Abstract
The formation mechanisms of the record-breaking rainfall event during the Dragon Boat Rainy Season (DBRS) of 2022 are comprehensively analyzed from the synoptic scale and the mesoscale perspectives. The extreme rainfall event is characterized by the highest rainfall amount since 1981, and an abnormal spatial distribution with much higher (lower) rainfall amount in the northern (southern) part of South China. The abnormal circulation and thermodynamic conditions are mainly responsible for the extreme rainfall. The favorite synoptic condition for rainfall is the combination of warm advection, frontal forcing, orographic lifting and low-level jet favor the convection development. The similar configurations repeatedly impact South China during the DBRS of 2022, causing multiple heavy rainfall events, leading to the extreme rainfall of the whole period. The abnormal moisture convergence together with the frontal zone, which is stronger than the climatology, results in the rainfall centers over the northern part of South China. 54.35% of the rainfall amount is related to mesoscale convective systems (MCSs) which mainly originate from four regions. The MCSs from the four regions are characterized by different formation peaks, spatial scales, lifetimes and propagations. The large-scale warm and moist air mass, the moistening caused by synoptic advection and the local diabatic heating are responsible for the increasing instability for the MCSs. The low-level jets play an important role in the formation of MCSs by providing moisture. The thermodynamic (dynamic) environmental conditions control the formation of MCSs in the afternoon (night).
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Data availability
The hourly rainfall observation data is obtained from http://data.cma.cn/ with approval by China Meteorological Administration. The FY-4A BT data can be downloaded from http://satellite.nsmc.org.cn/PortalSite/Data/Satellite.aspx with approval by the China Meteorological Administration. The ERA5 hourly data on pressure levels is available at https://doi.org/10.24381/cds.bd0915c6. The ERA5 hourly data on single levels is available at https://doi.org/10.24381/cds.adbb2d47.
References
Ai, Y., Li, W., Meng, Z., Li, J.: Life cycle characteristics of MCSs in middle east China tracked by geostationary satellite and precipitation estimates. Mon. Weather Rev. 144, 2517–2530 (2016). https://doi.org/10.1175/MWR-D-15-0197.1
Bao, M.: The statistical analysis of the persistent heavy rain in the last 50 years over China and their backgrounds on the large scale circulation. Chin. J. Atmos. Sci. (in Chinese) 31, 779–792 (2007). https://doi.org/10.3878/j.issn.1006-9895.2007.05.03
Bretherton, C.S., Peters, M.E., Back, L.E.: Relationships between water vapor path and precipitation over the tropical oceans. J. Clim. 17, 1517–1528 (2004). https://doi.org/10.1175/1520-0442(2004)017%3c1517:RBWVPA%3e2.0.CO,2
Chen, H., Zhao, S.: Heavy rainfalls in South China and related circulation during HUAMEX period. Chin. J. Atmos. Sci. (in Chinese) 28, 32–47 (2004). https://doi.org/10.3878/j.issn.1006-9895.2004.01.04
Chen, Y., Luo, Y., Liu, B.: General features and synoptic-scale environments of mesoscale convective systems over South China during the 2013–2017 pre-summer rainy seasons. Atmos. Res. 266, 105954 (2022). https://doi.org/10.1016/j.atmosres.2021.105954
Cheng, J., Zhao, Y., Zhi, R., Feng, G.: Meridional circulation dominates the record-breaking “Dragon Boat Water” rainfall over south China in 2022. Front. Earth Sci. 10, 1032313 (2023). https://doi.org/10.3389/feart.2022.1032313
Du, Y., Chen, G.: Climatology of low-level jets and their impact on rainfall over southern China during the early-summer rainy season. J. Clim. 32, 8813–8833 (2019). https://doi.org/10.1175/JCLI-D-19-0306.1
Du, Y., Zhang, Q., Chen, Y., Zhao, Y., Wang, X.: Numerical simulations of spatial distributions and diurnal variations of low-level jets in China during early summer. J. Clim. 27, 5747–5767 (2014). https://doi.org/10.1175/JCLI-D-13-00571.1
