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    Diurnal Variation of Convective Activity and Precipitable Water around Ulaanbaator, Mongolia, and the Impact of Soil Moisture on Convective Activity during Nighttime

    Source: Monthly Weather Review:;2008:;volume( 136 ):;issue: 004::page 1401
    Author:
    Iwasaki, Hiroyuki
    ,
    Nii, Tomoki
    ,
    Sato, Tomonori
    ,
    Kimura, Fujio
    ,
    Nakagawa, Kiyotaka
    ,
    Kaihotsu, Ichirow
    ,
    Koike, Toshio
    DOI: 10.1175/2007MWR2062.1
    Publisher: American Meteorological Society
    Abstract: The diurnal variations of convective activity and precipitable water were investigated using a C-band airport radar and GPS receivers around Ulaanbaator (UB), Mongolia; this location was considered as an example of an arid region. The convective activity exhibited a pronounced diurnal cycle; it increased rapidly at 1100 local solar time (LST; 0300 UTC), reached the maximum at 1400 LST, and almost disappeared after 1900 LST. On the other hand, no diurnal variation of precipitable water could be observed, which implied that there was no considerable evapotranspiration, and the diurnal variation of the convective activity was irrelevant to the variation of water vapor. The reason why the deep convection could not develop at night is discussed using numerical modeling from the viewpoint of soil moisture. In the moist soil conditions assumed for humid simulations, an increase in the water vapor in the boundary layer due to evapotranspiration led to a potentially unstable condition that was sustained until night. Deep convection was formed at the southern foot of mountains where topographical convergence was expected. On the other hand, in the dry soil conditions assumed for the arid simulations, deep convection did not occur during nighttime even though topographical convergence was expected over the southern foot of the mountains. These features of dry soil conditions were consistent with the results from radar observations around UB. In other words, since the soil around UB is too dry in practice to sustain an unstable condition until night, the deep convection had to decay by night and could not be initiated at night.
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      Diurnal Variation of Convective Activity and Precipitable Water around Ulaanbaator, Mongolia, and the Impact of Soil Moisture on Convective Activity during Nighttime

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4207561
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    • Monthly Weather Review

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    contributor authorIwasaki, Hiroyuki
    contributor authorNii, Tomoki
    contributor authorSato, Tomonori
    contributor authorKimura, Fujio
    contributor authorNakagawa, Kiyotaka
    contributor authorKaihotsu, Ichirow
    contributor authorKoike, Toshio
    date accessioned2017-06-09T16:21:00Z
    date available2017-06-09T16:21:00Z
    date copyright2008/04/01
    date issued2008
    identifier issn0027-0644
    identifier otherams-66246.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207561
    description abstractThe diurnal variations of convective activity and precipitable water were investigated using a C-band airport radar and GPS receivers around Ulaanbaator (UB), Mongolia; this location was considered as an example of an arid region. The convective activity exhibited a pronounced diurnal cycle; it increased rapidly at 1100 local solar time (LST; 0300 UTC), reached the maximum at 1400 LST, and almost disappeared after 1900 LST. On the other hand, no diurnal variation of precipitable water could be observed, which implied that there was no considerable evapotranspiration, and the diurnal variation of the convective activity was irrelevant to the variation of water vapor. The reason why the deep convection could not develop at night is discussed using numerical modeling from the viewpoint of soil moisture. In the moist soil conditions assumed for humid simulations, an increase in the water vapor in the boundary layer due to evapotranspiration led to a potentially unstable condition that was sustained until night. Deep convection was formed at the southern foot of mountains where topographical convergence was expected. On the other hand, in the dry soil conditions assumed for the arid simulations, deep convection did not occur during nighttime even though topographical convergence was expected over the southern foot of the mountains. These features of dry soil conditions were consistent with the results from radar observations around UB. In other words, since the soil around UB is too dry in practice to sustain an unstable condition until night, the deep convection had to decay by night and could not be initiated at night.
    publisherAmerican Meteorological Society
    titleDiurnal Variation of Convective Activity and Precipitable Water around Ulaanbaator, Mongolia, and the Impact of Soil Moisture on Convective Activity during Nighttime
    typeJournal Paper
    journal volume136
    journal issue4
    journal titleMonthly Weather Review
    identifier doi10.1175/2007MWR2062.1
    journal fristpage1401
    journal lastpage1415
    treeMonthly Weather Review:;2008:;volume( 136 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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