RELATIONSHIPS BETWEEN THE POSITION VARIATION OF THE WEST PACIFIC SUBTROPICAL HIGH AND THE DIABATIC HEATING DURING PERSISTENT INTENSE RAIN EVENTS IN YANGTZE-HUAIHE RIVERS BASIN

WANG Li-juan; CHEN Xuan; GUAN Zhao-yong; ZENG Ming-jian

Abstract:

By using NCEP/NCAR daily reanalysis data and daily precipitation data of 740 stations in China, relationships between the position variation of the West Pacific subtropical high (WPSH) and the diabatic heating during persistent and intense rains in the Yangtze-Huaihe Rivers basin are studied. The results show that the position variation of WPSH is closely associated with the diabatic heating. There are strong apparent heating sources and moisture sinks in both the basin (to the north of WPSH) and the north of Bay of Bengal (to the west of WPSH) during persistent and intense rain events. In the basin, Q1z begins to increase 3 days ahead of intense rainfall, maximizes 2 days later and then reduces gradually, but it changes little after precipitation ends, thus preventing the WPSH from moving northward. In the north of Bay of Bengal, 2 days ahead of strong rainfall over the basin, Q1z starts to increase and peaks 1 day after the rain occurs, leading to the westward extension of WPSH. Afterwards, Q1z begins declining and the WPSH makes its eastward retreat accordingly. Based on the complete vertical vorticity equation, in mid-troposphere, the vertical variation of heating in the basin is favorable to the increase of cyclonic vorticity north of WPSH, which counteracts the northward movement of WPSH and favors the persistence of rainbands over the basin. The vertical variation of heating in the north of Bay of Bengal is in favor of the increase of anti-cyclonic vorticity to the west of WPSH, which induces the westward extension of WPSH.

Get Citation+

WANG Li-juan, CHEN Xuan, GUAN Zhao-yong, et al. RELATIONSHIPS BETWEEN THE POSITION VARIATION OF THE WEST PACIFIC SUBTROPICAL HIGH AND THE DIABATIC HEATING DURING PERSISTENT INTENSE RAIN EVENTS IN YANGTZE-HUAIHE RIVERS BASIN [J]. Journal of Tropical Meteorology, 2012, 18(4): 528-536.

Export:

Article Metrics

RELATIONSHIPS BETWEEN THE POSITION VARIATION OF THE WEST PACIFIC SUBTROPICAL HIGH AND THE DIABATIC HEATING DURING PERSISTENT INTENSE RAIN EVENTS IN YANGTZE-HUAIHE RIVERS BASIN

Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science &Technology, Nanjing 210044 China

Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science &Technology, Nanjing 210044 China Wuhan Central Meteorological Observatory, Wuhan 430074 China

Jiangsu Institute of Meteorological Sciences, Nanjing 210008 China

Received Date: 2011-06-25

Rev Recd Date: 2012-08-17

Abstract: By using NCEP/NCAR daily reanalysis data and daily precipitation data of 740 stations in China, relationships between the position variation of the West Pacific subtropical high (WPSH) and the diabatic heating during persistent and intense rains in the Yangtze-Huaihe Rivers basin are studied. The results show that the position variation of WPSH is closely associated with the diabatic heating. There are strong apparent heating sources and moisture sinks in both the basin (to the north of WPSH) and the north of Bay of Bengal (to the west of WPSH) during persistent and intense rain events. In the basin, Q1z begins to increase 3 days ahead of intense rainfall, maximizes 2 days later and then reduces gradually, but it changes little after precipitation ends, thus preventing the WPSH from moving northward. In the north of Bay of Bengal, 2 days ahead of strong rainfall over the basin, Q1z starts to increase and peaks 1 day after the rain occurs, leading to the westward extension of WPSH. Afterwards, Q1z begins declining and the WPSH makes its eastward retreat accordingly. Based on the complete vertical vorticity equation, in mid-troposphere, the vertical variation of heating in the basin is favorable to the increase of cyclonic vorticity north of WPSH, which counteracts the northward movement of WPSH and favors the persistence of rainbands over the basin. The vertical variation of heating in the north of Bay of Bengal is in favor of the increase of anti-cyclonic vorticity to the west of WPSH, which induces the westward extension of WPSH.

