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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >IMPACT OF AEROSOLS AND CLOUDS ON THE TROPOSPHERE AND STRATOSPHERE RADIATION FIELD WITH APPLICATION TO TWILIGHT PHOTOCHEMISTRY AT 20 KM
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IMPACT OF AEROSOLS AND CLOUDS ON THE TROPOSPHERE AND STRATOSPHERE RADIATION FIELD WITH APPLICATION TO TWILIGHT PHOTOCHEMISTRY AT 20 KM

机译：气溶胶和云团对对流层和平流层辐射场的影响及其在20 km暮光化学中的应用

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A series of coordinated investigations of polar stratospheric chemistry, radiation, and dynamics has resolved and generated many questions regarding ozone depletion in the Earth's atmosphere. Photodissociation plays a key role, and the radiation field models utilized have often been singled out as possible sources of uncertainty. Mean intensities (source functions) are compared for three independent models: discrete-ordinate, integral equation, and Monte Carlo simulation. It was found that the results differ by <10% for clear, cloudy, and aerosol conditions over an altitude range of 0-50 km, wavelength interval of 175-800 nm and a wide range of solar zenith angles, It is shown that in the presence of Pinatubolike aerosol concentrations, twilight photodissociation rates within an aerosol layer centered at 20 km can be reduced by more than an order of magnitude, whereas for solar zenith angles <60 degrees, photodissociation rate changes are a few percent or less. Assessment of the effects of the aerosols on twilight stratospheric chemistry within the aerosol layer shows that radiation field perturbations on the homogeneous photochemistry are small and that heterogeneous processes are the major source of the altered photochemistry. [References: 27]
机译：关于平流层极地化学，辐射和动力学的一系列协调研究已经解决，并产生了许多有关地球大气中臭氧消耗的问题。光离解起着关键作用，所使用的辐射场模型经常被选为不确定性的可能来源。比较了三个独立模型的平均强度（源函数）：离散坐标，积分方程和蒙特卡洛模拟。结果发现，在0-50 km的海拔范围，175-800 nm的波长间隔以及较宽的太阳天顶角范围内，晴，多云和气溶胶条件下的结果相差<10％。如果存在Pinatubolike气溶胶浓度，以20 km为中心的气溶胶层内的暮光解离速率可以降低一个数量级以上，而对于太阳天顶角<60度，光解离速率的变化会降低几个百分点或更少。评估气溶胶对气溶胶层内黄昏平流层化学的影响表明，对均匀光化学的辐射场扰动很小，并且异质过程是改变光化学的主要来源。 [参考：27]

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