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.

尽管观测能力显著增强，但碳和水的表面通量仍然存在很大的不确定性，因为缺乏一个统一的框架来模拟碳和水循环，以利用新的观测结果，这反映了水文科学和碳科学之间的学科分离。研究人员将开发一种分析系统，通过结合来自众多飞机活动、卫星传感器和地面平台的观测结果，以及最先进的大气和陆地表面模型，同时量化区域尺度的碳和水通量。其目标是量化和大幅减少过去和未来对地表碳和水通量估计中的不确定性，并从同时使用多个数据流中提取有关碳-水循环的信息。综合正演和逆演模型框架将以碳和水文观测为基础。首先，研究人员将在北美地区实施一个正演模拟系统SiBRAMS，该系统以WLEF涡动相关测量塔为中心，那里有许多支持卫星塔，以促进观测信息的收集，以进行模型评估和改进。其次，他们将通过(a)在基于stilt的反演系统中加入水及其大气源/汇，(b)检查碳-水反演线性近似导致的误差，(c)对联合碳-水通量进行初始反演分析，(d)将反演结果与IHOP和COBRA实验的井约束观测结果进行比较，构建碳-水联合反演系统。该项目的主要成果包括开发一个分析框架，其中包括正演和反演模型，并利用与碳和水文相关的观测，以及对以WLEF塔为中心的北美区域相互一致的碳和水通量的估计。该项目的广泛影响具有教育意义，并有可能弥合水文碳群落和培育新的研究方向。