CAREER: Measurement and Modeling of Land-Atmosphere Isotopic Carbon Dioxide (CO2) Exchange in the Upper Midwest, United States

职业：美国中西部北部陆地-大气同位素二氧化碳 (CO2) 交换的测量和建模

• 批准号: 0546476
• 负责人: Timothy Griffis
• 金额: $ 60.09万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0546476&HistoricalAwards=false
• 关键词: CAREER; Measurement; Modeling; Land; Atmosphere

The goal of this project is an improved understanding of the biophysical processes and discrimination mechanisms controlling the exchange of carbon dioxide (both 13C and 12C CO2) between the land and atmosphere at the ecosystem, landscape, and regional scales. It will focus on improved methods for measuring and modeling concentrations of trace species and fluxes in and out of the atmosphere. The approach utilizes fast tunable diode laser (TDL) measurement of isotopomer mixing ratios in combination with the eddy covariance approach for isotopic flux measurements in a heterogeneous landscape from a tall tower. The objectives are to: 1) Develop and improve micrometeorological and boundary layer methods for measuring isotopic carbon dioxide (CO2) fluxes; 2) Quantify isotopic fluxes and biophysical parameters to help understand 13CO2 discrimination mechanisms; 3) Determine the extent, rate of change, and controls on isotopic disequilibrium within a heterogeneous region in the upper Midwest, United States; and 4) Combine measurements and models to constrain key discrimination parameters at the ecosystem, landscape, and regional scales.Undergraduate training activities will be provided in micrometeorological theory and techniques, stable isotope theory and techniques, data acquisition methods, and modeling. An intermediate undergraduate course on Land-Atmosphere Interactions will be developed and will include an intensive 2-week field component. Broader impacts also include the development of techniques for studying the impact of climate variation and land management on atmospheric CO2, assessment of the carbon sink/source potential of regions dominated by land use change, and outreach efforts including collaboration with Minnesota Public Radio.

该项目的目标是更好地了解生物物理过程和识别机制，控制土地和大气之间的二氧化碳（13 C和12 C CO2）在生态系统，景观和区域尺度上的交换。 它将侧重于改进测量和模拟大气层内外痕量物种浓度和通量的方法。 该方法利用快速可调谐二极管激光器（TDL）的同位素混合比的测量相结合的涡度协方差方法的同位素通量测量在一个异质景观从一个高塔。 其目标是：1）发展和改进测量同位素二氧化碳（CO2）通量的微气象和边界层方法; 2）量化同位素通量和生物物理参数以帮助理解13 CO2辨别机制; 3）确定在美国上中西部异质区域内同位素不平衡的程度、变化率和控制;（4）结合联合收割机测量和模型，以约束生态系统、景观和区域尺度上的关键判别参数。本科生培训活动将提供微气象理论和技术、稳定同位素理论和技术、数据采集方法和建模。 将开发一门关于陆地-大气相互作用的中级本科课程，其中包括为期两周的强化实地部分。 更广泛的影响还包括开发研究气候变化和土地管理对大气CO2影响的技术，评估以土地使用变化为主的地区的碳汇/源潜力，以及与明尼苏达州公共广播电台合作等外联工作。