NUMERICAL STUDY OF COLD AIR IMPACT ON RAINFALL REINFORCEMENT ASSOCIATED WITH TROPICAL CYCLONE TALIM (2005): I. IMPACT OF DIFFERENT COLD AIR INTENSITY

DONG Mei-ying; CHEN Lian-shou; LI Ying; CHENG Zheng-quan; ZHENG Pei-qun

Abstract:

In 2005, significant rainfall reinforcement and severe disaster was induced by tropical cyclone (TC) Talim after it made landfall on the east of China. Observational analyses show that it has relationship with cold air intrusion. For investigating the impact of cold air intensity, we make use of Weather Research and Forecasting (WRF) model, the synthesizer of NCEP/NCAR reanalysis data and Japan regional spectral model data, to carry out numerical experiments. Results show that rainfall reinforcement occurs in all experiments. Different intensity of cold air can modify the rainfall distribution and intensity significantly. In the rainfall center, the increment maximum of rainfall is twice as large as that of the minimum. Moderate cold air intrusion may result in the strongest rainfall reinforcement. Different cold air intensity can lead to different motion of low-level convergence lines and fronts. There is a good relationship between the rainfall region and the eastern part of the front. On one hand, strong cold air weakens the TC intensity by its intrusion into the TC center and results in weak convergence and a convergent zone and a rain band shifted southward. On the other hand, weak cold air reduces the convergence and moves the convergent zone and rain band northward. Moderate cold air intrusion maintains strong low-level convergence and high-level divergence, keeping strong upward motion over certain regions. Consequently, the rain band begins to stagnate and rainfall reinforces abruptly therein.

Get Citation+

DONG Mei-ying, CHEN Lian-shou, LI Ying, et al. NUMERICAL STUDY OF COLD AIR IMPACT ON RAINFALL REINFORCEMENT ASSOCIATED WITH TROPICAL CYCLONE TALIM (2005): I. IMPACT OF DIFFERENT COLD AIR INTENSITY [J]. Journal of Tropical Meteorology, 2013, 19(1): 87-96.

Export:

Article Metrics

NUMERICAL STUDY OF COLD AIR IMPACT ON RAINFALL REINFORCEMENT ASSOCIATED WITH TROPICAL CYCLONE TALIM (2005): I. IMPACT OF DIFFERENT COLD AIR INTENSITY

Zhejiang Institute of Meteorological Sciences, Hangzhou 310008 China

State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 China

Guangdong Provincial Meteorological Observatory, Guangzhou 510080 China

Zhejiang Provincial Meteorological Observatory, Hangzhou 310017 China

Received Date: 2011-05-10

Rev Recd Date: 2012-11-03

Abstract: In 2005, significant rainfall reinforcement and severe disaster was induced by tropical cyclone (TC) Talim after it made landfall on the east of China. Observational analyses show that it has relationship with cold air intrusion. For investigating the impact of cold air intensity, we make use of Weather Research and Forecasting (WRF) model, the synthesizer of NCEP/NCAR reanalysis data and Japan regional spectral model data, to carry out numerical experiments. Results show that rainfall reinforcement occurs in all experiments. Different intensity of cold air can modify the rainfall distribution and intensity significantly. In the rainfall center, the increment maximum of rainfall is twice as large as that of the minimum. Moderate cold air intrusion may result in the strongest rainfall reinforcement. Different cold air intensity can lead to different motion of low-level convergence lines and fronts. There is a good relationship between the rainfall region and the eastern part of the front. On one hand, strong cold air weakens the TC intensity by its intrusion into the TC center and results in weak convergence and a convergent zone and a rain band shifted southward. On the other hand, weak cold air reduces the convergence and moves the convergent zone and rain band northward. Moderate cold air intrusion maintains strong low-level convergence and high-level divergence, keeping strong upward motion over certain regions. Consequently, the rain band begins to stagnate and rainfall reinforces abruptly therein.

HTML

Reference (26)

