Abstract
A rainstorm caused by the coupling of the Tibetan Plateau vortex (TPV) and the Southwest China vortex (SWCV) in eastern Sichuan during 29 June–2 July 2013 is analyzed by using the conventional observed data and its time intensive observed data, the intensive observed data of SWCV scientific experiment during flood season. The results show that under the control of a large transverse trough in Eurasia region at mid-high latitude, the westerly flow in northern China leads TPV eastward movement. And SWCV moves northeastward. Finally, both of them merge to form a combined vortex (CBV) in Sichuan Basin resulting in heavy rainfall. The water vapor from both the Bay of Bengal and the South China Sea provides the sufficient humidity condition. The intensive observation clearly reveals the nascent states of TPV and SWCV, the movements and interactions, especially, the two vortices' merging process, and the effects of cold and warm advection, as well as the rainstorm. When the two vortices merge into CBV, cold tongue and warm flow meet and produce frontogenesis around the center of CBV. A frontogenetical area exists deeply from lower troposphere to upper troposphere with the south-positive and north-negative vertical structure, which is similar to front. The positive PV evidently developed both in the range and in the intensity with the stronger center at upper level, and the positive PV center located at the front of CBV has indicative significance for the vortex’s activities. And CBV has the same distributions of vorticity and temperature with SWCV and TPV, respectively. SWCV and TPV make different key contributions to the dynamic–thermodynamic property of CBV, but both of them have obvious influences on the divergence distribution of CBV. Furthermore, rainfall mainly distributes in the high areas of averaged temperature deviation gradient, and it is closely related to the joint influences of warm-moist air from the south and dry-cold air from the north. But, only using the conventional observed data, it is difficult to obtain the above useful understanding. So, augmenting intensive observation, improving scientific experiment, and focusing on fine study are much conducive for the meso-scale and small-scale weather systems such as SWCV and TPV, as well as its weather influences.
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References
Chen S, Dell’osso L (1984) Numerical prediction of the heavy rainfall vortex over the eastern Asia monsoon region. J Meteorol Soc Japan 62:730–747
Chen Z, Miao Q, Min WB (1998) Meso-scale structure analysis of a strong southwest China vortex. J Appl Meteorol Sci 9(3):273–282 (in Chinese)
Chen Z, Min WB, Miao Q, He GB (2004) A case study of the coupling of southwest China vortex and Tibetan Plateau vortex. Plateau Meteorol 23(1):75–80 (in Chinese)
Chen D, Li YQ, Huang RH (2007) Physical process of the southwest China vortex development and its effect on the rainfall in eastern Sichuan under the “saddle” pattern large-scale circulation background. Chin J Atmos Sci 31(2):185–201 (in Chinese)
Ertel H (1942) Ein neuer hydrodynamische wirbdsatz. Meteorol Z Braunschweig 59:277–281
Gu Q, Zhou CH, Qing Q, Zhang J (2008) A meso-scale analysis of a southwest China vortex rainstorm. Meteorol Mon 34(4):39–47 (in Chinese)
Huang C, Li GP (2007) Two cases preliminary analysis of Tibetan Plateau vortex structure based on the satellite observation. J Chengdu Univ Inf Technol 22(4):253–259 (in Chinese)
Lhasa Tibetan Project group of Qinghai-Tibetan Plateau meteorological research (1981) Research on the 500 hPa low vortex, wind shear on the Tibetan Plateau in summer. Science Press, Beijing (in Chinese)
Li G (2007) Tibetan Plateau dynamic meteorology, 2nd edn. China Meteorological Press, Beijing (in Chinese)
Li G, Liu HW (2006) An analysis of surface heat source forcing on the Tibetan Plateau Vortex. J Trop Meteorol 22(6):632–637 (in Chinese)
