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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A CORRECTION FOR TOTAL OZONE MAPPING SPECTROMETER PROFILE SHAPE ERRORS AT HIGH LATITUDE
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A CORRECTION FOR TOTAL OZONE MAPPING SPECTROMETER PROFILE SHAPE ERRORS AT HIGH LATITUDE

机译：高纬度臭氧映射谱仪总形状误差的校正

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The total ozone mapping spectrometer (TOMS) ozone measurement is derived by comparing measured backscatter ultraviolet radiances with theoretical radiances computed using standard climatological ozone profiles. Profile shape errors occur in this algorithm at high optical path lengths whenever the actual vertical ozone distribution differs significantly from the standard profile used. These errors are estimated using radiative transfer calculations and measurements of the actual ozone profile. These estimated errors include a shortterm component resulting from day-to-day variability in profile shape that gives rise to a standard deviation of 10% in total column ozone amount, as well as a systematic error in the long-term trend at very high solar zenith angles. The trend error resulting from the long-term changes in the ozone profile shape is estimated using measurements from the solar backscattered ultraviolet instrument. At the maximum retrieval solar zenith angle of 88 degrees, these calculations indicate that TOMS long-term ozone depletions may be overestimated by 5% per decade. For trend studies that are restricted to latitudes lower than 60 degrees (a maximum of 83 degrees solar zenith angle), this error is reduced to no more than 1-2% per decade. Differential impact of the profile shape error at the various TOMS wavelength pairs indicates that profile shape information is present in the TOMS measurements at high solar zenith angles. An interpolation method internal to TOMS is proposed to extract this information. It improves the retrieval at high solar zenith angle, reducing the shortterm variability to a standard deviation of 5%, and essentially eliminates the long-term error. The set of standard profiles used in the algorithm are adjusted based on an analysis of empirical orthogonal functions derived from a composite climatology of Stratospheric Aerosol and Gas Experiment II and balloonsonde profile measurements. [References: 12]
机译：总臭氧制图谱仪（TOMS）臭氧测量值是通过将测得的反向散射紫外线辐射度与使用标准气候臭氧分布图计算出的理论辐射度进行比较得出的。每当实际垂直臭氧分布与所使用的标准轮廓明显不同时，在此算法中，在高光程长度下，轮廓形状就会发生错误。这些误差是通过辐射传输计算和实际臭氧剖面的测量值估算的。这些估计的误差包括由轮廓形状的日常变化引起的短期成分，该变化导致色谱柱总臭氧量的标准偏差为10％，以及在太阳非常高的情况下长期趋势中的系统误差。天顶角。臭氧剖面形状的长期变化导致的趋势误差是使用太阳反向散射紫外仪器的测量值估算的。在88度的最大太阳太阳顶角时，这些计算表明，TOMS的长期臭氧消耗量可能每十年被高估5％。对于仅限于低于60度（太阳天顶角最大为83度）的纬度的趋势研究，该误差降低到每十年不超过1-2％。轮廓形状误差在各种TOMS波长对上的差异影响表明，轮廓形状信息以高太阳天顶角存在于TOMS测量中。提出了TOMS内部的插值方法来提取此信息。它改善了高太阳天顶角下的反演，将短期变化降低到5％的标准偏差，并从根本上消除了长期误差。该算法中使用的标准轮廓集是基于对经验正交函数的分析而调整的，该正交函数是从平流层气溶胶和气体实验II的复合气候学和球囊轮廓测量得到的。 [参考：12]

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