A Synchronous Variation Process of Tibetan Plateau Vortex and Southwest Vortex

Huang Honghui; Li Lun

doi:10.11898/1001-7313.20230406

Vol.34, NO.4, 2023

Turn off MathJax

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2023 > 34(4): 451-462

Huang Honghui, Li Lun. A synchronous variation process of Tibetan Plateau vortex and southwest vortex. J Appl Meteor Sci, 2023, 34(4): 451-462. DOI: 10.11898/1001-7313.20230406.

Citation:

Huang Honghui, Li Lun. A synchronous variation process of Tibetan Plateau vortex and southwest vortex. J Appl Meteor Sci, 2023, 34(4): 451-462. DOI: 10.11898/1001-7313.20230406.

Huang Honghui, Li Lun. A synchronous variation process of Tibetan Plateau vortex and southwest vortex. J Appl Meteor Sci, 2023, 34(4): 451-462. DOI: 10.11898/1001-7313.20230406.

Citation:

Huang Honghui, Li Lun. A synchronous variation process of Tibetan Plateau vortex and southwest vortex. J Appl Meteor Sci, 2023, 34(4): 451-462. DOI: 10.11898/1001-7313.20230406.

PDF( 6777 KB)

A Synchronous Variation Process of Tibetan Plateau Vortex and Southwest Vortex

DOI: 10.11898/1001-7313.20230406

Huang Honghui¹,
Li Lun^{1, 2
,
,}

1.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044

Received Date: 2023-02-14
Rev Recd Date: 2023-04-17
Publish Date: 2023-07-31

Abstract

Abstract

The synchronous variation of Tibetan Plateau vortex (TPV) and southwest vortex (SWV) is an important way to trigger heavy precipitation in southwest and eastern China. However, the physical process and mechanism of the coordinated change of two vortices are still unclear. A synchronous variation process of the TPV and SWV during the super-strong and super-long Meiyu period in 2020 (during 1-4 June of 2020) is selected to analyze the evolution characteristics of the strength and structure corresponding to the special time node (T1-T5) when two vortices coexist, as well as the potential vorticity budget with the data including the fifth-generation European Centre for Medium-Range Weather Forecasts atmospheric reanalysis (ERA5) hourly data and the precipitation observations. It's found that during the period T1-T2, TPV moves eastward on the Tibetan Plateau. When the SWV is generated (T1), it is far away from the TPV, and it is considered that two vortices have no interaction at that time. At the time of T3, when the TPV moves to the lower slope terrain on the eastern side of the Tibetan Plateau, its intensity is significantly weakened. Also at that monment, the TPV begins to change in coordination with the SWV. During T4-T5, two vortices strengthen and continue to change synchronously, and then merge into cyclonic circulation on their east side. Combined with the intensity changes of two vortices, the TPV and SWV with non-overlapping horizontal positions can also undergo synchronous variations, when their characteristics of intensity changes are roughly similar. From the analysis results of the potential vorticity diagnostic equation, two vortices have different evolution mechanisms before the synchronous variation, but their evolution mechanisms are basically the same when the synchronous variation occurs. It can be concluded that, when there is no synchronous variation (T1-T2), the TPV mainly relies on the heating field to maintain the eastward movement, and the SWV is maintained by the horizontal potential vorticity flux divergence. When the two vortices change synchronously (T3-T5), their intensity changes are similar, and the evolution mechanisms of them are consistent. The maintenance of two vortices mainly depends on the horizontal potential vorticity flux divergence, followed by the heating field.
- Tibetan Plateau vortex;
- southwest vortex;
- synchronous variation

FullText(HTML)

References(32)

Figures and Tables

图 1 2020年6月1日23:00—4日09:00高原低涡和西南涡移动轨迹(圆点代表高原低涡，三角代表西南涡，绿色表示高原低涡与西南涡共存时各自的轨迹，红色三角为西南涡生成位置, 橙色线表示青藏高原，下同) (a)及强度随时间变化(b)

Fig. 1 Trajectory (dots denote the TPV, triangles denote the SWV, green lines denote trajectories of the TPV and the SWV, the red triangle denotes the genesis location of the SWV, the orange line denotes the Tibetan Plateau, similarily hereinafer) (a) and intensity(b) of the TPV and the SWV from 2300 UTC 1 Jun to 0900 UTC 4 Jun in 2020

DownLoad: Full-Size Img PowerPoint

图 2 T1—T5时刻200 hPa位势高度(等值线，单位：gpm) 和全风速(阴影)、500 hPa位势高度(等值线，单位：gpm) 和风场(矢量)、整层水汽通量(矢量) 及水汽通量散度(阴影)

(红线分别代表南亚高压(200 hPa)和副热带高压(500 hPa)北界位置)

