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

对流层上层和平流层下层的水汽丰度是地球大气化学和气候状态的重要决定因素。预测这些高海拔地区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)全大气社区气候模式(WACCM)对此进行调查。他将把水的两种稳定同位素HDO和H_(18)O，以及相关的物理原理引入到模型中。此外，还将分析臭氧和一氧化碳等不凝结的中等寿命示踪剂。这项研究将集中在“热带对流层顶层”，这是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示踪进行测量进行比较。这些结果应该会让我们对空气到达平流层的途径以及控制平流层水蒸气浓度的机制有了新的了解。这项研究工作将与NCAR的WACCM团队合作完成。所开发的同位素模块将向一般社区提供，并可能包括在WACCM的标准版本中。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.