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Volume 18 Issue 2

Mar.  2001

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2001 >  18(2): 155-165

Sensitivity of the Equatorial Air-Sea Coupled System to theZonal Phase Difference between SST and Wind Stress

  • 1.

    International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA,School of Earth Environment Sciences, Seoul National University, Seoul, 151-742, Korea


doi: 10.1007/s00376-001-0010-8

  • An eigen analysis of the equatorial air-sea coupled model is carried out to understand the mechanism of the slowly varying mode for various zonal phase differences between SST and wind stress. The frequency and growth rate of the slow mode highly depend on the zonal phase difference between SST and wind stress anomalies and the wave scale. For ultra-long waves longer than 20,000 km, the system propagates westward regardless of the position of wind stress. However, for the long waves observed in the Pacific, the slow mode tends to propagate eastward when the SST and wind stress anomalies are close to each other (within a quadrature phase relationship). On the other hand, when the wind stress is located far away from SST, the slow mode tends to propagate westward. The coupled system produces the unstable modes when the westerly (easterly) wind stress is located in the west of warm (cold) SST. It is noted that for the Pacific basin scale,the eastward propagating unstable waves can be produced when the wind stress is located to the west of SST with a few thousand kilometer distance. Also examined in the present study is the relative role of the thermocline displacement and zonal advection effects in determining the propagation and instability of the coupled system.
  • [1] Peter C. Chu, Chen Yuchun, Lu Shihua, 2001: Evaluation of Haney-Type Surface Thermal Boundary Conditions Using a Coupled Atmosphere and Ocean Model, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 355-375.  doi: 10.1007/BF02919315
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    [4] SUN Jilin, Peter CHU, LIU Qinyu, 2006: The Role of the Halted Baroclinic Mode at the Central Equatorial Pacific in El Ni?no Event, ADVANCES IN ATMOSPHERIC SCIENCES, 23, 45-53.  doi: 10.1007/s00376-006-0005-6
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    [6] Chengyang GUAN, Xin WANG, Haijun YANG, 2023: Understanding the Development of the 2018/19 Central Pacific El Niño, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 177-185.  doi: 10.1007/s00376-022-1410-1
    [7] YAN Bangliang, 2005: On the Mechanism of the Locking of the El Ni o Event Onset Phase to Boreal Spring, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 741-750.  doi: 10.1007/BF02918717
    [8] Gao Shiying, Wang Jingshu, Ding Yihui, 1988: THE TRIGGERING EFFECT OF NEAR-EQUATORIAL CYCLONES ON EL NI?O, ADVANCES IN ATMOSPHERIC SCIENCES, 5, 87-96.  doi: 10.1007/BF02657349
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    [12] Shao Yongning, Chen Longxun, 1991: On Quasi-Biennial Oscillation in Air-Sea System, ADVANCES IN ATMOSPHERIC SCIENCES, 8, 11-22.  doi: 10.1007/BF02657361
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    • Manuscript History

    Manuscript received: 10 March 2001
    Manuscript revised: 10 March 2001
    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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    Sensitivity of the Equatorial Air-Sea Coupled System to theZonal Phase Difference between SST and Wind Stress

    • 1. International Pacific Research Center, SOEST, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA,School of Earth Environment Sciences, Seoul National University, Seoul, 151-742, Korea
    • Manuscript received: 2001-03-10
    • Manuscript revised: 2001-03-10

    Abstract: An eigen analysis of the equatorial air-sea coupled model is carried out to understand the mechanism of the slowly varying mode for various zonal phase differences between SST and wind stress. The frequency and growth rate of the slow mode highly depend on the zonal phase difference between SST and wind stress anomalies and the wave scale. For ultra-long waves longer than 20,000 km, the system propagates westward regardless of the position of wind stress. However, for the long waves observed in the Pacific, the slow mode tends to propagate eastward when the SST and wind stress anomalies are close to each other (within a quadrature phase relationship). On the other hand, when the wind stress is located far away from SST, the slow mode tends to propagate westward. The coupled system produces the unstable modes when the westerly (easterly) wind stress is located in the west of warm (cold) SST. It is noted that for the Pacific basin scale,the eastward propagating unstable waves can be produced when the wind stress is located to the west of SST with a few thousand kilometer distance. Also examined in the present study is the relative role of the thermocline displacement and zonal advection effects in determining the propagation and instability of the coupled system.

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