Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014
Source: doi:10.5194/acp-16-7853-2016 Neutral temperatures at 90 km height above Tromsø, Norway, have been determined using ambipolar diffusion coefficients calculated from meteor echo fading times using the Nippon/Norway Tromsø Meteor Radar (NTMR). Daily temperature averages have been calculated fro...
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ftunivtroemsoe:oai:munin.uit.no:10037/10440 2023-05-15T18:34:27+02:00 Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 Holmen, Silje Eriksen Hall, Chris Tsutsumi, Masaki 2016-06-27 https://hdl.handle.net/10037/10440 https://doi.org/10.5194/acp-16-7853-2016 eng eng European Geosciences Union Atmospheric Chemistry and Physics Holmen, S. E., Hall, C. M., and Tsutsumi, M.: Neutral atmosphere temperature trends and variability at 90 km, 70 °N, 19 °E, 2003–2014, Atmos. Chem. Phys., 16, 7853-7866, doi:10.5194/acp-16-7853-2016, 2016. FRIDAID 1360248 doi:10.5194/acp-16-7853-2016 1680-7316 1680-7324 https://hdl.handle.net/10037/10440 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Journal article Tidsskriftartikkel Peer reviewed 2016 ftunivtroemsoe https://doi.org/10.5194/acp-16-7853-2016 2021-06-25T17:55:06Z Source: doi:10.5194/acp-16-7853-2016 Neutral temperatures at 90 km height above Tromsø, Norway, have been determined using ambipolar diffusion coefficients calculated from meteor echo fading times using the Nippon/Norway Tromsø Meteor Radar (NTMR). Daily temperature averages have been calculated from November 2003 to October 2014 and calibrated against temperature measurements from the Microwave Limb Sounder (MLS) on board Aura. Large-scale periodic oscillations ranging from ∼ 9 days to a year were found in the data using Lomb–Scargle periodogram analysis, and these components were used to seasonally detrend the daily temperature values before assessing trends. Harmonic oscillations found are associated with the large-scale circulation in the middle atmosphere together with planetary and gravity wave activity. The overall temperature change from 2003 to 2014 is −2.2 K ± 1.0 K decade−1, while in summer (May–June–July) and winter (November–December–January) the change is −0.3 K ± 3.1 K decade−1 and −11.6 K ± 4.1 K decade−1, respectively. The temperature record is at this point too short for incorporating a response to solar variability in the trend. How well suited a meteor radar is for estimating neutral temperatures at 90 km using meteor trail echoes is discussed, and physical explanations behind a cooling trend are proposed. Article in Journal/Newspaper Tromsø University of Tromsø: Munin Open Research Archive Norway Tromsø Atmospheric Chemistry and Physics 16 12 7853 7866 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Holmen, Silje Eriksen Hall, Chris Tsutsumi, Masaki Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
description |
Source: doi:10.5194/acp-16-7853-2016 Neutral temperatures at 90 km height above Tromsø, Norway, have been determined using ambipolar diffusion coefficients calculated from meteor echo fading times using the Nippon/Norway Tromsø Meteor Radar (NTMR). Daily temperature averages have been calculated from November 2003 to October 2014 and calibrated against temperature measurements from the Microwave Limb Sounder (MLS) on board Aura. Large-scale periodic oscillations ranging from ∼ 9 days to a year were found in the data using Lomb–Scargle periodogram analysis, and these components were used to seasonally detrend the daily temperature values before assessing trends. Harmonic oscillations found are associated with the large-scale circulation in the middle atmosphere together with planetary and gravity wave activity. The overall temperature change from 2003 to 2014 is −2.2 K ± 1.0 K decade−1, while in summer (May–June–July) and winter (November–December–January) the change is −0.3 K ± 3.1 K decade−1 and −11.6 K ± 4.1 K decade−1, respectively. The temperature record is at this point too short for incorporating a response to solar variability in the trend. How well suited a meteor radar is for estimating neutral temperatures at 90 km using meteor trail echoes is discussed, and physical explanations behind a cooling trend are proposed. |
format |
Article in Journal/Newspaper |
author |
Holmen, Silje Eriksen Hall, Chris Tsutsumi, Masaki |
author_facet |
Holmen, Silje Eriksen Hall, Chris Tsutsumi, Masaki |
author_sort |
Holmen, Silje Eriksen |
title |
Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
title_short |
Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
title_full |
Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
title_fullStr |
Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
title_full_unstemmed |
Neutral atmosphere temperature trends and variability at 90 km, 70°N, 19°E, 2003-2014 |
title_sort |
neutral atmosphere temperature trends and variability at 90 km, 70°n, 19°e, 2003-2014 |
publisher |
European Geosciences Union |
publishDate |
2016 |
url |
https://hdl.handle.net/10037/10440 https://doi.org/10.5194/acp-16-7853-2016 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_relation |
Atmospheric Chemistry and Physics Holmen, S. E., Hall, C. M., and Tsutsumi, M.: Neutral atmosphere temperature trends and variability at 90 km, 70 °N, 19 °E, 2003–2014, Atmos. Chem. Phys., 16, 7853-7866, doi:10.5194/acp-16-7853-2016, 2016. FRIDAID 1360248 doi:10.5194/acp-16-7853-2016 1680-7316 1680-7324 https://hdl.handle.net/10037/10440 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.5194/acp-16-7853-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
12 |
container_start_page |
7853 |
op_container_end_page |
7866 |
_version_ |
1766219195478966272 |