Biogeochemistry of the Amazon River: Mainstem-Flood Plain Linkages

全面了解控制 亚马逊河干流的地球化学需要 考虑一系列的尺度。 该项目涉及 主要是那些在快速到中等速度下运行的过程 动态控制的联系， 洪泛区 根据一系列研究巡航的研究， 团队将： 1)使用额定曲线法确定物质过程线， 主要采样站。 2)预测各个元素的通量。 3)计算水在漫滩上的停留时间， 由陆地卫星图像确定的洪水模式。 4)使用路由模型为两个- 三维水动力学模型 5)使用此模型驱动沉积物输运/交换模型， 用现场数据进行校准，现场数据经过验证 在陆地卫星MSS图像上可以看到浑浊的图案。 6)用一系列有机质同位素示踪剂来鉴别 负责交换的人。 7)检查潜在的DOC吸附机制。 8)完善河流内呼吸速率估算。 9)通过以下方式确定哪类化合物可能是底物： 测量生物标志物的变化。 10)使用以下方法评估这些化合物的总体潜力： 流体动力学模型作为驱动器。 这个研究团队是一个优秀的团队， 富有成效的合作。 受赠机构的设施 巴西业务的住宿条件非常好 中心 与巴西科学合作伙伴的关系是长期的- 站得很好，很出色。

An overall understanding of the processes controlling the biogeochemistry of the Amazon River mainstem requires consideration of a series of scales. This project addresses primarily those processes operating at the fast- to intermediate dynamic control of the linkages between the mainstem and floodplain. Based on a series of research cruises the research team will: 1) Use a rating-curve approach to define material hydrographs at the primary sampling stations. 2) Predict fluxes for the respective elements. 3) Calculate the residence time of water on the floodplain, with inundation patterns determined by Landsat imagery. 4) Use the routing model to provide boundary conditions to a two- dimensional hydrodynamic model. 5) Use this model to drive a sediment transport/exchange model, calibrated with data from field sites validated with field data and with turbidity patterns visible on Landsat MSS images. 6) Use a series of isotope tracers of organic mater to identify sources responsible for exchange. 7) Examine potential DOC adsorption mechanisms. 8) Refine the within river respiration rate estimates. 9) Identify what class of compounds may be the substrates by measuring changes in biomarkers. 10) Evaluate the overall potential of these compounds using the hydrodynamic model as a driver. The research team is an excellent one with a long history of productive collaboration. Facilities at the grantee institution are excellent, and accommodations at the Brazilian operations center. Relations with Brazilian scientific partners are long- standing and excellent.