Eddy Flux Measurements, Ridge Station, Imnavait Creek, Alaska - 2015

In contribution to the Arctic Observing Network, the researchers have established two observatories of landscape-level carbon, water and energy balances at Imnavait Creek, Alaska and at Pleistocene Park near Cherskii, Russia. These will form part of a network of observatories with Abisko (Sweden), Zackenburg (Greenland) and a location in the Canadian High Arctic which will provide further data points as part of the International Polar Year. This particular part of the project focuses on simultaneous measurements of carbon, water and energy fluxes of the terrestrial landscape at hourly, daily, seasonal and multi-year time scales. These are the major regulatory drivers of the Arctic climate system and form key linkages and feedbacks between the land surface, the atmosphere and the oceans. We will provide a comprehensive description of the state of the regional Arctic system with respect to these variables, its overall regulation and controlling features and its interaction with the global system. In support of these objectives, a 3m eddy covariance station was established on a low ridge adjacent to Imnavait Creek, Alaska. This station has been continuously monitoring carbon dioxide, water vapor, energy fluxes and various micrometeorological variables.

为支撑北极观测网络（Arctic Observing Network）建设，研究人员分别在阿拉斯加州的伊姆纳威特溪（Imnavait Creek）与俄罗斯切尔斯基附近的更新世公园（Pleistocene Park）搭建了两处景观尺度的碳、水与能量平衡观测站。这些观测站将与瑞典阿比斯库（Abisko）、格陵兰的扎肯博格（Zackenburg）以及加拿大高北极地区的一处观测站点共同组成观测网络，作为国际极地年（International Polar Year）计划的一部分，该网络将提供更多观测数据点。本项目的这一分支聚焦于在小时、日、季节及多年时间尺度上，同步测量陆地景观的碳、水与能量通量。上述通量是北极气候系统的核心调控驱动因子，构成了陆面、大气与海洋之间的关键联系与反馈机制。我们将针对上述变量，全面阐述北极区域系统的现状、整体调控与控制特征，以及其与全球系统的相互作用。为支撑上述研究目标，科研团队在阿拉斯加州伊姆纳威特溪附近的低矮山脊上搭建了一座3米高的涡度协方差（eddy covariance）观测站。该站点已持续监测二氧化碳、水汽、能量通量及各类微气象变量。