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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >RETRIEVAL OF TROPOSPHERIC OZONE FROM SIMULATIONS OF NADIR SPECTRAL RADIANCES AS OBSERVED FROM SPACE
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RETRIEVAL OF TROPOSPHERIC OZONE FROM SIMULATIONS OF NADIR SPECTRAL RADIANCES AS OBSERVED FROM SPACE

机译：从空间观测到的纳谱辐射半径反演对流层臭氧。

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The global remote sensing of tropospheric ozone profiles is a critical environmental measurement to be performed by future satellite experiments. We have applied the method of nonlinear least squares in conjunction with an efficient and accurate line-by-line radiative transfer model to directly retrieve vertical profiles of tropospheric ozone from simulated dear sky, nadir-viewing radiances covering the entire 9.6-mu m ozone band. The simulations have been generated for the specifications of the tropospheric emission spectrometer (TES), a Fourier transform spectrometer with 0.032 cm(-1) resolution (half width at half maximum (HWHM), unapodized) being developed for NASA's Earth Observing System. Profile retrieval errors for background tropospheric ozone levels are characterized as a function of measurement noise, spectral resolution, and vertical resolution based on a linear error analysis and an initial guess profile with minimal constraint, hence negligible potential profile bias at all altitudes. The main conclusions of the study are that (1) for the TES experiment design, ozone profiles are retrievable to approximately +/-5% (1 sigma) for a vertical resolution of 5 km in the middle and upper troposphere, (2) the stratospheric portion of the profile must be retrieved directly from the measured nadir spectrum, (3) for equal measurement times and considering the effects of both systematic error and source radiance noise, an optimal spectral interferometer resolution exists that is close to the TES resolution (0.032 cm(-1); HWHM unapodized), and (4) ozone boundary layer retrievals are highly dependent on the contrast between that layer and the surface. The results from an ozone retrieval utilizing simulated radiances from an atmosphere defined by a radiosonde observation at Ascension Island are considered in the context of the solution of the nonlinear problem and the linear error analysis, The ozone retrieval analyses presented in this paper are principally concerned with the effects of measurement error and thus represent the optimal retrieval capability for the assumed design. However, the availability of the full high-resolution spectrum will enable the detection and mitigation of the systematic errors. [References: 32]
机译：对流层臭氧剖面的全球遥感是一项重要的环境测量，将由未来的卫星实验进行。我们已将非线性最小二乘法与有效且精确的逐行辐射传递模型结合使用，可从模拟的亲爱的天空直接获取对流层臭氧的垂直剖面，在覆盖整个9.6微米臭氧带的最低点观测辐射。已经针对对流层发射光谱仪（TES）的规格进行了仿真，该光谱仪是为NASA的地球观测系统开发的，分辨率为0.032 cm（-1）（半峰半宽（HWHM），未切趾）的傅立叶变换光谱仪。基于线性误差分析和具有最小约束的初始猜测轮廓，背景对流层臭氧水平的轮廓检索误差的特征是测量噪声，光谱分辨率和垂直分辨率的函数，因此在所有高度下的潜在轮廓偏差均可以忽略不计。该研究的主要结论是：（1）对于TES实验设计，在中，高对流层的垂直分辨率为5 km时，臭氧剖面可检索到大约+/- 5％（1 sigma），（2）必须直接从测得的最低点光谱中提取出平流层部分，（3）对于相等的测量时间，并考虑系统误差和源辐射噪声的影响，必须存在一个接近TES分辨率的最佳光谱干涉仪分辨率（0.032 cm（-1）;未切趾的HWHM）和（4）臭氧边界层的获取高度依赖于该层与表面之间的对比度。在解决非线性问题和线性误差分析的背景下，考虑了利用由升探岛上的探空仪观测所定义的大气模拟辐射产生的臭氧取回结果，本文主要介绍了臭氧取回分析。测量误差的影响，因此代表了假定设计的最佳检索能力。但是，完整的高分辨率光谱的可用性将能够检测和减轻系统误差。 [参考：32]

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