Feng, Z., Houze, R.A., Leung, L.R., Song, F., Hardin, J.C., Wang, J., Gustafson, W.I., Homeyer, C.R.: Spatiotemporal characteristics and large-scale environments of mesoscale convective systems east of the Rocky Mountains. J. Clim. 32, 7303–7328 (2019). https://doi.org/10.1175/JCLI-D-19-0137.1
Fu, S., Zhang, J., Luo, Y., Yang, W., Sun, J.: Energy paths that sustain the warm-sector torrential rainfall over South China and their contrasts to the frontal rainfall: A case study. Adv. Atmos. Sci. 39, 1519–1535 (2022). https://doi.org/10.1007/s00376-021-1336-z
Guo, Y., Du, Y., Lu, R., Feng, X., Li, J., Zhang, Y., Mai, Z.: The characteristics of mesoscale convective systems generated over the Yunnan-Guizhou Plateau during the warm seasons. Int. J. Climatol. 42, 7321–7341 (2022). https://doi.org/10.1002/joc.7647
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A., Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D., Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., De Chiara, G., Dahlgren, P., Dee, D., Diamantakis, M., Dragani, R., Flemming, J., Forbes, R., Fuentes, M., Geer, A., Haimberger, L., Healy, S., Hogan, R.J., Hólm, E., Janisková, M., Keeley, S., Laloyaux, P., Lopez, P., Lupu, C., Radnoti, G., de Rosnay, P., Rozum, I., Vamborg, F., Villaume, S., Thépaut, J.-N.: The ERA5 global reanalysis. Q. J. r. Meteorol. Soc. 146, 1999–2049 (2020). https://doi.org/10.1002/qj.3803
Houze, R. A. Mesoscale convective systems. Rev. Geophys., 42, RG4003 (2004). https://doi.org/10.1029/2004RG000150
Hu, Y., Du, Y., Luo, X.: Precipitation patterns during the “dragon boat water” in South China for the recent 49 years. Meteorol. Mon. (in Chinese) 39, 1031–1041 (2013). https://doi.org/10.7519/j.issn.1000-0526.2013.08.010
Kuo, Y.-H., Neelin, J.D., Mechoso, C.R.: Tropical convective transition statistics and causality in the water vapor–precipitation relation. J. Atmos. Sci. 74, 915–931 (2017). https://doi.org/10.1175/JAS-D-16-0182.1
Laing, A.G., Fritsch, J.M.: The large-scale environments of the global populations of mesoscale convective complexes. Mon. Wea. Rev. 128, 2756–2776 (2000). https://doi.org/10.1175/1520-0493(2000)128%3c2756:TLSEOT%3e2.0.CO;2
Li, X., Du, Y.: Statistical relationships between two types of heavy rainfall and low-level jets in South China. J. Clim. 34, 8549–8566 (2021). https://doi.org/10.1175/JCLI-D-21-0121.1
Lin, L., Wu, N., Huang, Z., Cai, A.: Causality analysis of infrequent dragon-boat precipitation in Guangdong province in 2008. Meteorol. Mon. (in Chinese) 35, 43–50 (2009). https://doi.org/10.7519/j.issn.1000-0526.2020.11.003
Liu, R., Sun, J., Chen, B.: Selection and classification of warm-sector heavy rainfall events over South China. Chin. J. Atmos. Sci. (in Chinese) 43, 119–130 (2019). https://doi.org/10.3878/j.issn.1006-9895.1803.17245
Liu, X., Luo, Y., Huang, L., Zhang, D.-L., Guan, Z.: Roles of double low-level jets in the generation of coexisting inland and coastal heavy rainfall over South China during the presummer rainy season. J. Geophys. Res. Atmos. 125, e2020JD032890 (2020). https://doi.org/10.1029/2020JD032890
Liu, H., Meng, Z., Zhu, Y., Huang, Y.: Convection initiation associated with a boundary layer convergence line over a real-world sharp vegetation-contrast area. Mon. Wea. Rev. 151, 1189–1212 (2023). https://doi.org/10.1175/MWR-D-22-0083.1
Luo, Y., Wang, H., Zhang, R., Qian, W., Luo, Z.: Comparison of rainfall characteristics and convective properties of monsoon precipitation systems over South China and the Yangtze and Huai River basin. J. Clim. 26, 110–132 (2013). https://doi.org/10.1175/JCLI-D-12-00100.1
Mai, Z., Fu, S., Sun, J.: Statistical features of two types of mesoscale convective systems (MCSs) generated over the eastern Tibetan Plateau during 16 consecutive warm seasons. Clim. Environ. Res. (in Chinese) 25, 385–398 (2020). https://doi.org/10.3878/j.issn.1006-9585.2019.19040
Mai, Z., Fu, S., Sun, J., Hu, L., Wang, X.: Key statistical characteristics of the mesoscale convective systems generated over the Tibetan Plateau and their relationship to precipitation and southwest vortices. Int. J. Climatol. 41, E875–E896 (2021). https://doi.org/10.1002/joc.6735
