Identification on the Beginning Date and End Date of Rainy Season over North China and Their Climatology

Liu Haiwen; Ding Yihui

Vol.19, NO.6, 2008

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2008 > 19(6): 688-696

Liu Haiwen, Ding Yihui. Identification on the beginning date and end date of rainy season over North China and their climatology. J Appl Meteor Sci, 2008, 19(6): 688-696.

Citation:

Liu Haiwen, Ding Yihui. Identification on the beginning date and end date of rainy season over North China and their climatology. J Appl Meteor Sci, 2008, 19(6): 688-696.

Liu Haiwen, Ding Yihui. Identification on the beginning date and end date of rainy season over North China and their climatology. J Appl Meteor Sci, 2008, 19(6): 688-696.

Citation:

Liu Haiwen, Ding Yihui. Identification on the beginning date and end date of rainy season over North China and their climatology. J Appl Meteor Sci, 2008, 19(6): 688-696.

PDF( 1736 KB)

Identification on the Beginning Date and End Date of Rainy Season over North China and Their Climatology

Liu Haiwen^1,2,
Ding Yihui³

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Nanjing University of In formation Science & Technology, Nanjing 210044
3.
National Climate Center, Beijing 100081

Received Date: 2008-02-18
Rev Recd Date: 2008-08-22
Publish Date: 2008-12-31

Abstract

Abstract

Semi-objective analysis method designed by Samel et al, Mann-Kendall test method and moving t-test technique are used based on the understanding of rainy season in order to investigate the beginning and end dates of rainy season over North China.The yearly initial date and final date of rainy season over North China are set up, and their climatological dates are further identified. The results show that rainy season in North China has an average duration of 50 days, starting on Jun 30 and ending on Aug 18 from climatology aspect. The period of heavy rainfall for the rainy season in North China is from Jul 19 to Aug 14, which is also the mature period of summer monsoon.The initial date, end date and the duration of rainy season and the frequency of no rainy season have regional features over North China. Rainy season has the earliest staring dates, late ending dates, longer duration days and the lowest frequency of no rainy season in the mountainous areas on the north of Hebei Province. Late starting dates and higher frequency of none rainy season are in the Loess Plateau while the latest ending dates and the longest duration days are on the north of the Loess Plateau. The earlier starting date, the earliest ending date, the shortest duration days and higher frequency no rainy season are in the mid-lower Basins of Yellow River, and the latest starting date, late ending date, longer duration days and highest frequency of none rainy season are in the west of Hebei plain. There are different trends for the initial dates, end dates, duration days of rainy season and frequency of none rainy season over North China. Duration days of rainy season have the most significant decreasing trend and the end dates also have obvious decreasing trend, while the total stations have significant increasing trend and the initial dates also have a slight increasing trend. All of these trends are of benefit to the decrease of summer rainfall over North China. There are close relationships between the rainfall of rainy season over North China and the initial dates, duration days of rainy season, the total stations of none rainy season. When rainy season begins earlier(later), duration days of rainy season last longer(shorter), the total stations are more(less), rainfalls of rainy season over North China are more(less).When positive anomalies of geo-potential height over the west Pacific exit, meanwhile negative anomalies of geo-potential height in the 500 hPa filed exit over North China, and the pattern is an anomalies of "east high and west low" between the Chinese mainland and west Pacific in the surface, the results are that the anomalies of south wind reach 30°N, the rainy season begins over North China. However, when smaller positive anomalies of geo-potential height in the 500 hPa field exit over North China, positive anomalies of geo-potential height in the 500 hPa field exit over Japanese sea, and the pattern is anomalies of "west high and east low" between the Chinese mainland and west Pacific, the results are that the anomalies of north wind influence Eastern China, the rainy season ends in North China.
- North China;
- rainy season;
- climatology

FullText(HTML)

References(19)

Figures and Tables

图 1 1971-2000年平均EOF第一特征向量对应时间系数(实线)及其7 d滑动平均(虚线)(水平线为等于0.7的阈值线)

Fig. 1 The 1971-2000 mean value corresponding time coefficient series of the first mode of EOF(solid line)and their 7-day running average(dashed line)(the level line represents cutoff value of 0.7)

DownLoad: Full-Size Img PowerPoint

图 2 1971-2000年平均EOF第一特征向量对应时间系数(6月14日-8月6日)Mann-Kendall统计量曲线

(直线表示信度为95%的临界线)

Fig. 2 Mann-Kendall test of the 1971-2000 mean value corresponding time coefficient series(from Jun 14 to Aug 6)of the first mode of EOF

(the horizontal line denotes the confidence level at 95%)

DownLoad: Full-Size Img PowerPoint

图 3 1971-2000年平均EOF第一特征向量对应时间系数(8月6日-9月12日)Mann-Kendall统计量曲线

(直线表示信度为95%的临界线)

Fig. 3 Mann-Kendall test of the 1971-2000 mean value corresponding time coefficient series(from Aug 6 to Sep 12)of the first mode of EOF

(horizontal line denotes the confidence level at 95%)

DownLoad: Full-Size Img PowerPoint

图 4 华北区域平均的垂直速度高度-时间剖面

(单位: 0.01 Pa.s ^-1; 阴影区表示上升运动)

