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    Quasi-Geostrophic Diagnosis of the Monsoon Depression of 5–8 July 1979

    Source: Journal of the Atmospheric Sciences:;1984:;Volume( 041 ):;issue: 004::page 538
    Author:
    Sanders, Frederick
    DOI: 10.1175/1520-0469(1984)041<0538:QGDOTM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Quasi-geostrophic diagnosis of the fields of vertical motion and streamfunction tendency, based on wind analysis, was undertaken for the monsoon depression of 5?8 July 1979, a uniquely well-observed case during Summer MONEX. Wind analysis, in terms of streamfunction and velocity potential, was performed for data averaged in three layers of equal pressure depth front 1000 to 100 mb. The thermal stratification near the depression above 850 mb was approximately moist-adiabatic. The wind analyses showed that the basic zonal currents, westerly in the lower troposphere and easterly in the middle levels, weakened as the depression formed. Central vorticity increased rapidly on 5?6 July to a magnitude three times the Coriolis parameter. The center tilted toward the southwest with elevation. The quasi-geostrophic omega-equation was solved at the interfaces between layers, for a range of stabilities from the full dry-adiabatic value to 1% of it. Ascent west of the center for the near-neutral stability was sufficient to account for the storm-scale average observed precipitation. Divergences for each layer were combined with vorticity advections to calculate the quasi-geostrophic streamfunction tendencies. The observed slow westward motion of the system was reasonably well accounted for, but the temporally increasing meridional slope of the system was somewhat exaggerated. The strong increase in central vorticity during development could not be accounted for by divergence arising from advections of temperature and vorticity.
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      Quasi-Geostrophic Diagnosis of the Monsoon Depression of 5–8 July 1979

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4154787
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    contributor authorSanders, Frederick
    date accessioned2017-06-09T14:24:32Z
    date available2017-06-09T14:24:32Z
    date copyright1984/02/01
    date issued1984
    identifier issn0022-4928
    identifier otherams-18748.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154787
    description abstractQuasi-geostrophic diagnosis of the fields of vertical motion and streamfunction tendency, based on wind analysis, was undertaken for the monsoon depression of 5?8 July 1979, a uniquely well-observed case during Summer MONEX. Wind analysis, in terms of streamfunction and velocity potential, was performed for data averaged in three layers of equal pressure depth front 1000 to 100 mb. The thermal stratification near the depression above 850 mb was approximately moist-adiabatic. The wind analyses showed that the basic zonal currents, westerly in the lower troposphere and easterly in the middle levels, weakened as the depression formed. Central vorticity increased rapidly on 5?6 July to a magnitude three times the Coriolis parameter. The center tilted toward the southwest with elevation. The quasi-geostrophic omega-equation was solved at the interfaces between layers, for a range of stabilities from the full dry-adiabatic value to 1% of it. Ascent west of the center for the near-neutral stability was sufficient to account for the storm-scale average observed precipitation. Divergences for each layer were combined with vorticity advections to calculate the quasi-geostrophic streamfunction tendencies. The observed slow westward motion of the system was reasonably well accounted for, but the temporally increasing meridional slope of the system was somewhat exaggerated. The strong increase in central vorticity during development could not be accounted for by divergence arising from advections of temperature and vorticity.
    publisherAmerican Meteorological Society
    titleQuasi-Geostrophic Diagnosis of the Monsoon Depression of 5–8 July 1979
    typeJournal Paper
    journal volume41
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1984)041<0538:QGDOTM>2.0.CO;2
    journal fristpage538
    journal lastpage552
    treeJournal of the Atmospheric Sciences:;1984:;Volume( 041 ):;issue: 004
    contenttypeFulltext
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