Maurer, V., Bischoff-Gauß, I., Kalthoff, N., Gantner, L., Roca, R., Panitz, H.-J.: Initiation of deep convection in the Sahel in a convection-permitting climate simulation for northern Africa: Deep convection in the Sahel. Q. J. r. Meteorol. Soc. 143, 806–816 (2017). https://doi.org/10.1002/qj.2966
Meng, Q., Yu, C.: Analysis of the June 2022 atmospheric circulation and weather. Meteorol. Mon. (in Chinese) 48, 1209–1216 (2022). https://doi.org/10.7519/j.issn.1000-0526.2022.080201
Meng, Y., Sun, J., Zhang, Y., Fu, S.: A 10-year climatology of mesoscale convective systems and their synoptic circulations in the southwest mountain area of China. J. Hydrometeorol. 22, 23–41 (2020). https://doi.org/10.1175/JHM-D-20-0167.1
Mu, J., Wang, J., Li, Z.: A study of environment and mesoscale convective systems of continuous heavy rainfall in the South of China in June 2005. Acta Meteorol. Sin. (in Chinese) 66, 437–451 (2008). https://doi.org/10.11676/qxxb2008.040
Ninomiya, K., Ikawa, M., Akiyama, T.: Long-lived medium-scale cumulonimbus cluster in Asian subtropical humid region. J. Meteorol. Soc. Japan Ser. II(59), 564–577 (1981). https://doi.org/10.2151/jmsj1965.59.4_564
Peters, J.M., Schumacher, R.S.: Objective categorization of heavy-rain-producing MCS synoptic yypes by rotated principal component analysis. Mon. Weather Rev. 142, 1716–1737 (2014). https://doi.org/10.1175/MWR-D-13-00295.1
Punkka, A.-J., Bister, M.: Mesoscale convective systems and their synoptic-scale environment in Finland. Weather Forecast. 30, 182–196 (2015). https://doi.org/10.1175/WAF-D-13-00146.1
Qian, W., Ai, Y., Leung, J.C.-H., Zhang, B.: Anomaly-based synoptic analysis and model product application for 2020 summer southern China rainfall events. Atmos. Res. 258, 105631 (2021). https://doi.org/10.1016/j.atmosres.2021.105631
Qian, W., Ai, Y., Chen, L., Li H.: Anomalous synoptic pattern of typical dragon boat precipitation process in Guangdong province. J. Trop. Meteorol. (in Chinese), 36, 433–443 (2020). https://doi.org/10.16032/j.issn.1004-4965.2020.040.
Reif, D.W., Bluestein, H.B.: A 20-year climatology of nocturnal convection initiation over the central and southern Great Plains during the warm season. Mon. Weather Rev. 145, 1615–1639 (2017). https://doi.org/10.1175/MWR-D-16-0340.1
Salio, P., Nicolini, M., Zipser, E.J.: Mesoscale convective systems over southeastern South America and their relationship with the South American low-level jet. Mon. Weather Rev. 135, 1290–1309 (2007). https://doi.org/10.1175/MWR3305.1
Schumacher, R.S., Johnson, R.H.: Organization and environmental properties of extreme-rain-producing mesoscale convective systems. Mon. Weather Rev. 133, 961–976 (2005). https://doi.org/10.1175/MWR2899.1
Sheng, B., Wang, H., Li, H., Wu, K., Li, Q.: Thermodynamic and dynamic effects of anomalous dragon boat water over South China in 2022. Weather Clim. Extremes 40, 100560 (2023). https://doi.org/10.1016/j.wace.2023.100560
Song, F., Feng, Z., Leung, L.R., Houze, R.A., Jr., Wang, J., Hardin, J., Homeyer, C.R.: Contrasting spring and summer large-scale environments associated with mesoscale convective systems over the US. Great Plains. J. Clim. 32, 6749–6767 (2019). https://doi.org/10.1175/JCLI-D-18-0839.1
Sun, J., Zhao, S.: A diagnosis and simulation study of a strong heavy rainfall in South China. Chin. J. Atmos. Sci. (in Chinese) 24, 381–392 (2000). https://doi.org/10.3878/j.issn.1006-9895.2000.03.10
Sun, J., Zhang, Y., Liu, R., Fu, S., Tian, F.: A review of research on warm-sector heavy rainfall in China. Adv. Atmos. Sci. 36, 1299–1307 (2019). https://doi.org/10.1007/s00376-019-9021-1
Sun, J., Zhao S.: A study of mesoscale convective systems and its environmental fields during the June 1994 record heavy rainfall of South China. Part I: A numerical simulation study of meso-β convective system inducing heavy rainfall. Chin. J. Atmos. Sci. (in Chinese), 26, 541–557 (2002). https://doi.org/10.3878/j.issn.1006-9895.2002.04.11
Trier, S.B., Parsons, D.B.: Evolution of environmental conditions preceding the development of a nocturnal mesoscale convective complex. Mon. Weather Rev. 121, 1078–1098 (1993). https://doi.org/10.1175/1520-0493(1993)121%3c1078:EOECPT%3e2.0.CO,2
