The Study Of Airglow By Nonlinear Gravity Wave And The Development Of The Total Ozone Spectrometer

Gravity wave and ozone are two interesting topics in the middle and upper atmosphere. In this dissertation, they are studied by numerical simulation and instrument development respectively.In section one, by using FICE scheme and TIME-GCM, a model of trace gases and OH airglow affected by gravity wave is set up, then the propagation of nonlinear gravity wave and the effect on trace gases and OH airglow are analyzed. The result shows gravity wave excited by tropospause forcing can propagate stably to the mesosphere through the stratosphere so that energy and momentum can be transferred from one region to another. In this process, gravity wave undergoes growth, overturning, convection and breaking. And the no-isothermal structure can accelerate the breaking of gravity wave in mesospause, and the breaking of gravity wave is an important source of convection and small-scale waves. The propagation of gravity wave will affect the distribution of minor species. The breaking of gravity wave accelerates the downward transport of atomic oxygen, some smaller-scale structures appear on the horizontal distribution of atomic oxygen number density , and other chemical species are also affected due to the chemical reaction with atomic oxygen and the propagation of gravity wave.The OH airglow volume emission rate has an obvious response to the breaking gravity wave and atomic oxygen. The nonlinear propagation of smaller vertical wavelength gravity waves can induce the double-peaked structure in the OH airglow. The results can explanation some sporadic measurements of OH airglow and can provide a good indication for studying the characteristic of nonlinear gravity wave by using OH airglow measurement. The Total Ozone Spectrometer can provide daily global coverage of total ozone by measuring the solar UV irradiances and earth backscattered radiances at six discrete wavelength channels. In section two, based on the scheme stage for the instrument, the generally overview of instrument development is introduced .A serial of tests and calibrations to the instrument properties are performed, then some improving measures are also proposed. In addition, a preliminary research for total ozone retrieval from the solar backscatter ultraviolet data are achieved, and the selection of wavelength-pair for different solar zenith angles is analyzed, which lay a foundations for next work.