Modeling Heterogeneous Chemistry

9705578 Hegg该项目的主要目标是将非均匀液滴化学的参数化入气象模式，特别是MM5，并可能纳入欧洲气象模式。该参数化将以线性运算符的形式应用于云化学的标准整体参数化。修正的欧拉模型将与文献中相当完整的案例研究的观察结果进行对比测试。然后将进行一系列敏感性研究，以解决四个具体问题：1)非均质云化学对化学沉积的影响有多大？2)在什么时空尺度上，非均质化学是重要的？3)云中水的相分配如何定量地影响非均质化学的影响？4)在地理位置或排放/气候情景中，非均质化学可能会产生特别大的影响吗？这一努力将导致对云中发生的化学和物理过程的更好理解。

9705578 Hegg The main objective of this project is to include a parameterization of heterogeneous droplet chemistry into meteorological models, in particular MM5, and possibly EURAD. This parameterization will be in the form of a linear operator applied to a standard bulk parameterization of cloud chemistry. The modified Eulerian model will be tested against observations for a reasonably complete case study from the literature. Then a set of sensitivity studies will be conducted to address four specific issues: 1) To what extent does heterogeneous cloud chemistry impact chemical deposition? 2) Over what spatial and temporal scales is this heterogeneous chemistry important? 3) How does the phase partitioning of water in the clouds quantitatively affect the impact of heterogeneous chemistry? 4) Are there geographic locations or emissions/climate scenarios where heterogeneous chemistry is likely to have a particularly large impact? This effort will lead to an improved understanding of chemical and physical processes occurring in clouds.