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DOI	10.1016/j.atmosres.2020.104870
	The effect of considering polar vortex dynamics in the validation of satellite total ozone observations
	Paschou P.; Koukouli M.-E.; Balis D.; Lerot C.; Van Roozendael M.
发表日期	2020
ISSN	0169-8095
卷号	238
英文摘要	The main aim of this paper is to demonstrate the magnitude in which validation results of space-based total ozone column, TOC, measurements are affected by the location of the polar vortex. Potential Vorticity is used as an indicator to determine the polar vortex's boundary and surface area, provided by ERA-Interim reanalysis datasets from the European Centre for Medium-Range Weather Forecasts (ECMWF). The total ozone measurements that were examined fall within the hemispherical winter-spring period, focusing on middle and high latitudes on both hemispheres. The space-based total ozone data produced by the GODFIT (GOME-type Direct FITting) v4 algorithm as applied to the OMI/Aura, GOME-2/Metop-A and Metop-B observations, part of the European Space Agency's Ozone Climate Change Initiative project, are compared to TOC measurements from Brewer and Dobson spectrophotometers archived at the World Ozone and Ultraviolet Radiation Data Centre (WOUDC) repository. The satellite-to-ground collocations were classified depending on whether both satellite and ground-based measurements are inside or outside the polar vortex (matched) or one measurement is inside whereas the other one is outside the polar vortex (mismatched). It is shown that the matched cases present an improved agreement between satellite and ground TOC measurements compared to the mismatched cases. Considering all examined stations for GOME2-A, GOME2-B, and OMI, the mean bias for the mismatched cases was found to be 2.22 ± 0.4%, 1.84 ± 0.57%, and 1.93 ± 0.39% respectively, while for the matched cases was found to be 1.46 ± 0.17%, 1.69 ± 0.22%, 1.7 ± 0.19% respectively. For the three satellite sensors, the mismatched cases do not exceed 3.3% of the total available collocations per station during the winter-spring period between years 2007 and 2017, where applicable. Hence, on a global scale, the exclusion of mismatched collocated measurements does not cause significant changes and the resulting impact on the validation of the satellite TOCs is small. However, when considering single stations consistently affected by the polar vortex, we conclude that mismatched cases should be excluded from the comparisons. © 2020 Elsevier B.V.
英文关键词	GOME2; OMI; Potential vorticity; Total ozone column; Validation
学科领域	Climate change; Ozone; Small satellites; Vortex flow; Vorticity; Weather forecasting; Dobson spectrophotometer; European centre for medium-range weather forecasts; GOME2; Ground based measurement; Potential vorticity; Total ozone column; Total ozone measurements; Validation; Ultraviolet spectrometers; electromagnetic field; GOME; polar vortex; potential vorticity; satellite data; total ozone; Europe
语种	英语
scopus关键词	Climate change; Ozone; Small satellites; Vortex flow; Vorticity; Weather forecasting; Dobson spectrophotometer; European centre for medium-range weather forecasts; GOME2; Ground based measurement; Potential vorticity; Total ozone column; Total ozone measurements; Validation; Ultraviolet spectrometers; electromagnetic field; GOME; polar vortex; potential vorticity; satellite data; total ozone; Europe
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120432
作者单位	Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece; Royal Belgian Institute for Space Aeronomy, 3, Avenue Circulaire, Brussels, 1180, Belgium
推荐引用方式 GB/T 7714	Paschou P.,Koukouli M.-E.,Balis D.,et al. The effect of considering polar vortex dynamics in the validation of satellite total ozone observations[J],2020,238.
APA	Paschou P.,Koukouli M.-E.,Balis D.,Lerot C.,&Van Roozendael M..(2020).The effect of considering polar vortex dynamics in the validation of satellite total ozone observations.Atmospheric Research,238.
MLA	Paschou P.,et al."The effect of considering polar vortex dynamics in the validation of satellite total ozone observations".Atmospheric Research 238(2020).