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Lü Junmei, Zhang Qingyun, Tao Shiyan, et al. Contrast analysis on atmospheric circulation and heat source anomalies in strong and weak years of East Asian summer monsoon. J Appl Meteor Sci, 2007, 18(4): 442-451. .
Citation: Lü Junmei, Zhang Qingyun, Tao Shiyan, et al. Contrast analysis on atmospheric circulation and heat source anomalies in strong and weak years of East Asian summer monsoon. J Appl Meteor Sci, 2007, 18(4): 442-451. .
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Contrast Analysis on Atmospheric Circulation and Heat Source Anomalies in Strong and Weak Years of East Asian Summer Monsoon

  • 1.

    State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

  • 2.

    Chinese Academy of Meteorological Sciences, Beijing 100081

  • 3.

    China Meteorological Administration Training Center, Beijing 100081

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    Abstract
  • Based on East Asian summer monsoon (EASM) index defined by Huang Gang et al., the differences of atmospheric circulation, atmospheric heat source and external forcing (i. e., SST) between strong and weak monsoon years are discussed.It is found that SSTA in Pacific appears La Niña pattern in winter preceding a strong EASM until the summer. That is to say, the SST in the equatorial central and eastern Pacific is low, while that in the Western Pacific Warm Pool is high.The convective activities over the equatorial eastern Indian Ocean, Sumatra and Warm Pool become obviously stronger than weak monsoon years.Meanwhile the atmosphere over South Asia, extending from the Indian subcontinent, through the southern part of the Tibetan Plateau, the Indochina Peninsula to South China, is abnormally heated.Furthermore, the analysis of mean tropospheric temperature anomalies shows that the heat contrasts between sea and land intensify.It is advantageous for the occurrences of strong EASM.In addition, the ascendant flow near Warm Pool is strong because of the active convection.So the Walker circulation becomes intense. The Asian subtropical westerly jet and subtropical high are located northward while the strong EASM advances northward.North China is located at the south side of the Asian subtropical westerly jet during July and August.So the precipitation over North China is abundant.Another rain belt is located at South China.But the precipitation over the Yangtze and Huaihe River Basins is short.On the other hand, winter SSTA in Pacific shows El Niño pattern preceding a weak EASM.The SST in the equatorial central and eastern Pacific and tropical Indian Ocean is high whereas that in the Warm Pool stretching through northwestern Pacific is low.This SSTA pattern lasts until the summer.As a result, the convective activity near Warm Pool becomes weak.Moreover, from April to July the atmosphere over the equatorial central and eastern Pacific is abnormally heated.But the atmosphere over South Asia, extending from the Indian subcontinent to South China, is cold.At the same time, the land-sea thermal difference between Asian land and the ocean weakens.It means a weak EASM.The center of convection activity shifts eastward into the central Pacific.Accordingly the Walker circulation becomes subdued.The ascendant flow over Indochina Peninsula and Philippine is weak.The Asian subtropical westerly jet and subtropical high are located southward while the weak EASM advances northward.The Yangtze and Huaihe River Basins are located at the south side of the Asian subtropical westerly jet during July and August, the precipitation over this region is abundant.Also, the physical scenario of atmosphere and SST anomalies associated with the interannual variability of the EASM are given.
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    • References (19)

  • Fig  1.   The composite meridian-altitude sections of wind through 105°—125°E in April (a), June (b), July (c) and August (d) for strong East Asian summer monsoon years

    (the components of vectors are meridional wind, unit: m·s-1, vertical velocity, unit : 10-4 hPa·s-1; the contours refer to zonal wind, unit : m·s-1; shaded area indicates zonal wind exceeding 5 m·s-1; the vertical thick dashed line represents the axes of westerly flow; the thick solid line denotes the mean precipitation averaged between 105°E and 125°E, unit : mm·d-1)

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    Fig  2.   Same as in Fig. 1, but for East Asian summer monsoon weak years

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    Fig  3.   The difference of OLR (unit : W·m-2) between the strong and weak years of East Asian summer monsoon in April (a), May (c), June (c), July (d) and August (e)

    (regions over 90% confidence level are shaded)

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    Fig  4.   The composites of mean tropospheric temperature anomalies averaged from 850 hPa to 200 hPa for weak (a) and strong (b) years of East Asian summer monsoon

    (unit : ℃; regions over 90% confidence level are shaded)

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    Fig  5.   The composites of Q1 anomalies (unit:W·m-2) integ rated vertically from surface to 100 hPa in April (a), May (b), June (c) and July (d) for strong years of East Asian summer monsoon

    (regions over 95% confidence level are shaded)

