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MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION

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  • The influence of intraseasonal oscillation (ISO) on TC genesis over the northwestern Pacific is studied through comparing analyses of the more and less TC years from 1979 to 2006. It is indicated that the ISO strongly affects the TC genesis. In the years for more TC genesis, the ISO is weak and propagates insignificantly in the area to the west of the Philippines, but the ISO is strong in the area to the east of the Philippines and propagates significantly northwestward. In this situation, the Walker cell shifts gradually westward from the tropical western Pacific to the tropical eastern Indian Ocean. Convergent winds appear in the lower atmosphere while divergent winds in the upper atmosphere, suggesting the presence of enhanced ascending flow over the 140-160°E region and a favorable condition for TC genesis. Moreover, in the years for less TC genesis, the ISO gradually becomes stronger in the area to the west of the Philippines and significant eastward propagation prevails from the eastern Indian Ocean to the area around 120°E; the ISO is weak in the area to the east of the Philippines. During these years, the Walker circulation gradually moved eastward, with convergent winds in the upper troposphere and divergent winds in the lower troposphere. Sinking motion was significant, unfavorable for the TC genesis over the Northwestern Pacific.
  • [1] MADDEN R A, JULIA P R. Detection of a 40-50 dayoscillation in the zonal wind in the tropical Pacific [J]. J. Atmos.Sci., 1971, 28(4): 702-713.
    [2] MADDEN R A, JULIA P R. Description of global scalecirculation cells in the tropics with 40-50 day period [J]. J.Atmos. Sci., 1972, 29(5): 1109-1120.
    [3] LI Chong-yin, PAN Jing. The atmospheric circulation characteristics accompanied with the Asian summer monsoononset [J]. Adv. Atmos. Sci., 2006, 23 (6): 925-939.
    [4] LI Chong-yin, LI Gui-long. Evolution of intraseason aloscillation over the tropical western Pacific/South China Sea and its effect to the summer precipitation in Southern China [J].Advances Atoms. Sci., 1997, 14(2): 246-254.
    [5] LI Chong-yin, ZHOU Ya-ping. Relationship between Intraseasonal oscillation in the tropical atmosphere and ENSO[J]. Chinese J. Geophysics, 1994, 37(3): 213-223.
    [6] ZHANG C, GOTTSCHALCK J. SST anomalies of ENSO and the MJO in the equatorial Pacific [J]. J. Climate, 2002,15(5): 2429-2445.
    [7] GRAY W M. Hurricanes: Their formation, structure, andlikely role in the tropical circulation [M]. Meteorology over the Tropical Oceans, SHAW D B. England: Branknall, 1979:155-218.
    [8] NAKAZAWA T. Intraseasonal variations of OLR in the tropics during the FGGE year [J]. J Meteor Soc Japan, 1986,64(1): 17-34.
    [9] LIEBMANN B, HENDON H H, GLICK J D. The relationship between tropical cyclones of the Western Pacificand Indian Oceans and the Madden-Julian Oscillation [J]. J.Meteor. Soc. Japan, 1994, 72(3): 401-412.
    [10] MALONEY E D, HARTMANN D L. Modulation of Eastern North Pacific Hurricanes by the Madden-Julian Oscillation [J]. J. Climate, 2000, 13(9): 1451-1460.
    [11] SOBEL A H, MALONEY E D. Effect of ENSO and the MJO on Western North Pacific tropical cyclones [J]. Geophys.Res. Lett., 2000, 27(12): 1739-1742.
    [12] HALL J D, MATTHEWS A J, KAROLY D J. Themodulation of tropical cyclone activity in the Australian regionby the Madden-Julian Oscillation [J]. Mon. Wea. Rev., 2001,129(12): 2970-2982.
    [13] BESSAFI M, WHEELER M C. Modulation of south Indian Ocean tropical cyclones by the Madden-Julian Oscillation and convectively coupled equatorial waves [J].Mon. Wea. Rev., 2006, 134(2): 638-656.
    [14] MALONEY E D, HARTMANN D L. Modulation of hurricane activity in the Gulf of Mexico by the Madden-Julian Oscillation [J]. Science, 2000, 287(5460): 2002-2004.
    [15] ZHU Cong-wen, NAKAZAWA T,LI Jian-ping. The influence of atmospheric intraseasonal oscillation on the genesis of tropical depression / cyclone over the Indian Ocean-western Pacific [J]. Acta Meteor. Sinica, 2004, 62(1):42-50. (in Chinese).
    [16] WANG Hui, DING Yi-hui, HE Jin-hai. Influence ofwestern north Pacific summer monsoon change on TC genesis[J]. Acta Meteor. Sin., 2006, 64(3): 345-356. (in Chinese)
    [17] CHEN Lian-shou, DING Yi-hui. A Guidebook to Western Pacific TCs [M]. Beijing: Science Press, 1979: 440. (inChinese)
    [18] CHEN Lian-shou, XU Xian-de, LUO Zhe-xian, et al., A Guidebook to Tropical Cyclone Dynamics [M]. Beijing: China Meteorological Press, 2002: 317. (in Chinese)
    [19] WANG Yong-mei, LI Wei-jing, REN Fu-min, et al. Studyon climatic characteristics of China-influencing TCs and the interrelations between them and their environmental factors [J].J. Trop. Meteor., 23(6): 538-544. (in Chinese)
    [20] WANG B, XIE X. A model for the boreal summerintraseasonal oscillation [J]. J. Atmos. Sci., 1997, 54(1): 72-86.
    [21] YASUNARI T. Cloudiness fluctuations associated with the Northern Hemisphere summer monsoon [J]. J. Meteor. Soc.Japan, 1979, 57(3): 227-242.
    [22] KRISHNAMURTI T N, SUBRAHMANYAM D. The30~50 day mode at 850mb during MONEX [J]. J. Atmos. Sci.,1982, 39(9): 2088-2095.
    [23] CHEN T C, MURAKAMI M. The 30~50 day variationof convective activity over the western Pacific Ocean with the emphasis on the northwestern region [J]. Mon. Wea. Rev.,1988, 166(4): 892-906.
    [24] LONG Zhen-xia, LI Chong-yin. Interannual variation of tropical atmospheric 30-60 day low-frequency oscillation and ENSO cycle [J]. Chin. J. Atmos. Sci., 2002, 26(1): 51-62.
    [25] LI Chong-yin, LONG Zhen-xia, ZHANG Qing-yun.Strong/weak summer monsoon activity over the South China Sea and atmospheric intraseasonal oscillation [J]. Adv. Atmos.Sci., 2001, 18(6): 1147-1160.
    [26] TENG Hui-yan, WANG Bin. Interannual variations of theboreal summer intraseasonal oscillation in the Asian-Pacificregion [J]. J. Climate, 2003, 16(22): 3572-3584.
    [27] DONG Min, ZHANG Xin-qiang, HE Jing-hai. Adiagnosis study on the time-spatial characteristics of tropical intraseasonal oscillation [J]. Acta Meteor. Sin., 2004, 62(6):821-830. (in Chinese)
    [28] LI Chong-yin. Actions of summer monsoon troughs(ridges) and tropical cyclones over south Asia and the moving CISK mode [J]. Sci. China, 1985, 28: 1197-1207.
    [29] HUANG Rong-hui, CHEN Guang-hua. Interannual variability and mechanism of tropical cyclone with the track tothe east over the northwestern Pacific [J]. Acta Meteor. Sinica,2007, 65(5): 683-694. (in Chinese)

