Vegetation-Air Exchange in Non-ideal Conditions

该项目的目标是通过对现有数据和正在进行的实地实验数据进行严格分析，调查在非理想条件下（丘陵地形、斑块状树冠、自由对流、降雨和稳定分层）森林植被上控制二氧化碳、热量和水蒸气的地表-空气交换的过程。这项研究的主要动机是，科学界对长期的微气象研究有相当大的兴趣，以了解森林生态系统在大气碳、能源和水循环中的作用。在这些非理想条件下的大气过程的定量知识是必要的。该项目的最终目标是推动微气象理论超越传统的理想条件。数据将通过与各种研究人员的合作获得。这些数据将来自1994年和1996年的BOREAS（北方生态系统-大气研究）实验和在另外两个森林地点正在进行的实验，一个是加拿大多伦多附近平坦地形上的AmeriFlux地点，另一个是康涅狄格州中等地形上的新地点。这些数据包括基于塔的通量观测、气象学、土壤室、土壤碳和物理性质以及生物测定监测。

The objective of this project is to investigate processes that control surface-air exchange of carbon dioxide, heat and water vapor over forest vegetation in non-ideal conditions (hilly terrain, patchy canopy, free convection, rain and stable stratification) through critical analysis of existing data and data from ongoing field experiments. The primary motivation for this research is that there is considerable interest among the scientific community in long-term, micrometeorological studies to understand the role of forest ecosystems in atmospheric carbon, energy and water cycles. Quantitative knowledge of atmospheric processes in these non-ideal conditions is needed. The ultimate goal of this project is to advance micrometeorological theory beyond the traditional focus on ideal conditions. Data will be acquired through collaborations with various researchers. They will come from the 1994 and 1996 BOREAS (Boreal Ecosystem-Atmosphere Studies) experiments and from ongoing experiments at two other forest sites, an AmeriFlux site on flat terrain near Toronto, Canada, and a new site on moderate topography in Connecticut. The data include tower-based flux observation, meteorology, soil chamber, soil carbon and physical property, and biometric monitoring.