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    Fig  6.   Same as in Fig. 5, but for East Asian summer monsoon in weak years

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    Fig  7.   The composites of preceding winter SST anomalies (unit : ℃) in weak (a) and strong (b) years of East Asian summer monsoon

    (regions over 90% confidence level are shaded)

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  • Meehl G.The annual cycle and interannual variability in the tropical Pacific andIndian Ocean region.Mon Wea Rev, 1987, 115:27-50. DOI: 10.1175/1520-0493(1987)115<0027:TACAIV>2.0.CO;2
    Lau K M, Kim K M, Yang S.Dynamical and boundary forcing characteristics of regional components of the Asian summer monsoon.J Climate, 2000, 13: 2461-2481. DOI: 10.1175/1520-0442(2000)013<2461:DABFCO>2.0.CO;2
    黄刚, 严中伟.东亚夏季风环流异常指数及其年际变化.科学通报, 1999, 44(4):421-424. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199904019.htm
    郭其蕴.东亚夏季风强度指数及其变化的分析.地理学报, 1983, 38(3):207-216. http://www.cnki.com.cn/Article/CJFDTOTAL-DLXB198303000.htm
    施能, 朱乾根, 吴彬贵.近四十年东亚夏季风及我国夏季大尺度天气气候异常.大气科学, 1996, 20(5):575-583. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK605.007.htm
    孙秀荣, 陈隆勋, 何金海. 东亚海陆热力差指数与东亚夏季风强度关系讨论∥何金海, 丁一汇, 高辉, 等. 南海夏季风建立日期的确定与季风指数. 北京: 气象出版社, 2001: 96-108.
    张庆云, 陶诗言, 陈烈庭.东亚夏季风指数的年际变化与东亚大气环流.气象学报, 2003, 61(4):559-568. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB200305005.htm
    琚建华, 钱诚, 曹杰.东亚夏季风的季节内振荡研究.大气科学, 2005, 29(2):187-194. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200502002.htm
    Zhu Jinhong, Wang Shaowu.80a-oscillation of summer rainfall over the east part of China and East-Asia summer monsoon. Adv Atmos Sci, 2001, 18(5):1043-1051. http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQJZ200105032.htm
    Wang Y, Wang B, Oh J H.Impact of preceding El Niño on the East Asian summer atmosphere circulation. J Meteor SocJapan, 2001, 79:575-589. DOI: 10.2151/jmsj.79.575
    王启, 丁一汇, 江滢.亚洲季风活动及其与中国大陆降水关系.应用气象学报, 1998, 9(增刊): 84-89. http://www.cnki.com.cn/Article/CJFDTOTAL-YYQX8S1.010.htm
    张庆云, 陶诗言.夏季东亚热带和副热带季风与中国东部汛期降水.应用气象学报, 1998, 9(增刊): 16-23. http://www.cnki.com.cn/Article/CJFDTOTAL-YYQX8S1.002.htm
    高辉, 张芳华.关于东亚夏季风指数的比较.热带气象学报, 2003, 19(1): 79-86. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200301010.htm
    孙颖, 丁一汇. 1997年东亚夏季风异常活动在汛期降水中的作用.应用气象学报, 2002, 13(3): 277-287. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20020338&flag=1
    Xie P P, Phillip A A.Global precipitation:A 17-year monthly analysis based on gauge observations, satellite estimates and numerical model outputs.Bull Amer Meteor Soc, 1997, 78: 2539-2558. DOI: 10.1175/1520-0477(1997)078<2539:GPAYMA>2.0.CO;2
    Kalnay E, Kanamitsu M, Kistler R, et al.The NCEP/NCAR 40-year reanalysis project.Bull Amer Meteor Soc, 1996, 77: 437-471. DOI: 10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2
    Rayner N A, Horton E B, Parker D E, et al.Version 2.2 of the Global Sea-ice and Sea Surface Temperature Data Set, 1903-1994. Climate Research Technical Note 74, Unpublished Document Available from Hadley Centre for Climate Prediction and Research.Meteorological Office, London Road, Bracknell, RS12 2SY, UK, 1996.
    Liang X Z, Wang W C.Association between China monsoon rainfall and tropospheric jets.Q J R Meteor Soc, 1998, 124: 2597-2623. DOI: 10.1002/(ISSN)1477-870X
    Huang R H, Zhou L T, Chen W. The progresses of recent studies on the variabilities of the East Asian monsoon and their causes.Adv Atmos Sci, 2003, 20(1) :55-69. DOI: 10.1007/BF03342050
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    • Received : 2006-05-07
    • Accepted : 2007-01-29
    • Published : 2007-08-30
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