Collaborative Research: Determination of the Optical and Reactive Properties of Water Vapor of Relevance to Atmospheric Radiation, Cloud Physics and Chemistry

该项目正在研究大气中的水蒸气对近紫外线太阳辐射的吸收。 这项研究的结果可能有助于解决长期存在的模型和观测到的太阳能吸收在晴朗的天空条件下在大气中的差异。 该研究结合了实验室实验、现场测量和模拟，以研究关于水汽吸收在确定大气辐射平衡中的作用的至关重要的问题。该项目的目标是在光谱分辨率和间隔上与现有的卫星/地面臭氧监测仪器相当的情况下，对水汽近紫外吸收截面及其温度依赖性进行实验室测量，监测热带大气中的水汽近紫外光谱吸收，并评估包括水汽近紫外吸收对卫星/地面臭氧反演以及对大气辐射、环流和气候模型的影响。 实地测量将通过搭载国家海洋和大气管理局（诺阿）项目、赤道大西洋气溶胶和海洋科学考察（AEROSE）实地活动的紫外线辐射分光计来获得。臭氧和水汽对大气吸收的不同分配可能会改变大尺度大气环流的模式模拟。

This project is investigating water vapor absorption of near ultraviolet (NUV) solar radiation in the atmosphere. The results of this research may help resolve a long-standing discrepancy between modeled and observed solar energy absorption under clear sky conditions in the atmosphere. This research combines laboratory experiments, field measurements, and modeling to investigate critically important issues regarding the role of water vapor absorption in determining the radiative equilibrium of the atmosphere.The objectives of the project are to make laboratory measurements of water vapor near UV absorption cross sections and their temperature dependence at spectral resolution and intervals comparable to existing satellite/surface ozone monitoring instruments, to monitor water vapor near UV spectral absorption in the tropical atmosphere, and to evaluate the consequences of including this near UV absorption by water vapor on satellite/surface ozone retrievals and on models of atmospheric radiation, circulation, and climate. Field measurements will be acquired by piggybacking a UV radiation spectrometer on the National Oceanic and Atmospheric Administration (NOAA) project, the AERosols and Ocean Science Expeditions (AEROSE) field campaign in the equatorial Atlantic. A different partitioning of atmospheric absorption by ozone and water vapor could alter model simulations of large-scale atmospheric circulation.