Collaborative Research: Isentropic Chemical Transport Modeling

该奖项是为合作研究项目提供支持的两个奖项之一。同伴奖授予加州大学圣巴巴拉分校Mahowald博士（ATM-9902987）。该项目涉及在等熵坐标下开发化学输运模型。等熵坐标具有潜在的优势，可以更好地捕捉大气的传输特性，因为它们代表中性浮力的表面，因此是一种更自然的传输坐标。研究的出发点是一个现有的化学输运模型，即美国国家大气研究中心开发的MATCH模型。将模型的垂直坐标转换为等熵系统，并对子网格尺度混合和边界层混合参数化进行相应的修改。预计该模式将更好地捕捉对流层顶附近输送的性质，从而有助于更好地了解平流层-对流层交换过程。主要研究人员将通过将痕量气体输运的模拟结果与其他模型结果和观测结果进行比较，来检验该模型的真实性。该项目由大气化学和大尺度动态气象项目联合支持。

This award is one of two made to provide support for a collaborative research project. The companion award is to Dr. Mahowald, University of California at Santa Barbara (ATM-9902987). The project involves the development of a chemical transport model in isentropic coordinates. Isentropic coordinates have the advantage of potentially better capturing the transport characteristics of the atmosphere because they represent surfaces of neutral buoyancy and, thus, are a more natural coordinate for transport. The starting point is an existing chemical transport model, the MATCH model developed at the National Center for Atmospheric Research. This model's vertical coordinate will be converted to an isentropic system and the sub-grid scale mixing and boundary layer mixing parameterizations modified accordingly. It is expected that, in particular, the model will better capture the nature of the transport near the tropopause and thereby contribute to better understanding of stratospheric-tropospheric exchange processes. The principal investigators will test the model's realism by comparing simulations of trace gas transport with other model results and with observations. This project is supported jointly by the Atmospheric Chemistry and Large-scale Dynamic Meteorology Programs.