Li Y, Zhao XB, Deng B (2010) Intensive observation scientific experiment of the southwest vortex in the summer of 2010. Plateau Mt Meteorol Res 30(4):80–84 (in Chinese)
Li Y, Zhao XB, Zhang HL, Zhou CC (2011) Intensive observation scientific experiment of the southwest vortex in the summer of 2011. Plateau Mt Meteorol Res 31(4):7–11 (in Chinese)
Li Y, Zhao XB, Zhang HL, Zhou CC (2012) Intensive observation scientific experiment of the southwest vortex in the summer of 2012. Plateau Mt Meteorol Res 32(4):1–8 (in Chinese)
Liu F, Du WJ (1987) The formation and eastward movement of the Tibetan Plateau vortex inducing heavy rainfall in Sichuan Basin, the Tibetan Plateau effect on China weather in summer. China Meteorological Press, Beijing, pp 123–134 (in Chinese)
Lu J (1986) Generality of the Southwest Vortex. China Meteorological Press, Beijing (in Chinese)
Luo S (1992) Research on a few categories of synoptic system on the Tibetan Plateau and its adjacent areas. China Meteorological Press, Beijing (in Chinese)
Luo S, Wei L (1985) Dynamic analysis of the Tibetan Plateau effects on a westerly trough cutting off on May 1979. Plateau Meteorol 3(1):19–29 (in Chinese)
Miao Q (1999) A coupling interaction analysis of Tibetan Plateau synoptic system and the shallow synoptic system at leeward slope. Sichuan Meteorol 19(3):18–22 (in Chinese)
O’Brien J (1970) Alternative solutions to the classical vertical velocity problem. J Appl Meteorol 9:197–203
Shen R, Reiter ER, Bresch JF (1986) Numerical simulation of the development of vortices over the Qinghai-Xizang Plateau. Meteorol Atmos Phys 35:70–95
Tao S, Ding Y (1981) Observational evidence of the influence of the Qinghai—Xizang (Tibet) Plateau on the occurrence of heavy rain and severe convective storms in China. Bull Am Meteorol Soc 62:23–30
Wang B (1987) The development mechanism for Tibetan Plateau warm vortices. J Atmos Sci 44:2978–2994
Wang B, Orlanski I (1987) Study of a heavy rain vortex formed over the eastern flank of the Tibetan Plateau. Mon Weather Rev 115:1370–1393
Wang W, Ying-hwa K, Thomas TW (1993) A diabatically driven mesoscale vortex in the lee of the Tibetan Plateau. Mon Weather Rev 121:2542–2561
Wu R (1999) Modern synoptic theory. Higher Education Press, Beijing (in Chinese)
Wu G, Chen SJ (1985) The effect of mechanical forcing on the formation of a mesoscale vortex. Q J R Meteorol Soc 111:1049–1070
Xiang S, Li YQ, Dian L, Yang S (2013) An analysis of heavy precipitation caused by a retracing plateau vortex based on TRMM data. Meteorol Atmos Phys 122:33–45
Ye D, Gao YX (1979) Tibetan Plateau meteorology. Science Press, Beijing (in Chinese)
Ying-Hwa K, Cheng LS, Bao JW (1988) Numerical simulation of the 1981 Sichuan flood. Part I: evolution of a mesoscale southwest vortex. Mon Weather Rev 116:2481–2504
Zhang J, Zhu BZ (1988) Advances in Tibetan Plateau meteorology. Science Press, Beijing (in Chinese)
Zhao Y, Wang YH (2010) A case analysis of the southwest China vortex rainstorm induced by Tibetan Plateau vortex. Plateau Meteorol 29(4):819–831 (in Chinese)
Acknowledgments
The authors are very thankful to Dr. Michael L. Kaplan and the two anonymous reviewers whose constructive comments have improved the overall quality of the paper. This work was supported by the key project of the National Natural Science Foundation (No. 91337215), the National Natural Science Foundation of China (No. 41275051), the National Key Basic Research Development Program Project of China (No. 2012CB417202), and Special Fund for Meteorological Research in the Public Interest (GYHY201006053).
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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. Meteorol Atmos Phys 128, 373–399 (2016). https://doi.org/10.1007/s00703-015-0420-2
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DOI: https://doi.org/10.1007/s00703-015-0420-2