IMPACTS OF MONTHLY ANOMALIES OF INTRASEASONAL OSCILLATION OVER SOUTH CHINA SEA AND SOUTH ASIA ON THE ACTIVITY OF SUMMER MONSOON AND RAINFALL IN EASTERN CHINA

QUE Zhi-ping; WU Fan; BI Chen; LONG Yu-liang; LI Chong-yin

doi:10.16555/j.1006-8775.2016.02.005

Abstract:

The impact of strong (weak) intraseasonal oscillation (ISO) over South China Sea (SCS) and South Asia (SA) in summer on the SCS and SA summer monsoon and the summer rainfall in Eastern China are studied by using the NCEP-NCAR analysis data and the rainfall data of 160 stations in China from 1961 to 2010. It is found that the impacts are significantly different in different months of summer. The study shows that in June and July cyclonic (anticyclonic) atmospheric circulation over SCS and SA corresponds to strong (weak) ISO over SCS. In August, however, strong (weak) ISO over SCS still corresponds to cyclonic (anticyclonic) atmospheric circulation over SA. In June and August cyclonic (anticyclonic) atmospheric circulation over South Asia corresponds to strong (weak) ISO over SA while a strong (weak) ISO corresponds to anticyclonic (cyclonic) atmospheric circulation over SA in July. Besides, in June the strong (weak) ISO over SA corresponds to cyclonic (anticyclonic) atmospheric circulation over SCS, while in July and August the atmospheric circulation is in the same phase regardless of whether the ISO over SA is strong or weak. The impacts of the strong（weak）ISO over SCS on the rainfall of eastern China are similar in June and July, which favors less (more) rainfall in Yangtze-Huaihe Rivers basin but sufficient (deficient) rainfall in the south of Yangtze River. However, the impacts are not so apparent in August. In South Asia, the strong (weak) ISO in July results in less (more) rainfall in the south of Yangtze River but sufficient (deficient) rainfall in Yangtze-Huaihe Rivers basin. The influence on the rainfall in eastern China in June and August is not as significant as in July.

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QUE Zhi-ping, WU Fan, BI Chen, et al. IMPACTS OF MONTHLY ANOMALIES OF INTRASEASONAL OSCILLATION OVER SOUTH CHINA SEA AND SOUTH ASIA ON THE ACTIVITY OF SUMMER MONSOON AND RAINFALL IN EASTERN CHINA [J]. Journal of Tropical Meteorology, 2016, 22(2): 145-158, https://doi.org/10.16555/j.1006-8775.2016.02.005

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IMPACTS OF MONTHLY ANOMALIES OF INTRASEASONAL OSCILLATION OVER SOUTH CHINA SEA AND SOUTH ASIA ON THE ACTIVITY OF SUMMER MONSOON AND RAINFALL IN EASTERN CHINA

Meteorological Service Center of Jiangxi, Nanchang 330046 China

Rev Recd Date: 2015-12-12

Abstract: The impact of strong (weak) intraseasonal oscillation (ISO) over South China Sea (SCS) and South Asia (SA) in summer on the SCS and SA summer monsoon and the summer rainfall in Eastern China are studied by using the NCEP-NCAR analysis data and the rainfall data of 160 stations in China from 1961 to 2010. It is found that the impacts are significantly different in different months of summer. The study shows that in June and July cyclonic (anticyclonic) atmospheric circulation over SCS and SA corresponds to strong (weak) ISO over SCS. In August, however, strong (weak) ISO over SCS still corresponds to cyclonic (anticyclonic) atmospheric circulation over SA. In June and August cyclonic (anticyclonic) atmospheric circulation over South Asia corresponds to strong (weak) ISO over SA while a strong (weak) ISO corresponds to anticyclonic (cyclonic) atmospheric circulation over SA in July. Besides, in June the strong (weak) ISO over SA corresponds to cyclonic (anticyclonic) atmospheric circulation over SCS, while in July and August the atmospheric circulation is in the same phase regardless of whether the ISO over SA is strong or weak. The impacts of the strong（weak）ISO over SCS on the rainfall of eastern China are similar in June and July, which favors less (more) rainfall in Yangtze-Huaihe Rivers basin but sufficient (deficient) rainfall in the south of Yangtze River. However, the impacts are not so apparent in August. In South Asia, the strong (weak) ISO in July results in less (more) rainfall in the south of Yangtze River but sufficient (deficient) rainfall in Yangtze-Huaihe Rivers basin. The influence on the rainfall in eastern China in June and August is not as significant as in July.

