Interhemispheric Transport: Mechanistic Studies for Understanding and Improving 3-D Chemical Models

摘要ATM-9401216哈特利，达纳格鲁吉亚技术标题：半球间运输：理解和改进3-D化学模型的机制研究 该提案研究的主要目标是更好地了解控制半球之间空气包裹交换的机制：这些信息将用于改进目前无法充分模拟半球间交换的3-D化学传输模型。 对于某些模型，这将涉及明确评估和改进模型动态。 然而，对于使用预先确定的风场的传输模式，所涉及的过程的参数化将是必要的。 为了实现这些目标，将结合对观测和大气环流模式输出的分析来研究跨赤道输送的主要位置、季节性和年际变化。 还将进行研究，以诊断与半球之间质量交换有关的动力学过程。 实现这些目标的具体步骤包括分析先前完成的社区气候模型2（CCM 2）中的CFCl 3运输模拟，并强制使用气候学海面温度（SST）来确定半球之间运输的位置和季节性。 PI还将使用CFCl 3作为示踪剂运行CCM 2，使用观测到的SST来检查厄尔尼诺/南方涛动（ENSO）对半球间交换的年际变化的影响。 参数化经过测试后，将可在化学品迁移模型中普遍使用。

Abstract ATM-9401216 Hartley, Dana Georgia Tech Title: Interhemispheric Transport: Mechanistic Studies for Understanding and Improving 3-D Chemical Models The primary goal of the proposal research is to obtain an improved understanding of what mechanisms control the exchange of air parcels between hemispheres: This information will be used to improve 3-D chemical transport models that presently do not adequately simulate interhemispheric exchange. For some models this will involve explicitly assessing and improving the model dynamics. However, for transport models that use predetermined wind fields a parameterization of the processes involved will be necessary. In order to achieve these goals, a combination of analyses of both observations and general circulation model outputs will be employed to study the dominant locations, seasonality, and interannual variability of cross-equatorial transport. Studies will also be performed to diagnose the dynamical processes related to the exchanged of mass between hemispheres. The specific steps to meet these goals include analyzing previously completed simulations of CFCl3 transport in the Community Climate Model 2 (CCM2) forced with climatological sea surface temperatures (SSTs) to determine the location and seasonality of the transport between hemispheres. The PI will also perform runs of the CCM2, with CFCl3 as the tracer, using observed SSTs to examine the influence of the El Nino/South Oscillation (ENSO) on interannual variability of interhemispheric exchange. After the parameterzation has been tested, it will be available for general use in chemical transport models.