多云天气异戊二烯排放通量的计算

根据2002和2003年夏季内蒙古草原的实测资料,发现多云天气下,云通过可见光辐射对异戊二烯排放带来明显影响.研究和提高云量较大条件下异戊二烯排放通量计算的准确性是非常必要和重要的,它将有助于全面了解和准确估算不同天气、所有时段异戊二烯的排放通量.研究表明,对于云量≥6的时段,可以将经验公式中的大气质量(m)取为1,并使用原计算系数来计算异戊二烯的排放通量,其计算值与观测值相对偏差的平均值可降为72%,该方法可以明显降低多云天气下排放通量计算值的不确定性. 

The Calculation of Isoprene Emission Flux under Cloudy Sky Conditions

It is found that isoprene emission was obviously influenced by clouds through solar radiation,based on the observational data in the Inner Mongolia grassland during the summer seasons of 2002 and 2003.It is important and essential to study and improve the accuracy of calculating isoprene emission flux under the condition of larger cloudiness,which will help us to understand and accurately estimate the isoprene emission flux at different period of time under different sky conditions.The results showed that under the conditions of cloudiness ≥6,when all the coefficients keep the same as before and let the atmospheric mass is equal to 1 in the empirical algorithm,the average of relative bias between calculated and observed isoprene emission fluxes was reduced to 72%.The uncertainties of estimated emission flux of isoprene were reduced evidently by this method for cloudy sky conditions