Abstract
The mechanisms of the propagation and maintenance of the South Asian jet wave train are investigated in this study by examining the eddy kinetic energy (EKE) balance along the wave train. The intensity and evolution of the disturbances along the wave train can be well represented by the variation of EKE centers. The east-to-west discrepancy in the intensity of EKE centers indicates the wave train is not only maintained by the waveguide effect of the jet stream, but also fueled and damped by other physical processes along the wave train. It is found that both baroclinic and barotropic conversions are key energy sources during the lifespan of the wave train, characterized by regional differences. They evolve with the eddies and are offset mainly by energy exported by the ageostrophic geopotential fluxes after the peak of the eddies. They are strong upstream of the wave train, as extremely strong cooling/warming advection appears behind/ahead of the trough over the eastern Mediterranean Sea-Middle East where abnormal descent/ascent occurs, and potential energy is transformed into kinetic energy. As this trough tilts southwestward, kinetic energy can be converted from the mean flow to eddies on the north flank of the South Asian jet. Strong dissipation occurs over the Middle East, which might be responsible for the relatively weaker EKE centers downstream. Over China, the eddy is fueled by strong barotropic conversion again, as a result of the northward shift of the jet axis.
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References
Branstator G (2002) Circumglobal teleconnections, the jet stream waveguide, and the North Atlantic Oscillation. J Clim 15:1893–1910
Chen H, Zhang W, Zhou B, Teng F, Zhang J, Zhou Y (2019) Impact of nonuniform land surface warming on summer anomalous extratropical cyclone activity over East Asia. J Geophys Res Atmos 124(19):10306–10320. https://doi.org/10.1029/2018JD030165
Ding F, Li C (2017) Subtropical westerly jet waveguide and winter persistent heavy rainfall in south China. J Geophys Res 122:7385–7400. https://doi.org/10.1002/2017JD026530
Harada Y et al (2016) The JRA-55 reanalysis: representation of atmospheric circulation and climate variability. J Meteorol Soc Jpn Ser II 94:269–302. https://doi.org/10.2151/jmsj.2016-015
Hoskins BJ, Ambrizzi T (1993) Rossby wave propagation on a realistic longitudinally varying flow. J Atmos Sci 50:1661–1671. https://doi.org/10.1175/1520-0469(1993)050,1661:RWPOAR.2.0.CO;2
Hu KM, Huang G, Wu RG, Wang L (2018) Structure and dynamics of a wave train along the wintertime Asian jet and its impact on East Asian climate. Clim Dyn 51:4123–4137. https://doi.org/10.1007/s00382-017-3674-1
Huang SJ, Li XZ, Wen ZP, Chen RD (2020) Characteristics and possible sources of the intraseasonal South Asian jet wave train in boreal winter. J Clim 33:10523
Kobayashi C, Iwasaki T (2016) Brewer–Dobson circulation diagnosed from JRA-55. J Geophys Res Atmos 121:1493–1510. https://doi.org/10.1002/2015JD023476
Kobayashi S et al (2015) The JRA-55 reanalysis: general specifications and basic characteristics. J Meteorol Soc Jpn 93:5–48. https://doi.org/10.2151/jmsj.2015-001
Li C, Sun JL (2015) Role of the subtropical westerly jet waveguide in a southern China heavy rainstorm in December 2013. Adv Atmos Sci 32:601–612. https://doi.org/10.1007/s00376-014-4099-y
Li XZ, Chen YQD, Zhou W (2017) Response of winter moisture circulation to the India–Burma trough and its modulation by the South Asian waveguide. J Clim 30:1197–1210
Li XZ, Wen ZP, Huang WR (2020) Modulation of South Asian Jet wave train on the extreme winter precipitation over Southeast China: comparison between 2015/2016 and 2018/2019. J Clim 33:4065–4081
Nakamura H, Tanaka M, Wallace JM (1987) Horizontal structure and energetics of Northern Hemisphere wintertime teleconnection patterns. J Atmos Sci 44:3377–3391. https://doi.org/10.1175/1520-469(1987)044%3c3377:HSAEON%3e2.0.CO;2
North GR, Bell TL, Cahalan RF, Moeng FJ (1982) Sampling errors in the estimation of empirical orthogonal functions. Mon Weather Rev 110:699–706
Orlanski I, Chang EKM (1993) Ageostrophic geopotential fluxes in downstream and upstream development of baroclinic waves. J Atmos Sci 50:212–225. https://doi.org/10.1175/1520-0469(1993)050%3c0212:AGFIDA%3e2.0.CO;2
Orlanski I, Katzfey J (1991) The life cycle of a cyclone wave in the Southern Hemisphere. Part I: eddy energy budget. J Atmos Sci 48(17):1972–1998. https://doi.org/10.1175/1520‐0469(1991)048%3c1972:TLCOAC%3e2.0.CO;2
Orlanski I, Sheldon J (1995) Stages in the energetics of baroclinic systems. Tellus A 47:605–628
Peixoto JP, Oort AH (1991) Physics of climate. Springer, New York
Schubert SD (1986) The structure, energetics, and evolution of the dominant frequency-dependent three-dimensional atmospheric modes. J Atmos Sci 43:1210–1237. https://doi.org/10.1175/15200469(1986)043%3c1210:TSEAEO%3e2.0.CO;2
Simmons AJ, Wallace JM, Branstator GW (1983) Barotropic wave propagation and instability, and atmospheric teleconnection patterns. J Atmos Sci 40:1363–1392. https://doi.org/10.1175/1520-0469(1983)040,1363:BWPAIA.2.0.CO;2
Song J, Li CY, Zhou W (2014) High and low latitude types of the downstream influences of the North Atlantic Oscillation. Clim Dyn 42:1097–1111. https://doi.org/10.1007/s00382-013-1844-3
Suo MQ, Ding YH, Wang ZY (2008) Relationship between Rossby wave propagation in southern branch of westerlies and the formation of the southern branch trough in wintertime (in Chinese). J Appl Meteorol Sci 19:731–740
Watanabe M (2004) Asian jet waveguide and a downstream extension of the North Atlantic Oscillation. J Clim 17:4674–4691
Wirth V, Riemer M, Chang EKM, Martius O (2018) Rossby wave packets on the mid-latitude waveguide: a review. Mon Weather Rev 146:1965–2001
Acknowledgements
This work is jointly supported by the National Natural Science Foundation of China (Project no. 41775043), National Key Research and Development Programs of China (Project nos. 2019YFC1510400 and 2016YFA0600601), and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies (Grant 2020B1212060025).
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Li, X. Maintenance of the South Asian jet wave train: eddy kinetic energy balance. Clim Dyn 57, 687–700 (2021). https://doi.org/10.1007/s00382-021-05735-7
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DOI: https://doi.org/10.1007/s00382-021-05735-7