Collaborative Research: A Measurement Program in Siberia to Assess Disturbance-Driven Changes in Arctic Carbon Fluxes (RAISE)

该项目包括在西伯利亚切尔斯基附近进行实地测量计划，以量化干扰对大气二氧化碳季节性循环的影响，以及森林和灌木苔原地区向北冰洋排放碳和氮的影响。该地区的沿海平原苔原在更新世期间在沉积物中积累了大量的碳，这些碳在全新世期间通过先前冻结的土壤的融化慢慢释放到大气和海洋中。植被的扰动，特别是森林火灾，通过更直接地暴露于侵蚀，使土壤加速碳流失。这项研究将比较未受干扰的地区和最近受到干扰的地区，并确定温度和水文变化对碳通量的影响。研究结果将用于模型中，以检验未来可能的扰动效应，特别是那些可能因气候变暖而加速的扰动效应。

This project involves conducting a field measurements program near Cherski, Siberia to quantify the impacts of disturbance on the seasonal cycle of atmospheric carbon dioxide and the discharge of carbon and nitrogen into the Arctic Ocean in forest and shrubby tundra regions. Coastal plain tundra in the region has accumulated large stores of carbon in sediments during the Pleistocene that has been slowly released to the atmosphere and ocean through melting of previously frozen soils during the Holocene. Disturbance, particularly forest fires, of the vegetation exposes the soils to accelerated carbon loss through more direct exposure to erosion. The study will compare an undisturbed region to recently disturbed areas and determine the effects of changes in temperature and hydrology on the rate of carbon flux. The results will be utilized in models to examine possible future disturbance effects, particularly those that could be accelerated by warmer climate conditions.