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Volume 22 Issue 3

May  2005

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2005 >  22(3): 451-462

On the Mechanism of the Seasonal Variability of SST in the Tropical Indian Ocean

  • 1.

    Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,CSIRO, Division of Marine Research, GPO Box 1538, Hobart, Tasmania, Australia


doi: 10.1007/BF02918758

  • A general form of an equation that "explicitly" diagnoses SST change is derived. All other equations in wide use are its special case. Combining with the data from an ocean general circulation model (MOM2)with an integration of 10 years (1987-1996), the relative importances of various processes that determine seasonal variations of SST in the tropical Indian Ocean are compared mainly for January, April, July and October. The main results are as follows. (1) The net surface heat flux is the most important factor affecting SST over the Arabian Sea, the Bay of Bengal and the region south of the equator in January; in April, its influence covers almost the whole region studied; whereas in July and October, this term shows significance only in the regions south of 10°S and north of the equator, respectively. (2) The horizontal advection dominates in the East African-Arabian coast and the region around the equator in January and July; in October, the region is located south of 10°S. (3) The entrainment is significant only in a narrow band centered on 10°S in April and the coastal region around the Arabian Sea and the equator in July. (4)As for SST, it decreases in January and July but increases in April and October in the Arabian Sea and the Bay of Bengal, showing a (asymmetrical) semiannual variability; by contrast, the SST in the region south of the equator has an annual variability, decreasing in April and July and increasing in October and January.
  • [1] LI Shuanglin, CHEN Xiaoting, 2014: Quantifying the Response Strength of the Southern Stratospheric Polar Vortex to Indian Ocean Warming in Austral Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 492-503.  doi: 10.1007/s00376-013-2322-x
    [2] CAO Jie, LU Riyu, HU Jinming, WANG Hai, 2013: Spring Indian Ocean-Western Pacific SST Contrast and the East Asian Summer Rainfall Anomaly, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 1560-1568.  doi: 10.1007/s00376-013-2298-6
    [3] ZHANG Dingyuan, LIAO Hong, WANG Yuesi, 2014: Simulated Spatial Distribution and Seasonal Variation of Atmospheric Methane over China: Contributions from Key Sources, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 283-292.  doi: 10.1007/s00376-013-3018-y
    [4] Yujie WU, Wansuo DUAN, 2018: Impact of SST Anomaly Events over the Kuroshio-Oyashio Extension on the "Summer Prediction Barrier", ADVANCES IN ATMOSPHERIC SCIENCES, 35, 397-409.  doi: 10.1007/s00376-017-6322-0
    [5] Ben TIAN, Hong-Li REN, 2022: Diagnosing SST Error Growth during ENSO Developing Phase in the BCC_CSM1.1(m) Prediction System, ADVANCES IN ATMOSPHERIC SCIENCES, 39, 427-442.  doi: 10.1007/s00376-021-1189-5
    [6] Peng Yongqing, Yan Shaojin, 1994: Seasonal Variation Features of Western North Pacific Tropical Cyclone Tracks with Their Predictability, ADVANCES IN ATMOSPHERIC SCIENCES, 11, 463-469.  doi: 10.1007/BF02658167
    [7] LIU Juan, WANG Bin, LIU Hailong, YU Yongqiang, 2008: A New Global Four-Dimensional Variational Ocean Data Assimilation System and Its Application, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 680-691.  doi: 10.1007/s00376-008-0680-6
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    [10] Qian ZHOU, Wansuo DUAN, Xu WANG, Xiang LI, Ziqing ZU, 2021: The Initial Errors in the Tropical Indian Ocean that Can Induce a Significant “Spring Predictability Barrier” for La Niña Events and Their Implication for Targeted Observations, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1566-1579.  doi: 10.1007/s00376-021-0427-1
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    [12] HU Kaiming, HUANG Gang, QU Xia, HUANG Ronghui, 2012: The Impact of Indian Ocean Variability on High Temperature Extremes across the Southern Yangtze River Valley in Late Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 91-100.  doi: 10.1007/s00376-011-0209-2
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    • Manuscript History

    Manuscript received: 10 May 2005
    Manuscript revised: 10 May 2005
    通讯作者: 陈斌, bchen63@163.com
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    On the Mechanism of the Seasonal Variability of SST in the Tropical Indian Ocean

    • 1. Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China, Qingdao 266003,CSIRO, Division of Marine Research, GPO Box 1538, Hobart, Tasmania, Australia
    • Manuscript received: 2005-05-10
    • Manuscript revised: 2005-05-10

    Abstract: A general form of an equation that "explicitly" diagnoses SST change is derived. All other equations in wide use are its special case. Combining with the data from an ocean general circulation model (MOM2)with an integration of 10 years (1987-1996), the relative importances of various processes that determine seasonal variations of SST in the tropical Indian Ocean are compared mainly for January, April, July and October. The main results are as follows. (1) The net surface heat flux is the most important factor affecting SST over the Arabian Sea, the Bay of Bengal and the region south of the equator in January; in April, its influence covers almost the whole region studied; whereas in July and October, this term shows significance only in the regions south of 10°S and north of the equator, respectively. (2) The horizontal advection dominates in the East African-Arabian coast and the region around the equator in January and July; in October, the region is located south of 10°S. (3) The entrainment is significant only in a narrow band centered on 10°S in April and the coastal region around the Arabian Sea and the equator in July. (4)As for SST, it decreases in January and July but increases in April and October in the Arabian Sea and the Bay of Bengal, showing a (asymmetrical) semiannual variability; by contrast, the SST in the region south of the equator has an annual variability, decreasing in April and July and increasing in October and January.

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