Comparison of GOME total ozone data with ground data from the Spanish Brewer spectroradiometers
| Autor: | Pieter Valks, Diego Loyola, Beatris Navascúes, Manuel Antón |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Atmospheric Science
Ozone Atmospheric chemistry Correlation coefficient Meteorology Cloud cover Solar zenith angle Atmospheric sciences Middle atmosphere chemistry.chemical_compound Atmospheric composition and structure (Middle atmosphere – composition and chemistry Earth and Planetary Sciences (miscellaneous) Instruments and techniques) lcsh:Science Atmospheric composition lcsh:QC801-809 Geology Astronomy and Astrophysics Atmospheric temperature lcsh:QC1-999 lcsh:Geophysics. Cosmic physics Spectroradiometer chemistry Space and Planetary Science Environmental science Satellite lcsh:Q Instruments lcsh:Physics |
| Zdroj: | Annales Geophysicae, Vol 26, Pp 401-412 (2008) ARCIMIS. Archivo Climatológico y Meteorológico Institucional (AEMET) Agencia Estatal de Meteorología (AEMET) Scopus-Elsevier Annales Geophysicae, Vol 26, Iss 3, Pp 401-412 (2008) |
| ISSN: | 1432-0576 0992-7689 |
| Popis: | This paper compares total ozone measurements from five Brewer spectroradiometers located at the Iberian Peninsula with satellite observations given by the GOME (Global Ozone Monitoring Experiment) sensor. The analyzed period covers simultaneous ozone values from July 1995 until December 2004. The regression analysis shows an excellent agreement between Brewer-GOME values in the five locations; the coefficient of correlation is always higher than 0.92 and the root mean square error is about 3%. Moreover, the comparison shows that the satellite retrieval accuracy is within the uncertainty of current ground-based instruments. In addition, the effects of several variables, such as cloudiness, solar zenith angle (SZA), effective temperature and total ozone values in Brewer-GOME differences are analyzed. The results indicate that clouds induce a minor dependence of GOME values on the SZA. For example, during heavy cloudy conditions in Madrid station, GOME observations overestimate ground-based Brewer data for low AMF (low SZA values) by 2% while for high AMF (high SZA values) the satellite underestimates ground-based ozone values by 1%. Moreover, the dependence of Brewer-GOME differences with respect to SZA for cloud-free conditions may be due to the variability of effective temperature. This fact could indicate that the effective temperature estimated by GOME does not fully reflect the actual atmospheric temperature variability. Finally, GOME ozone observations slightly underestimate the highest values measured by the Brewer spectrophotometers and overestimates the lowest ground-based measurements. This work has been partially supported by INM with a postgraduate grant (project #16-2005/2006) and the visiting scientist program of EUMETSAT satellite application facility for ozone and atmospheric chemistry monitoring (O3M-SAF). |
| Databáze: | OpenAIRE |
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