Modeling Heterogeneous Chemistry

这个项目的主要目标是将非均匀液滴化学参数化纳入气象模型，特别是MM5，可能还有EURAD。这种参数化将以线性算子的形式应用于云化学的标准批量参数化。修改后的欧拉模型将对来自文献的合理完整的案例研究的观察结果进行测试。然后进行一组敏感性研究，以解决四个具体问题：1)非均质云化学对化学沉积的影响程度如何？2)在什么样的空间和时间尺度上，这种异质化学是重要的？3)云中水的相分配如何定量地影响非均相化学的影响？4)是否存在非均质化学可能产生特别大影响的地理位置或排放/气候情景？这一努力将使人们更好地了解云中的化学和物理过程。

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.