Neural Network AEROsol Retrieval for Geostationary Satellite (NNAeroG):
Algorithm Framework Development
Abstract
Geostationary satellites observe the earth surface and atmosphere with a
short repeat time which can thus provide aerosol parameters with high
temporal resolution. Due to the limited information content in satellite
data, and the coupling between the signals received from the surface and
the atmosphere, the accurate retrieval of multiple aerosol parameters
over land is difficult. Here we propose a Neural Network AEROsol
retrieval framework for Geostationary satellite (NNAeroG) which can
potentially be applied to different instruments to retrieve various
aerosol parameters. NNAeroG was applied for aerosol retrieval using data
from the Advanced Himawari Imager on Himawari-8 and the results were
evaluated versus independent ground-based sun photometer reference data.
The retrieved Aerosol Optical Depth, Ångström Exponent and Fine Mode
Fraction are significantly better than the official JAXA aerosol
products. The use of thermal infrared bands is meaningful for aerosol
retrieval.