Deriving Mutually-Consistent Carbon-Water Fluxes at the Regional Scale from Observations by Using a Coupled Biosphere-Atmosphere Model

使用生物圈-大气耦合模型从观测中推导出区域尺度上相互一致的碳-水通量

• 批准号: 1011975
• 负责人: Lixin Lu
• 金额: $ 19.1万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1011975&HistoricalAwards=false
• 关键词: Deriving; Mutually; Consistent; Carbon; Water

Despite significant enhancements in observational capability, substantial uncertainties remain in surface fluxes of carbon and water due to the lack of a single, consistent framework that models both the carbon and water cycles to make use of new observations, reflecting the disciplinary separation between the hydrological and carbon sciences. The investigators will develop an analysis system that simultaneously quantifies regional-scale carbon and water fluxes by combining observations from numerous aircraft campaigns, satellite sensors, and ground-based platforms with state-of-the-art models of the atmosphere and land surface. The objectives are to quantify and significantly reduce uncertainties in past and future estimates of surface carbon and water fluxes and extract information on the carbon-water cycles from simultaneous use of multiple data streams.The integrated forward and inverse modeling framework will be anchored to both carbon- and hydrologic observations. First, the investigators will implement a forward modeling system SiBRAMS over a North American domain, which is centered over the WLEF eddy covariance measurement tower where a number of support satellite towers are available, to facilitate the gathering of observational information for model evaluation and improvement. Second, they will build the joint carbon-water inversion system by (a) adding water and its atmospheric sources/sinks to STILT-based inversion system, (b) examining errors resulting from linear approximation in carbon-water inversion, (c) conducting initial inversion analysis of joint carbon-water fluxes, and (d) comparing inversion results with well-constraint observations from IHOP and COBRA experiments. Main deliverables from this project include the development of an analysis framework, which includes both forward and inverse models and makes use of both carbon- and hydrologically related observations, and estimates of mutually-consistent carbon and water fluxes over a North American domain centered around WLEF tower. Broad impacts of this project are educational and in the potential to bridge the hydrology-carbon communities and foster new research directions.

尽管观察能力的显着增强，但由于缺乏单个一致的框架，碳和水的表面通量仍然存在，该框架对碳和水周期进行了建模以利用新观测，这反映了水文科学和碳科学之间的纪律间隔。调查人员将开发一个分析系统，该系统通过结合众多飞机运动，卫星传感器以及地面平台的观察结果与大气和地表的最先进模型，从而同时量化区域碳和水通量。这些目标是在过去和将来的表面碳和水通量估计中量化并显着减少不确定性，并通过同时使用多个数据流来提取有关碳水周期的信息。集成的前进和反向建模框架将固定在碳和水力学观察结果上。首先，调查人员将在北美领域实施一个前向建模系统Sibrams，该系统以WLEF涡流协方差测量塔为中心，那里有许多支持卫星塔，以促进观察信息以进行模型评估和改进。其次，他们将通过（a）将水及其大气来源/下沉添加到基于高架的反转系统中，（b）检查碳 - 水反转线性近似引起的错误，（c）对碳水流量的初始反转分析，将与Inserion conters进行比较i imement Interim i i的初始反转分析。该项目的主要可交付成果包括开发分析框架，其中包括前进和反向模型，并利用碳和与水文相关的观察结果，以及对以WLEF塔为中心的北美域上相互持续的碳和水通量的估计。该项目的广泛影响是教育性的，有可能弥合水文学碳社区并促进新的研究方向。