中国东部地区夏季对流层大气辐射加热的研究

A Study on Atmospheric Radiation Heating over East China in Summer Troposphere Using TOVS Data

应用TOVS资料及MORTRAN3模式,研究中国东部夏季对流层的太阳短波辐射和红外辐射对大气的加热状况。考虑不同纬度,不同大气状况下12个站点43个样本的太阳加热率和红外冷却率情况,分析发现:在夏季的对流层,太阳加热率随着距地面的高度增加而减小,它的大小及变化率与纬度、天顶角及当时大气的状况有关,同时,太阳加热率也存在日变化。红外冷却率在对流层中、高层有极小值,它的大小及变化率与当时的大气状况及纬度有关。将本文的结果与前人的结论及实况相比较,发现本文较为真实地反映了中国东部地区夏季对流层的辐射加热情况,利用卫星资料计算的结果基本可信。

The solar and infrared radiation over east China in summer troposphere were calculated using the MODTRAN3 model and the satellite TOVS data.Solar heating rate and infrared cooling rate were calculated and analyzed from the 43 samples at 12 stations at different latitudes on sunshine day.It is found from the analyses that in summer troposphere,the solar heating rate decreases with height,and its magnitude and change rate are correlated with latitude,zenith angle and atmospheric state.And meanwhile,the solar heating rate also varies diurnally.The infrared cooling rate reaches the minimum value in middle and upper troposphere,and its magnitude and change rate are correlated with latitude and atmospheric state.Results of this paper were compared with precious conclusions and reality,and it is found that the results realistically reflect the radiation heating state of the summer troposphere over east China,and therefore are reliable.