Based on a series of data analyses, the intimate relations between anomalous winter monsoon in East Asia and El Nino arc studied in this paper.Anomalistic circulation in the Northern Hemisphere caused by El Nino event...Based on a series of data analyses, the intimate relations between anomalous winter monsoon in East Asia and El Nino arc studied in this paper.Anomalistic circulation in the Northern Hemisphere caused by El Nino event can lead to enhancing the Ferre! cell and the westerlies in the mid-latitudes as the Hadley cell and result in the location of the front zone in East Asia to the north. These are unfavourable for the cold wave breaking out southward in East Asia. Therefore, there ate warmer weather and weaker winter monsoon in East Asia in El Nino winter.There are stronger and frequent cold waves in East Asia during the wintertime prior to the occurrence of El Nino event. They will induce stronger winter monsoon in East Asia. Thus, the weakened trade wind and enhanced cumulus convection in the equatorial middle-western Pacific area caused by the stronger winter monsoon will play an important role in the occurrence of El Nino event. Therefore, the anomalously strong winter monsoon in East Asia during wintertime might be an important mechanism to cause El Nino event.展开更多
A class of coupled system for the E1 Nifio-Southern Oscillation （ENSO） mechanism is studied. Using the method of variational iteration for perturbation theory, the asymptotic expansions of the solution for ENSO mode...A class of coupled system for the E1 Nifio-Southern Oscillation （ENSO） mechanism is studied. Using the method of variational iteration for perturbation theory, the asymptotic expansions of the solution for ENSO model are obtained and the asymptotic behaviour of solution for corresponding problem is considered.展开更多
应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷暖异常信号的机制。分析表明,西太平洋暖池区的次表层海温异常冷暖与太平洋北赤道流的海温冷暖异常信...应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷暖异常信号的机制。分析表明,西太平洋暖池区的次表层海温异常冷暖与太平洋北赤道流的海温冷暖异常信号西传有重要关系。北赤道流的海温异常冷(暖)信号是沿温跃层由赤道中东太平洋潜沉向西太平洋暖池区传播,对暖池区域次表层海温场产生重要影响。这一传播过程与西太平洋次表层海温异常暖(冷)信号向赤道中东太平洋传播,构成了热带海洋信号的气旋式“信号通道”。在这一“信号通道”中,北赤道流的海温异常信号西传是导致西太平洋暖池区及西太平洋次表层海温异常的重要机制,是影响El Nino和 La Nina事件发生的关键。展开更多
In this paper, some data analyses and theoretical discussion show that there are frequentactivities of stronger aerotroughs (cold surges) in East Asia during the wintertime priorto the occurrence of El Nino, and the d...In this paper, some data analyses and theoretical discussion show that there are frequentactivities of stronger aerotroughs (cold surges) in East Asia during the wintertime priorto the occurrence of El Nino, and the disturbance energies acompanied with the stronger coldsurges in East Asia are frequently dispersed southeastward from Siberia to the central westernPacific. The trade winds will be weakened and the convections will be enhanced over theequatorial central western Pacific by the strong cold surges. Then the El Nino event willoccur. A possible important process or mechanism to cause the El Nino event is suggested.展开更多
文摘Based on a series of data analyses, the intimate relations between anomalous winter monsoon in East Asia and El Nino arc studied in this paper.Anomalistic circulation in the Northern Hemisphere caused by El Nino event can lead to enhancing the Ferre! cell and the westerlies in the mid-latitudes as the Hadley cell and result in the location of the front zone in East Asia to the north. These are unfavourable for the cold wave breaking out southward in East Asia. Therefore, there ate warmer weather and weaker winter monsoon in East Asia in El Nino winter.There are stronger and frequent cold waves in East Asia during the wintertime prior to the occurrence of El Nino event. They will induce stronger winter monsoon in East Asia. Thus, the weakened trade wind and enhanced cumulus convection in the equatorial middle-western Pacific area caused by the stronger winter monsoon will play an important role in the occurrence of El Nino event. Therefore, the anomalously strong winter monsoon in East Asia during wintertime might be an important mechanism to cause El Nino event.
基金Project supported by the National Natural Science Foundation of China （Grant Nos 90111011 and 10471039）, the National Key Basic Research Special Foundation of China （Grant Nos 2003CB415101-03 and 2004CB418304）, the Key Basic Research Foundation of the Chinese Academy of Sciences （Grant No KZCX3-SW-221） and in part by E-Institutes of Shanghai Municipal Education Commission （Grant No N.E03004）.
文摘A class of coupled system for the E1 Nifio-Southern Oscillation （ENSO） mechanism is studied. Using the method of variational iteration for perturbation theory, the asymptotic expansions of the solution for ENSO model are obtained and the asymptotic behaviour of solution for corresponding problem is considered.
文摘应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷暖异常信号的机制。分析表明,西太平洋暖池区的次表层海温异常冷暖与太平洋北赤道流的海温冷暖异常信号西传有重要关系。北赤道流的海温异常冷(暖)信号是沿温跃层由赤道中东太平洋潜沉向西太平洋暖池区传播,对暖池区域次表层海温场产生重要影响。这一传播过程与西太平洋次表层海温异常暖(冷)信号向赤道中东太平洋传播,构成了热带海洋信号的气旋式“信号通道”。在这一“信号通道”中,北赤道流的海温异常信号西传是导致西太平洋暖池区及西太平洋次表层海温异常的重要机制,是影响El Nino和 La Nina事件发生的关键。
文摘In this paper, some data analyses and theoretical discussion show that there are frequentactivities of stronger aerotroughs (cold surges) in East Asia during the wintertime priorto the occurrence of El Nino, and the disturbance energies acompanied with the stronger coldsurges in East Asia are frequently dispersed southeastward from Siberia to the central westernPacific. The trade winds will be weakened and the convections will be enhanced over theequatorial central western Pacific by the strong cold surges. Then the El Nino event willoccur. A possible important process or mechanism to cause the El Nino event is suggested.
