污染大气边界层的长波冷却率模式

LONGWAVE COOLING RATE MODEL FOR POLLUTED ATMOSPHERIC BOUNDARY LAYER

中文关键词:  大气气溶胶  水汽连续吸收  长波冷却率

英文关键词:Atmospheric aerosol  Water vapor continuum absorption  Long wave cooling rate

中文摘要:

      考虑大气气溶胶在长波窗区的散射和吸收作用以及水汽的连续吸收作用,建立了一个适用于污染大气边界层的长波冷却率模式。计算结果表明:当单位面积气柱中气溶胶含量为785.9mg/m²时,气溶胶的作用可使到达地面的长波向下辐射增大39W/m².在大气窗区,大气气溶胶和水汽的连续吸收对长波冷却率的影响是同等重要的。在水汽含量和气溶胶浓度较大的大气边界层内,水汽连续吸收的冷却率最大时可达1.3K/d,气溶胶的冷却率最大时可达到1.66K/d,二者对长波冷却率的贡献均不容忽视。

英文摘要:

      Taking account of the scattering and absorption of atmospheric aerosoland water vapor continuum,along wave cooling rate model for polluted atmospheric boundary layer was established in this paper.The calculated results show that the aerosol with a content of 785.9mg/m² leads to an increase of 39W/min the surface dow nward infrared radiative flux.The effects of the atmospheric aerosol and continuum absorption on long-wave cooling can be of equal importance.When the water contents and aerosol concentration are high in the at mospheric boundary layer,the maximum cooling rate due to water vapour continuum and aerosol can amountto 1.3K/d and 1.66K/d,respectively, and the contributions of aeroso land continuum absorption to longwave cooling rate can not be ignored.