Collaborative Research: Quantifying changes in the Arctic hydrological cycle at the landscape scale using advances in water vapor isotope (18O & D) techniques and aircraft

合作研究：利用水蒸气同位素（18O）的进步，在景观尺度上量化北极水文循环的变化

• 批准号: 1203472
• 负责人: Jeffrey Welker
• 金额: $ 20.28万
• 依托单位: University of Alaska Anchorage Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203472&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantifying; changes; Arctic

The hydrological cycle has a central role in Arctic climate change, and is coupled toalterations of terrestrial, aquatic and cryosphere processes, including shifts in biogeochemical cycles. Monitoring these changes is a central part of the NSF Arctic Observing Network (AON), a consortium of projects with site-specific responsibilities and measurement packages. The next frontier for AON is facilitation of approaches that better quantify landscape and regional ecohydrological process by employing new analytical technologies (laser spectroscopy based water isotope analyzers) and integration of platforms, such as aircraft and satellites. This transformation of AON will initiate studies that quantify and integrate the heterogeneous landscapes of the Arctic tundra, while developing parallel capabilities to the NEON (National Ecological Observatory Network) program, thereby extending the relevance of AON to the continental-scale. We propose an EAGER project that applies a novel interdisciplinary approach by combining isotope geochemistry with boundary layer processes and measurements to monitor and measure the ecohydrology of tundra ecosystems and landscapes. This is a high-risk approach because it is a novel use of this particular instrument and it will change how Arctic ecohydrology is monitored and assessed. EAGER is the correct venue for our project because this novel application of water isotope spectroscopy in an aircraft is ?high risk, high reward? research and represents a radically different approach from laboratory-based studies that are the status quo. The intellectual merit of this project will be accomplished by addressing these primary questions: a) What are the spatial and temporal patterns in water vapor isotopes during the growing and shoulder seasons across the tundra ecosystems in the Arctic Foothills and Foothill-Coastal Plain boundary in Northern Alaska? To a more limited extent, we also ask: b) What is the ET isotope signature associated with different ecosystem types and disturbances (fire and thermokarst) relative to background moisture? c) What is the strength of the ecosystem ET signal in the overlying atmosphere (above the ecosystem boundary height)? The first question focuses on flight measurements, the second on ecosystem tower easurements, and the third on integrating the two measurement scales. The broader impacts and outreach of our project will be accomplished by initially sharing our findings with the scientific community at the fall meeting of the American Geophysical Union and with students as part of our teaching and seminars at the University of Alaska Anchorage (UAA) and the University of Alaska Fairbanks (UAF). We will also collaborate with AON colleagues on data sharing and data posting after post-processing our flight data and information. Our primary aim with this AON EAGER is to take the transformation step in ourcapacity to quantify hydrological processes at the landscape and region scale by: a) collaborating with Picarro Inc. (http://www.picarro.com/) in modifying the L2120-i for aircraft and thus landscape scale purposes and b) conducting a series of field/aircraft campaigns on the North Slope of Alaska. Our program would transform the measuring and monitoring of the terrestrial hydrological cycle beyond the point-based measurements of the past and that are currently in place with AON support (ie. Oberbauer and Welker at Toolik, Bret-Hart and Shaver at Imnaviat Creek). Our EAGER project would also provide a critical linkage between AON and NEON as the Alaska network of sites are planned to come on-linein 2012 and/or 2013. Landscape-scale monitoring is critical for stitching together the intricacies of the changing ecohydrolgy in the north.Non-technical abstract: The water cycle has a central role in Arctic climate change, and is coupled to alterations of land, rivers and lakes as well as permafrost processes, including shifts in the cycles of nutrients. Monitoring these changes is a central part of the NSF Arctic Observing Network (AON), a consortium of projects with site-specific responsibilities and measurement packages. The next frontier for AON is facilitation of approaches that better quantify landscape and regional eco-hydrological process by employing new analytical technologies (laser spectroscopy based water isotope analyzers) and integration of platforms, such as aircraft and satellites. This transformation of AON will initiate studies that quantify and integrate the heterogeneous landscapes of the Arctic tundra, while developing parallel capabilities to the NEON (National Ecological Observatory Network) program, thereby extending the relevance of AON to the continental-scale. We propose an EAGER project that applies a novel interdisciplinary approach by combining isotope geochemistry with boundary layer processes and measurements to monitor and measure the ecohydrology of tundra ecosystems and landscapes. This is a high-risk approach because it is a novel use of this particular instrument and it will change how Arctic ecohydrology is monitored and assessed. Our primary aim with this AON EAGER is to take the transformation step in our capacity to quantify hydrological processes at the landscape and region scale by: a) collaborating with Picarro Inc. (http://www.picarro.com/) in modifying the L2120-i for aircraft and thus landscape scale purposes and b) conducting a series of field/aircraft campaigns on the North Slope of Alaska. Our program would transform the measuring and monitoring of the terrestrial hydrological cycle beyond the point-based measurements of the past and that are currently in place with AON support at Imnaviat Creek. This project would also provide a critical linkage between AON and NEON as the Alaska network of sites are planned to come on-line in 2012 and/or 2013. Landscape-scale monitoring is critical for stitching together the intricacies of the changing ecohydrolgy in the north.

