Impacts of TROPOMI-Derived NO Emissions on NO and O Simulations in the NCP during COVID-19.

NO and O simulations have great uncertainties during the COVID-19 epidemic, but their biases and spatial distributions can be improved with NO assimilations. This study adopted two top-down NO inversions and estimated their impacts on NO and O simulation for three periods: the normal operation period (P1), the epidemic lockdown period following the Spring Festival (P2), and back to work period (P3) in the North China Plain (NCP). Two TROPOspheric Monitoring Instrument (TROPOMI) NO retrievals came from the Royal Netherlands Meteorological Institute (KNMI) and the University of Science and Technology of China (USTC), respectively.

[Application of hyper-spectral remote sensing technology in environmental protection].

Hyper-spectral remote sensing (RS) technology has been widely used in environmental protection. The present work introduces its recent application in the RS monitoring of pollution gas, green-house gas, algal bloom, water quality of catch water environment, safety of drinking water sources, biodiversity, vegetation classification, soil pollution, and so on. Finally, issues such as scarce hyper-spectral satellites, the limits of data processing and information extract are related.