Global validation of empirically corrected EP‐Total Ozone Mapping Spectrometer (TOMS) total ozone columns using Brewer and Dobson ground‐based measurements
Global validation of empirically corrected EP‐Total Ozone Mapping Spectrometer (TOMS) total ozone columns using Brewer and Dobson ground‐based measurements
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DOI：
10.1029/2010jd014178
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发表时间：
2010-10
影响因子：
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通讯作者：
M. Antón;M. Koukouli;M. Kroon;R. Mcpeters;G. Labow;D. Balis;A. Serrano
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文献类型：
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作者：
M. Antón;M. Koukouli;M. Kroon;R. Mcpeters;G. Labow;D. Balis;A. Serrano
[1]本文重点介绍了全球范围内的验证经验校正版本8总臭氧柱数据集获得的美国宇航局总臭氧绘图光谱仪（TOMS）在1996-2004年期间，该仪器在地球探测器（EP）卫星平台上飞行。这一分析是基于使用空间共址的地面测量多布森和布鲁尔风速计。原始的EP-TOMS V8臭氧柱总量数据集也用这些地面测量数据进行了验证，以量化经验校正所取得的改进，这是由于2000年以后出现的仪器退化问题所必需的，而这些问题无法通过正常校准技术进行校正。经EP-TOMS V8修正的臭氧总量数据显示，2000年后，在原始EP-TOMS V8观测中检测到的约0.33%的显著负偏差有了显著改善。无论是原始的还是修正后的EP-TOMS卫星臭氧总量数据集都没有显示出对纬度的显著依赖。此外，两个EP-TOMS卫星数据集高估了布鲁尔测量小太阳天顶角（SZA）和低估大SZA，解释了显着的季节性（1.5%）为无云和多云条件。相反，EP-TOMS和多布森之间的相对差异表明，在无云条件下几乎不依赖于SZA，而在多云条件下依赖性很强（从小SZA的+2%到高SZA的-1%）。卫星地面相对差异对臭氧总量的依赖性表明，对于250多布森单位以上的柱值，两者之间具有良好的一致性。我们的主要结论是，升级到TOMS V8校正的臭氧总量数据呈现出显着的改善。然而，尽管EP-TOMS数据质量很高，但不应将其用作趋势分析的来源，因为EP-TOMS臭氧趋势是使用NOAA-16和NOAA-17太阳后向散射紫外线/2数据作为外部参考进行经验性校正的，因此，不再将其视为独立的观测。
[1] This article focuses on the global-scale validation of the empirically corrected Version 8 total ozone column data set acquired by the NASA Total Ozone Mapping Spectrometer (TOMS) during the period 1996–2004 when this instrument was flying aboard the Earth Probe (EP) satellite platform. This analysis is based on the use of spatially co-located, ground-based measurements from Dobson and Brewer spectrophotometers. The original EP-TOMS V8 total ozone column data set was also validated with these ground-based measurements to quantify the improvements made by the empirical correction that was necessary as a result of instrumental degradation issues occurring from the year 2000 onward that were uncorrectable by normal calibration techniques. EP-TOMS V8-corrected total ozone data present a remarkable improvement concerning the significant negative bias of around ∼3% detected in the original EP-TOMS V8 observations after the year 2000. Neither the original nor the corrected EP-TOMS satellite total ozone data sets show a significant dependence on latitude. In addition, both EP-TOMS satellite data sets overestimate the Brewer measurements for small solar zenith angles (SZA) and underestimate for large SZA, explaining a significant seasonality (∼1.5%) for cloud-free and cloudy conditions. Conversely, relative differences between EP-TOMS and Dobson present almost no dependence on SZA for cloud-free conditions and a strong dependence for cloudy conditions (from +2% for small SZA to −1% for high SZA). The dependence of the satellite ground-based relative differences on total ozone shows good agreement for column values above 250 Dobson units. Our main conclusion is that the upgrade to TOMS V8-corrected total ozone data presents a remarkable improvement. Nevertheless, despite its quality, the EP-TOMS data for the period 2000–2004 should not be used as a source for trend analysis since EP-TOMS ozone trends are empirically corrected using NOAA-16 and NOAA-17 solar backscatter ultraviolet/2 data as external references, and therefore, they are no longer considered as independent observations.