Objective quantification of perturbations produced with a piecewise PV inversion technique
International audience 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...
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ftccsdartic:oai:HAL:hal-00318407v1 2023-11-12T04:22:08+01:00 Objective quantification of perturbations produced with a piecewise PV inversion technique Fita, L. Romero, R. Ramis, C. Grup de Meteorologia Departament de Fisica 2007-11-29 https://hal.science/hal-00318407 https://hal.science/hal-00318407/document https://hal.science/hal-00318407/file/angeo-25-2335-2007.pdf en eng HAL CCSD European Geosciences Union hal-00318407 https://hal.science/hal-00318407 https://hal.science/hal-00318407/document https://hal.science/hal-00318407/file/angeo-25-2335-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318407 Annales Geophysicae, 2007, 25 (11), pp.2335-2349 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:06:31Z International audience 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fita, L. Romero, R. Ramis, C. Objective quantification of perturbations produced with a piecewise PV inversion technique |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Grup de Meteorologia Departament de Fisica |
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 |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00318407 https://hal.science/hal-00318407/document https://hal.science/hal-00318407/file/angeo-25-2335-2007.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318407 Annales Geophysicae, 2007, 25 (11), pp.2335-2349 |
op_relation |
hal-00318407 https://hal.science/hal-00318407 https://hal.science/hal-00318407/document https://hal.science/hal-00318407/file/angeo-25-2335-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782337280108658688 |