Fig. 2 200 hPa potential height (isolines, unit: gpm) and wind speed (the shaded), 500 hPa potential height (isolines, unit: gpm) and wind (the vector), vertically integrated water vapor flux (the vector) and the water vapor flux divergence (the shaded) at T1-T5

(red isolines denote the northern boundary of the South Asia high(200 hPa) and the subtropical high(500 hPa))

DownLoad: Full-Size Img PowerPoint

图 3 高原低涡涡度(暖色等值线；单位：10^-5 s^-1)、散度(填色) 垂直速度(蓝色等值线，单位：Pa·s^-1) 的经向、纬向垂直剖面图及500 hPa平面图

Fig. 3 Meridional and zonal vertical profiles of vorticity (warm isolines, unit: 10^-5 s^-1), divergence (the shaded) and vertical velocity (blue isolines, unit: Pa·s^-1) with horizontal distribution at 500 hPa for the TPV

DownLoad: Full-Size Img PowerPoint

图 4 同图 3，但为西南涡及700 hPa平面图

Fig. 4 The same as in Fig. 3, but for the SWV with horizontal distribution at 700 hPa

DownLoad: Full-Size Img PowerPoint

图 5 高原低涡500 hPa位涡(阴影) 及500 hPa位涡水平、垂直位涡通量散度、加热场所引起的位涡倾向(等值线, 单位：PVU)

Fig. 5 500 hPa potential vorticity of the TPV (the shaded) and 500 hPa PV tendency (isolines, unit: PVU) caused by the horizontal and vertical potential vorticity flux divergence as well as the heating field

