The impact of the ozone effective temperature on satellite validation using the Dobson spectrophotometer network
The impact of the ozone effective temperature on satellite validation using the Dobson spectrophotometer network
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DOI：
10.5194/amt-9-2055-2016
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发表时间：
2016-05
影响因子：
3.8
通讯作者：
M. Koukouli;Marina Zara;C. Lerot;K. Fragkos;D. Balis;M. Roozendael;M. Allart;Ronald Johannes van der
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文献类型：
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作者：
M. Koukouli;Marina Zara;C. Lerot;K. Fragkos;D. Balis;M. Roozendael;M. Allart;Ronald Johannes van der
抽象的。本文的主要目的是演示一种对多布森臭氧仪的臭氧总柱进行后处理的方法，以补偿其已知的平流层有效温度依赖性及其对使用多布森臭氧总柱进行卫星臭氧总柱验证的影响。所采用的多布森观测数据是定期提交给世界气象组织的世界臭氧和紫外线数据中心的观测数据，而有效温度是从两个来源提取的：欧洲航天局、欧空局、臭氧气候变化倡议、臭氧-CCI、GODFIT第3版（GOME型直接拟合）算法应用于GOME 2/MetopA，GOME 2A，观测以及来自欧洲中期天气预报中心（ECMWF）的输出。这两个温度源进行评估，利用同位臭氧探空仪测量也从WOUDC数据库检索。GODFIT_v3和ECMWF TEFF被认为是无偏的臭氧探空观测，并同意高的相关系数，特别是高的季节性变化的特点，在TEFF纬度。验证分析表明，当应用GODFIT_v3有效温度对多布森TOC进行后处理时，多布森和GOME 2A GODFIT_v3 TOC之间的平均差异在北方半球从0.63 ± 0.66%变为0.26 ± 0.46%，在南半球从1.25 ± 1.20%变为0.80 ± 0.71%。现有的太阳天顶角的差异依赖性已经被平滑，接近零的依赖性高达60-65°箱和最高的偏差从2.38 ± 6.6%下降到1.37 ± 6.4%的80-85°箱。我们的结论是，全球规模的验证卫星TOC对同位多布森测量的好处后校正使用适当估计的Tefs。
Abstract. The main aim of the paper is to demonstrate an approach for post-processing of the Dobson spectrophotometers' total ozone columns (TOCs) in order to compensate for their known stratospheric effective temperature (Teff) dependency and its resulting effect on the usage of the Dobson TOCs for satellite TOCs' validation. The Dobson observations employed are those routinely submitted to the World Ozone and Ultraviolet Data Centre (WOUDC) of the World Meteorological Organization, whereas the effective temperatures have been extracted from two sources: the European Space Agency, ESA, Ozone Climate Change Initiative, Ozone-CCI, GODFIT version 3 (GOME-type Direct FITting) algorithm applied to the GOME2/MetopA, GOME2A, observations as well as the one derived from the European Centre for Medium-Range Weather Forecasts (ECMWF) outputs. Both temperature sources are evaluated utilizing co-located ozonesonde measurements also retrieved from the WOUDC database. Both GODFIT_v3 and ECMWF Teffs are found to be unbiased against the ozonesonde observations and to agree with high correlation coefficients, especially for latitudes characterized by high seasonal variability in Teff. The validation analysis shows that, when applying the GODFIT_v3 effective temperatures in order to post-process the Dobson TOC, the mean difference between Dobson and GOME2A GODFIT_v3 TOCs moves from 0.63 ± 0.66 to 0.26 ± 0.46 % in the Northern Hemisphere and from 1.25 ± 1.20 to 0.80 ± 0.71 % in the Southern Hemisphere. The existing solar zenith angle dependency of the differences has been smoothed out, with near-zero dependency up to the 60–65° bin and the highest deviation decreasing from 2.38 ± 6.6 to 1.37 ± 6.4 % for the 80–85° bin. We conclude that the global-scale validation of satellite TOCs against collocated Dobson measurements benefits from a post-correction using suitably estimated Teffs.