Upper Troposphere/Lower Stratosphere Water Vapor in the National Center for Atmospheric Research Whole-Atmosphere Climate/Chemistry Model

对流层上部和平流层下部的水汽含量是地球大气化学和气候状态的重要决定因素。 在这些高海拔地区预测水汽的能力仍然是大气环流模式中最重要的挑战之一。 PI将使用国家大气研究中心（NCAR）的全大气社区气候模型（WACCM）进行调查。 他将在模型中引入两种稳定的水同位素HDO和H218O以及相关的物理学。 此外，还将分析不凝结的中等寿命示踪剂，如臭氧和一氧化碳。 研究将集中在“热带对流层顶层”，即对流层和平流层之间的过渡区域。 几年来的模型积分将与使用臭氧，一氧化碳和水的同位素等痕迹的测量进行比较。 这些结果将为空气到达平流层的途径和控制平流层水汽浓度的机制提供新的认识。研究工作将与NCAR的WACCM团队合作完成。 开发的同位素模块将提供给一般社区，并可能纳入WACCM的标准版本。 这项研究也将为研究生学习提供良好的机会。

The abundance of water vapor in the upper troposphere and lower stratosphere is an important determinant of the chemical and climatic state of the earth's atmosphere. The ability to predict water vapor at these high altitudes remains one of the most important challenges in general circulation models. The PI will investigate this using the National Center for Atmosphere Research (NCAR) Whole Atmosphere Community Climate Model (WACCM). He will introduce two stable isotopes of water, HDO and H218O, and the associated physics, into the model. In addition, medium-lived tracers, such as ozone and carbon monoxide, that do not condense will be analyzed. The research will be focused in the "tropical tropopause layer", a transition region between the troposphere and the stratosphere. Model integrations for several years will be compared with measurements using traces such as ozone, carbon monoxide, and the isotopes of water. The results should provide new understanding of the pathways by which air reaches the stratosphere and of the mechanisms that control the stratospheric water vapor concentration. The research work will be done in collaborating with the WACCM team at NCAR. The isotopic modules developed will be made available to the general community and, possibly, be included in the standard version of the WACCM. The research will also provide good opportunities for graduate studies.