Fig. 4 Height-time cross-section of vertical velocity over North China

(unit :0.01 Pa.s ^-1; upward motion area are shaded)

DownLoad: Full-Size Img PowerPoint

图 5 1971-2000年平均的华北汛期开始日期(a)和结束日期(b)(日序)的空间分布

Fig. 5 The 1971-2000 mean spatial distribution of beg inning date(a)and end date(b)of rainy season over North China

DownLoad: Full-Size Img PowerPoint

图 6 1971-2000年平均的华北汛期空汛频次空间分布(单位: a^-1)

Fig. 6 The 1971-2000 mean spatial distribution of the frequency of no rainy season during rainy season over North China(unit:a ^-1)

DownLoad: Full-Size Img PowerPoint

图 7 1971-2000年平均的华北汛期开始(a)和结束(b)时850 hPa风场对华北汛期平均场的距平分布

(单位: m · s^-1; 阴影区表示超过了95%信度检验的区域; 虚线为1500 m地形高度线)

Fig. 7 1971-2000 mean 850 hPa wind anomalies for rainy season wind field when rainy season starts(a)and ends(b)over North China

(uint :m · s^-1; regions over 95% confidence level are shaded; dashed line is 1500 mterrain height)

DownLoad: Full-Size Img PowerPoint

图 8 华北汛期开始(a)和结束(b)日期(虚线)的时间序列和线性趋势(点划线)(水平线是其平均值)

Fig. 8 Time series of beginning date(a)and end date(b)of rainy season over North China(dashed line)and it linear trend(dot-dashed line)(solid horizontal line corresponds to the mean date)

DownLoad: Full-Size Img PowerPoint

图 9 华北空汛站数(虚线)的时间序列和线性趋势(点划线)(水平线是其平均值)

Fig. 9 Time series of total stations of no rainy season over North China(dashed line)and it's linear trend(dot-dashed line)(solid horizontal line corresponds to the mean date)

DownLoad: Full-Size Img PowerPoint

References

[1]	章基嘉孙照渤陈松军.用自然正交函数分解法划分自然天气季节的研究.南京气象学院学报, 1982, 2:189-195. http://www.cnki.com.cn/Article/CJFDTOTAL-NJQX198202004.htm
[2]	陆日宇.华北汛期降水量年际变化与赤道东太平洋海温.科学通报, 2005, 50(11):1131-1135. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200511012.htm
[3]	冯丽文.北京近255年汛期及其多年变化.气象学报, 1980, 38(4):341-350. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB198004005.htm
[4]	戴新刚, 汪萍, 丑纪范.华北汛期降水多尺度特征与夏季风年代际衰变.科学通报, 2003, 48(23):2483-2487. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200323016.htm
[5]	孙建华, 张小玲, 卫捷, 等.20世纪90年代华北大暴雨过程特征的分析研究.气候与环境研究, 2005, 10(3):492-506. http://www.cnki.com.cn/Article/CJFDTOTAL-QHYH200503019.htm
[6]	丁一汇, 柳俊杰, 孙颖, 等.东亚梅雨系统的天气-气候学研究.大气科学, 2007, 31(6):1082-1101. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200706006.htm
[7]	鲍名.近50年我国持续性暴雨的统计分析及其大尺度环流背景.大气科学, 2007, 31(5):779-792. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200705002.htm
[8]	梁萍, 何金海, 陈隆勋, 等.华北夏季强降水的水汽来源.高原气象, 2007, 26(3):460-465. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200703003.htm
[9]	魏凤英.现代气候统计诊断预测技术.北京:气象出版社, 1999.
[10]	Samel N A, Wang W C, Lang X Z. The monsoon rainband over China and relationships with the eurasian circulation. J Clim, 1999, 12(1):115-131. doi: 10.1175/1520-0442-12.1.115
[11]	王遵娅, 丁一汇, 何金海, 等.近50年来中国气候变化特征的再分析.气象学报, 2004, 62(2):228-236. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB200402009.htm
[12]	符淙斌, 王强.气候突变的定义和检测方法.大气科学, 1992, 16(4):482-493. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK199204010.htm
[13]	赵平, 周秀骥.近40年我国东部降水持续时间和雨带移动的年代际变化.应用气象学报, 2006, 17(5):548-556. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20060594&flag=1
[14]	陈烈庭.华北各区夏季降水年际和年代际变化的地域性特征.高原气象, 1999, 18(4):477-485. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX199904001.htm
[15]	Lau K M, Yang S. Climatology hnd interannual variability of the Southeast Asian summer monsoon. Adv Atmos Sci, 1997, 14:141-162. doi: 10.1007/s00376-997-0016-y
[16]	Wang B, Lin H. Rainy seasons of the Asian-Pacific monsoon. J Climate, 2002, 15:386-396. doi: 10.1175/1520-0442(2002)015<0386:RSOTAP>2.0.CO;2
[17]	赵汉光.华北的雨季.气象, 1994, 20(6):3-8. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX406.000.htm
[18]	丁青兰, 王令, 陈明轩, 等.北京地区暖季对流天气的气候特征.气象, 2007, 33(10):37-44. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200710007.htm
[19]	卫捷, 张庆云, 陶诗言.近20年华北地区干旱期大气环流异常特征.应用气象学报, 2003, 14(2):140-151. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20030219&flag=1