Wei Peng-Sheng, Hsieh Yin-Chih, Chiu Hsuan-Han, Yen Da-Lun, Lee Chieh, Tsai Yi-Cheng, Ting Te-Chuan
Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
Heliyon. 2018 Oct 6;4(10):e00785. doi: 10.1016/j.heliyon.2018.e00785. eCollection 2018 Oct.
Absorption coefficient affected by carbon dioxide concentration and optical path length responsible for temperature or global warming across the troposphere layer, which is less than the altitude of 10 km in the atmosphere, is systematically presented in this work. Solar irradiation within a short wavelength range can be absorbed, scattered and transmitted by the atmosphere, and absorbed and reflected by the Earth's surface. Radiative emission in high wavelength ranges from the Earth's surface at low temperature can be absorbed by atmospheric water vapor, carbon dioxide and other gases. Unbalance of radiation thus results in the atmosphere to act as the glass of a greenhouse and increase atmospheric temperature. Even though global warming strongly affects the life of the human being, the cause of global warming is still controversial. This work thus proposes a fundamental and systematical unsteady one-dimensional heat conduction-radiation model together with exponential wide band model to predict absorption coefficients affected by concentration, temperature, optical path lengths and radiation correlated parameters in different bands centered at 15, 4.3, 2.7, and 2 μm of carbon dioxide across the troposphere layer. It shows that absorption coefficient required for calculating heat transfer is strongly affected by carbon dioxide concentration and optical path length across the troposphere. Relevant values of the latter should be greater than 5,000 m. Absorption coefficients in the band centered at 4.3 μm subject to a chosen optical path length of m increase from 0.04 m and 0.165 mat the tropopause to 0.11 m and 0.44 m at the Earth's surface for carbon dioxide concentrations of 100 and 400 ppm, respectively. A more relevant and detailed temperature profile across the troposphere is presented.
本文系统地介绍了对流层（大气中高度小于10千米的一层）中受二氧化碳浓度和光程长度影响的吸收系数，这些因素与温度或全球变暖有关。短波长范围内的太阳辐射可被大气吸收、散射和透射，并被地球表面吸收和反射。来自低温地球表面的高波长范围的辐射发射可被大气中的水汽、二氧化碳和其他气体吸收。辐射不平衡导致大气起到温室玻璃的作用，从而使大气温度升高。尽管全球变暖对人类生活有强烈影响，但其成因仍存在争议。因此，本文提出了一个基本的、系统的非稳态一维热传导 - 辐射模型以及指数宽带模型，以预测对流层中不同波段（以二氧化碳的15、4.3、2.7和2微米为中心）受浓度、温度、光程长度和辐射相关参数影响的吸收系数。结果表明，计算热传递所需的吸收系数受对流层中二氧化碳浓度和光程长度的强烈影响。光程长度的相关值应大于5000米。对于100 ppm和400 ppm的二氧化碳浓度，在选定光程长度为 米时，以4.3微米为中心的波段中的吸收系数分别从对流层顶的0.04米和0.165米增加到地球表面的0.11米和0.44米。文中还给出了更相关、更详细的对流层温度剖面。