水文循环在北极气候变化中起着核心作用，并与陆地、水生和冰冻圈过程的变化相关联，包括地球化学循环的变化。监测这些变化是NSF北极观测网络（AON）的核心部分，该网络是一个具有特定地点责任和测量包的项目联盟。AON的下一个前沿是通过采用新的分析技术（基于激光光谱的水同位素分析仪）和平台（如飞机和卫星）的集成，更好地量化景观和区域生态水文过程的方法。AON的这种转变将启动量化和整合北极苔原异质景观的研究，同时开发与氖（国家生态观测网络）计划并行的能力，从而将AON的相关性扩展到大陆尺度。我们提出了一个EAGER项目，应用一种新的跨学科的方法，结合同位素地球化学与边界层过程和测量，监测和测量冻土带生态系统和景观的生态水文学。这是一种高风险的方法，因为它是对这一特定工具的一种新的使用，它将改变北极生态水文学的监测和评估方式。EAGER是我们项目的正确地点，因为这种水同位素光谱在飞机上的新应用是？高风险高回报研究和代表了一个根本不同的方法从实验室为基础的研究是现状。该项目的智力价值将通过解决这些主要问题来实现：a）在北方阿拉斯加的北极山麓和山麓-沿海平原边界的苔原生态系统中，生长季节和肩季期间水蒸气同位素的空间和时间模式是什么？在更有限的程度上，我们还问：B）什么是ET同位素签名与不同的生态系统类型和干扰（火和热岩溶）相对于背景水分？c）在上覆大气（生态系统边界高度以上）中生态系统ET信号的强度是多少？第一个问题侧重于飞行测量，第二个问题侧重于生态系统塔东海岸，第三个问题侧重于整合两个测量尺度。我们的项目的更广泛的影响和推广将通过初步分享我们的研究结果与科学界在美国地球物理联盟的秋季会议和学生作为我们的教学和研讨会的一部分，在阿拉斯加大学安克雷奇（UAA）和阿拉斯加大学费尔班克斯（UAF）。我们亦会与怡安的同事合作，在行程航班数据及信息后，进行数据分享及数据发布。AON EAGER的主要目标是通过以下方式实现我们在景观和区域尺度上量化水文过程的能力的转型：a）与Picarro Inc. (http：//www.picarro.com/）为飞机和景观规模目的修改L2120-i，以及B）在阿拉斯加北坡进行一系列野外/飞机活动。我们的计划将改变陆地水文循环的测量和监测，超越过去基于点的测量，目前在AON的支持下（即。图利克的奥伯鲍尔和韦尔克，因纳维亚特溪的布雷特哈特和剃须刀）。我们的EAGER项目还将提供AON和氖之间的关键联系，因为阿拉斯加的网站网络计划在2012年和/或2013年上线。景观尺度的监测是至关重要的拼接在一起的变化生态水文学的复杂性在north.Non-technical摘要：水循环在北极气候变化中发挥着核心作用，并耦合到土地，河流和湖泊的变化，以及永冻土过程，包括营养循环的变化。监测这些变化是NSF北极观测网络（AON）的核心部分，该网络是一个具有特定地点责任和测量包的项目联盟。AON的下一个前沿是通过采用新的分析技术（基于激光光谱的水同位素分析仪）和平台（如飞机和卫星）的集成，促进更好地量化景观和区域生态水文过程的方法。AON的这种转变将启动量化和整合北极苔原异质景观的研究，同时开发与氖（国家生态观测网络）计划并行的能力，从而将AON的相关性扩展到大陆尺度。我们提出了一个EAGER项目，应用一种新的跨学科的方法，结合同位素地球化学与边界层过程和测量，监测和测量冻土带生态系统和景观的生态水文学。这是一种高风险的方法，因为它是对这一特定工具的一种新的使用，它将改变北极生态水文学的监测和评估方式。AON EAGER的主要目标是通过以下方式实现我们在景观和区域尺度上量化水文过程的能力的转型：a）与Picarro Inc. (http：//www.picarro.com/）为飞机和景观规模目的修改L2120-i，以及B）在阿拉斯加北坡进行一系列野外/飞机活动。我们的计划将改变陆地水文循环的测量和监测，超越过去基于点的测量，目前在AON的支持下，在Imnaviat Creek进行测量。该项目还将提供AON和氖之间的关键联系，因为阿拉斯加的站点网络计划于2012年和/或2013年上线。景观规模的监测对于将北方不断变化的生态水文的复杂性联系起来至关重要。