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Article >  Journal of Tropical Meteorology  > 2011 >  17(3): 202-208

Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations

  • Guangzhou Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon, China Meteorological Administration

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  • Since the South China Sea (SCS) summer monsoon (SCSSM) is pronouncedly featured by abruptly intensified southwesterly and obviously increased precipitation over the SCS, the lower-tropospheric winds and/or convection intensities are widely used to determine the SCSSM onset. The methods can be used successfully in most of the years but not in 2006. Due to the intrusion of Typhoon Chanchu (0601) that year, the usual method of determining SCSSM onset date by utilizing the SCS regional indices is less capable of pinpointing the real onset date. In order to solve the problem, larger-scale situations have to be taken into account. Zonal and meridional circulations would be better to determine the break-out date of SCSSM in 2006. The result indicates that its onset date is May 16. Moreover, similar onset dates for other years can be obtained using various methods, implying that large-scale zonal and meridional circulations can be used as an alternative method for determining the SCSSM onset date.
  • [1] GAO Hui, LIANG Jian-yin. Definition of South China Seasummer monsoon's onset date and East Asian summermonsoon's index [J]. J. Trop. Meteor., 2005, 21(5): 525-532.
    [2] LIANG Jian-yin, WU Shang-sen. A Study of SouthwestMonsoon onset date over the South China Sea and its impactfactors [J]. Chin. J. Atmos. Sci., 2002, 26(6): 829-844.
    [3] LAM Kin-hang, WANG An-yu, FONG Soi-kun, et al. Theclimatic characteristics of maintaining period of South ChinaSea summer monsoon Ⅰ―40 yearly average [J]. J. Trop.Meteor., 2005, 21(2): 113-122.
    [4] HE You-hai, PENG Chu-ming, GUAN Cui-hua, et al.Interannual variations of the onset of the South China Seasummer monsoon and low-frequency oscillation of convectiveactivities in the atmosphere [J]. Chin. J. Atmos. Sci., 2000,24(6): 785-794.
    [5] LI Chong-yin, QU Xin. Large scale atmospheric circulationevolutions associated with summer monsoon onset in the SouthChina Sea [J]. Chin. J. Atmos. Sci., 2000, 24(1): 1-14.
    [6] XIE An, DAI Nian-jun. Preliminary opinions on the onsetdate and strength of the South China Sea summer monsoon[A]// HE Jin-hai, DING Yi-hui, GAO Hui, et al. Determinationof the date of the South China Sea summer monsoon onset andmonsoon index [M]. Beijing: China Meteorological Press, 2001:67-70.
    [7] ZHANG Xiu-zhi, LI Jiang-long, YAN Jun-yue, et al. Astudy of circulation characteristics and index of the SouthChina Sea summer monsoon [A]// He Jin-hai, Ding Yi-hui, GaoHui, et al. Determination of the date of the South China Seasummer monsoon onset and monsoon index [M]. Beijing:China Meteorological Press, 2001: 83-95.
    [8] YAO Yong-hong, QIAN Yong-fu. A Study on the SouthChina Sea monsoon index and the relationship between theindex and regional rainfalls of China [J]. J. Nanjing Univ. (Nat.Sci.), 2001, 37(6): 781-788.
    [9] YAN Jun-yue, TANG Zhi-yi, YAO Hua-dong, et al. A studyon the air-sea fluxes exchange coefficients over the SouthChina Sea (SCS) during the onset of Southwest Monsoon [J].Acta Meteor. Sinica, 2006, 64(3): 335-344.
    [10] DENG Xue-jiao, LI Chun-hui, BI Xue-yan, et al. Land-airheat exchange and thermal boundary layer structure before andafter the establishment of South China Sea monsoon over PearlRiver Delta [J]. Acta Meteor. Sinica, 2007, 65(2): 280-292.
    [11] ZENG Qiang, ZHANG Yao-cun. An analysis of SSTvariation during South China Sea monsoon onset period inSouth China Sea [J]. J. Trop. Meteor., 2008, 24(1): 44-50.
    [12] LIANG Jian-yin, LI Chun-hui, WU Shang-sen. A reviewof activities of summer southwest monsoon over China in 2003[J]. Meteor. Mon., 2004, 30(8): 8-12.
    [13] HE Min, XU Li, SONG Wen-ling. Short range climateprediction of the onset and intensity of South China Seasummer monsoon [J]. Meteor. Mon., 2002, 28(10): 9-14.
    [14] YANG Yan, WEN Zhi-ping, YUAN Zhuo-jian, et al. Thecomparison between the mechanism of the onset of the strong(1994) and weak (1998) South China Sea summer monsoon [J].J. Trop. Meteor., 2005, 21(1): 1-12.
    [15] ZHANG Xiu-zhi, LI Jiang-long, DING Yi-hui, et al. Astudy of circulation characteristics and index of South ChinaSea summer monsoon [J]. Acta Meteor. Sinica, 2001, 15(4):450-464.
    [16] FONG Soi-kun, Wang An-yu, Wu Chi-sheng, et al. Onsetdate of South China Sea summer monsoon [A]// HE Jin-hai,DING Yi-hui, GAO hui, et al. Determination of the date of theSouth China Sea summer monsoon onset and monsoon index[M]. Beijing: China Meteorological Press, 2001: 77.
    [17] HE Jin-hai, DING Yi-hui, GAO hui, et al. Determinationof the Date of the South China Sea Summer Monsoon Onsetand Monsoon Index [M]. Beijing: China Meteorological Press,2001: 123.
    [18] National Climate Center, China MeteorologicalAdministration. Report on the South China Sea SummerMonsoon Onset Monitoring in May, 2006 [EB/ON] [200912-25]http://www.monsoon.gov.cn.
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ZHENG Bin, LIN Ai-lan, GU De-jun, et al. Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations [J]. Journal of Tropical Meteorology, 2011, 17(3): 202-208.
ZHENG Bin, LIN Ai-lan, GU De-jun, et al. Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations [J]. Journal of Tropical Meteorology, 2011, 17(3): 202-208.
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    Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations

    • Guangzhou Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon, China Meteorological Administration

    Abstract: Since the South China Sea (SCS) summer monsoon (SCSSM) is pronouncedly featured by abruptly intensified southwesterly and obviously increased precipitation over the SCS, the lower-tropospheric winds and/or convection intensities are widely used to determine the SCSSM onset. The methods can be used successfully in most of the years but not in 2006. Due to the intrusion of Typhoon Chanchu (0601) that year, the usual method of determining SCSSM onset date by utilizing the SCS regional indices is less capable of pinpointing the real onset date. In order to solve the problem, larger-scale situations have to be taken into account. Zonal and meridional circulations would be better to determine the break-out date of SCSSM in 2006. The result indicates that its onset date is May 16. Moreover, similar onset dates for other years can be obtained using various methods, implying that large-scale zonal and meridional circulations can be used as an alternative method for determining the SCSSM onset date.

    ZHENG Bin, LIN Ai-lan, GU De-jun, et al. Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations [J]. Journal of Tropical Meteorology, 2011, 17(3): 202-208.
    Citation: ZHENG Bin, LIN Ai-lan, GU De-jun, et al. Determination of onset date of the South China Sea summer monsoon in 2006 using large-scale circulations [J]. Journal of Tropical Meteorology, 2011, 17(3): 202-208.
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