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.

该项目的总体目标是了解跨景观类型的苔原生态系统的变化，并实现整个北极变化的现实预测。国际苔原实验（ITEX） - 北极天文台网络（AON）的力量是建立在合成和比较使用标准化采样协议的站点的能力的基础上的。具体而言，该项目将（1）在阿拉斯加的ITEX-AON站点保持数据流，附近的Toolik Lake，Imnavait Creek，Utqiagvik（Barrow）和Atqasuk； （2）领导着两个新的ITEX网络合成，重点是土壤碳和苯可汉图像； （3）提高科学素养； （4）扩大了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数据流，记录北极地区发生的生态系统变化，并将与公民科学家合作，以扩大网络的监测足迹以及这项工作的社会相关性与阿拉斯加北坡的社区。 ITEX网络于1990年被租用，以记录和了解变暖北极的生态影响。由美国领导的ITEX项目通过使用自动抽样来扩大他们的监控工作，并在2009年使用自动抽样形成北极天文台网络（AON）。当前ITEX-AON包括传统的ITEX测量值（候选，覆盖，涵盖，碳泄漏和养分循环），以及1个earomated Mobial Spector Spirate Aperaimement airape airapers平台（Mis 2），以及Mis的IDMAL MIS-SCERALE（MISSC）弧线（北极系统科学）网格于1990年代建立。在项目的这个阶段，将持续核心数据集的收集，并添加新的数据集，以识别和理解变化和反馈的模式。具体而言，ITEX-AON将扩大其植被功能性状的收集，以更好地了解生态系统的反应并预测未来的变化。 ITEX-AON还将进一步扩展自动测量值，以将图级别的变化（用手或手持设备采样）与景观水平观测值（由苯酚或无人机采样）和高分辨率区域图像（由飞机或卫星采样）。 ITEX-AON的新阶段将包括两项综合工作：（1）对ITEX网络上的土壤碳动态进行检查，以及（2）使用现场和高分辨率卫星图像进行多尺度的苯候分析，以确定整个Arctic季节性绿色趋势的精细规模时空时空模式。该项目的主要广泛影响是对博士后的指导以及研究生和本科生的培训。该项目将继续为工程和软件开发提供测试床，该床将在ITEX网络和更广泛的科学界之间自由共享，并将扩大旨在改善科学素养的外展活动。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来支持的。

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

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

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

NDVI Changes Show Warming Increases the Length of the Green Season at Tundra Communities in Northern Alaska: A Fine-Scale Analysis

• DOI: 10.3389/fpls.2020.01174
• 发表时间: 2020-07-31
• 期刊: FRONTIERS IN PLANT SCIENCE
• 影响因子: 5.6
• 作者: May, Jeremy L.;Hollister, Robert D.;Oberbauer, Steven F.
• 通讯作者: Oberbauer, Steven F.