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: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=514726
• 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.

陆地生物圈在确定大气组成方面起着重要作用。大气组成的变化反过来可以显着影响生物圈。可靠地预测由于温室气体的大气丰富而发生的变化，例如二氧化碳（CO2），甲烷（CH4）和臭氧（O3），将需要对生物圈和大气之间的这种耦合进行改进的了解。拟议的研究计划将使用耦合的生物圈 - 大气模型以及先进的数据同化技术来利用新近可用的卫星观测值和对环境重要的痕量气体的表面测量，以更好地量化生物圈对对流层组成的影响。特别是，这项工作将基于四维变分数据同化方法开发多种物种生物圈 - 大气数据同化系统，该方法利用了大气气体的卫星观察结果，例如CO2，CH4和O3，以优化Outtion of Outtion of Outsecters在生物圈模型中控制关键生态系统的参数。在数据同化环境中，使用卫星观测值在土地表面建模社区中进行了巨大的努力，以更好地对生物圈过程进行建模。同样，大气化学建模社区的重点越来越重点，即利用日益增长的环境重要示踪气体的基于空间的观察结果，以更好地了解这些气体的全球分布。拟议的研究计划将把这些社区正在进行的工作联系起来，以提高人们对生物圈对对流层变化组成的贡献的了解。