SGER: Modeling River Nitrogen Export to Coastal Zones in the Community Climate System Model (CCSM)

SGER：在社区气候系统模型 (CCSM) 中对河流氮输出到沿海地区进行建模

• 批准号: 0431644
• 负责人: Cynthia Nevison
• 金额: $ 2.5万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2004-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0431644&HistoricalAwards=false
• 关键词: SGER; Modeling; River; Nitrogen; Export

Increased nitrogen (N) delivery to coastal areas is one of the major consequences of human perturbation to the nitrogen cycle, and has important impacts on coastal productivity and trace gas emissions. Motivated by this observation, this research is a first effort to model river nutrient transport in the Community Climate System Model (CCSM). Leached N fluxes from the DAYCENT model, which serves as the basis for the soil agricultural biogeochemistry model that eventually will be developed within the CCSM Land Model (CLM), will be coupled to the CLM River Transport Model (RTM). (DAYCENT is the daily time step version of the Century Model, a soil organic matter model that simulates daily trace gas fluxes and soil water dynamics). Modeled river N fluxes will be compared to observational databases and to simple empirical estimates of N export derived from statistical correlations. Modeled N export fluxes to coastal areas will be used to evaluate coastal N budgets, through comparison to modeled and measured atmospheric N inputs and to estimated natural coastal nitrification rates. The broader impacts of the proposed study include the development of a framework for the simulation of river solute transport in the CCSM, which will contribute to the more complete representation of the global N cycle in the CCSM and will provide important boundary conditions for the coupling of the CLM with regional coastal models.

向沿海地区输送的氮 (N) 增加是人类扰动氮循环的主要后果之一，并对沿海生产力和微量气体排放产生重要影响。 受这一观察的推动，这项研究是社区气候系统模型（CCSM）中河流养分输送模型的首次尝试。 DAYCENT 模型中的淋滤氮通量是土壤农业生物地球化学模型的基础，最终将在 CCSM 土地模型 (CLM) 内开发，并将与 CLM 河流输送模型 (RTM) 耦合。 （DAYCENT 是世纪模型的每日时间步长版本，是模拟每日微量气体通量和土壤水动态的土壤有机质模型）。 模拟的河流氮通量将与观测数据库以及根据统计相关性得出的氮输出的简单经验估计进行比较。 通过与模拟和测量的大气氮输入以及估计的自然沿海硝化率进行比较，模拟向沿海地区的氮输出通量将用于评估沿海氮预算。 拟议研究的更广泛影响包括开发一个用于模拟 CCSM 中河流溶质迁移的框架，这将有助于更完整地表示 CCSM 中的全球氮循环，并将为耦合具有区域沿海模型的 CLM。