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. Since the industrial revolution, human activities have dramatically changedthe nitrogen (N) cycle in natural systems. Anthropogenic emissions ofreactive nitrogen ( Nr ) can return to the earth's surface through atmospheric Nr deposition. Increased Nr deposition may improveecosystem productivity. However, excessive Nr deposition can cause aseries of negative effects on ecosystem health, biodiversity, soil, andwater. Thus, accurate estimations of Nr deposition are necessary forevaluating its environmental impacts. The United States, Canada and Europehave successively launched a number of satellites with sensors that allowretrieval of atmospheric NO2 and NH3 column density and therefore estimation of surface Nr concentration and deposition at anunprecedented spatiotemporal scale. Atmosphere NH3 column can beretrieved from atmospheric infra-red emission, while atmospheric NO2 column can be retrieved from reflected solar radiation. In recent years,scientists attempted to estimate surface Nr concentration anddeposition using satellite retrieval of atmospheric NO2 and NH3 columns. In this study, we give a thorough review of recent advances of estimating surface Nr concentration and deposition using the satelliteretrievals of NO2 and NH3 , present a framework of using satellitedata to estimate surface Nr concentration and deposition based onrecent works, and summarize the existing challenges for estimating surface Nr concentration and deposition using the satellite-based methods. Webelieve that exploiting satellite data to estimate Nr deposition has abroad and promising prospect.

Reviewing global estimates of surface reactive nitrogen concentration and deposition using satellite retrievals