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Volume 23 Issue 1

Jan.  2006

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2006 >  23(1): 156-164

A Further Investigation of the Decadal Variation of ENSO Characteristics with Instability Analysis

  • 1.

    Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003


doi: 10.1007/s00376-006-0016-3

  • Based on instability theory and some former studies, the Simple Ocean Data Assimilation (SODA) data are analyzed to further study the difference between the propagation of the ENSO-related oceanic anomaly in the off-equatorial North Pacific Ocean before and after 1976. The investigation shows that after 1976 in the off-equatorial North Pacific Ocean, there is a larger area where the necessary conditions for baroclinic and/or barotropic instability are satisfied, which may help oceanic anomaly signals propagating in the form of Rossby waves to absorb energy from the mean currents so that they can grow and intensify. The baroclinic energy conversion rate in the North Pacific after 1976 is much higher than before 1976, which indicates that the baroclinic instability has intensified since 1976. From another perspective, the instability analysis gives an explanation of the phenomena that the ENSO-related oceanic anomaly signal in the North Pacific has intensified since 1976.
  • [1] Yuan-Bing ZHAO, X. San LIANG, 2019: Charney's Model——the Renowned Prototype of Baroclinic Instability——Is Barotropically Unstable As Well, ADVANCES IN ATMOSPHERIC SCIENCES, , 733-752.  doi: 10.1007/s00376-019-8189-8
    [2] Zhou Tianjun, Yu Rucong, Li Zhaoxin, 2002: ENSO-Dependent and ENSO-Independent Variability over the Mid-Latitude North Pacific: Observation and Air-Sea Coupled Model Simulation, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 1127-1147.  doi: 10.1007/s00376-002-0070-4
    [3] Xiaofei WU, Jiangyu MAO, 2019: Decadal Changes in Interannual Dependence of the Bay of Bengal Summer Monsoon Onset on ENSO Modulated by the Pacific Decadal Oscillation, ADVANCES IN ATMOSPHERIC SCIENCES, 36, 1404-1416.  doi: 10.1007/s00376-019-9043-8
    [4] Renping LIN, Fei ZHENG, Xiao DONG, 2018: ENSO Frequency Asymmetry and the Pacific Decadal Oscillation in Observations and 19 CMIP5 Models, ADVANCES IN ATMOSPHERIC SCIENCES, 35, 495-506.  doi: 10.1007/s00376-017-7133-z
    [5] Jie JIANG, Yuqing WANG, 2022: The Roles of Barotropic Instability and the Beta Effect in the Eyewall Evolution of Tropical Cyclones, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 1800-1815.  doi: 10.1007/s00376-021-1209-5
    [6] Ki-Young HEO, Kyung-Ja HA, 2008: Snowstorm over the Southwestern Coast of the Korean Peninsula Associated with the Development of Mesocyclone over the Yellow Sea, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 765-777.  doi: 10.1007/s00376-008-0765-2
    [7] Yaokun LI, Jiping CHAO, Yanyan KANG, 2022: Variations in Amplitudes and Wave Energy along the Energy Dispersion Paths for Rossby Waves in the Quasigeostrophic Barotropic Model, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 876-888.  doi: 10.1007/s00376-021-1244-2
    [8] Xiang Jie, Sun Litan, 2002: Nonlinear Saturation of Baroclinic Instability in the Phillips Model: The Case of Energy, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 1079-1090.  doi: 10.1007/s00376-002-0066-0
    [9] Luo Dehai, 1999: Nonlinear Three-Wave Interaction among Barotropic Rossby Waves in a Large-scale Forced Barotropic Flow, ADVANCES IN ATMOSPHERIC SCIENCES, 16, 451-466.  doi: 10.1007/s00376-999-0023-2
    [10] Xinyi XING, Xianghui FANG, Da PANG, Chaopeng JI, 2024: Seasonal Variation of the Sea Surface Temperature Growth Rate of ENSO, ADVANCES IN ATMOSPHERIC SCIENCES, 41, 465-477.  doi: 10.1007/s00376-023-3005-x
    [11] LI Gang*, LI Chongyin, TAN Yanke, and BAI Tao, 2014: The Interdecadal Changes of South Pacific Sea Surface Temperature in the Mid-1990s and Their Connections with ENSO, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 66-84.  doi: 10.1007/s00376-013-2280-3
