| 30-60-day Oscillations of Convection and Circulation Associated with the Thermal State of the Western Pacific Warm Pool during Boreal Summer |
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| 作者姓名： | REN Baohu HUANG Ronghui |
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| 作者单位： | [1]SchoolofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026 [2]InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029 |
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| 基金项目： | This work was supported bythe National Natural Science Foundation of China underGrant No,国家重点基础研究发展计划(973计划),LASG |
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| 摘 要： | This study focuses on the characteristics of the 30-60-day oscillation (MJO) associated with the interannual variability of the thermal state in the western Pacific warm pool. The composite results show that the amplitude of MJO convection over the tropical western Pacific tends to intensify (reduce) in the WARM (COLD) case. The negative correlations between MJO convection in the WARM and inthe COLD cases are examined to be significant over most of the Asian-Pacific region. The evolutions of MJO convection and lower circulation, on the one hand, exhibit larger differences between the WARM and COLD cases, but on the other hand, display a unique feature in that a well-developed MJO cyclone (anticyclone) is anchored over the Asian-Western Pacific domain at the peak enhanced (suppressed) MJO convection phase over the western Pacific warm pool, either in the WARM or in the COLD case. This unique feature of MJO shows a Gill-type response of lower circulation to the convection and is inferred to be an inherent appearance of MJO. The context in the paper suggests there may exist interactions between MJO and the interannual variability of the thermal state in the western Pacific warm pool.
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| 关 键 词： | 30-60-日振动 对流 西太平洋暖池 热态 大气环流 大气动力学 |
30–60-day oscillations of convection and circulation associated with the thermal state of the western Pacific warm pool during boreal summer |
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| REN Baohu,HUANG Ronghui.30-60-day Oscillations of Convection and Circulation Associated with the Thermal State of the Western Pacific Warm Pool during Boreal Summer[J].Advances in Atmospheric Sciences,2003,20(5):781-793. |
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| Authors: | REN Baohua HUANG Ronghui |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026;LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | This study focuses on the characteristics of the 30 60-day oscillation (MJO) associated with theinterannual variability of the thermal state in the western Pacific warm pool. The composite resultsshow that the amplitude of MJO convection over the tropical western Pacific tends to intensify (reduce)in the WARM (COLD) case. The negative correlations between MJO convection in the WARM and inthe COLD cases are examined to be significant over most of the Asian-Pacific region. The evolutions of MJO convection and lower circulation, on the one hand, exhibit larger differences between the WARMand COLD cases, but on the other hand, display a unique feature in that a well-developed MJO cyclone(anticyclone) is anchored over the Asian-Western Pacific domain at the peak enhanced (suppressed) MJO convection phase over the western Pacific warm pool, either in the WARM or in the COLD case. Thisunique feature of MJO shows a Gill-type response of lower circulation to the convection and is inferred tobe an inherent appearance of MJO. The context in the paper suggests there may exist interactions between MJO and the interannual variability of the thermal state in the western Pacific warm pool. |
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| Keywords: | 30-60-day oscillation western Pacific warm pool thermal states convection circulation |
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