Global integrated modeling framework of riverine dissolved inorganic nitrogen with seasonal variation

• Huang Yizhou

  Department of Multidisciplinary Science, Graduate School of Arts and Sciences, The University of Tokyo, Japan Institute of Industrial Science, The University of Tokyo, Japan

• Tokuda Daisuke

  Institute of Industrial Science, The University of Tokyo, Japan

• Zhou Xudong

  Institute of Industrial Science, The University of Tokyo, Japan

• Oki Taikan

  Department of Civil Engineering, Graduate School of Engineering, The University of Tokyo, Japan Rector’s Office, United Nations University, Japan

抄録

Understanding patterns and seasonal variations of excessive nutrients in surface water from anthropogenic activities is important for pollution control. In this study, we developed an integrated biogeochemical modeling framework for nitrogen exchanges among the atmosphere, terrestrial, and aquatic ecosystems. A land surface model, a terrestrial nitrogen cycle model, and a riverine hydrodynamics model incorporated with a river temperature model were consolidated and driven by multiple nitrogen sources related to anthropogenic activities. We estimated the global nitrogen loading and transporting in global rivers, with consideration of seasonal variations, and the validation demonstrates the reliability of the proposed model. The total dissolved inorganic nitrogen (DIN) flow rate is accumulated following rivers and it has high total DIN loads even in regions with low population density but large basin area, such as those at high latitudes. This study successfully improves estimation of nitrogen loading on global scale with consideration of seasonal variation. Our results show consistent trends with the observed data of DIN concentrations in global rivers, where all above variables are greatly affected by seasonal variations. The results also reflect the monthly-variant nitrogen inputs help produce closer DIN concentration estimates to observations, which will possibly stress the need for further study on seasonal variability of anthropogenic emissions.

収録刊行物

• Hydrological Research Letters

  Hydrological Research Letters 15 (3), 50-57, 2021

  水文・水資源学会／日本地下水学会／日本水文科学会／陸水物理研究会

キーワード

• Earth and Planetary Sciences (miscellaneous)
• Water Science and Technology

詳細情報

• CRID: 1390570176044340864
• NII論文ID: 130008065248
• DOI: 10.3178/hrl.15.50
• ISSN: 18823416
• Web Site: https://www.jstage.jst.go.jp/article/hrl/15/3/15_50/_pdf
• 本文言語コード: en
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