    [12] Wu Renguang, Chen Lieting, 1998: Decadal Variation of Summer Rainfall in the Yangtze-Huaihe River Valley and Its Relationship to Atmospheric Circulation Anomalies over East Asia and Western North Pacific, ADVANCES IN ATMOSPHERIC SCIENCES, 15, 510-522.  doi: 10.1007/s00376-998-0028-2
    [13] KANG Xianbiao, HUANG Ronghui, WANG Zhanggui, ZHANG Rong-Hua, 2014: Sensitivity of ENSO Variability to Pacific Freshwater Flux Adjustment in the Community Earth System Model, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 1009-1021.  doi: 10.1007/s00376-014-3232-2
    [14] JIANG Yuxin, TAN Benkui, 2015: Two Modes and Their Seasonal and Interannual Variation of the Baroclinic Waves/Storm Tracks over the Wintertime North Pacific, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 1244-1254.  doi: 10.1007/s00376-015-4251-3
    [15] Wang Huijun, 2002: The Instability of the East Asian Summer Monsoom-ENSO Relations, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 1-11.  doi: 10.1007/s00376-002-0029-5
    [16] Kaiming HU, Yingxue LIU, Gang HUANG, Zhuoqi HE, Shang-Min LONG, 2020: Contributions to the Interannual Summer Rainfall Variability in the Mountainous Area of Central China and Their Decadal Changes, ADVANCES IN ATMOSPHERIC SCIENCES, 37, 259-268.  doi: 10.1007/s00376-019-9099-5
    [17] Xiaoxuan ZHAO, Riyu LU, 2020: Vertical Structure of Interannual Variability in Cross-Equatorial Flows over the Maritime Continent and Indian Ocean in Boreal Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 37, 173-186.  doi: 10.1007/s00376-019-9103-0
    [18] Yang AI, Ning JIANG, Weihong QIAN, Jeremy Cheuk-Hin LEUNG, Yanying CHEN, 2022: Strengthened Regulation of the Onset of the South China Sea Summer Monsoon by the Northwest Indian Ocean Warming in the Past Decade, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 943-952.  doi: 10.1007/s00376-021-1364-8
    [19] ZHENG Fei, ZHANG Rong-Hua, ZHU Jiang, , 2014: Effects of Interannual Salinity Variability on the Barrier Layer in the Western-Central Equatorial Pacific: A Diagnostic Analysis from Argo, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 532-542.  doi: 10.1007/s00376-013-3061-8
    [20] Weijie FENG, Marco Y.-T. LEUNG, Dongxiao WANG, Wen ZHOU, Oscar Y. W. ZHANG, 2022: An Extreme Drought over South China in 2020/21 Concurrent with an Unprecedented Warm Northwest Pacific and La Niña, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 1637-1649.  doi: 10.1007/s00376-022-1456-0
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    • Manuscript History

    Manuscript received: 10 January 2006
    Manuscript revised: 10 January 2006
    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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    A Further Investigation of the Decadal Variation of ENSO Characteristics with Instability Analysis

    • 1. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003
    • Manuscript received: 2006-01-10
    • Manuscript revised: 2006-01-10

    Abstract: Based on instability theory and some former studies, the Simple Ocean Data Assimilation (SODA) data are analyzed to further study the difference between the propagation of the ENSO-related oceanic anomaly in the off-equatorial North Pacific Ocean before and after 1976. The investigation shows that after 1976 in the off-equatorial North Pacific Ocean, there is a larger area where the necessary conditions for baroclinic and/or barotropic instability are satisfied, which may help oceanic anomaly signals propagating in the form of Rossby waves to absorb energy from the mean currents so that they can grow and intensify. The baroclinic energy conversion rate in the North Pacific after 1976 is much higher than before 1976, which indicates that the baroclinic instability has intensified since 1976. From another perspective, the instability analysis gives an explanation of the phenomena that the ENSO-related oceanic anomaly signal in the North Pacific has intensified since 1976.

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