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    Simulation of Extratropical Synoptic-Scale Stratosphere–Troposphere Exchange Using a Coupled Chemistry GCM: Sensitivity to Horizontal Resolution

    Source: Journal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 017::page 2824
    Author:
    Kentarchos, A. S.
    ,
    Roelofs, G. J.
    ,
    Lelieveld, J.
    DOI: 10.1175/1520-0469(2000)057<2824:SOESSS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The transport of ozone between the stratosphere and troposphere has been studied with a coupled chemistry GCM (ECHAM4) for two horizontal resolutions (T30: 3.75° ? 3.75° and T63: 1.875° ? 1.875°). The meteorological conditions pertain to the first half of March 1996, when a large amplification of waves in the upper troposphere resulted in the development of two upper-level subtropical cyclonic vortices in the Northern Hemisphere over the Atlantic Ocean. The focus is on the sensitivity of the model simulations to the horizontal model resolution. A finer, more detailed structure was obtained for the calculated meteorological fields (especially the ?streamers? of high potential vorticity (PV) and low specific humidity associated with synoptic disturbances) when the higher resolution was applied. In quantitative terms, main differences were found in the upper-tropospheric PV values and the jet stream maxima (higher at T63). Overall, the higher-resolution results were in excellent agreement with European Centre for Medium-Range Weather Forecasts analysis fields (at T106 resolution: 1.125° ? 1.125°). Backward trajectory analysis provided complementary information on the history of air masses associated with vertical transports in the vicinity of the vortices. Modeled ozone concentrations show a pronounced increase in the upper troposphere, and their spatial and temporal evolution is in good agreement with the development of the cutoff lows (in both resolutions). However, the calculated concentrations increase with increasing resolution, while a stronger vertical mixing is evident at higher resolution, particularly in areas associated with tropopause folds. The finer resolution improved (overall) the simulation of vertical ozone profiles, but not very significantly. Finally, refinement of the horizontal resolution from T30 to T63 leads to a ?12% increase in the amount of stratospheric ozone transferred into the troposphere during the particular synoptic event.
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      Simulation of Extratropical Synoptic-Scale Stratosphere–Troposphere Exchange Using a Coupled Chemistry GCM: Sensitivity to Horizontal Resolution

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159160
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    contributor authorKentarchos, A. S.
    contributor authorRoelofs, G. J.
    contributor authorLelieveld, J.
    date accessioned2017-06-09T14:36:27Z
    date available2017-06-09T14:36:27Z
    date copyright2000/09/01
    date issued2000
    identifier issn0022-4928
    identifier otherams-22683.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159160
    description abstractThe transport of ozone between the stratosphere and troposphere has been studied with a coupled chemistry GCM (ECHAM4) for two horizontal resolutions (T30: 3.75° ? 3.75° and T63: 1.875° ? 1.875°). The meteorological conditions pertain to the first half of March 1996, when a large amplification of waves in the upper troposphere resulted in the development of two upper-level subtropical cyclonic vortices in the Northern Hemisphere over the Atlantic Ocean. The focus is on the sensitivity of the model simulations to the horizontal model resolution. A finer, more detailed structure was obtained for the calculated meteorological fields (especially the ?streamers? of high potential vorticity (PV) and low specific humidity associated with synoptic disturbances) when the higher resolution was applied. In quantitative terms, main differences were found in the upper-tropospheric PV values and the jet stream maxima (higher at T63). Overall, the higher-resolution results were in excellent agreement with European Centre for Medium-Range Weather Forecasts analysis fields (at T106 resolution: 1.125° ? 1.125°). Backward trajectory analysis provided complementary information on the history of air masses associated with vertical transports in the vicinity of the vortices. Modeled ozone concentrations show a pronounced increase in the upper troposphere, and their spatial and temporal evolution is in good agreement with the development of the cutoff lows (in both resolutions). However, the calculated concentrations increase with increasing resolution, while a stronger vertical mixing is evident at higher resolution, particularly in areas associated with tropopause folds. The finer resolution improved (overall) the simulation of vertical ozone profiles, but not very significantly. Finally, refinement of the horizontal resolution from T30 to T63 leads to a ?12% increase in the amount of stratospheric ozone transferred into the troposphere during the particular synoptic event.
    publisherAmerican Meteorological Society
    titleSimulation of Extratropical Synoptic-Scale Stratosphere–Troposphere Exchange Using a Coupled Chemistry GCM: Sensitivity to Horizontal Resolution
    typeJournal Paper
    journal volume57
    journal issue17
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2000)057<2824:SOESSS>2.0.CO;2
    journal fristpage2824
    journal lastpage2838
    treeJournal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 017
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian