Abstract
We developed a method reasonably estimating nitrogen dry deposition (HNO3, NH3, and particulate NO3− and p-NH4+), for assessing nitrogen load on forests in East Asia, in cooperation with the Acid Deposition Monitoring Network in East Asia (EANET). Although hourly meteorological data for the dry deposition velocity calculation is commonly requested, only monthly meteorological data has been released in virtually EANET sites. As a result, we developed the method calculating the deposition velocities based on publicly available monthly meteorological data. When considering monthly data, the calculation of the surface wetness period in a month, which has a large impact on the deposition velocities of nitrogen components, was especially considered. The developed method accurately recreated the calculated deposition velocities based on hourly meteorological data. A case study on calculating total (dry and wet) nitrogen deposition was carried out in 2019 at 22 sites in 7 countries in East Asia. The total nitrogen deposition amounts exceeded 10 kg N ha−1 year−1 in many sites in Japan and Southeast Asian sites. The risks of nitrogen load on the forest ecosystems were certainly high in mid-latitude and southeast areas in East Asia.
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Data Availability
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We gratefully acknowledge all the people involved in the monitoring activities at the EANET sites used in this study. We would like to thank Ms. Sakurako Yamaga and Mr. Kosuke Onji (Tokyo University of Agriculture and Technology) for their support of the data analysis.
Funding
This work was supported by the Steel Foundation for Environmental Protection Technology (38th and 39th grants).
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Satomi Ban: formal analysis, investigation, writing – original draft: Kazuhide Matsuda: conceptualization, methodology, writing- reviewing and editing, supervision: Tsuyoshi Ohizumi: investigation, resources, writing – review and editing.
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Ban, S., Matsuda, K. & Ohizumi, T. A Method Estimating Dry Deposition for Assessment of Nitrogen Load on Forests in East Asia. Water Air Soil Pollut 233, 417 (2022). https://doi.org/10.1007/s11270-022-05874-5
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DOI: https://doi.org/10.1007/s11270-022-05874-5