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Volume 18 Issue 5

Sep.  2001

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2001 >  18(5): 1018-1028

Possible Influences of ITCZ in Asian Monsoon Regions on Rainy Season Anomaly of North China

  • 1.

    Shandong Meteorological Institute, Jtnan 250031,Department of Geophysics, Beijing University, Beijing 100871

  • Vast convective activities over tropical zones are analyzed for both wet and dry summers in North China. An ITCZ synthesis index is designed using OLR data. The index can demonstrate quite clearly and objectively the seasonal featurea of deep convection in Asia monsoon areas. The differences of ITCZ activi ties in Indian as well as East Asian monsoon regions in winter-spring period are significant and so is the time-lagged correlation, which would be able to provide a new way to the long-lead prediction of summer rain in North China. The propagation characters of low frequency fluctuation are also different between wet and dry years. The intensity of low frequency fluctuation is stronger and the area is larger in wet years than that in dry years in both hemispheres. The fluctuation moves from south to north successively in wet years, which may lead to the leap of the subtropical high northwards, while it remains quasi-stationary in the Southern Hemisphere or the equatorial zone in dry years.
  • [1] Fei WANG, Lifang SHENG, Xiadong AN, Qian LIU, Haixia ZHOU, Yingying ZHANG, Jianping LI, 2021: Controls on the Northward Movement of the ITCZ over the South China Sea in Autumn: A Heavy Rain Case Study, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1651-1664.  doi: 10.1007/s00376-021-0445-z
    [2] WU Fanghua, LIN Pengfei, LIU Hailong, 2012: Influence of a Southern Shift of the ITCZ from Quick Scatterometer Data on the Pacific North Equatorial Countercurrent, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 1292-1304.  doi: 10.1007/s00376-012-1149-1
    [3] Shiyan ZHANG, Yongyun HU, Jiankai ZHANG, Yan XIA, 2024: Attribution of Biases of Interhemispheric Temperature Contrast in CMIP6 Models, ADVANCES IN ATMOSPHERIC SCIENCES, 41, 325-340.  doi: 10.1007/s00376-023-3002-0
    [4] Jiang Shangcheng, Ye Qian, Yang Xifeng, An Gang, Xiangqiang Wu, 2000: Climatological Features of the Global Tropical Subsidence Region Based on Satellite Observations, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 391-402.  doi: 10.1007/s00376-000-0031-8
    [5] Zhao Ping, Chen Longxun, 2001: Interannual Variability of Atmospheric Heat Source/Sink over the Qinghai-Xizang (Tibetan) Plateau and its Relation to Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 106-116.  doi: 10.1007/s00376-001-0007-3
    [6] Angkool WANGWONGCHAI, ZHAO Sixiong, ZENG Qingcun, 2010: An Analysis of Typhoon Chanthu in June 2004 with Focus on the Impact on Thailand, ADVANCES IN ATMOSPHERIC SCIENCES, 27, 14-32.  doi: 10.1007/s00376-009-8206-4
    [7] WANG Bin, XIE Xin, LI Lijuan, 2009: A Review on Aspects of Climate Simulation Assessment, ADVANCES IN ATMOSPHERIC SCIENCES, 26, 736-747.  doi: 10.1007/s00376-009-9038-y
    [8] DAI Fushan, YU Rucong, ZHANG Xuehong, YU Yongqiang, LI Jianglong, 2003: The Impact of Low-Level Cloud over the Eastern Subtropical Pacific on the "Double ITCZ" in LASG FGCM-0, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 461-474.  doi: 10.1007/BF02690804
    [9] DAI Fushan, YU Rucong, ZHANG Xuehong, YU Yongqiang, LI Jianglong, 2005: Impacts of an Improved Low-Level Cloud Scheme on the Eastern Pacific ITCZ-Cold Tongue Complex, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 559-574.  doi: 10.1007/BF02918488
    [10] ZHOU Wen, Johnny Chung-Leung CHAN, LI Chongyin, 2005: South China Sea Summer Monsoon Onset in Relation to the Off-Equatorial ITCZ, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 665-676.  doi: 10.1007/BF02918710
    [11] FAN Ke, WANG Huijun, 2007: Dust Storms in North China in 2002: A Case Study of the Low Frequency Oscillation, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 15-23.  doi: 10.1007/s00376-007-0015-z
    [12] CAO Xi, HUANG Ping, CHEN Guanghua, CHEN Wen, 2012: Modulation of Western North Pacific Tropical Cyclone Genesis by Intraseasonal Oscillation of the ITCZ: A Statistical Analysis, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 744-754.  doi: 10.1007/s00376-012-1121-0
    [13] LI Yuefeng, 2007: Conversion of Kinetic Energy from Synoptic Scale Disturbance to Low-Frequency Fluctuation over the Yangtze River Valley in the Summers of 1997 and 1999, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 591-598.  doi: 10.1007/s00376-007-0591-y
    [14] D.R. Chakraborty, N.K. Agarwal, 1996: Role of Triad Kinetic Energy Interactions for Maintenance of Upper Tropospheric Low Frequency Waves during Summer Monsoon 1988, ADVANCES IN ATMOSPHERIC SCIENCES, 13, 91-102.  doi: 10.1007/BF02657030
    [15] Zheng Weizhong, Ni Yunqi, 1999: A Numerical Experiment Study for Effects of the Grassland Desertification on Summer Drought in North China, ADVANCES IN ATMOSPHERIC SCIENCES, 16, 251-262.  doi: 10.1007/BF02973086
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    [17] LI Jianglong, ZHANG Xuehong, YU Yongqiang, DAI Fushan, 2004: Primary Reasoning behind the Double ITCZ Phenomenon in a Coupled Ocean-Atmosphere General Circulation Model, ADVANCES IN ATMOSPHERIC SCIENCES, 21, 857-867.  doi: 10.1007/BF02915588
    [18] FuZuntao, Zhao Qiang, QiaoFangli, Liu Shikuo, 2000: Response of Atmospheric Low-frequency Wave to Oceanic Forcing in the Tropics, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 569-575.  doi: 10.1007/s00376-000-0020-y
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    [20] HE Jinhai, YU Jingjing, SHEN Xinyong, 2007: Impacts of SST and SST Anomalies on Low-Frequency Oscillation in the Tropical Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 377-382.  doi: 10.1007/s00376-007-0377-2
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    • Manuscript History

    Manuscript received: 10 September 2001
    Manuscript revised: 10 September 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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    Possible Influences of ITCZ in Asian Monsoon Regions on Rainy Season Anomaly of North China

    • 1. Shandong Meteorological Institute, Jtnan 250031,Department of Geophysics, Beijing University, Beijing 100871
    • Manuscript received: 2001-09-10
    • Manuscript revised: 2001-09-10

    Abstract: Vast convective activities over tropical zones are analyzed for both wet and dry summers in North China. An ITCZ synthesis index is designed using OLR data. The index can demonstrate quite clearly and objectively the seasonal featurea of deep convection in Asia monsoon areas. The differences of ITCZ activi ties in Indian as well as East Asian monsoon regions in winter-spring period are significant and so is the time-lagged correlation, which would be able to provide a new way to the long-lead prediction of summer rain in North China. The propagation characters of low frequency fluctuation are also different between wet and dry years. The intensity of low frequency fluctuation is stronger and the area is larger in wet years than that in dry years in both hemispheres. The fluctuation moves from south to north successively in wet years, which may lead to the leap of the subtropical high northwards, while it remains quasi-stationary in the Southern Hemisphere or the equatorial zone in dry years.

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