Vol.31, NO.5, 2020
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Article Navigation >  Journal of Applied Meteorological Science  > 2020  >  31(5): 556-569
Gao Songying, Zhao Tingting, Song Lili, et al. Comparison of development mechanisms of two cyclones affecting Northeast China. J Appl Meteor Sci, 2020, 31(5): 556-569. DOI:  10.11898/1001-7313.20200504.
Citation: Gao Songying, Zhao Tingting, Song Lili, et al. Comparison of development mechanisms of two cyclones affecting Northeast China. J Appl Meteor Sci, 2020, 31(5): 556-569. DOI:  10.11898/1001-7313.20200504.
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Comparison of Development Mechanisms of Two Cyclones Affecting Northeast China

DOI: 10.11898/1001-7313.20200504
  • 1.

    Dandong Meteorological Observatory of Liaoning Province, Dandong 118000

  • 2.

    Liaoyang Meteorological Observatory of Liaoning Province, Liaoyang 111000

  • 3.

    Shenyang Institute of Atmospheric Environment, CMA, Shenyang 110166

  • Received Date: 2020-01-09
  • Rev Recd Date: 2020-04-20
  • Publish Date: 2020-09-30
    Abstract
  • Two cyclones (C304 and C502) generated in the Jianghuai Basin on 3-5 March 2007 and 2-3 May 2016, affect the northeast region in a similar way. However, their intensities are different. The development of C304 is strong whereas that of C502 is explosive. Based on NCEP FNL analysis data and conventional data, their development dynamics are comparatively analyzed, through diagnosis of vorticity advection, temperature advection, moist potential vorticity and frontogenesis function, combining with the circulations of high and low altitudes. The result shows that the vorticity factor and thermal factor play roles in deepening cyclone development and guiding cyclone movement. There are strong cold and warm temperature advections at low attitudes in the process of the strong evolution of C304. High-level positive vorticity advection located above the ground cyclone provides high-level divergence field. During the explosive development of C502, cold and warm advections are inconspicuous. Highly positive vorticity advection is located in front of the high-attitude trough. The development of high-level closed circulation is promoted by the high-level positive vorticity advection. As for C304, strong frontogenesis and frontolyzes symmetrically develop on the lower troposphere, whereas the baroclinicity of C502 is inconspicuous. Positive moist potential vorticities strongly develop in the upper and lower troposphere unusually. C304 vorticity increases mainly in the lower troposphere, however, C502 vorticity increases mainly in the upper troposphere where the high-humidity vortex tongue develops drooping and merges with the troposphere below the positive wet-position vortex column. Two cyclones develop with coexistence of two high-level jets, non-latitude jet and the anticyclonic curved circulation. Southerly and northerly airflows are established in the background of the cyclonic circulation at 850 hPa. C304 is located on the left front of the southerly airstream, and C502 is located between the southerly and northerly airstreams. Under the effect of low-level intensity convergence and high-level intensity scattering, the vertical ascent motion of C304 increases in lower to upper middle troposphere above the ground cyclone center. Under the strong high-level intensity scattering and weak low-level convergence, the vertical ascent movement of C502 occurs on both sides of the ground cyclone center and middle troposphere. Low-level baroclinic forcing is the main starting development mechanism of C304, and high-level vortex downward transmission is the main mechanism of C502 development.
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  • Fig. 1  The diagram of cyclone movement path

    (tracks of C304 in the strong development period and C502 in the explosive development period are highlighted in bold)

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    Fig. 2  Time series of cyclone center sea-level pressure of C304 from 3 Mar to 4 Mar in 2007 and C502 from 2 May to 3 May in 2016

    (the part in bold is the period of cyclone over sea)

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    Fig. 3  200 hPa positive vortic advection(the shaded), 925 hPa temperature advection(the red contour is warm advection no less than 10, the green contour is cold advection no more than -10, unit:10-5 K·s-1) and 200 hPa potential height(the black contour, unit:dagpm) of C304 from 3 Mar to 4 Mar in 2007 (the brown solid line is slot line, the black dot indicates the cyclone center location)

    (a)1800 UTC 3 Mar, (b)0600 UTC 4 Mar, (c)1800 UTC 4 Mar

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    Fig. 4  300 hPa positive vortic advection(the shaded), 925 hPa temperature advection(the red contour is warm advection no less than 10, the green contour is cold advection no more than -10, unit:10-5 K·s-1) and 300 hPa potential height(the black contour, unit:dagpm) of C502 from 2 May to 3 May in 2016 (the brown solid line is slot line, the black dot indicates the cyclone center location, D indicates low pressure center)

    (a)0600 UTC 2 May, (b)1800 UTC 2 May, (c)0600 UTC 3 May

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    Fig. 5  The zonal section of frontal function(the black line, unit:10-10 K·m-1·s-1) and vertical velocity(the shaded) along centers of C304 and C502 (the black triangle indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0600 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 1800 UTC 2 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint

    Fig. 6  The zonal section of moist potential vorticity(the solid line for positive moist potential vorticity, the dotted line for negative moist potential vorticity, unit:PVU)) along centers of C304 and C502 (the black triangle indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0600 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 1800 UTC 2 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint

    Fig. 7  The meridional section of moist potential vorticity(the solid line for positive moist potential vorticity, the dotted line for negative moist potential vorticity, unit:PVU)) along centers of C304 and C502 (the black triangle indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0600 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 1800 UTC 2 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint

    Fig. 8  200 hPa wind speed(the solid line, unit:m·s-1), wind vector(unit:m·s-1)and positive divergence(the shaded) (the solid arrow line is jet stream at 200 hPa, the black dot indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0600 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 1800 UTC 2 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint

    Fig. 9  The zonal section of zonal wind(the solid line for west wind, the dotted line for east wind, unit:m·s-1) and vertical velocity(the shaded) along centers of C304 and C502(the black triangle indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0000 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 0000 UTC 3 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint

    Fig. 10  The meridional section of zonal wind(the solid line for west wind, the dotted line for east wind, unit:m·s-1) and vertical velocity(the shaded) along centers of C304 and C502 (the black triangle indicates the cyclone center location)

    (a)C304 at 1800 UTC 3 Mar 2007, (b)C304 at 0000 UTC 4 Mar 2007, (c)C304 at 1800 UTC 4 Mar 2007, (d)C502 at 0600 UTC 2 May 2016, (e)C502 at 0000 UTC 3 May 2016, (f)C502 at 0600 UTC 3 May 2016

    DownLoad: Full-Size Img PowerPoint
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    • Received : 2020-01-09
    • Accepted : 2020-04-20
    • Published : 2020-09-30
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