The Period of South China Sea Summer Monsoon Advanced Northward with the Related Circulation Change Features

Li Chunhui; Liang Jianyin; Zheng Bin; Lin Ailan; Gu Dejun

Vol.18, NO.2, 2007

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2007 > 18(2): 202-210

Li Chunhui, Liang Jianyin, Zheng Bin, et al. The period of South China Sea summer monsoon advanced northward with the related circulation change features. J Appl Meteor Sci, 2007, 18(2): 202-210.

Citation:

Li Chunhui, Liang Jianyin, Zheng Bin, et al. The period of South China Sea summer monsoon advanced northward with the related circulation change features. J Appl Meteor Sci, 2007, 18(2): 202-210.

Li Chunhui, Liang Jianyin, Zheng Bin, et al. The period of South China Sea summer monsoon advanced northward with the related circulation change features. J Appl Meteor Sci, 2007, 18(2): 202-210.

Citation:

Li Chunhui, Liang Jianyin, Zheng Bin, et al. The period of South China Sea summer monsoon advanced northward with the related circulation change features. J Appl Meteor Sci, 2007, 18(2): 202-210.

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The Period of South China Sea Summer Monsoon Advanced Northward with the Related Circulation Change Features

Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510080

Received Date: 2006-03-20
Rev Recd Date: 2006-11-02
Publish Date: 2007-04-30

Abstract

Abstract

The Southern China is one of the most rainy areas in the country, which is affected by both the tropical and subtropical monsoon.From April to June, the Southern China experiences the first rainy period, namely the pre rainy season, which is also the first phase that the annual rain belt starts appearing and pushes northward.For the whole Southern China, heavy rain during the target months uses to cause a flood, which accounts for 40%—50% or even more of the whole year precipitation.Because they are concentrated and severe, the rains during the pre rainy season always get more attention and have been studied a lot.But, currently some researches always consider the pre rainy season as a whole.In fact, the pre rainy season can be divided into two phases i, e., the frontal rainfall and the monsoon rainfall.But now, there are not yet any analytical studies on it.The time when the South China Sea summer monsoon breaking out does not mean the commencement of the Southern China summer monsoon precipitation until the South China Sea summer monsoon pushes northward to Southern China, which causes the sec ond peak of the pre rainy season.Therefore, the study can distinguish the frontal rainfall and monsoon rainfall reasonably and get the time when the South China Sea summer monsoon affects the Southern China and the characteristic of the related circulation change, it will be beneficial to providing a new way of thinking for improving precipitation forecasting of the pre rainy season in Southern China.Based on European Center for Medium range Weather Forecast (ECMWF) and NCEP daily reanalyzed dataset from 1958 to 2004 and the surface air temperature/rainfall records from 730 stations in China, the results show that the time exists obvious differences.Also, this variety has obvious inter decadal change characteristic, namely that the time the Southern China summer monsoon affects the Southern China is early before 1970s and late in the late 1970s.When the Southern China summer monsoon breaks out, if the East Asian trough is deeper, the cold air activity is more active, the south west wind from the crossing equatorial currents of Somali and around 110°—120 °E areas and the west part of the subtropical high is weaker, and the position of the South Asia high and the East Asian jet is more southward, it would cause the time to be later, otherwise it would cause the time to be earlier.During the period that the Southern China summer monsoon affected the Southern China later (earlier), the transportation of the moisture from the crossing equatorial currents of Somali and around 105°E and 130°E areas and the southeast part of the west Pacific subtropical high is weaker (stronger), the frontal precipitation of the pre rainy season rainfall in the Southern China is stronger (weaker).
- the South China Sea summer monsoon;
- advance;
- the Southern China;
- the characteristic of circulation change

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References(30)

Figures and Tables

图 1 华南地区大气中的水汽、热力及动力状况变化 (a) 1971—2000年100 hPa气候平均华南前汛期纬向风垂直分布 (单位: m/s, 阴影区为东风; 粗点线为850 hPa假相当位温, 单位: K), (b) 大气柱水汽含量变化 (单位: mm), (c) 110°~120°E平均假相当位温的垂直切变 (700 hPa减去925 hPa, 单位: K), (d) 110°~120°E我国大陆测站实测降水 (单位: mm/d), (e) CMA P资料气候平均降水量 (单位: mm/d, 虚线箭头是锋面降水, 实线箭头是季风降水)

Fig. 1 The water vapor, thermal and dynamical variations over South China (a) vertical cross section of 1971—2000 climatological mean zonal winds during pre-rainy season (unit:m/s, easterlies region is shaded; thick line marked by dots is θ_se at 850 hPa, unit:K), (b) predictable w ater content (unit:mm), (c) vertical shear of θ_se averaged for 110°—120°E (θ_se at 700 hPa minus θ_se at 925 hPa, unit:K; regions less than-6 K are shaded), (d) climatological mean precipitation over 110°—120°E during the pre-rainy season from surface stations in China mainland (unit:mm/d), (e) mean precipitation during the pre-rainy season from CMAP data (unit:mm/d, dashed arrows denote frontal rain and solid arrows denote summer monsoon rain)

