Theoretical Studies of the Chemical Composition of the Earth's Atmosphere

这项研究继续了一个侧重于研究影响平流层和对流层组成的过程的理论研究计划。其目标是加强对造成大气成分迅速变化的因素的了解。将对中纬度平流层进行研究，利用航天飞机上的ATMOS实验和其他数据来源进行测量，以测试和改进目前的光化学模型。这项工作还将包括开发与化学和气象示踪剂有关的半经验模型，允许重建平流层中的三维示踪剂分布，并应用于分析最近飞往极地地区的飞机任务中获得的数据。对流层的研究包括开发一个二维模型，使用我们的三维示踪模型进行校准，以调查导致现在和过去甲烷、一氧化碳和氮氧化物丰度变化的因素。该三维模型将用于研究南极洲硝酸盐在冰上的季节性沉积，以及对行星边界层的光化学和云过程的选择性研究。

This research continues a program of theoretical research focusing on studies of processes influencing the composition of both the stratosphere and troposphere. The objective is to enhance understanding of factors responsible for the rapid changes taking place in the composition of the atmosphere. Studies of the mid-latitude stratosphere using measurements from the shuttle-borne ATMOS experiment, and other data sources, to test and improve current photochemical models will be carried out. This work will also include the development of semi- empirical models relating chemical and meteorological tracers, allowing reconstruction of 3-dimensional tracer distributions in the stratosphere, with applications to analyses of data obtained in recent aircraft missions to the polar regions. Studies of the troposphere include development of a 2-dimensional model, calibrated using our 3-dimensional tracer model, to investigate factors responsible for present and past changes in the abundance of methane, carbon monoxide and the oxides of nitrogen. The 3- dimensional model will be applied to study seasonal deposition of nitrate to ice in Antarctica, and selected investigations of photochemical and cloud processes in the planetary boundary layer.