EFFECTS OF LOW-LATITUDE MONSOON SURGE ON THE INCREASE IN DOWNPOUR FROM TROPICAL STORM BILIS

WANG Li-juan; LU Shan; GUAN Zhao-yong; HE Jie-lin

Abstract:

By using the dataset of CMA-STI Tropical Cyclone Optimal Tracks, NCEP/NCAR reanalysis and intensive surface observations, a study is performed of the influences of a low-latitude monsoon surge on the longer persistence and increase in torrential rains from the landing tropical storm Bilis. Results suggest that the southwest monsoon was anomalously active after Bilis came ashore. The westerly winds in Bilis’s south side might give rise to the poleward movement of the SW monsoon, thus enlarging the pressure gradient between Bilis and the anticyclonic circulation to the south with the result of greatly intensified SW monsoon, which fueled plentiful water vapor, heat and momentum into the declining Bilis and allowed its long stay over land instead of erosion and disappearance. Before Bilis’s landfall, the 2006 East Asian monsoon surge, characterized by the atmospheric ISO, experienced remarkable northward propagation. After landfall, the strong surge and powerful low frequency vapor convergence were just on the south side of Bilis, resulting in sharply increased rainfall. In addition, a broad belt of high-valued vapor fluxes extended from the eastern Arabian Sea via the Bay of Bengal, Indochina Peninsula and the South China Sea into the south of China. The belt was linked with the SW monsoon surge forming a moist tongue stretching from the Bay of Bengal to the south of China, which supplied continuously abundant vapor for Bilis along with the surge propagating poleward.

Get Citation+

WANG Li-juan, LU Shan, GUAN Zhao-yong, et al. EFFECTS OF LOW-LATITUDE MONSOON SURGE ON THE INCREASE IN DOWNPOUR FROM TROPICAL STORM BILIS [J]. Journal of Tropical Meteorology, 2010, 16(2): 101-109.

Export:

Article Metrics

EFFECTS OF LOW-LATITUDE MONSOON SURGE ON THE INCREASE IN DOWNPOUR FROM TROPICAL STORM BILIS

Key Laboratory of Meteorological Disaster of Ministry of Education, College of Atmospheric Sciences, Nanjing University of Information Science & Technology

Abstract: By using the dataset of CMA-STI Tropical Cyclone Optimal Tracks, NCEP/NCAR reanalysis and intensive surface observations, a study is performed of the influences of a low-latitude monsoon surge on the longer persistence and increase in torrential rains from the landing tropical storm Bilis. Results suggest that the southwest monsoon was anomalously active after Bilis came ashore. The westerly winds in Bilis’s south side might give rise to the poleward movement of the SW monsoon, thus enlarging the pressure gradient between Bilis and the anticyclonic circulation to the south with the result of greatly intensified SW monsoon, which fueled plentiful water vapor, heat and momentum into the declining Bilis and allowed its long stay over land instead of erosion and disappearance. Before Bilis’s landfall, the 2006 East Asian monsoon surge, characterized by the atmospheric ISO, experienced remarkable northward propagation. After landfall, the strong surge and powerful low frequency vapor convergence were just on the south side of Bilis, resulting in sharply increased rainfall. In addition, a broad belt of high-valued vapor fluxes extended from the eastern Arabian Sea via the Bay of Bengal, Indochina Peninsula and the South China Sea into the south of China. The belt was linked with the SW monsoon surge forming a moist tongue stretching from the Bay of Bengal to the south of China, which supplied continuously abundant vapor for Bilis along with the surge propagating poleward.

HTML

Reference (20)

