Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations
The Weddell Sea Anomaly (WSA) is a recurrent feature of the austral summer midlatitude ionosphere where electron densities are observed to maximize during the local nighttime. In this study, tidal decomposition is applied to FORMOSAT-3 (Formosa Satellite)/Constellation Observing System for Meteorolo...
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ftchengkunguniv:oai:ir.lib.ncku.edu.tw:987654321/166650 2023-05-15T18:43:18+02:00 Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations Chang, Loren C. Liu, Huixin Miyoshi, Yasunobu Chen, Chia-Hung Chang, Fu-Yuan Lin, Chien-Hung Liu, Jann-Yenq Sun, Yan-Yi Department of Earth sciences 2015-02 102 bytes text/html https://doi.org/10.1002/2014JA020752 http://ir.lib.ncku.edu.tw/handle/987654321/166650 http://ir.lib.ncku.edu.tw/bitstream/987654321/166650/1/index.html Eng eng JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol. 120, No. 2, pp. 1325-1340 ionosphere wedded sea anomaly MSNA tides COSMIC GAIA Article 2015 ftchengkunguniv https://doi.org/10.1002/2014JA020752 2016-12-16T01:00:40Z The Weddell Sea Anomaly (WSA) is a recurrent feature of the austral summer midlatitude ionosphere where electron densities are observed to maximize during the local nighttime. In this study, tidal decomposition is applied to FORMOSAT-3 (Formosa Satellite)/Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) total electron content (TEC) and electron density observations between 2007 and 2012 to quantify the components dominating local time and spatial variation in the WSA region. Our results present some of the first three-dimensional spaceborne analyses of the WSA from a tidal perspective over multiple years. We find that the features of the WSA can be reconstructed as the result of superposition between the dominant diurnal standing (D0), eastward wave number 1 (DE1), westward wave number 2 (DW2), and stationary planetary wave 1 (SPW1) components in TECs, producing the characteristic midnight WSA peak. The D0, DE1, DW2, and SPW1 components are found to be an interannually recurring feature of the southern midlatitude to high-latitude ionosphere during the summer, manifesting as enhancements in electron density around 300km altitude of the summer middle to high magnetic latitudes. The phases of the aforementioned nonmigrating diurnal signatures in electron density in this region are near evanescent, suggesting in situ generation, rather than upward propagation from below. However, the SPW1 signature shows some signs of an eastward tilt with altitude, suggesting possible downward propagation. The relation of these components to possible generation via in situ photoionization or plasma transport along magnetic field lines is also discussed using results from the Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy (GAIA) general circulation model (GCM), connecting the tidal interpretation of the WSA to previously examined generation mechanisms. Article in Journal/Newspaper Weddell Sea National Cheng Kung University: NCKU Institutional Repository Austral Weddell Weddell Sea Journal of Geophysical Research: Space Physics 120 2 1325 1340 |
institution |
Open Polar |
collection |
National Cheng Kung University: NCKU Institutional Repository |
op_collection_id |
ftchengkunguniv |
language |
English |
topic |
ionosphere wedded sea anomaly MSNA tides COSMIC GAIA |
spellingShingle |
ionosphere wedded sea anomaly MSNA tides COSMIC GAIA Chang, Loren C. Liu, Huixin Miyoshi, Yasunobu Chen, Chia-Hung Chang, Fu-Yuan Lin, Chien-Hung Liu, Jann-Yenq Sun, Yan-Yi Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
topic_facet |
ionosphere wedded sea anomaly MSNA tides COSMIC GAIA |
description |
The Weddell Sea Anomaly (WSA) is a recurrent feature of the austral summer midlatitude ionosphere where electron densities are observed to maximize during the local nighttime. In this study, tidal decomposition is applied to FORMOSAT-3 (Formosa Satellite)/Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) total electron content (TEC) and electron density observations between 2007 and 2012 to quantify the components dominating local time and spatial variation in the WSA region. Our results present some of the first three-dimensional spaceborne analyses of the WSA from a tidal perspective over multiple years. We find that the features of the WSA can be reconstructed as the result of superposition between the dominant diurnal standing (D0), eastward wave number 1 (DE1), westward wave number 2 (DW2), and stationary planetary wave 1 (SPW1) components in TECs, producing the characteristic midnight WSA peak. The D0, DE1, DW2, and SPW1 components are found to be an interannually recurring feature of the southern midlatitude to high-latitude ionosphere during the summer, manifesting as enhancements in electron density around 300km altitude of the summer middle to high magnetic latitudes. The phases of the aforementioned nonmigrating diurnal signatures in electron density in this region are near evanescent, suggesting in situ generation, rather than upward propagation from below. However, the SPW1 signature shows some signs of an eastward tilt with altitude, suggesting possible downward propagation. The relation of these components to possible generation via in situ photoionization or plasma transport along magnetic field lines is also discussed using results from the Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy (GAIA) general circulation model (GCM), connecting the tidal interpretation of the WSA to previously examined generation mechanisms. |
author2 |
Department of Earth sciences |
format |
Article in Journal/Newspaper |
author |
Chang, Loren C. Liu, Huixin Miyoshi, Yasunobu Chen, Chia-Hung Chang, Fu-Yuan Lin, Chien-Hung Liu, Jann-Yenq Sun, Yan-Yi |
author_facet |
Chang, Loren C. Liu, Huixin Miyoshi, Yasunobu Chen, Chia-Hung Chang, Fu-Yuan Lin, Chien-Hung Liu, Jann-Yenq Sun, Yan-Yi |
author_sort |
Chang, Loren C. |
title |
Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
title_short |
Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
title_full |
Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
title_fullStr |
Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
title_full_unstemmed |
Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT-3/COSMIC observations and GAIA GCM simulations |
title_sort |
structure and origins of the weddell sea anomaly from tidal and planetary wave signatures in formosat-3/cosmic observations and gaia gcm simulations |
publishDate |
2015 |
url |
https://doi.org/10.1002/2014JA020752 http://ir.lib.ncku.edu.tw/handle/987654321/166650 http://ir.lib.ncku.edu.tw/bitstream/987654321/166650/1/index.html |
geographic |
Austral Weddell Weddell Sea |
geographic_facet |
Austral Weddell Weddell Sea |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol. 120, No. 2, pp. 1325-1340 |
op_doi |
https://doi.org/10.1002/2014JA020752 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
120 |
container_issue |
2 |
container_start_page |
1325 |
op_container_end_page |
1340 |
_version_ |
1766233607998799872 |