Wang, D., Xia, R., Liu, Y.: A preliminary study of the flood causing rainstorm during the first rainy season in South China in 2008. Acta Meteorol. Sin. (in Chinese), 69, 137–148 (2011). https://doi.org/10.11676/qxxb2011.012
Wu, H., Du, Y., Qin, P.: Climate characteristics and variation of rainstorm in South China. Meteorol. Mon. (in Chinese) 37, 1262–1269 (2011). https://doi.org/10.7519/j.issn.1000-0526.2011.10.009
Wu, M., Luo, Y., Chen, F., Wong, W.K.: Observed link of extreme hourly precipitation changes to urbanization over coastal South China. J. Appl. Meteorol. Climatol. 58, 1799–1819 (2019). https://doi.org/10.1175/JAMC-D-18-0284.1
Wu, N., Wen, Z., Deng, J., Lin, L., Chen, G.: Advances in warm-sector heavy rainfall during the first rainy season in South China. J. Meteorol. Sci. (in Chinese) 40, 605–616 (2020). https://doi.org/10.3969/2020jms.0077
Wu, H., Li, C., Wang, D.: Analysis on characteristics and abnormal causes of dragon-boat precipitation in Guangdong in the past 55 years. J. Trop. Meteorol. (in Chinese), 33, 608–616 (2017). https://doi.org/10.16032/j.issn.1004-4965.2017.05.004.
Xia, R., Zhao, S., Sun, J.: A study of circumstances of meso-β-scale systems of strong heavy rainfall in warm sector ahead of fronts in South China. Chin. J. Atmos. Sci. (in Chinese) 30, 988–1008 (2006). https://doi.org/10.3878/j.issn.1006-9895.2006.05.26
Yang, X., Fei, J., Huang, X., Cheng, X., Carvalho, L.M.V., He, H.: Characteristics of mesoscale convective systems over China and its vicinity using geostationary satellite FY2. J. Clim. 28, 4890–4907 (2015). https://doi.org/10.1175/JCLI-D-14-00491.1
Yang, J., Zhang, Z., Wei, C., Lu, F., Guo, Q.: Introducing the new generation of Chinese geostationary weather satellites, Fengyun-4. Bull. Am. Meteorol. Soc. 98, 1637–1658 (2017). https://doi.org/10.1175/BAMS-D-16-0065.1
Yang, R., Zhang, Y., Sun, J., Li, J.: The comparison of statistical features and synoptic circulations between the eastward-propagating and quasi-stationary MCSs during the warm season around the second-step terrain along the middle reaches of the Yangtze River. Sci. China Earth Sci. 63, 1209–1222 (2020). https://doi.org/10.1007/s11430-018-9385-3
Zhang, Y., Sun, J., Yang, R., Ma, R.: Initiation and evolution of long-lived eastward-propagating mesoscale convective systems over the second-step terrain along Yangtze-Huaihe River valley. Adv. Atmos. Sci. 39, 763–781 (2022). https://doi.org/10.1007/s00376-022-1303-3
Zhao, Y., Li, Z., Xiao Z.: Comparison analysis of South China front and warm-area heavy rain systems in June 2006. Meteorol. Sci. Technol. (in Chinese), 36, 47–54 (2008). https://doi.org/10.19517/j.1671-6345.2008.01.011
Zheng, L., Sun, J., Zhang, X., Liu, C.: Organizational modes of mesoscale convective systems over central East China. Weather Forecast. 28, 1081–1098 (2013). https://doi.org/10.1175/WAF-D-12-00088.1
Zhu, L., Bai, L., Chen, G., Sun, Y. Q., Meng, Z.: Convection initiation associated with ambient winds and local circulations over a tropical island in South China. Geophys. Res. Lett., 48, e2021GL094382 (2021). https://doi.org/10.1029/2021GL094382
Acknowledgements
This work was supported by the National Key R&D Program of China (Grant No. 2019YFC1510400), the National Natural Science Foundation of China (Grant 42075002), and the National Key Scientific and Technological Infrastructure project “Earth System Numerical Simulation Facility” (EarthLab).
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Key Technologies Research and Development Program, 2019YFC1510400, JianHua Sun. National Natural Science Foundation of China, 42075002, Shenming Fu.
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Fu, Y., Sun, J., Wu, Z. et al. Formation Mechanisms of the Extreme Rainfall and Mesoscale Convective Systems over South China during the Dragon Boat Rainy Season of 2022. Asia-Pac J Atmos Sci (2024). https://doi.org/10.1007/s13143-024-00357-5
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DOI: https://doi.org/10.1007/s13143-024-00357-5