HTML

Reference (21)

[1]	ZHOU T J, YU R C. Atmospheric water vapor transportassociated with typical anomalous summer rainfall patterns inChina [J]. J. Geophy. Res., 2005, 110, D08104, doi:10.1029/2004JD005413.
[2]	DING Yi-hui, HU Jian. The variation of the heat sources ineast China in the early summer of 1984 and their effects on thelarge-scale circulation in East Asia [J]. Adv. Atmos. Sci., 1988,5(2): 171-180.
[3]	HUANG Rong-hui, LI Wei-jing. Influence of the heatsource anomaly over the tropical western Pacific on thesubtropical high over East Asia[C]// Proceedings of theInternational Conference on the General Circulation of EastAsia, Chengdu, April 10-15, 1987: 40-51.
[4]	WU Guo-xiong, LIU Yi-min, LIU Ping. The effect ofspatially non-uniform heating on the formation and variation ofsubtropical high Ⅰ: Scale analysis [J]. Acta Meteor. Sinica,1999, 57(3): 257-263.
[5]	LIU Yi-min, WU Guo-xiong, LIU Hui. The effect ofspatially non-uniform heating on the formation and variation ofsubtropical high part Ⅲ: Condensation heating and South Asiahigh and western Pacific subtropical high [J]. Acta Meteor.Sinica, 1999, 57(5): 525-538.
[6]	LIU Huan-zhu, YAO Ming-ming. Numerical simulation onthe precipitation and variation of the location and intensity ofthe subtropical high [J]. J. Appl. Meteor. Sci., 2000, 11(4):385-391.
[7]	LIU Yi-min, WU Guo-xiong. Reviews on the study of thesubtropical anticyclone and new insights on some fundamentalproblems [J]. J. Appl. Meteor. Sci., 2000, 58(4): 500-512.
[8]	WANG Li-juan, GUAN Zhao-yong, HE Jin-hai. Theposition variation of the west Pacific subtropical high and itspossible mechanism [J]. J. Trop. Meteor., 2006, 12(2): 113-120.
[9]	KALNAY E, KANAMITSU M, KISTLER R, et al. TheNCEP /NCAR 40-year reanalysis project [J]. Bull. Amer.Meteor. Soc., 1996, 77(3): 437-471.
[10]	YANAI M, JOHNSON R H. Impacts of cumulusconvection on thermodynamic field, The Representation ofCumulus Convection in Numerical Models of the Atmosphere[M]. Emanuel K A, Raymond D J (Eds.), AmericanMeteorological Society, 1993: 39-62.
[11]	DING Yi-hui, WU Xiao-xi, MA Su-feng. A study of thesurface fluxes and structure of mixed layer during the Meiyurainfall over the Yangtze Huaihe river basin in 1991 [J]. ActaMeteor. Sinica, 1997, 55(3): 257-270
[12]	LIU Y M，WU G X, REN R C. Relationship between thesubtropical anticyclone and diabatic heating [J]. J. Climate,2004, 17: 682-698.
[13]	WEN Min, SHI Xiao-hui. Relationship between activity ofwest Pacific subtropical high and condensation latent heating insummer of 1998 [J]. Plateau Meteor., 2006, 25(4): 616-623.
[14]	YAO Xiu-ping, YU Yu-bin, LIU Huan-zhu. Characteristicsof the subtropical anticyclone during the abnormal rainfallperiod over the Huaihe river region 2003. [J]. J. Trop. Meteor.,2005, 21(4): 393-401.
[15]	YU Shi-hua, ZHAO Ku. The comparative analysis of theanomanously advancing and retreating of subtropical high inwestern Pacific Ocean [J]. J. Trop. Meteor., 1993, 9(1): 12-19.
[16]	QIAN W H, YANG S. Onset of the regional monsoon overSoutheast Asia [J]. Meteor. Atmos. Phy., 2000, 75: 29-38.
[17]	QIAN W H, LEE D K. Seasonal march of Asian summermonsoon [J]. Inter. J. Climatol., 2000, 20: 1371-1386.
[18]	WU Guo-xiong, Liu Huan-zhu. Complete form of verticalvorticity tendency equation and slantwise vorticitydevelopment [J]. J. Appl. Meteor. Sci., 1999, 57(1): 1-15.
[19]	REN Rong-cai, LIU Yi-min, WU Guo-xiong. Impact ofsouth Asia high on the short-term variation of the subtropicalanticyclone over western Pacific in July 1998. [J]. J. Appl.Meteor. Sci., 2007, 65(2): 183-197.
[20]	LIN Jian, BI Bao-gui, HE Jin-hai. Physical mechanismresponsible for western Pacific subtropical high variation andhot wave in southern China in July 2003 [J]. Chin. J. Atmos.Sci., 2005, 29(4): 594-599.
[21]	ZHOU T J, YU R C, ZHANG J, et al. Why the WesternPacific Subtropical High has Extended Westward since the Late1970s [J]. J. Climate, 22(8): 2199-2215.

RELATIONSHIPS BETWEEN THE POSITION VARIATION OF THE WEST PACIFIC SUBTROPICAL HIGH AND THE DIABATIC HEATING DURING PERSISTENT INTENSE RAIN EVENTS IN YANGTZE-HUAIHE RIVERS BASIN

Abstract:

References

Get Citation+

Share Article

Article Metrics

Proportional views

Manuscript History

Online:

通讯作者: 陈斌, bchen63@163.com