A method to improve the determination of wave perturbations close to the tropopause by using a digital filter
GPS radio occultation satellite data allowed to analyze in the last decade for the first time a large amount of atmospheric temperature profiles including both the troposphere and the stratosphere all over the globe. Wave amplitude enhancements have been systematically observed around tropopause lev...
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| Formato: | Artículo publishedVersion |
| Lenguaje: | Inglés |
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2011
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_18671381_v4_n9_p1777_Alexander |
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paperaa:paper_18671381_v4_n9_p1777_Alexander2023-06-12T16:51:21Z A method to improve the determination of wave perturbations close to the tropopause by using a digital filter Atmos. Meas. Tech. 2011;4(9):1777-1784 Alexander, P. De La Torre, A. Llamedo, P. Hierro, R. Schmidt, T. Haser, A. Wickert, J. air temperature artifact climatology comparative study COSMIC decadal variation digital mapping filter GPS perturbation refractive index satellite data stratosphere temperature profile troposphere wavelength GPS radio occultation satellite data allowed to analyze in the last decade for the first time a large amount of atmospheric temperature profiles including both the troposphere and the stratosphere all over the globe. Wave amplitude enhancements have been systematically observed around tropopause levels, which are apparently due to artifacts generated by any digital filter used to isolate the wave components from these data. We present a new filtering method which can be equally applied to temperature or refractivity profiles. It was tested with synthetic temperature data based on NCEP reanalyes and observed wave climatologies and it was also statistically validated with GPS radio occultation profiles from the COSMIC mission. The suggested technique significantly reduces artificial enhancements around the tropopause, mainly at low latitudes, where a sharp lapse rate change usually exists. This represents an improvement in comparison to previous applications of standard filters. In addition it would allow the study of longer vertical wavelengths than previously done with other filtering procedures. © Author(s) 2011. Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llamedo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Hierro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_18671381_v4_n9_p1777_Alexander |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| language |
Inglés |
| orig_language_str_mv |
eng |
| topic |
air temperature artifact climatology comparative study COSMIC decadal variation digital mapping filter GPS perturbation refractive index satellite data stratosphere temperature profile troposphere wavelength |
| spellingShingle |
air temperature artifact climatology comparative study COSMIC decadal variation digital mapping filter GPS perturbation refractive index satellite data stratosphere temperature profile troposphere wavelength Alexander, P. De La Torre, A. Llamedo, P. Hierro, R. Schmidt, T. Haser, A. Wickert, J. A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| topic_facet |
air temperature artifact climatology comparative study COSMIC decadal variation digital mapping filter GPS perturbation refractive index satellite data stratosphere temperature profile troposphere wavelength |
| description |
GPS radio occultation satellite data allowed to analyze in the last decade for the first time a large amount of atmospheric temperature profiles including both the troposphere and the stratosphere all over the globe. Wave amplitude enhancements have been systematically observed around tropopause levels, which are apparently due to artifacts generated by any digital filter used to isolate the wave components from these data. We present a new filtering method which can be equally applied to temperature or refractivity profiles. It was tested with synthetic temperature data based on NCEP reanalyes and observed wave climatologies and it was also statistically validated with GPS radio occultation profiles from the COSMIC mission. The suggested technique significantly reduces artificial enhancements around the tropopause, mainly at low latitudes, where a sharp lapse rate change usually exists. This represents an improvement in comparison to previous applications of standard filters. In addition it would allow the study of longer vertical wavelengths than previously done with other filtering procedures. © Author(s) 2011. |
| format |
Artículo Artículo publishedVersion |
| author |
Alexander, P. De La Torre, A. Llamedo, P. Hierro, R. Schmidt, T. Haser, A. Wickert, J. |
| author_facet |
Alexander, P. De La Torre, A. Llamedo, P. Hierro, R. Schmidt, T. Haser, A. Wickert, J. |
| author_sort |
Alexander, P. |
| title |
A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| title_short |
A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| title_full |
A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| title_fullStr |
A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| title_full_unstemmed |
A method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| title_sort |
method to improve the determination of wave perturbations close to the tropopause by using a digital filter |
| publishDate |
2011 |
| url |
http://hdl.handle.net/20.500.12110/paper_18671381_v4_n9_p1777_Alexander |
| work_keys_str_mv |
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