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TIAN Hua, LI Chong-yin, YANG Hui. MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION [J]. Journal of Tropical Meteorology, 2012, 18(1): 11-20.
TIAN Hua, LI Chong-yin, YANG Hui. MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION [J]. Journal of Tropical Meteorology, 2012, 18(1): 11-20.
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Manuscript received: 05 November 2010
Manuscript revised: 22 December 2011
通讯作者: 陈斌, bchen63@163.com
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MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION

Abstract: The influence of intraseasonal oscillation (ISO) on TC genesis over the northwestern Pacific is studied through comparing analyses of the more and less TC years from 1979 to 2006. It is indicated that the ISO strongly affects the TC genesis. In the years for more TC genesis, the ISO is weak and propagates insignificantly in the area to the west of the Philippines, but the ISO is strong in the area to the east of the Philippines and propagates significantly northwestward. In this situation, the Walker cell shifts gradually westward from the tropical western Pacific to the tropical eastern Indian Ocean. Convergent winds appear in the lower atmosphere while divergent winds in the upper atmosphere, suggesting the presence of enhanced ascending flow over the 140-160°E region and a favorable condition for TC genesis. Moreover, in the years for less TC genesis, the ISO gradually becomes stronger in the area to the west of the Philippines and significant eastward propagation prevails from the eastern Indian Ocean to the area around 120°E; the ISO is weak in the area to the east of the Philippines. During these years, the Walker circulation gradually moved eastward, with convergent winds in the upper troposphere and divergent winds in the lower troposphere. Sinking motion was significant, unfavorable for the TC genesis over the Northwestern Pacific.

TIAN Hua, LI Chong-yin, YANG Hui. MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION [J]. Journal of Tropical Meteorology, 2012, 18(1): 11-20.
Citation: TIAN Hua, LI Chong-yin, YANG Hui. MODULATION OF TC GENESIS OVER THE NORTHWESTERN PACIFIC BY ATMOSPHERIC INTRASEASONAL OSCILLATION [J]. Journal of Tropical Meteorology, 2012, 18(1): 11-20.
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