Objective quantification of perturbations produced with a piecewise PV inversion technique
PV inversion techniques have been widely used in numerical studies of severe weather cases. These techniques can be applied as a way to study the sensitivity of the responsible meteorological system to changes in the initial conditions of the simulations. Dynamical effects of a collection of atmosph...
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00031910 2023-05-15T17:31:31+02:00 Objective quantification of perturbations produced with a piecewise PV inversion technique Fita, L. Romero, R. Ramis, C. 2007-11 electronic https://doi.org/10.5194/angeo-25-2335-2007 https://noa.gwlb.de/receive/cop_mods_00031910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031864/angeo-25-2335-2007.pdf https://angeo.copernicus.org/articles/25/2335/2007/angeo-25-2335-2007.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-25-2335-2007 https://noa.gwlb.de/receive/cop_mods_00031910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031864/angeo-25-2335-2007.pdf https://angeo.copernicus.org/articles/25/2335/2007/angeo-25-2335-2007.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2007 ftnonlinearchiv https://doi.org/10.5194/angeo-25-2335-2007 2022-02-08T22:46:29Z PV inversion techniques have been widely used in numerical studies of severe weather cases. These techniques can be applied as a way to study the sensitivity of the responsible meteorological system to changes in the initial conditions of the simulations. Dynamical effects of a collection of atmospheric features involved in the evolution of the system can be isolated. However, aspects, such as the definition of the atmospheric features or the amount of change in the initial conditions, are largely case-dependent and/or subjectively defined. An objective way to calculate the modification of the initial fields is proposed to alleviate this problem. The perturbations are quantified as the mean absolute variations of the total energy between the original and modified fields, and an unique energy variation value is fixed for all the perturbations derived from different PV anomalies. Thus, PV features of different dimensions and characteristics introduce the same net modification of the initial conditions from an energetic point of view. The devised quantification method is applied to study the high impact weather case of 9–11 November 2001 in the Western Mediterranean basin, when a deep and strong cyclone was formed. On the Balearic Islands 4 people died, and sustained winds of 30 ms−1 and precipitation higher than 200 mm/24 h were recorded. Moreover, 700 people died in Algiers during the first phase of the event. The sensitivities to perturbations in the initial conditions of a deep upper level trough, the anticyclonic system related to the North Atlantic high and the surface thermal anomaly related to the baroclinicity of the environment are determined. Results reveal a high influence of the upper level trough and the surface thermal anomaly and a minor role of the North Atlantic high during the genesis of the cyclone. Article in Journal/Newspaper North Atlantic Niedersächsisches Online-Archiv NOA Annales Geophysicae 25 11 2335 2349 |
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article Verlagsveröffentlichung Fita, L. Romero, R. Ramis, C. Objective quantification of perturbations produced with a piecewise PV inversion technique |
topic_facet |
article Verlagsveröffentlichung |
description |
PV inversion techniques have been widely used in numerical studies of severe weather cases. These techniques can be applied as a way to study the sensitivity of the responsible meteorological system to changes in the initial conditions of the simulations. Dynamical effects of a collection of atmospheric features involved in the evolution of the system can be isolated. However, aspects, such as the definition of the atmospheric features or the amount of change in the initial conditions, are largely case-dependent and/or subjectively defined. An objective way to calculate the modification of the initial fields is proposed to alleviate this problem. The perturbations are quantified as the mean absolute variations of the total energy between the original and modified fields, and an unique energy variation value is fixed for all the perturbations derived from different PV anomalies. Thus, PV features of different dimensions and characteristics introduce the same net modification of the initial conditions from an energetic point of view. The devised quantification method is applied to study the high impact weather case of 9–11 November 2001 in the Western Mediterranean basin, when a deep and strong cyclone was formed. On the Balearic Islands 4 people died, and sustained winds of 30 ms−1 and precipitation higher than 200 mm/24 h were recorded. Moreover, 700 people died in Algiers during the first phase of the event. The sensitivities to perturbations in the initial conditions of a deep upper level trough, the anticyclonic system related to the North Atlantic high and the surface thermal anomaly related to the baroclinicity of the environment are determined. Results reveal a high influence of the upper level trough and the surface thermal anomaly and a minor role of the North Atlantic high during the genesis of the cyclone. |
format |
Article in Journal/Newspaper |
author |
Fita, L. Romero, R. Ramis, C. |
author_facet |
Fita, L. Romero, R. Ramis, C. |
author_sort |
Fita, L. |
title |
Objective quantification of perturbations produced with a piecewise PV inversion technique |
title_short |
Objective quantification of perturbations produced with a piecewise PV inversion technique |
title_full |
Objective quantification of perturbations produced with a piecewise PV inversion technique |
title_fullStr |
Objective quantification of perturbations produced with a piecewise PV inversion technique |
title_full_unstemmed |
Objective quantification of perturbations produced with a piecewise PV inversion technique |
title_sort |
objective quantification of perturbations produced with a piecewise pv inversion technique |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doi.org/10.5194/angeo-25-2335-2007 https://noa.gwlb.de/receive/cop_mods_00031910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031864/angeo-25-2335-2007.pdf https://angeo.copernicus.org/articles/25/2335/2007/angeo-25-2335-2007.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-25-2335-2007 https://noa.gwlb.de/receive/cop_mods_00031910 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031864/angeo-25-2335-2007.pdf https://angeo.copernicus.org/articles/25/2335/2007/angeo-25-2335-2007.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-25-2335-2007 |
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Annales Geophysicae |
container_volume |
25 |
container_issue |
11 |
container_start_page |
2335 |
op_container_end_page |
2349 |
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