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[1]	MADDEN R A, JULIAN P R. Detection of a 40-50 day oscillation in the zonal wind in the tropical Pacific [J]. J Atmos Sci, 1971, 28: 702-708.
[2]	MADDEN R A, JULIAN P R. Description of globe scale circulation cells in the tropics with 40-50 day period [J]. J Atmos Sci, 1972, 29: 1 109- 1 123.
[3]	KRISHNAMURTI T N, SUBRAHMANYAN D. The 30-50 day mode at 850mb during MONEX [J]. J Atmos Sci, 1982, 39: 2 088-2 095.
[4]	MURAKAMI M. 30-40 day global atmospheric changes during the northern summer 1979 [J]. GARP Special Report, 1984, 44: 11-35.
[5]	LAU K M, CHAN P H. Aspects of the 40-50 day oscillation during Northern summer as inferred from outgoing long wave radiation [J]. Mon Wea Rev, 1986, 114: 1 354-1 367.
[6]	LI Chong-yin. Atmospheric low-frequency oscillation [M]. Beijing: China Meteorological Press.1990: 310 (in Chinese).
[7]	LI Chong-yin. Some fundamental problems of intraseasonal oscillation in the tropical atmosphere [J]. J Trop Meteorol, 1995, 11(3): 276-288 (in Chinese). [8 DONG Min, LI Chong-yin. Some progress in the simulation study of the intraseasonal oscillation of the tropical atmosphere [J]. Chin J Atmos Sci, 2007, 31: 1 113-1 122.
[8]	TAO S Y, CHEN L X. A review of recent research on the East Asian summer monsoon in China [C]. Monsoon Meteorol. Oxford: Oxford University Press, 1987: 60-92.
[9]	LI Chong-yin, ZHANG Li-ping. Characteristics of SCS summer monsoon and the index [J]. Prog Nat Sci, 1999, 9: 536-541 (in Chinese).
[10]	YANG Hui, LI Chong-yin: The relation between atmospheric intraseasonal oscillation and summer severe flood and drought in the Changjiang-Huaihe basin [J]. Adv Atmos Sci, 2003, 20: 540-553.
[11]	LAU K M, WU H T, YANG S. Hydrologic processes associated with the first transition of the Asian summer monsoon: A pilot satellite study [J]. Bull Amer Meteorol Soc, 1998, 79: 1 871-1 882.
[12]	VERNEKAR A D, JI Y. Simulation of the onset and intraseasonal variability of two contrasting summer monsoon [J]. J Climate, 1999, 12: 1 707-1 725.
[13]	Li Chong-yin, LI Li, QUE Zhi-ping. Further research on mechanism of TBO in South Asian monsoon region [J]. J Trop Meteorol, 2014, 20(3): 202-207.
[14]	WU Shang-sen, LIANG Jian-yin. An index of South China Sea summer monsoon intensity and its variation characteristics [J]. J Trop Meteorol, 2001, 7(1): 1-10.
[15]	XU Guo-qiang, ZHU Qian-gen. Feature analysis of summer monsoon LFO over SCS in 1998 [J]. J Trop Meteorol, 2003, 9(1): 49-56.
[16]	LI Chong-yin, MU Ming-quan, LONG Zhen-xia. Influence of intraseasonal oscillation on East-Asian summer monsoon [J]. Acta Meteorol Sinica, 2003, 17: 130-142 (in Chinese).
[17]	CHEN Shang-feng, WEN Zhi-ping, CHEN Wen. Tropical low frequency oscillation with 30-60 day period and its possible influence on the South China Sea summer monsoon [J]. Chin J Atmos Sci, 2011, 35(5): 982-992 (in Chinese).
[18]	JU Jian-hua, ZHAO Er-xu. Impacts of the low frequency oscillation in East Asian summer monsoon on the drought and flooding in the middle and lower valley of the Yangtze River [J]. J Trop Meteorol, 2005, 21(2): 163-171 (in Chinese).
[19]	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, 6: 1 146-1 160.
[20]	Qi Yan-jun, ZHANG Ren-he, WEN Min. The role of the atmospheric intraseasonal oscillation playing in the establishment and the interannual variability of the Indian summer monsoon [J]. Chin Sci Bull, 2008, 53(23): 2 972-2 975 (in Chinese).
[21]	XUAN Shou-li, ZHANG Qing-yun, SUN Shun-qing. Relationship between the monthly variation of the East Asia westerly jet and the Huaihe River valley rainfall anomaly in summer [J]. Clim Environ Res, 2011, 16(2): 231-242 (in Chinese).

IMPACTS OF MONTHLY ANOMALIES OF INTRASEASONAL OSCILLATION OVER SOUTH CHINA SEA AND SOUTH ASIA ON THE ACTIVITY OF SUMMER MONSOON AND RAINFALL IN EASTERN CHINA

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