Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies
International audience The climatological behaviour of the thermospheric meridional wind above Kiruna, Sweden (67.4°N, 20.4°E) has been investigated for seasonal and solar cycle dependence using six different techniques, comprising both model and experimental sources. Model output from both the empi...
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ftinsu:oai:HAL:hal-00317266v1 2023-11-12T04:16:38+01:00 Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies Griffin, E. M. Aruliah, A. Müller-Wodarg, I. C. F. Aylward, A. Atmospheric Physics Laboratory UCL London University College of London London (UCL) 2004-03-19 https://hal.science/hal-00317266 https://hal.science/hal-00317266/document https://hal.science/hal-00317266/file/angeo-22-863-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317266 https://hal.science/hal-00317266 https://hal.science/hal-00317266/document https://hal.science/hal-00317266/file/angeo-22-863-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317266 Annales Geophysicae, 2004, 22 (3), pp.863-876 [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 2004 ftinsu 2023-10-25T16:25:19Z International audience The climatological behaviour of the thermospheric meridional wind above Kiruna, Sweden (67.4°N, 20.4°E) has been investigated for seasonal and solar cycle dependence using six different techniques, comprising both model and experimental sources. Model output from both the empirical Horizontal Wind Model (HWM) (Hedin et al., 1988) and the numerical Coupled Thermosphere and Ionosphere Model (CTIM) are compared to the measured behaviour at Kiruna, as a single site example. The empirical International Reference Ionosphere (IRI) model is used as input to an implementation of servo theory, to provide another climatology combining empirical input with a theoretical framework. The experimental techniques have been introduced in a companion paper in this issue and provide climatologies from direct measurements, using Fabry-Perot Interferometers (FPI), together with 2 separate techniques applied to the European Incoherent Scatter radar (EISCAT) database to derive neutral winds. One of these techniques uses the same implementation of servo theory as has been used with the IRI model. Detailed comparisons for each season and solar activity category allow for conclusions to be drawn as to the major influences on the climatological behaviour of the wind at this latitude. Comparison of the incoherent scatter radar (ISR) derived neutral winds with FPI, empirical model and numerical model winds is important to our understanding and judgement of the validity of the techniques used to derive thermospheric wind databases. The comparisons also test model performance and indicate possible reasons for differences found between the models. In turn, the conclusions point to possible improvements in their formulation. In particular it is found that the empirical models are over-reliant on mid-latitude data in their formulation, and fail to provide accurate estimates of the winds at high-latitudes. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics), Ionosphere (ionosphere-atmosphere ... Article in Journal/Newspaper EISCAT Kiruna Institut national des sciences de l'Univers: HAL-INSU Kiruna |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 Griffin, E. M. Aruliah, A. Müller-Wodarg, I. C. F. Aylward, A. Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The climatological behaviour of the thermospheric meridional wind above Kiruna, Sweden (67.4°N, 20.4°E) has been investigated for seasonal and solar cycle dependence using six different techniques, comprising both model and experimental sources. Model output from both the empirical Horizontal Wind Model (HWM) (Hedin et al., 1988) and the numerical Coupled Thermosphere and Ionosphere Model (CTIM) are compared to the measured behaviour at Kiruna, as a single site example. The empirical International Reference Ionosphere (IRI) model is used as input to an implementation of servo theory, to provide another climatology combining empirical input with a theoretical framework. The experimental techniques have been introduced in a companion paper in this issue and provide climatologies from direct measurements, using Fabry-Perot Interferometers (FPI), together with 2 separate techniques applied to the European Incoherent Scatter radar (EISCAT) database to derive neutral winds. One of these techniques uses the same implementation of servo theory as has been used with the IRI model. Detailed comparisons for each season and solar activity category allow for conclusions to be drawn as to the major influences on the climatological behaviour of the wind at this latitude. Comparison of the incoherent scatter radar (ISR) derived neutral winds with FPI, empirical model and numerical model winds is important to our understanding and judgement of the validity of the techniques used to derive thermospheric wind databases. The comparisons also test model performance and indicate possible reasons for differences found between the models. In turn, the conclusions point to possible improvements in their formulation. In particular it is found that the empirical models are over-reliant on mid-latitude data in their formulation, and fail to provide accurate estimates of the winds at high-latitudes. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics), Ionosphere (ionosphere-atmosphere ... |
author2 |
Atmospheric Physics Laboratory UCL London University College of London London (UCL) |
format |
Article in Journal/Newspaper |
author |
Griffin, E. M. Aruliah, A. Müller-Wodarg, I. C. F. Aylward, A. |
author_facet |
Griffin, E. M. Aruliah, A. Müller-Wodarg, I. C. F. Aylward, A. |
author_sort |
Griffin, E. M. |
title |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
title_short |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
title_full |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
title_fullStr |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
title_full_unstemmed |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
title_sort |
comparison of high-latitude thermospheric meridionalwinds ii: combined fpi, radar and model climatologies |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00317266 https://hal.science/hal-00317266/document https://hal.science/hal-00317266/file/angeo-22-863-2004.pdf |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
EISCAT Kiruna |
genre_facet |
EISCAT Kiruna |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317266 Annales Geophysicae, 2004, 22 (3), pp.863-876 |
op_relation |
hal-00317266 https://hal.science/hal-00317266 https://hal.science/hal-00317266/document https://hal.science/hal-00317266/file/angeo-22-863-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333715540606976 |