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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MIDDLE ATMOSPHERIC OZONE AND TEMPERATURE RESPONSES TO SOLAR IRRADIANCE VARIATIONS OVER 27-DAY PERIODS
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MIDDLE ATMOSPHERIC OZONE AND TEMPERATURE RESPONSES TO SOLAR IRRADIANCE VARIATIONS OVER 27-DAY PERIODS

机译：中间臭氧和温度对27天期间太阳辐照度变化的响应

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A one-dimensional (1-D), photochemical-radiative, time-dependent model with vertical diffusion is developed to investigate the response of ozone in the middle atmosphere to solar UV irradiance variations over 27-day solar rotation periods. The model, based on equinoctial conditions at the equator, extends from 10 to 100 km with a vertical resolution of 0.5 km and employs an approximation based on photochemical families. The amplitudes of the wavelength-dependent solar UV variation over 27-day periods as observed by the Upper Atmosphere Research Satellite (UARS) are adopted;in the model. The results of the 1-D model show that at altitudes of 60-80 km, ozone decreases with increasing solar irradiance at Lyman alpha. The amplitude of the ozone variation is about 1% of its equilibrium value at about 70-75 km. Below 50 km an ozone increase is found due to increased photolysis of molecular oxygen by increased solar irradiance over the Herzberg continuum. The peak of this ozone increase (about 0.3%) is located at about 35 km. The peaks of the ozone oscillation in the upper stratosphere precede those of the solar oscillation as a result of the strong influence of the temperature feedback on the ozone response through the temperature dependent chemical reaction rates. A modified NCAR 2-D model is also used to study the short-term ozone response. Comparison of the 2-D and 1-D results shows that horizontal transport increases the phase lag of the temperature response. This large phase lag is essential to simulate the observed ozone response given by Nimbus 7 solar backscattered ultraviolet observations. The positive temperature response around 70 km observed by Nimbus 7 stratospheric and mesospheric sounder data is confirmed by the UARS microwave limb sounder temperature observation, but neither 1-D nor 2-D models are able to reproduce this observed temperature response at this level. The effects of the exothermic chemical heating and vertical diffusion coefficient on the mesospheric temperature and ozone responses are discussed. The relative response of ozone and temperature to normalized solar variations over different spectral regions and the roles of different photochemical families in the ozone response are presented. Finally, the seasonal and latitudinal (up to middle latitudes) variations in the ozone response are evaluated with the use of the 2-D model. [References: 59]
机译：建立了具有垂直扩散的一维（1-D），光化学辐射，时间相关的模型，以研究中层大气中臭氧对太阳旋转27天期间太阳紫外线辐射变化的响应。该模型基于赤道的等离子条件，从10 km延伸到100 km，垂直分辨率为0.5 km，并使用基于光化学族的近似值。在模型中，采用了由上层大气研究卫星（UARS）观测到的27天周期内与波长有关的太阳紫外线变化的幅度。一维模型的结果表明，在60-80公里的高度，随着Lymanα处太阳辐射的增加，臭氧会减少。臭氧变化的幅度约为其平衡值（在约70-75 km处）的1％。在50公里以下，由于在Herzberg连续体上增加的太阳辐照度而增加了分子氧的光解作用，发现臭氧增加。臭氧增加量的峰值（约0.3％）位于约35 km。由于温度反馈通过取决于温度的化学反应速率对臭氧响应的强烈影响，高层平流层中臭氧振荡的峰值先于太阳振荡的峰值。修改后的NCAR 2-D模型也用于研究短期臭氧响应。 2-D和1-D结果的比较表明，水平传输会增加温度响应的相位滞后。这种大的相位滞后对于模拟Nimbus 7太阳反向散射紫外线观测所给出的观测到的臭氧响应至关重要。通过Nimbus 7平流层和中层测深仪数据观测到的约70 km处的正温度响应已通过UARS微波肢体测深仪温度观测得到证实，但是1-D和2-D模型都无法在此水平上重现此观测到的温度响应。讨论了放热化学加热和垂直扩散系数对中层温度和臭氧响应的影响。介绍了臭氧和温度对不同光谱区域上归一化的太阳变化的相对响应，以及不同光化学家族在臭氧响应中的作用。最后，使用2-D模型评估了臭氧响应的季节性和纬度（直至中纬度）变化。 [参考：59]

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