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Volume 29 Issue 3

May  2012

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2012 >  29(3): 484-492

The Effect of Transient Eddy on Interannual Meridional Displacement of Summer East Asian Subtropical Jet

  • 1.

    Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210093;Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210093


doi: 10.1007/s00376-011-1113-5

  • Using ERA-40 reanalysis daily data for the period 1958--2002, this study investigated the effect of transient eddy (TE) on the interannual meridional displacement of summer East Asian subtropical jet (EASJ) by conducting a detailed dynamical diagnosis. The summer EASJ axis features a significant interannual coherent meridional displacement. Associated with such a meridional displacement, the TE vorticity forcing anomalies are characterized by a meridional dipole pattern asymmetric about the climatological EASJ axis. The TE vorticity forcing anomalies yield barotropic zonal wind tendencies with a phase meridionally leading the zonal wind anomalies, suggesting that they act to reinforce further meridional displacement of the EASJ and favor a positive feedback in the TE and time-mean flow interaction. However, The TE thermal forcing anomalies induce baroclinic zonal wind tendencies that reduce the vertical shear of zonal wind and atmospheric baroclinicity and eventually suppress the TE activity, favoring a negative feedback in the TE and time-mean flow interaction. Although the two types of TE forcing tend to have opposite feedback roles, the TE vorticity forcing appears to be dominant in the TE effect on the time-mean flow.
  • [1] SONG Fengfei, and ZHOU Tianjun, 2013: FGOALS-s2 Simulation of Upper-level Jet Streams over East Asia: Mean State Bias and Synoptic-scale Transient Eddy Activity, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 739-753.  doi: 10.1007/s00376-012-2212-7
    [2] Yao HA, Zhong ZHONG, Haikun ZHAO, Yimin ZHU, Yao YAO, Yijia HU, 2022: A Climatological Perspective on Extratropical Synoptic-Scale Transient Eddy Activity Response to Western Pacific Tropical Cyclones, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 333-343.  doi: 10.1007/s00376-021-0375-9
    [3] WANG Lu, and YANG Haijun, 2014: The Role of Atmospheric Teleconnection in the Subtropical Thermal Forcing on the Equatorial Pacific, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 985-994.  doi: 10.1007/s00376-013-3173-1
    [4] Chen SHENG, Bian HE, Guoxiong WU, Yimin LIU, Shaoyu ZHANG, 2022: Interannual Influences of the Surface Potential Vorticity Forcing over the Tibetan Plateau on East Asian Summer Rainfall, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 1050-1061.  doi: 10.1007/s00376-021-1218-4
    [5] Leying ZHANG, Haiming XU, Ning SHI, Jiechun DENG, 2017: Responses of the East Asian Jet Stream to the North Pacific Subtropical Front in Spring, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 144-156.  doi: 10.1007/s00376-016-6026-x
    [6] ZHOU Baiquan, NIU Ruoyun, ZHAI Panmao, 2015: An Assessment of the Predictability of the East Asian Subtropical Westerly Jet Based on TIGGE Data, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 401-412.  doi: 10.1007/s00376-014-4026-2
    [7] GUO Lanli, ZHANG Yaocun, WANG Bin, LI Lijuan, ZHOU Tianjun, BAO Qing, 2008: Simulations of the East Asian Subtropical Westerly Jet by LASG/IAP AGCMs, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 447-457.  doi: 10.1007/s00376-008-0447-0
    [8] KUANG Xueyuan, ZHANG Yaocun, 2005: Seasonal Variation of the East Asian Subtropical Westerly Jet and Its Association with the Heating Field over East Asia, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 831-840.  doi: 10.1007/BF02918683
    [9] Xinyu LI, Riyu LU, Gen LI, 2021: Different Configurations of Interannual Variability of the Western North Pacific Subtropical High and East Asian Westerly Jet in Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 931-942.  doi: 10.1007/s00376-021-0339-0
    [10] Zhang Daizhou, Qin Yu, 1995: QBO-like Oscillations Induced by Local Thermal Forcing, ADVANCES IN ATMOSPHERIC SCIENCES, 12, 245-254.  doi: 10.1007/BF02656837
    [11] CUI Xiaopeng, GAO Shouting, WU Guoxiong, 2003: Up-Sliding Slantwise Vorticity Development and the Complete Vorticity Equation with Mass Forcing, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 825-836.  doi: 10.1007/BF02915408
    [12] Jiapeng MIAO, Tao WANG, Huijun WANG, Yongqi GAO, 2018: Influence of Low-frequency Solar Forcing on the East Asian Winter Monsoon Based on HadCM3 and Observations, ADVANCES IN ATMOSPHERIC SCIENCES, 35, 1205-1215.  doi: 10.1007/s00376-018-7229-0
    [13] Zhang Ren, Yu Zhihao, 2000: Numerical and Dynamical Analyses of Heat Source Forcing and Restricting Subtropical High Activity, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 61-71.  doi: 10.1007/s00376-000-0043-4
    [14] GAO Shouting, ZHOU Yushu, CUI Xiaopeng, DAI Guoping, 2004: Impacts of Cloud-Induced Mass Forcing on the Development of Moist Potential Vorticity Anomaly During Torrential Rains, ADVANCES IN ATMOSPHERIC SCIENCES, 21, 923-927.  doi: 10.1007/BF02915594
    [15] QIAO Fangli, ZHANG Shaoqing, YIN Xunqiang, 2005: Study of Initial Vorticity Forcing for Block Onset by a 4-Dimensional Variational Approach, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 246-259.  doi: 10.1007/BF02918514
    [16] Fukai LIU, Yiyong LUO, Jian LU, Xiuquan WAN, 2021: The Role of Ocean Dynamics in the Cross-equatorial Energy Transport under a Thermal Forcing in the Southern Ocean, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1737-1749.  doi: 10.1007/s00376-021-1099-6
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    • Manuscript History

    Manuscript received: 10 May 2012
    Manuscript revised: 10 May 2012
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    The Effect of Transient Eddy on Interannual Meridional Displacement of Summer East Asian Subtropical Jet

    • 1. Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210093;Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210093
    • Manuscript received: 2012-05-10
    • Manuscript revised: 2012-05-10

    Abstract: Using ERA-40 reanalysis daily data for the period 1958--2002, this study investigated the effect of transient eddy (TE) on the interannual meridional displacement of summer East Asian subtropical jet (EASJ) by conducting a detailed dynamical diagnosis. The summer EASJ axis features a significant interannual coherent meridional displacement. Associated with such a meridional displacement, the TE vorticity forcing anomalies are characterized by a meridional dipole pattern asymmetric about the climatological EASJ axis. The TE vorticity forcing anomalies yield barotropic zonal wind tendencies with a phase meridionally leading the zonal wind anomalies, suggesting that they act to reinforce further meridional displacement of the EASJ and favor a positive feedback in the TE and time-mean flow interaction. However, The TE thermal forcing anomalies induce baroclinic zonal wind tendencies that reduce the vertical shear of zonal wind and atmospheric baroclinicity and eventually suppress the TE activity, favoring a negative feedback in the TE and time-mean flow interaction. Although the two types of TE forcing tend to have opposite feedback roles, the TE vorticity forcing appears to be dominant in the TE effect on the time-mean flow.

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