NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness over Global Oceans, Version 2.0. CLIMATE APPLICATIONS: Aerosol climate forcing, climate model evaluation, long-term trend of air quality, etc.. OFFICIAL CITATION: Xuepeng Zhao, Pui Chan, and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of AVHRR Daily and Monthly Aerosol Optical Thickness over Global Oceans, Version 2.0. NOAA National Centers for Environmental Information. doi:10.7289/V5SB43PD