【摘要】：基于高分辨率傅里葉變換紅外太陽吸收光譜可以準確測量大氣中二氧化碳的柱總量。基于光譜反演算法中的前向模型,分析了改變前向模型中不同參數(shù)和不同天頂角情況下對反演結(jié)果的影響及其原因。選取具有代表性的兩天的測量光譜,改變前向模型中連續(xù)體傾斜量值、內(nèi)部視場角、零偏置和多普勒效應(yīng)四個模型參數(shù),觀察不同先驗?zāi)Ｐ蛥?shù)的擾動對二氧化碳測量結(jié)果的影響。結(jié)果表明,不同模型參數(shù)的擾動引起反演的二氧化碳柱平均干空氣混合比(XCO_2)相對偏差并不一樣;不同的測量時間,相同參數(shù)擾動引起的二氧化碳含量相對偏差也不同。其中連續(xù)體傾斜量值的變化對反演結(jié)果的影響最大,其變化引起的相對偏差波動范圍在0.1%~0.2%之間;內(nèi)部視場角、零偏置和多普勒效應(yīng)的變化對反演結(jié)果影響較小,引起的二氧化碳的相對偏差分別在-0.045%~0.02%,-0.045%~0.015%和-0.03%~0.04%之間。最后用二氧化碳反演平均核解釋了反演誤差來源。研究結(jié)果對光譜反演算法中模型參數(shù)的設(shè)定和提高測量的準確度提供了理論依據(jù)。
[Abstract]:The total amount of carbon dioxide in the atmosphere can be accurately measured by high resolution Fourier transform infrared solar absorption spectroscopy. Based on the forward model in spectral inversion algorithm, the influence of different parameters and zenith angles in the forward model on the inversion results and its causes are analyzed. The representative two-day measurement spectrum is selected to change the model parameters of continuum inclination, internal field of view angle, zero bias and Doppler effect in the forward model. The effects of disturbance of different prior model parameters on the measurement results of carbon dioxide were observed. The results show that the relative deviation of the average dry air mixing ratio (XCO_2) of carbon dioxide column caused by the disturbance of different model parameters is not the same, and the relative deviation of carbon dioxide content caused by the disturbance of the same parameters is also different at different measurement time. Among them, the variation of continuum inclination value has the greatest influence on the inversion results, and the fluctuation range of relative deviation caused by the change is between 0.1% and 0.2%. The variation of internal field of view angle, zero bias and Doppler effect has little effect on the inversion results, and the relative deviation of carbon dioxide is between-0.045% and 0.015%, 0.045% and 0.015%, respectively. Finally, the source of inversion error is explained by the average kernel of carbon dioxide inversion. The results provide a theoretical basis for the setting of model parameters and the improvement of measurement accuracy in spectral inversion algorithm.
【作者單位】： 中國科學(xué)技術(shù)大學(xué)環(huán)境科學(xué)與光電技術(shù)學(xué)院;中國科學(xué)技術(shù)大學(xué)地球與空間科學(xué)學(xué)院;中國科學(xué)院安徽光學(xué)精密機械研究所環(huán)境光學(xué)與技術(shù)重點實驗室;
【基金】：國家自然科學(xué)基金項目(41405134,41575021,91544212,41605018) 安徽省自然科學(xué)基金項目(1608085MD79) 重點研發(fā)計劃青年基金項目(2016YFC0200800)資助
【分類號】：O433

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