[1]	WANG Ji-zhi, PRESTON W L. A major low-levelcross-equatorial current at 110°E during the northern summerand its relation to typhoon activities [J]. J. Atmos. Sci., 1984,8(4): 443-449.
[2]	TAO Shi-yan, XU Shu-ying, GUO Qi-yun. Thecharacteristics of the zonal and meridional circulation overtropical and subtropical regions in eastern Asia in summer [J].Acta Meteor. Sinica, 1962, 32(2): 91-103.
[3]	RAMAGE C S. Monsoon Meteorology [M]. New York:Academic Press, 1971: 296pp.
[4]	CHEN Lian-shou, LUO Zhe-xian, Li Ying. Researchadvances on tropical cyclone landfall process [J]. Acta Meteor.Sinica, 2004, 62(5): 541-549.
[5]	CHEN Lian-shou, LUO Hui-bang, DUAN Yi-hong, et al.An overview of tropical cyclone and tropical meteorologyresearch progress [J]. Adv. Atmos. Sci., 2004, 21(3): 505-514.
[6]	LEI Xiao-tu, CHEN Lian-shou. An overview on theinteraction between tropical cyclone and mid-latitude weathersystems [J]. J. Trop. Meteor., 2001, 17(4): 452-461.
[7]	LI Ying, CHEN Lian-shou, WANG Ji-zhi. The diagnosticanalysis on the characteristics of large scale circulationcorresponding to the sustaining and decaying of tropicalcyclone after its landfall [J]. Acta Meteor. Sinica, 2004, 62(2):167-179.
[8]	KANG Zhi-ming, CHEN Tao, QIAN Chuan-hai, et al.Diagnostic analysis on torrential rain caused by the tropicalstorm Bilis(0604) [J]. Plateau Meteor., 2008, 27(3): 596-607.
[9]	XU Ying-long, GAO Shuan-zhu, LIU Zhen-kun. Causeanalysis of maintenance of typhoon Rananim on land [J].Meteor. Mon., 2005, 31(5): 32-36.
[10]	YIN Jie, WANG Huan, CHEN Jian-ping. Diagnosticanalysis of sustained torrential rainfall in southern Chinacaused by severe tropical storm Bilis [J]. Meteor. Sci. Tech.,2008, 36(1): 63-68.
[11]	ZHANG Jian-hai, XUE Gen-yuan, CHEN Hong-mei, et al.Analysis and numerical experiments of the impact of moisturetransportation by southwest monsoon on precipitation of thetropical cyclone Bilis [J]. Sci. Tech. Rev., 2008, 26(3): 74-82.
[12]	LEI Xiao-tu, CHEN Lian-shou. Characteristics of tropicalcyclones activities varying with environmental fields ofmid-and lower-latitudes [J]. J. Trop. Meteor., 2003, 9(1):19-30.
[13]	JIANG Xiao-ping, LIU Chun-xia, FEI Zhi-bin, et al. Theinfluence of South China Sea summer monsoon on therainstorm associated with the landfalling strong tropical stormBilis(0604)[J]. J. Trop. Meteor., 2008, 24(4): 379-384.
[14]	SUN Xiu-rong, DUAN Yi-hong. A study of therelationships between the East Asian summer monsoon andthe tropical cyclone frequency in the northwestern Pacific [J]. J.Atmos. Sci., 2003, 27(1): 67-74.
[15]	ZHANG Qing-yun, PENG Jing-bei. The interannual andinterdecadal variations of East Asian summer circulation andits impact on the landing typhoon frequency over China duringsummer [J]. J. Atmos. Sci., 2003, 27(1): 97-106.
[16]	LI Li, ZHENG Yong. Statistical analysis on torrentialrainfall in Shaoguan caused by tropical cyclone from 1996 to2006 [J]. Guangdong Meteor., 2008, 30(4): 37-38.
[17]	Editorial Board of Atmospheric Sciences Dictionary.Atmospheric Sciences Dictionary [M]. Beijing: MeteorologicalPress, 1994: 1-980.
[18]	JV Jian-hua, SUN Dan, LV Jun-mei. The influence of theEast Asian monsoon stream on the large-scale precipitationcourse in eastern China [J]. J. Atmos. Sci., 2007, 31(6):1129-1139.
[19]	JV Jian-hua, ZHAO Er-xu. Impacts of the low frequencyoscillation in East Asian summer monsoon on the drought andflooding in the middle and lower valley of the Yangtze river [J].J. Trop. meteor., 2005, 21(2): 163-171.
[20]	CHAN J C L, AI W, XU J. Mechanisms responsible forthe maintenance of the 1998 South China Sea summermonsoon [J]. J. Meteor. Soc. Japan, 2002, 80 (5): 1103-1113.

EFFECTS OF LOW-LATITUDE MONSOON SURGE ON THE INCREASE IN DOWNPOUR FROM TROPICAL STORM BILIS

Abstract:

References

Get Citation+

Share Article

Article Metrics

Proportional views

Manuscript History

Online:

通讯作者: 陈斌, bchen63@163.com