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    On the Mechanism of the Monsoonal Mid-Tropospheric Cyclone Formation

    Source: Journal of the Atmospheric Sciences:;1978:;Volume( 035 ):;issue: 008::page 1473
    Author:
    Brode, Roger W.
    ,
    Mak, Mankin
    DOI: 10.1175/1520-0469(1978)035<1473:OTMOTM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The radiosonde data collected prior to the development of a well-documented mid-tropospheric cyclone (MTC) over the west coast of India is used to determine the actual basic state. Such observed basic state is in turn used as the basis of a general quasi-geostrophic instability eigenvalue analysis, whereby one can check whether or not the hypothesis suggested in Mak's (1975) analysis is relevant in a real setting. We will discuss the degree of similarities and differences between the observed basic state and the idealized basic state. The incompleteness of Mak?s analysis is noted and a supplementary analysis is given. The results using the observed state show that there does exist a dominantly most unstable mode which in its overall structure and characteristics resembles that of the observed MTC. This lends further support to the idea that MTC initially arises from a baroclinic instability of the broad southwest monsoonal flow, of which the direction as well as the magnitude vary significantly with height. The energetics of this genesis mechanism are clarified. The dynamical roles of each element in this basic state are also investigated. The main shortcomings of the model results are that the growth rate is somewhat too small and the level of maximum intensity of the disturbance is somewhat too low. Such discrepancy strongly suggests the plausible importance of moist convection.
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      On the Mechanism of the Monsoonal Mid-Tropospheric Cyclone Formation

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    contributor authorBrode, Roger W.
    contributor authorMak, Mankin
    date accessioned2017-06-09T14:20:17Z
    date available2017-06-09T14:20:17Z
    date copyright1978/08/01
    date issued1978
    identifier issn0022-4928
    identifier otherams-17531.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4153436
    description abstractThe radiosonde data collected prior to the development of a well-documented mid-tropospheric cyclone (MTC) over the west coast of India is used to determine the actual basic state. Such observed basic state is in turn used as the basis of a general quasi-geostrophic instability eigenvalue analysis, whereby one can check whether or not the hypothesis suggested in Mak's (1975) analysis is relevant in a real setting. We will discuss the degree of similarities and differences between the observed basic state and the idealized basic state. The incompleteness of Mak?s analysis is noted and a supplementary analysis is given. The results using the observed state show that there does exist a dominantly most unstable mode which in its overall structure and characteristics resembles that of the observed MTC. This lends further support to the idea that MTC initially arises from a baroclinic instability of the broad southwest monsoonal flow, of which the direction as well as the magnitude vary significantly with height. The energetics of this genesis mechanism are clarified. The dynamical roles of each element in this basic state are also investigated. The main shortcomings of the model results are that the growth rate is somewhat too small and the level of maximum intensity of the disturbance is somewhat too low. Such discrepancy strongly suggests the plausible importance of moist convection.
    publisherAmerican Meteorological Society
    titleOn the Mechanism of the Monsoonal Mid-Tropospheric Cyclone Formation
    typeJournal Paper
    journal volume35
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1978)035<1473:OTMOTM>2.0.CO;2
    journal fristpage1473
    journal lastpage1484
    treeJournal of the Atmospheric Sciences:;1978:;Volume( 035 ):;issue: 008
    contenttypeFulltext
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