The present invention discloses a method for inverting the function relationship between the
aerosol extinction coefficient
moisture absorption increasing factor and the
relative humidity by adopting the PM2.5
mass concentration as the constraint condition. According to the method, the determined
aerosol extinction coefficient alpha dry at the
relative humidity of no more than 40% and the PM2.5
mass concentration CPM2.5 are substituted into the formula defined in the specification to calculate the proportional coefficient K, the
aerosol extinction coefficient alpha wet and the PM2.5
mass concentration CPM2.5 at the arbitrary
relative humidity are determined at the same position, the proportional coefficient K and the PM2.5 mass concentration CPM2.5 at the arbitrary relative
humidity are substituted into the formula alpha=K.CPM2.5 to calculate the dry
aerosol extinction coefficient alpha dry at the arbitrary relative
humidity, the determined alpha wet and the calculated alpha dry are substituted into the formula defined in the specification to calculate the
aerosol extinction coefficient moisture absorption increasing factor f, the calculation process of the f is repeatedly performed at least 5 times, and the two groups of the data such as the relative
humidity RH of
atmosphere determined at the same position and the calculated
aerosol extinction coefficient moisture absorption increasing factor f are subjected to fitting to obtain the function relationship. According to the present invention, with the method, the PM2.5 mass concentration in the height range of 0-30 km on the ground can be conveniently detected at any time in a low cost manner.