Large Area Estimates of Carbon Fluxes in Arctic Landscapes

该项目是对北极系统科学(ARCS)陆地/大气/冰相互作用(LAII)研究的重大贡献。这项研究将使用小室、塔基涡旋相关技术和飞机涡旋相关技术，在三个空间尺度(地块、景观和中尺度)上确定二氧化碳和水、动量和能量通量。将分析和比较从每一种技术获得的信息，特别是在确定估计北极大空间尺度二氧化碳通量的最有效方法的情况下。遥感光谱指数、地理信息系统、过程模型和唯象模型将被用来开发一种在中尺度和全球尺度上有效估计生态系统二氧化碳通量的方法。将在1993-1996年期间对这些方法的适用性进行初步测试。这项研究将产生研究区域(阿拉斯加中东部北坡)目前的二氧化碳通量、地貌不同要素对二氧化碳通量的贡献、净生态系统二氧化碳通量对环境条件变化的敏感性、预测北极二氧化碳通量的模型和方法以及估计中尺度和全球尺度二氧化碳和其他痕量气体通量的有效技术。

This project is a significant contribution to the Arctic System Science (ARCSS) Land/Atmosphere/Ice Interactions (LAII) study. The research proposed will determine CO2 and water, momentum, and energy fluxes at three spatial scales (plot, landscape, and mesoscale) using chamber, tower-based eddy correlation techniques, and aircraft-based eddy correlation techniques. The information obtained from each of these techniques will be analyzed and compared, especially in light of defining the most efficient approaches for estimating large spatial scale CO2 flux in the arctic. Remotely sensed spectral indices, GIS, process model, and phenomenological models will be used to develop a methodology for efficiently estimating ecosystem CO2 flux over meso- and global scales. Initial testing of the applicability of these methods will be undertaken during the 1993-1996. The research will yield the current CO2 flux for the area studied (east central north slope of Alaska), the contribution to CO2 flux of various elements of the landscape, the sensitivity of net ecosystem CO2 flux to altered environmental conditions, models and methodology to predict CO2 flux in the Arctic and efficient techniques for estimating meso- and global scale CO2 and other trace gas fluxes.