Air-surface exchange of reactive nitrogen
Reactive nitrogen (Nr) is all form of nitrogen compound with high reactivity except N2. Nr not only cause air pollution, but also transport in the atmosphere while changing their forms, and eventually deposit on the surface. Excess deposition of Nr can cause acidification, eutrophication, and biodiversity loss. There are still many unexplained processes in the dry deposition of these Nr, which leads to the uncertainty in the estimation and evaluation of dry deposition.
To better understand the mechanism of the air−surface exchange of Nr and contribute to the more accurate assessment of the impact of Nr deposition on ecosystems in the East Asian region, I conducted observations mainly focusing on NH4NO3, NH3, and HNO3 in forest and agricultural field in Japan. I developed various observation and model studies particularly focusing on the following two goals;
* Understand the mechanism of the dry deposition of NH4NO3 (nitrate), NH3 and HNO3 associated with the interactions.
* Investigate the NH3 bi-directional exchange and verify the applicability of the bi-directional exchange model based on field measurements in Japan with the aim of expanding to East Asia.