Coupled biosphere-atmosphere chemical data assimilation: improved understanding of the impact of biosphere-atmosphere exchange on atmospheric composition

生物圈-大气耦合化学数据同化：更好地了解生物圈-大气交换对大气成分的影响

• 批准号: 293304-2009
• 负责人: Jones, Dylan
• 金额: $ 2.91万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=525865
• 关键词: Coupled; biosphere; atmosphere; chemical; data

The terrestrial biosphere plays an important role in determining the composition of the atmosphere; and changes in atmospheric composition, in turn, can significantly impact the biosphere. Reliably predicting global climate change due to changing atmospheric abundances of greenhouse gases, such as carbon dioxide (CO2), methane (CH4), and ozone (O3), will require an improved understanding of this coupling between the biosphere and the atmosphere. The proposed research program will use a coupled biosphere-atmosphere model together with advanced data assimilation techniques to exploit newly available satellite observations and surface measurements of environmentally important trace gases to better quantify the influence of the biosphere on the composition of the troposphere. In particular, the work will develop a multi-species biosphere-atmosphere data assimilation system based on a four-dimensional variational data assimilation approach, which exploits satellite observations of atmospheric gases such CO2, CH4, and O3 to optimize the parameters that govern key ecosystem processes in the biospheric model. There has been significant effort in the land-surface modelling community using satellite observations in a data assimilation context to better model biospheric processes. Similarly, there is increasing focus in the atmospheric chemistry modelling community on exploiting the growing wealth of space-based observations of environmentally important tracer gases to better understand the global distribution of these gases. The proposed research program will link the on-going work in these communities to obtain an improved understanding of the contribution of the biosphere to the changing composition of the troposphere.

陆地生物圈在决定大气的组成方面发挥着重要作用;而大气组成的变化反过来又会对生物圈产生重大影响。要可靠地预测大气中二氧化碳（CO2）、甲烷（CH 4）和臭氧（O3）等温室气体含量变化引起的全球气候变化，就需要更好地理解生物圈和大气之间的这种耦合。拟议的研究方案将使用一个生物圈-大气耦合模型以及先进的数据同化技术，利用新获得的卫星观测数据和对环境重要的痕量气体的地面测量数据，更好地量化生物圈对对流层组成的影响。特别是，这项工作将开发一个基于四维变分数据同化方法的多物种生物圈-大气数据同化系统，该系统利用卫星对大气气体（如CO2、CH 4和O3）的观测，优化生物圈模型中控制关键生态系统过程的参数。在陆地表面建模界，在数据同化的背景下利用卫星观测，为更好地模拟生物圈过程作出了重大努力。同样，大气化学建模界越来越重视利用对环境重要的示踪气体的空间观测的日益丰富，以更好地了解这些气体的全球分布情况。拟议的研究计划将把这些社区正在进行的工作联系起来，以更好地了解生物圈对对流层组成变化的贡献。