Abstract
Aerosol extinction coefficient profile (ECP) is important in radiative transfer modeling, however, knowledge of ECP in some area has not been clearly recognized. To get a full understanding of statistical characteristics of ECP in three Asian regions: the Mongolian Plateau, the North China Plain and the Yellow Sea, CALIPSO aerosol product in 2012 is processed by conventional statistical methods. Orbit averaged ECP turns out to be mainly exponential and Gaussian patterns. Curve fitting shows that the two ECP patterns account for more than 50 percent of all the samples, especially in the Yellow Sea where the frequency of occurrence even reaches over 80 percent. Parameters determining fitting curves are provided consequently. To be specific, Gaussian pattern is the main ECP distribution in the Mongolian Plateau and the Yellow Sea, and exponential pattern predominates in the North China Plain. Besides, aerosol scale height reaches its maximum in summer and in the Mongolian Plateau. Meanwhile, the uplifting and deposition of dust during transportation are potentially explanations to the occurrence of Gaussian ECP. The results have certain representativeness, and contribute to reducing uncertainties of aerosol model in relevant researches.
Highlights
Aerosol extinction coefficient profile (ECP) is one of the most uncertain factors in radiation transfer modeling
If the fitting rate of orbit averaged ECP to (1) or (2) is larger than 0.6, orbit averaged ECP is deemed as the pattern corresponding to the larger fitting rate
Curve fitting shows that the two ECP patterns account for more than 50 percent of all the ECP samples
Summary
Aerosol extinction coefficient profile (ECP) is one of the most uncertain factors in radiation transfer modeling. With the deployment of lidar in atmosphere detection, measurement of ECP becomes feasible, and achievements have been made in characterizing statistical characteristics of ECP in certain areas[1]. Existing researches are usually confined to depict ECP qualitatively[2~3]. Knowledge of ECP in certain areas remains scarce. They are regions where ground-based lidar station is sparse, relevant researches are rare.
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