Aerosols
; Atmospheric aerosols
; Image reconstruction
; Optical properties
; Pollution
; Radiometers
; Spectrometers
; AERONET
; Aerosol optical depths
; China
; MODIS
; Spatio-temporal comparison
; Validation
; Air pollution
; accuracy assessment
; AERONET
; aerosol property
; atmospheric pollution
; comparative study
; diurnal variation
; ground-based measurement
; model validation
; MODIS
; optical depth
; seasonal variation
; spatial distribution
; spatiotemporal analysis
; aerosol optical depth
; air pollution
; air pollution indicator
; air quality
; Article
; China
; circadian rhythm
; climate change
; comparative study
; controlled study
; evaluation study
; optical depth
; priority journal
; seasonal variation
; spatiotemporal analysis
; spring
; summer
; China
Scopus学科分类:
Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
The recently released Moderate Resolution Imaging Spectrometer (MODIS) Collection 6 introduced a fine scale aerosol optical depth (AOD) distribution, the 3�km product, which is expected to perform well in analyzing aerosols and identifying local air pollution, especially in the severely polluted atmosphere of China. However, few detailed evaluations of regional variations have been conducted. In this paper, we evaluate MODIS 3�km and 10�km AOD products for China against ground-based measurements and compare their performance with respect to spatial and temporal variations. The ground validations indicate that the two products are generally correlated well to ground-based observations. Spatially, the 3�km product slightly outperform the 10�km product in well-developed areas of southern China. Temporally, both products perform worse during spring and summer. Atmospheric clouds and underlying surface are two key factors that influence the accuracy and number of retrievals for both products. The comparison analysis reveals the newly introduced AOD product clearly shows good relationships with the coarse resolution retrievals in spatial and temporal variation but significant differences regarding details. The 3�km AOD product provides better aerosol gradients, more retrievals in bare areas of western China and some spikes of diurnal variation in cloudy days. Seasonal comparisons show the 3�km AOD product is higher than the 10�km product in all seasons, especially during spring and summer. Although the 3�km product for China generally performs slightly worse than the 10�km product, the added information of the MODIS 3�km AOD product shows potential for studying local aerosol characterization, and may facilitate studies of air pollution. � 2017 Elsevier Ltd
Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong; Big Data Decision Analytics (BDDA) Research Centre, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China; Shenzhen Research Institute, The Chinese University of Hong Kong, Nanshan District, Shenzhen, China
Recommended Citation:
He Q,, Zhang M,, Huang B,et al. MODIS 3�km and 10�km aerosol optical depth for China: Evaluation and comparison[J]. Atmospheric Environment,2017-01-01,153