Hydrogeologic Drivers for the Carbon Dynamics in Large Peatlands

摘要提案#:DEB-9615429研究者(S): GLASER等。标题：大型泥炭地碳动态的水文驱动因素北美的大型泥炭盆地在全球碳循环中是一个重要的水库，也是温室气体的重要来源。作为研究的一部分，区域地下水模型的发展将为量化气候变化对这些泥炭地的水和碳通量的影响提供有力的方法，因为这些地下水模型可以通过实地观测、数字高程模型和遥感进行实际校准。这些模型将在明尼苏达州的阿加西冰川湖地区进行开发和测试。本研究的设计是跨学科的，结合了实地测量、建模和遥感，以确定1)地下水位的区域地形及其对短期和长期气候变化的响应；2)地下水位波动对流经这些生态系统的流动系统、溶质运输和碳通量的影响；3)泥炭火灾造成的碳损失的频率和幅度；4)水和碳平衡的区域估计。该设计包括调查该地区相对较高的泥炭积累率与相当干燥的区域气候中甲烷的高排放率之间的明显不一致。

ABSTRACT PROPOSAL # : DEB-9615429 INVESTIGATOR(S) : GLASER et al. INSTITUTION: UNIVERSITY OF MINNESOTA TITLE: Hydrologic Drivers for the Carbon Dynamics in Large Peatlands The large peat basins of North America represent an important reservoir in the global carbon cycle and a significant source for greenhouse gases. The development of regional groundwater models as part of this research should provide a powerful method to quantify the impact of climatic change on the water and carbon flux of these peatlands, because these groundwater models can be realistically calibrated by field observations, digital elevation models, and remote sensing. These models will be developed and tested in the Glacial Lake Agassiz region of Minnesota. The design of this research is interdisciplinary and combines field measurements, modeling, and remote sensing to determine 1) the regional topography of the water table and is response to short- and longer term climatic changes, 2) the effect of water table fluctuations on flow systems, solute transport, and carbon flux through these ecosystems, 3) the frequency and magnitude of carbon losses from peat fires, and 4) regional estimates for the water and carbon balance. The design includes investigation of the apparent inconsistency between the relatively high rates of peat accumulation in the region combined with high emission rates for methane in a fairly dry regional climate.