Long Term Patterns of and Controls on Inter- and Intra-annual Variability in CO2 Flux in the Alaskan Arctic

该项目将研究气候变暖对阿拉斯加西部北坡冻土带每年二氧化碳储存和/或释放的潜在影响。这些测量将由位于阿拉斯加巴罗、阿特卡苏克和伊沃图克的涡流通量塔进行，并将结果与MODIS卫星仪器的遥感数据进行比较。本研究是对阿拉斯加北坡陆地对气候变化响应的长期研究的延续和扩展。这一阶段的研究将在季节、年和年代际尺度上考察二氧化碳通量对北极涛动振荡的响应变化。随着对该地区气候变化的了解越来越多，该地区的结果将用于生态系统的计算机模拟，以便为研究建立预测能力。净生态系统碳通量的时间变化对生态系统和土壤湿度的驯化将在不同的时间尺度上确定。在气候变暖似乎正在影响陆地环境的时候，这项研究对于了解冻土带生态系统二氧化碳通量的区域和年度模式，特别是变异性非常重要。

This project will examine the potential effect of climate warming on the annual storage and/or release of carbon dioxide from tundra on the western Alaska North Slope. The measurements will be made with eddy flux towers in Barrow, Atqasuk, and Ivotuk Alaska and the results compared to remote sensing data from the MODIS satellite instruments. This study represents a continuation and expansion of a long-term examination of terrestrial responses to climate change on the Alaska North Slope. This phase of the study will examine variations of carbon dioxide flux in response to oscillations of the Arctic Oscillation on seasonal, annual, and decadal time scales. The regional results will be used in computer simulations of the ecosystem in order to build a predictive capacity to the research as more is known about climate change in the region. The acclimation of the ecosystem and soil moisture from temporal changes in net ecosystem carbon flux will be determined over varying time-scales. The study is important to understanding regional and annual patterns, particularly the variability, of carbon dioxide flux from tundra ecosystems at a time when climate warming appears to be affecting the terrestrial environment.