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Volume 14 Issue 4

Oct.  1997

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 1997 >  14(4): 535-540

The Effect of Mesoscale Flows on Regional Atmospheric Transport in a Complex Terrain

  • 1.

    Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029


doi: 10.1007/s00376-997-0071-4

  • Model results simulated over a complex terrain under a synoptically calm condition, using a three-dimensional (3-D) regional-scale meteorological acid deposition model (RMADM), show that thermally induced mesoscale cir-culations (MCs): sea-and land-breeze circulations and up- and down-slope flow circulations play a fundamental role in determining how the pollutants being dispersed. Analysis showed that under synoptically calm condition, the role played by the MC would dilute the smoke released during the early stage of the emission, the accumulation, however, would become important if the synoptically calm condition lasts long. Since the structure and intensity of the MCs depend on geography and topographical allocation, land surface coverage, incoming solar radiation intensity and so on, it makes the estimates of source-reception relationship and long-range atmospheric dispersion more diffi-culty. It concluded that it is impossible for a pollution model to correctly simulate smokes transport using only the synoptic station data, since the mesoscale information can not be resolved from these datasets.
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    • Manuscript History

    Manuscript received: 10 October 1997
    Manuscript revised: 10 October 1997
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    The Effect of Mesoscale Flows on Regional Atmospheric Transport in a Complex Terrain

    • 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
    • Manuscript received: 1997-10-10
    • Manuscript revised: 1997-10-10

    Abstract: Model results simulated over a complex terrain under a synoptically calm condition, using a three-dimensional (3-D) regional-scale meteorological acid deposition model (RMADM), show that thermally induced mesoscale cir-culations (MCs): sea-and land-breeze circulations and up- and down-slope flow circulations play a fundamental role in determining how the pollutants being dispersed. Analysis showed that under synoptically calm condition, the role played by the MC would dilute the smoke released during the early stage of the emission, the accumulation, however, would become important if the synoptically calm condition lasts long. Since the structure and intensity of the MCs depend on geography and topographical allocation, land surface coverage, incoming solar radiation intensity and so on, it makes the estimates of source-reception relationship and long-range atmospheric dispersion more diffi-culty. It concluded that it is impossible for a pollution model to correctly simulate smokes transport using only the synoptic station data, since the mesoscale information can not be resolved from these datasets.

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