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图 2 季风推进影响到华南时间距平图

Fig. 2 Time anomalies of the South China Sea summer monsoon advancing to South China

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图 3 推进偏晚年和偏早年由南海夏季风爆发至华南季风降水开始日期时间差异段850 hPa风场差值图

(单位: m/s, 晚减早, 阴影区和实线所围区域分别为纬向风和经向风通过α=0.05的显著性检验区)

Fig. 3 850 hPa wind differences by late years composite and early ones (unit:m/s, late years mean relative long time from South China Sea summer monsoon onset to beginning of monsoon rain over South China, and early years mean relative short time during the process; areas shaded and enclosed by solid line denote the regions that zonal winds and meridional winds exceed α=0.05 significance test, respectively)

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图 4 推进偏晚年和偏早年由南海夏季风爆发至华南季风降水开始日期时间差异段500 hPa位势高度场合成差值图 (单位: gpm)

( 晚减早, 阴影区为通过α =0. 05 的显著性检验区)

Fig. 4 Same as Fig.3 except for 500 hPa geopotential height (unit:gpm)

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图 5 推进偏晚年和偏早年由南海夏季风爆发至华南季风降水开始日期时间差异段的850 hPa温度场合成差值图 (说明同图 4, 单位: K)

Fig. 5 Same as Fig.4 except for 850 hPa air temperature (unit:K)

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图 6 推进偏晚年 (a) 和偏早年 (b) 由南海夏季风爆发至华南季风降水开始日期时间差异段的高低层假相当位温差值图

(单位: K, 其中高、低层分别以600~300 hPa和1000~700 hPa的平均值代替)

Fig. 6 θ_se differences between upper (600—300 hPa) and lower troposphere (1000—700 hPa) (a) late years composite, (b) early years composite

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图 7 推进偏晚年和偏早年由南海夏季风爆发至华南季风降水开始日期时间差异段的平均地表至300 hPa气柱水汽通量合成和差值图 (a) 偏晚年, (b) 偏早年, (c) 偏晚年与偏早年差值 (a和b的阴影区为水汽通量大于1 kg/(cm·s) 区域, c的阴影区为通过α =0.05的显著性检验区)

Fig. 7 Water vapor fluxes from surface to 300 hPa (a) late years composite, (b) early years composite, (c) differences (shaded regions denote water vapor fluxes are larger than 1 kg/(cm·s) in (a) and (b), and represent the areas passing α=0.05 significance test in (c))

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图 8 推进偏晚年 (a) 和偏早年 (b) 由南海夏季风爆发日至华南季风降水开始日期之间得到的时间差异段的区域 (20°~40°N, 100°~120°E) 站点降水合成图

(单位: mm, a和b的阴影区分别为日降水量大于3 mm和1.5 mm区域)

Fig. 8 Precipitation composite from surface stations data in the region of 20°—40°N, 100°—120°E (a) late years, (b) early years (unit:mm, daily precipitations larger than 3 mm and 1.5mm are shaded in (a) and (b), respectively)

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表 1 1958—2004年南海夏季风爆发日期、华南季风降水开始日期和季风推进影响到华南地区时间

Table 1 Dates of South China Sea summer monsoon onset and beginning of monsoon rain over South China and time intervals between them

References

[1]	吴尚森, 梁建茵.华南前汛期旱涝时空分布特征.热带气象学报, 1992, 8(1):87-92. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX199201010.htm
[2]	林爱兰, 吴尚森.近40年华南汛期旱涝变化及趋势预测.热带气象学报, 1996, 12(2):160-166. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX602.007.htm
[3]	梁建茵.6月西太平洋副高脊线的年际变化及其对华南降水的影响.热带气象学报, 1994, 10(3):274-279. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX199403009.htm
[4]	覃武, 孙照渤, 丁宝善, 等.华南前汛期雨季开始期的降水及环流特征.南京气象学报, 1994, 17(4):455-461. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX404.009.htm
[5]	邓立平, 王谦谦.华南前汛期 (4~6月) 降水异常特征及其与我国近海海温的关系.热带气象学报, 2002, 18(1):44-55. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200201005.htm
[6]	郭其蕴, 沙万英.华南前汛期降水变率的分析.应用气象学报, 1998, 9(增刊):9-15. http://www.cnki.com.cn/Article/CJFDTOTAL-YYQX8S1.001.htm
[7]	高波, 陈乾金, 任殿东.江南南部-华南北部前汛期严重旱涝诊断分析.应用气象学报, 1999, 10(2):219-226. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990249&flag=1
[8]	蔡学湛, 许金镜, 吴滨.严重旱涝与低温的诊断分析和预测方法研究.北京:气象出版社, 2000:166-173. http://www.cnki.com.cn/Article/CJFDTOTAL-SYQY201603027.htm
[9]	吴恒强, 张爱华, 蒋伯仁, 等.华南前汛期降水与南极海冰变化的关系.南京气象学报, 1998, 21(2):266-273. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX802.014.htm
[10]	陶诗言.1994年东亚夏季风活动的异常与华南的特大洪涝灾害, Ⅰ大气环流的异常∥研讨会技术组.1994年华南特大暴雨洪涝学术研讨会论文集.北京: 气象出版社, 1996: 1-5.
[11]	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
[12]	李春晖, 梁建茵, 吴尚森.近百年广州汛期降水变化特征及其影响因子.热带气象学报, 2004, 20(4):365-374. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200404003.htm
[13]	史学丽, 丁一汇.1994年中国华南大范围暴雨过程的形成与夏季风活动的研究.气象学报, 2000, 55(6):666-678. doi: 10.11676/qxxb2000.068
[14]	吴尚森, 薛纪善.1994年华南特大暴雨的气候背景∥1994年华南夏季特大暴雨研究.北京: 气象出版社, 1996: 23-30.
[15]	李玉兰, 杜长萱, 陶诗言.1994年东亚夏季风活动的异常与华南的特大洪涝灾害 (Ⅱ)∥研讨会技术组.1994年华南特大暴雨洪涝学术研讨会论文集.北京: 气象出版社, 1996: 6-13.
[16]	张爱华, 吴恒强, 覃武, 等.南半球大气环流对华南前汛期降雨影响初探.气象, 1997, 23(8):9-15. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX708.002.htm
[17]	薛峰, 王会军, 何金海.马斯克林高压和澳大利亚高压的年际变化及其对东亚夏季风降水的影响.科学通报, 2003, 48(3):287-291. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200303017.htm
[18]	李崇银, 龙振夏, 李桂龙.南海热带大气低频振荡与华南初夏降水异常∥研讨会技术组.1994年华南特大暴雨洪涝学术研讨会论文集.北京: 气象出版社, 1996: 17-23.
[19]	陈隆勋, 李薇, 赵平, 等.东亚地区夏季风爆发过程.气候与环境研究, 2000, 5(4):345-355. http://www.cnki.com.cn/Article/CJFDTOTAL-QHYH200004001.htm
[20]	江静, 钱永甫.南海地区降水的时空特征.气象学报, 2000, 58(1):60-69. doi: 10.11676/qxxb2000.006
[21]	乔云亭, 简茂球, 罗会邦, 等.南海夏季风降水的区域差异及其突变特征.热带气象学报, 2002, 18(1):38-44. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200201004.htm
[22]	刘霞, 谢安.南海夏季风爆发的气候特征.热带气象学报, 1998, 14(1):28-37. http://cdmd.cnki.com.cn/Article/CDMD-10423-1011231302.htm
[23]	梁建茵, 吴尚森.南海西南季风爆发日期及其影响因子.大气科学, 2002, 26(6):829-844. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200801007.htm
[24]	贺海晏, 温之平, 简茂球, 等.1982-1996年亚洲热带夏季风建立迟早的探讨 (Ⅰ) 热带季风环流的主要特征和季风建立指数.中山大学学报 (自然科学版), 2000, 39(3):91-96. http://www.cnki.com.cn/Article/CJFDTOTAL-ZSDZ200004022.htm
[25]	Wang B, Lin Ho, Zhang Y S, et al.Definition of south China sea monsoon onset and commencement of the east Asia summer monsoon.J Climate, 2004, 17 (4):699-710. doi: 10.1175/2932.1
[26]	刘霞.南海夏季风爆发的气候特征.热带气象学报, 1998, 14(1):28-37. http://cdmd.cnki.com.cn/Article/CDMD-10423-1011231302.htm
[27]	梁建茵, 吴尚森.南海夏季风的建立及强度变化.热带气象学报, 1999, 15(2):97-105. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX199902000.htm
[28]	张秀芝, 李江龙, 阎俊岳, 等.南海夏季风爆发的环流特征及指标研究.气候与环境研究, 2002, 7(3):321-331. http://www.cnki.com.cn/Article/CJFDTOTAL-QDHY200405006.htm
[29]	Liang Jianyin, Wu Shangsen.Diagnostic analysis of interdecadal change of the summer monsoon in the south China sea.ACTA Meteorologica Sinica, 2003, 17(suppl):81-94. https://www.researchgate.net/publication/294374680_Diagnostic_analysis_of_interdecadal_changes_of_the_summer_monsoon_in_the_South_China_Sea
[30]	李崇银, 屈昕.伴随南海夏季风爆发的大尺度大气环流演变.大气科学, 2000, 24(1):1-14. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200001000.htm