA for short)of thetropical Pacific from January 1970 to December 1989,main spatial patterns of tropical PacificSSTA and SSWA coupling features in the transform course from the warm phase to the cold phaseof El Nino-southern Oscillation(ENSO)cycles are discussed.The main conclusions are as follows:(1)air-sea coupling patterns at the mature stage of ElNino(La Nina)are main spatial ones of tropical Pacific SSWA and SSTA coupling:(2)at themature stage of El Nino,the interaction of the anticyclonic anomaly wind,generated by the forcingof distinct meridional SSTA gradient in the Northern Hemisphere tropical central Pacific.with theCalifornia cold current and SSTA is mainly responsible for weakening of El Nino;(3)the secondsea temperature increase along the South American coast in the decaying course of El Nino resultsfrom the eastward movement of the weakened positive SSTA in the tropical central-eastern Pacificforced by anomalous west wind stress:(4)La Nina results from the joint effect of Walkercirculation,Ekman drift and negative SSTA in the tropical central-eastern Pacific. 相似文献