Photodissociation in the atmosphere: 1. Actinic flux and the effects of ground reflections and clouds
Photodissociation in the atmosphere: 1. Actinic flux and the effects of ground reflections and clouds
复制标题
DOI：
10.1029/jd092id08p09740
复制
发表时间：
1987-08
影响因子：
--
通讯作者：
S. Madronich
中科院分区：
文献类型：
--
作者：
S. Madronich
必须将光化通量与其他辐射量（如辐照度）区分开来。这一区别表明：(1)最近的大气化学文献中有一部分包含了不正确计算的光解速率；(2)云内，特别是云滴内的光解速率系数经常超过晴空值，这与目前云化学模型的使用情况相反。这两个发现都可以追溯到太阳光束散射和扩散成几乎各向同性光时，在光化通量（而不是辐照度）中产生的~ 2 cos θ因子。
The actinic flux must be distinguished from other radiometric quantities such as the irradiance. This distinction shows that (1) a fraction of the recent atmospheric chemistry literature contains improperly calculated rates of photodissociation, and (2) photodissociation rate coefficients inside clouds, and particularly inside cloud droplets, can frequently exceed the clear-sky values, in contrast to current usage in cloud chemistry models. Both of these findings are traceable to the ∼2 cos θ factor incurred in the actinic flux (but not in the irradiance) when the solar beam is scattered and diffused into nearly isotropic light.