权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Collaborative Research: Carbon, Water, and Energy Balance of the Arctic Landscape at Flagship Observatories in Alaska and Siberia

合作研究：阿拉斯加和西伯利亚旗舰天文台北极景观的碳、水和能量平衡

基本信息

批准号：
1503912
负责人：
Marion Bret-Harte
金额：
$ 23.02万
依托单位：
University of Alaska Fairbanks Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-03-15 至 2020-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1503912&HistoricalAwards=false
关键词：
Collaborative Research Carbon Water Energy

项目摘要

Arctic terrestrial ecosystems exchange greenhouse gases (carbon dioxide and methane), water vapor, and energy with the atmosphere. The balance between uptake and release of these quantities influences both the Arctic region and the global climate system. The terrestrial cycling of carbon, water, and energy are strongly linked, and therefore need to be studied at the same time and in the same place. This project continues long-term measurements of carbon, water, and energy balance in terrestrial and freshwater systems in the Alaskan Arctic, extending measurements that began in 2007. Carbon loss over the winter has recently increased dramatically at one of our study sites, as winter air and soil temperatures have warmed. This study will determine whether these losses continue and seek to understand the underlying causes. Broader impacts of this project include contributions to teaching and learning, including underrepresented groups, support of undergraduate summer research, participation in the Marine Biology Laboratory Logan Science Journalism program and the Arctic LTER Schoolyard program, and outreach to K-12 schools in Fairbanks, Alaska, and to Native Alaskan communities. This project will support career development of two female Principal Investigators at UAF.The proposed research will extend continuous measurements of carbon, water, and energy balance in three tundra ecosystems near Imnavait Creek, Alaska. Ecosystem/atmosphere flux measurements have been collected at these sites via eddy covariance since 2007. Long-term monitoring of hydrology and stream chemistry of Imnavait Creek and depth of thaw in its catchment area will be maintained. Additional measurements to help interpret these data will include water table depth, plant community composition, and vegetation greenness via reflectivity, which is related to leaf area and biomass. Long-term measurements of stream chemistry and discharge are also available at Imnavait, enabling a comprehensive assessment of carbon budgets. All data will be made publicly available and archived at the Arctic Long-Term Ecological Research (LTER) web site, the International Arctic Research Center Data Archive, and the Advanced Cooperative Arctic Data and Information Service (ACADIS).

北极陆地生态系统与大气交换温室气体（二氧化碳和甲烷）、水蒸气和能量。这些数量的吸收和释放之间的平衡影响北极地区和全球气候系统。碳、水和能量的陆地循环密切相关，因此需要在同一时间、同一地点进行研究。该项目继续对阿拉斯加北极地区陆地和淡水系统的碳、水和能量平衡进行长期测量，扩展了自 2007 年开始的测量。随着冬季空气和土壤温度变暖，我们的一个研究地点的冬季碳损失最近急剧增加。这项研究将确定这些损失是否继续存在，并寻求了解根本原因。该项目更广泛的影响包括对教学和学习的贡献，包括代表性不足的群体、支持本科生暑期研究、参与海洋生物学实验室洛根科学新闻计划和北极 LTER 校园计划，以及向阿拉斯加费尔班克斯的 K-12 学校和阿拉斯加原住民社区进行推广。该项目将支持 UAF 两名女性首席研究员的职业发展。拟议的研究将扩大对阿拉斯加伊姆纳瓦伊特溪附近三个苔原生态系统碳、水和能量平衡的连续测量。自 2007 年以来，一直通过涡流协方差在这些地点收集生态系统/大气通量测量值。将维持对 Imnavait Creek 的水文和河流化学及其集水区解冻深度的长期监测。帮助解释这些数据的其他测量将包括地下水位深度、植物群落组成以及通过反射率测得的植被绿度，这与叶面积和生物量有关。 Imnavait 还提供水流化学和排放的长期测量，从而能够对碳预算进行全面评估。所有数据将在北极长期生态研究（LTER）网站、国际北极研究中心数据档案馆和高级合作北极数据和信息服务（ACADIS）上公开并存档。