DownLoad: Full-Size Img PowerPoint

图 6 同图 5，但为西南涡的700 hPa位涡

Fig. 6 The same as in Fig. 5, but for the SWV at 700 hPa

DownLoad: Full-Size Img PowerPoint

References

[1]	Ye D Z, Gao Y X. Qinghai-Xizang Plateau Meteorology. Beijing: Science Press, 1979.
[2]	Chang Y, Guo X L, Tang J, et al. Microphysical characteristics and precipitation formation mechanisms of convective clouds over the Tibetan Plateau. J Appl Meteor Sci, 2021, 32(6): 720-734. doi: 10.11898/1001-7313.20210607
[3]	Chen J Q, Shi X H. Possible Effects of the difference in atmospheric heating between the Tibetan Plateau and the Bay of Bengal on spatiotemporal evolution of rainstorms. J Appl Meteor Sci, 2022, 33(2): 244-256. doi: 10.11898/1001-7313.20220210
[4]	Wang H, Li Y, Wen Y R. Observational characteristics of a hybrid severe convective event in the Sichuan-Tibet Region. J Appl Meteor Sci, 2021, 32(5): 567-579. doi: 10.11898/1001-7313.20210505
[5]	Zhao P, Yuan Y. Characteristics of a plateau vortex precipitation event on 14 July 2014. J Appl Meteor Sci, 2017, 28(5): 532-543. doi: 10.11898/1001-7313.20170502
[6]	Lhasa Group for Tibetan Plateau Meteorology Research. Research of 500 hPa Vortices and Shear Lines over the Tibetan Plateau in Summer. Beijing: Science Press, 1981.
[7]	Luo S W, He M L, Liu X D. The study on Tibetan Plateau vortex in summer. Chinese Science(Series B), 1993, 23(7): 778-784. https://www.cnki.com.cn/Article/CJFDTOTAL-JBXK199307015.htm
[8]	Yu S H, Xiao Y H, Gao W L. Cold air influence on the Tibetan Plateau vortex moving out of the plateau. J Appl Meteor Sci, 2007, 18(6): 737-747. http://qikan.camscma.cn/article/id/200706113
[9]	Ren S L, Fang X, Lu N M, et al. Recognition method of the Tibetan Plateau vortex based on meteoroloical satellite data. J Appl Meteor Sci, 2019, 30(3): 345-359. doi: 10.11898/1001-7313.20190308
[10]	Lin J L, Li Y, Liu L S. A heavy precipitation process over the Tibetan Plateau under the joint effects of a tropical cyclone and vortex. J Appl Meteor Sci, 2023, 34(2): 166-178. doi: 10.11898/1001-7313.20230204
[11]	Lu J H. Outline of Southwest Vortex. Beijing: China Meteorological Press, 1986.
[12]	Li G P. Dynamic Meteorology of the Qinghai-Tibet Plateau. Beijing: China Meteorological Press, 2007.
[13]	Chen Q Z, Huang Y W, Wang Q W, et al. The statistical study of the southwest vortexes during 1990-2004. Journal of Nanjing University(Natural Sciences), 2007, 43(6): 633-642. https://www.cnki.com.cn/Article/CJFDTOTAL-NJDZ200706007.htm
[14]	Hao L P, Deng J, Li G P, et al. Characteristics of GPS vapor in a persistent heavy rainfall related to southwest vortex. J Appl Meteor Sci, 2013, 24(2): 230-239. http://qikan.camscma.cn/article/id/20130211
[15]	Chen Y R, Li Y Q, Zhang T L. Cause analysis on eastward movement of southwest China vortex and its induced heavy rainfall in South China. Advances in Meteorology, 2015. DOI: 10.1155/2015/481735.
[16]	Jiao M Y, Li C, Li Y X. Mesoscale analyses of a Sichuan heavy rainfall. J Appl Meteor Sci, 2005, 16(5): 699-704. http://qikan.camscma.cn/article/id/20050591
[17]	Miao Q, Liu B, Yuan L X. Characteristic analysis of coupling interaction between Tibetan Plateau weather system and leeward slope shallow weather system. Plateau and Mountain Meteorology Research, 1999, 9(3): 18-22. https://www.cnki.com.cn/Article/CJFDTOTAL-SCCX199903003.htm
[18]	Chen Z M, Min W B, Miao Q, et al. A case study on coupling interaction between plateau and southwest vortexes. Plateau Meteor, 2004, 23(1): 75-80. https://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200401011.htm
[19]	Zhou C H, Gu Q Y, He G B. Diagnostic analysis of vorticity in a heavy rain event under interaction of plateau vortex and southwest vortex. Meteor Sci Technol, 2009, 37(5): 538-544. https://www.cnki.com.cn/Article/CJFDTOTAL-QXKJ200905007.htm
[20]	Zhou Y S, Yan L, Wu T Y. Comparative analysis of two rainstorm processes in Sichuan Province affected by Tibetan Plateau vortex and southwest vortex. Chinese J Atmos Sci, 2019, 43(4): 813-830. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXK201904009.htm
[21]	Pu X M, Bai A J. Analysis of formation mechanism of MCC heavy rain caused by interaction between plateau vortex and southwest vortex. J Meteor Sci, 2021, 41(1): 27-38. https://www.cnki.com.cn/Article/CJFDTOTAL-QXKX202101003.htm
[22]	Zhao Y C, Wang Y H. A case study on plateau vortex inducing southwest vortex and producing extremely heavy rain. Plateau Meteor, 2010, 29(4): 819-831. https://www.cnki.com.cn/Article/CJFDTOTAL-GYQX201004001.htm
[23]	Li L, Zhang R H, Wen M. Genesis of southwest vortex and its relation to Tibetan Plateau vortex. Quart J Roy Meteor Soc, 2017, 143: 2556-2566.
[24]	Qiu J Y, Li G P, Hao L P. Diagnostic analysis of potential vorticity on a heavy rain in Sichuan Basin under interaction between plateau vortex and southwest vortex. Plateau Meteor, 2015, 34(6): 1556-1565. https://www.cnki.com.cn/Article/CJFDTOTAL-GYQX201506005.htm
[25]	Liu X, Ma E, Cao Z, et al. Numerical study of a southwest vortex rainstorm process influenced by the eastward movement of Tibetan Plateau vortex. Advances in Meteorology, 2018. DOI: 10.1155/2018/9081910.
[26]	Cheng X, Li Y, Xu L. An analysis of an extreme rainstorm caused by the interaction of the Tibetan Plateau vortex and the Southwest China vortex from an intensive observation. Meteorology & Atmospheric Physics, 2016, 128: 373-399.
[27]	Liu X R, Li G P, Hu Z H, et al. Dynamic diagnosis of the strengthened southwest vortex coupling induced by the plateau vortex. J Meteor Sci, 2020, 40(3): 363-373. https://www.cnki.com.cn/Article/CJFDTOTAL-QXKX202003009.htm
[28]	Zhang G S, Mao J Y, Liu Y M, et al. PV perspective of impacts on downstream extreme rainfall event of a Tibetan Plateau vortex collaborating with a southwest China vortex. Adv Atmos Sci, 2021, 38(11): 1835-1851.
[29]	Wen B A. Calculation of physical quantities and its application in rainstorm analysis and forecast-Water vapor flux and water vapor flux divergence. Meteor Mon, 1980, 6(6): 36-38. https://www.cnki.com.cn/Article/CJFDTOTAL-QXXX198006018.htm
[30]	Li L, Zhang R H, Wen M. Diagnostic analysis of the evolution mechanism for a vortex over the Tibetan Plateau in June 2008. Adv Atmos Sci, 2011, 28(4): 797-808.
[31]	Ding Y H. The Diagnostic Analysis Methods of Synoptic Dynamics. Beijing: Science Press, 1989.
[32]	Yanai M, Esbensen S, Chu J H. Determination of bulk properties of tropical cloud clusters from large-scale heat and moisture budgets. J Atmos Sci, 1973, 30(4): 611-627.