[1]	CHEN Lian-shou, DING Yi-hui. Introduction toWest Pacific Typhoons [M]. Beijing: Science Press,1979: 440-488.
[2]	DONG Mei-ying, CHEN Lian-shou, ZHENGPei-qun, et al. On progress in research ofextraordinary and sudden amplification of heavyrainfall associated with landfalling tropical cyclones[J]. J. Trop. Meteor., 25(4): 495-502 (in Chinese).
[3]	CHEN Lian-shou. Observations and forecasts ofrainfall distribution [C]// Workshop Topic Reports ofSixth WMO International Workshop on TropicalCyclones (IWTC-VI), 2006: 36-42.
[4]	TAO Shi-yan, Coauthors, 1980: Rainstorms inChina [M]. Beijing: Science Press, 121-132.
[5]	FOLEY G R, HANSTRUM B N. The capture oftropical cyclones by cold fronts off the west coast ofAustralia [J]. Wea. Forecast., 1994, 9(4): 577-592.
[6]	DIMEGO G J, BOSART L F. The transformationof tropical storm Agues into an extratropical cyclone,Part I: The observed fields and vertical motioncomputations [J]. Mon. Wea. Rev., 1982, 110:385-411.
[7]	HARR P A, ELSBERRY R L. ExtratropicalTransition of Tropical Cyclones over the WesternNorth Pacific, Part I: Evolution of StructuralCharacteristics during the Transition Process [J]. Mon.Wea. Rev., 2000, 128(8): 2613-2633.
[8]	HARR P A, ELSBERRY R L. ExtratropicalTransition of Tropical Cyclones over the WesternNorth Pacific, Part II: The Impact of MidlatitudeCirculation Characteristics [J]. Mon. Wea. Rev., 2000,128(8): 2634-2653.
[9]	KLEIN P M, HARR P A, ELSBERRY R L.Extratropical Transition of Western North PacificTropical Cyclones: Midlatitude and Tropical CycloneContributions to Reintensification [J]. Mon. Wea. Rev.,2002, 130(9): 2240-2259.
[10]	XU Xiang-de, CHEN Lian-shou, XIE Yi-yang.On large-scale frontal systems of environmental fieldin relation to structural characteristics of typhoonextra-tropical transition and associated generation ofheavy rainfall [J]. Chin. J. Atmos. Sci., 1998, 22(5),744-752.
[11]	NIU Xue-xin, DU Hui-liang, LIU Jian-yong.Numerical experiment on precipitation and itsmechanism associated with tropical cyclone Sinlaku(2002) [J]. Acta Meteor. Sinica, 2005, 63(1):57-68 (inChinese).
[12]	LI Ying. The generation and development ofmeso-scale convergence line in the circulation oftropical cyclone Rananim (2004) [C]// Abstracts of the14th National Symposium on Tropical Cyclones,Shanghai, 2007: 46-50.
[13]	LIANG Jun, CHEN Lian-shou, ZHANGSheng-jun, et al. Numerical study of impact of cold airon rainfall of tropical cyclone over Liao-dongpeninsula [J]. Chin. J. Atmos. Sci., 2008, 32(5):1107-1118.
[14]	DONG Mei-ying, CHEN Lian-shou, LI Ying, etal. Rainfall Reinforcement Associated withLandfalling Tropical Cyclones [J]. J. Atmos. Sci.,2010, 67(11): 3541-3558.
[15]	DONG Mei-ying. The study on the mechanism ofrainfall reinforcement associated with landfallingtropical cyclones [D]. Doctoral Thesis, ChineseAcademy of Meteorological Sciences and NanjingUniversity of Information Science and Technology.2010, 153 pp.
[16]	ARW Version 2 Modeling System User’s Guide[EB/OL]. 2007, http://www.mmm.ucar.edu/wrf/users/.
[17]	ZHANG Guo-cai. Progress and perspective ofWRF model [J]. Meteor. Mon., 2004, 30(12): 27-31.
[18]	ZENG Zhi-hua, CHEN Lian-shou, WANGYu-qing, et al. A numerical simulation study of superTyphoon Saomei (2006) intensity and structurechanges [J]. Acta Meteor. Sinica, 2009, 67(5):750-763 (in Chinese).
[19]	LI Jia-peng, YIN Yan, JIN Lian-ji, et al. Anumerical study of tropical deep convection usingWRF model [J]. J. Trop. Meteor. 2010, 16(3):247-254.
[20]	DONG Mei-ying, CHEN Lian-shou, LI Ying, etal. Numerical study of topography effect on rainfallreinforcement associated with tropical cyclone Talim(2005) [J]. Plateau Meteor., 2011, 30(3): 700-710.
[21]	LU Xian-chi, HE Bing. Comparison analysis ofgrid-spectrum transformation in initial field [J]. Chin. J. Comput. Phys.. 1992, 9(4): 768-770.
[22]	MENG Zhi-yong, XU Xiang-de, CHENLian-shou. Meso-scale characteristics analysis ininteraction between typhoon Tim (1994) andmid-latitude systems [J]. Acta Meteor. Sinica, 2002,60(1): 31-39 (in Chinese).
[23]	LI Ying, CHEN Lian-shou, LEI Xiao-tu.Numerical study on impacts of upper-level westerlytrough on the extratropical transition process oftyphoon Winnie (1997) [J]. Acta Meteor. Sinica, 2006,64(5): 552-563 (in Chinese).
[24]	BOSART L F, DEAN D B. The Agnes rainstormof June 1972: Surface feature evolution culminating ininland storm redevelopment [J]. Wea. Forecast., 1991,6: 515-537.
[25]	GAO S, MENG Z, ZHANG F, et al.Observational analysis of heavy rainfall mechanismsassociated with severe tropical storm Bilis (2006)after its landfall [J]. Mon. Wea. Rev., 2009, 137:1881-1897.
[26]	LU Han-cheng, YANG Guo-xiang. Theory andforecasting of meso-scale weather [M]. Beijing: ChinaMeteorological Press. 2004, 9-10.

NUMERICAL STUDY OF COLD AIR IMPACT ON RAINFALL REINFORCEMENT ASSOCIATED WITH TROPICAL CYCLONE TALIM (2005): I. IMPACT OF DIFFERENT COLD AIR INTENSITY

Abstract:

References

Get Citation+

Share Article

Article Metrics

Proportional views

Manuscript History

Online:

通讯作者: 陈斌, bchen63@163.com