MMIA: Terrestrial Biospheric Responses to Atmospheric Deposition and Application to Integrated Assessment

摘要Rastetter 9711626对气候变化的最综合评估没有考虑大气化合物沉积对生态系统生物地球化学的影响。该项目将结合陆地生态系统对大气化学和气候变化的反应来研究这些影响，并将这些反应纳入综合评估框架。这项工作将强调硝酸盐沉积以及臭氧和二氧化硫暴露对全球生态系统的影响。与麻省理工学院化学-气候耦合模式(CCM)相耦合的MBL陆地生态系统模式。将改进TM，以包括硝酸盐投入和污染物暴露对生态系统功能的影响。TEM和CCM将能够预测森林未来的经济可行性及其对二氧化碳的吸收。由于预计未来对生态系统的影响将对二氧化碳、NOx、SO2和CO排放的相对组合敏感，因此将使用麻省理工学院全球和区域经济发展模型(EPPA)对人为排放的预测作为CCM和TEM的输入。人类活动、大气成分、气候和生态系统变化的综合影响和反馈将使用麻省理工学院全球综合评估系统模型进行研究，其中TEM子模型、CCM模型和EPPA模型是耦合的组件子模型。利用敏感性研究，预计这项工作的结果将有助于为今后研究大气沉积对生态系统的影响确定优先事项。

ABSTRACT Rastetter 9711626 Most integrated assessments of climate change do not consider the effects of the deposition of atmospheric compounds on ecosystem biogeochemistry. This project will study these effects in conjunction with the responses of terrestrial ecosystems to changes in atmospheric chemistry and climate and to incorporate these responses into an integrated assessment framework. The work will emphasize the effects of nitrate deposition and of ozone and sulfur dioxide exposure on global ecosystems. The MBL Terrestrial Ecosystem Model (TEM) coupled to the MIT Coupled Chemistry-Climate Model(CCM). TEM will be improved to include the influence of nitrate inputs and pollutant exposure on ecosystem function. TEM and CCM will enable predictions relevant to future economic viability of forests and their uptake of CO2. Because it is expected that the future effects on ecosystems will be sensitive to the relative mix of CO2, NOx, SO2 and CO emissions, predictions of anthropogenic emissions from the MIT model for global and regional economic development (EPPA) will be used as input to the CCM and TEM. The integrated effects and feedbacks of human activity, atmospheric composition, climate, and ecosystem change will be studied using the MIT Global System Model for Integrated Assessment of which TEM, CCM and EPPA are coupled component submodels. Using sensitivity studies, it is expected that the results of this work will help set priorities for future research on the effects of atmospheric deposition on ecosystems.