Measurements of Hydroxyl Column Abundances: Implications for the Photochemistry of the Middle Atmosphere

小行星9730010 该项目将延续20年来弗里茨峰的羟基自由基（OH）柱丰度记录。羟基自由基是地球大气中最具化学活性的成分之一，在平流层臭氧的化学收支中发挥直接作用，并介导氯和氮的活性化合物和稳定化合物之间的转化。 这些是使用定制设计的高分辨率光度产品光谱仪对308 nm太阳光共振吸收的地面测量。将使用位于新墨西哥州采矿和技术研究所的第二台仪器进行更多的观测，重点是新的仪器和分析程序。将努力提高涉及太阳临边光谱多普勒频移的OH辅助测量的信噪比。将对光谱仪的杂散光特性进行全面分析，包括与其他仪器进行比较，如航天飞机上的MAHRSI仪器和喷气推进实验室的FTUV测量。分析工作将通过开发NCAR ROSE模型的一维版本和测试各种中间层机制继续进行。目前的光化学模型未能再现所观察到的地理，昼夜，季节和长期观察到的OH柱丰度的变化。

9730010 Minschwaner This project will extend the twenty-year record of the hydroxyl radical (OH) column abundances from Fritz Peak, CO. The hydroxyl radical is one of the most chemically active constituents in the Earth's atmosphere, playing a direct role in the chemical budget of stratospheric ozone and mediating the transformation between reactive and stable compounds of chlorine and nitrogen. These are ground-based measurements of the resonant absorption of sunlight at 308 nm using a custom designed, high resolution-luminosity product spectrometer. Additional observations will be made using a second instrument located at the New Mexico Institute for Mining and Technology, with emphasis on new instrumentation and analysis procedures. Efforts will be made to improve the signal to noise ratio in auxiliary measurements of OH which involve the Doppler shift in solar limb spectra. A comprehensive analysis will be undertaken of the stray light characteristics of the spectrometers, including comparisons to other instruments, such as the MAHRSI instrument on the Space Shuttle and the FTUV measurements at JPL. Analysis work will be continued through the development of a 1-D version of the NCAR ROSE model and testing of various mesospheric mechanisms. Current photochemical models fail to reproduce the observed geographic, diurnal, seasonal, and secular changes observed in the OH column abundances.