Collaborative Research: Using the ITEX-AON network to document and understand terrestrial ecosystem change in the Arctic

合作研究：利用 ITEX-AON 网络记录和了解北极陆地生态系统的变化

• 批准号: 1836861
• 负责人: Craig Tweedie
• 金额: $ 109.21万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1836861&HistoricalAwards=false
• 关键词: Collaborative; Research; Using; ITEX; AON

The overarching goal of the project is to understand tundra ecosystem change across landscape types and enable realistic forecasts of change across the Arctic. The power of the International Tundra Experiment (ITEX)- Arctic Observatory Network (AON) is founded on a capacity to synthesize and compare results across sites that use standardized sampling protocols. Specifically, this project will (1) maintain the data-streams at ITEX-AON sites in Alaska near Toolik Lake, Imnavait Creek, Utqiagvik (Barrow), and Atqasuk; (2) lead two new ITEX network syntheses focused on soil carbon and phenocam imagery; (3) increase scientific literacy; and, (4) expand citizen science opportunities across communities in northern Alaska. The project will sustain an array of large and publicly available data-streams documenting ecosystem change occurring across the Arctic and will team up with citizen scientists to expand the monitoring footprint of the network and the societal relevance of this work to communities across the North Slope of Alaska. The ITEX network was chartered in 1990 to document and understand the ecological impacts of a warming Arctic. The US-led ITEX projects expanded their monitoring efforts across a larger spatial area with the use of automated sampling to form an Arctic Observatory Network (AON) in 2009. The ITEX-AON currently includes traditional ITEX measurements (phenology, cover, carbon flux and nutrient cycling), as well as phenocams, automated mobile sensor platforms (MISP) and mid-scale aerial imagery of 1 km2 ARCSS (Arctic System Science) grids established in the 1990s. In this phase of the project, collection of core data sets will be sustained and new data sets will be added with the aim of identifying and understanding patterns of change and feedbacks. Specifically, ITEX-AON will expand its collection of vegetation functional traits to better understand ecosystem response and predict future change. ITEX-AON will also further expand automated measurements to link plot level change (sampled by hand or with hand-held equipment) with landscape level observations (sampled by phenocams or drones) and high resolution regional imagery (sampled by aircraft or satellite). The new phase of ITEX-AON will include two synthesis efforts: (1) an examination of soil carbon dynamics across the ITEX network, and (2) a multi-scale phenological analysis using phenocam and high resolution satellite imagery to determine fine-scale spatiotemporal patterns of seasonal greening trends across the Arctic. Mentoring of postdocs, and training of graduate and undergraduate students are some of the primary broader impacts of this project. The project will continue to provide a test bed for engineering and software development that will be shared freely among the ITEX network and broader science community and will expand outreach activities aimed at improving science literacy.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的首要目标是了解不同景观类型的冻土带生态系统变化，并能够对整个北极地区的变化进行现实的预测。国际冻原实验(ITEX)-北极观测网(AON)的力量建立在使用标准化采样协议的地点综合和比较结果的能力上。具体地说，该项目将(1)维持阿拉斯加靠近Toolik湖、ImNavait Creek、Utcheagvik(Barrow)和Atqasuk的ITEX-Aon站点的数据流；(2)领导两个新的ITEX网络综合，侧重于土壤碳和酚类摄像头图像；(3)提高科学素养；以及(4)扩大阿拉斯加北部社区的公民科学机会。该项目将维持一系列大型的公开可用的数据流，记录整个北极发生的生态系统变化，并将与公民科学家合作，扩大该网络的监测足迹，并将这项工作的社会相关性扩大到阿拉斯加北坡的社区。ITEX网络成立于1990年，目的是记录和了解北极变暖对生态的影响。2009年，由美国牵头的ITEX项目通过使用自动采样，将监测工作扩展到更大的空间区域，形成了北极观测网络(AON)。ITEX-AON目前包括传统的ITEX测量(物候、覆盖、碳通量和养分循环)，以及物候相机、自动移动传感器平台和1990年代建立的1平方公里ARCS(北极系统科学)网格的中等尺度航空图像。在该项目的这一阶段，将继续收集核心数据集，并将增加新的数据集，目的是查明和了解变化和反馈的模式。具体地说，ITEX-Aon将扩大其植被功能特征的收集，以更好地了解生态系统响应并预测未来变化。ITEX-Aon还将进一步扩大自动化测量，将地块水平变化(手工或手持设备采样)与地貌水平观测(通过风光相机或无人机采样)和高分辨率区域图像(由飞机或卫星采样)联系起来。新一阶段的ITEX-AON将包括两项综合工作：(1)研究整个ITEX网络的土壤碳动态；(2)利用物候相机和高分辨率卫星图像进行多尺度物候分析，以确定北极地区季节性绿化趋势的精细时空模式。对博士后的指导，以及对研究生和本科生的培训是这个项目的一些主要的更广泛的影响。该项目将继续为工程和软件开发提供一个试验台，将在ITEX网络和更广泛的科学界之间自由共享，并将扩大旨在提高科学素养的外联活动。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Leaf-level chlorophyll fluorescence and reflectance spectra of high latitude plants

高纬度植物叶级叶绿素荧光和反射光谱

• DOI: 10.1088/2515-7620/ac5365
• 发表时间: 2022
• 期刊: Environmental Research Communications
• 影响因子: 2.9
• 作者: Huemmrich, K Fred;Campbell, Petya;Vargas Z, Sergio A;Sackett, Sarah;Unger, Steven;May, Jeremy;Tweedie, Craig;Middleton, Elizabeth
• 通讯作者: Middleton, Elizabeth

Understanding spatial variability of methane fluxes in Arctic wetlands through footprint modelling

• DOI: 10.1088/1748-9326/ab4d32
• 发表时间: 2019-10
• 期刊: Environmental Research Letters
• 影响因子: 6.7
• 作者: K. Reuss-Schmidt;P. Levy;W. Oechel;C. Tweedie;C. Wilson;D. Zona

Range shifts in a foundation sedge potentially induce large Arctic ecosystem carbon losses and gains

• DOI: 10.1088/1748-9326/ac6005
• 发表时间: 2022-03
• 期刊: Environmental Research Letters
• 影响因子: 6.7
• 作者: S. Curasi;N. Fetcher;R. Hewitt;P. Lafleur;M. Loranty;M. Mack;J. May;I. Myers-Smith;S. Natali;S. Oberbauer;Thomas C. Parker;O. Sonnentag;Sergio A Vargas Zesati;S. Wullschleger;A. Rocha

Can Plot-Level Photographs Accurately Estimate Tundra Vegetation Cover in Northern Alaska?

• DOI: 10.3390/rs15081972
• 发表时间: 2023-04
• 期刊: Remote. Sens.
• 作者: Hana L. Sellers;S. V. Zesati;S. Elmendorf;Alexandra B. Locher;S. Oberbauer;C. Tweedie;C. Witharana;R. Hollister

Complexity revealed in the greening of the Arctic

• DOI: 10.1038/s41558-019-0688-1
• 发表时间: 2020-02-01
• 期刊: NATURE CLIMATE CHANGE
• 影响因子: 30.7
• 作者: Myers-Smith, Isla H.;Kerby, Jeffrey T.;Wipf, Sonja
• 通讯作者: Wipf, Sonja