Neutral atmosphere temperature trends and variability at 90 km, 70 °N, 19 °E, 2003–2014
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 c...
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ftdoajarticles:oai:doaj.org/article:36b7448dffdd496bbc4a9ea8c16c1c1e 2023-05-15T18:34:23+02:00 Neutral atmosphere temperature trends and variability at 90 km, 70 °N, 19 °E, 2003–2014 S. E. Holmen C. M. Hall M. Tsutsumi 2016-06-01T00:00:00Z https://doi.org/10.5194/acp-16-7853-2016 https://doaj.org/article/36b7448dffdd496bbc4a9ea8c16c1c1e EN eng Copernicus Publications https://www.atmos-chem-phys.net/16/7853/2016/acp-16-7853-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-7853-2016 1680-7316 1680-7324 https://doaj.org/article/36b7448dffdd496bbc4a9ea8c16c1c1e Atmospheric Chemistry and Physics, Vol 16, Pp 7853-7866 (2016) Physics QC1-999 Chemistry QD1-999 article 2016 ftdoajarticles https://doi.org/10.5194/acp-16-7853-2016 2022-12-31T13:16:59Z 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 Directory of Open Access Journals: DOAJ Articles Norway Tromsø Atmospheric Chemistry and Physics 16 12 7853 7866 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 S. E. Holmen C. M. Hall M. Tsutsumi Neutral atmosphere temperature trends and variability at 90 km, 70 °N, 19 °E, 2003–2014 |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
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 |
S. E. Holmen C. M. Hall M. Tsutsumi |
author_facet |
S. E. Holmen C. M. Hall M. Tsutsumi |
author_sort |
S. E. Holmen |
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 |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-16-7853-2016 https://doaj.org/article/36b7448dffdd496bbc4a9ea8c16c1c1e |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
Atmospheric Chemistry and Physics, Vol 16, Pp 7853-7866 (2016) |
op_relation |
https://www.atmos-chem-phys.net/16/7853/2016/acp-16-7853-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-7853-2016 1680-7316 1680-7324 https://doaj.org/article/36b7448dffdd496bbc4a9ea8c16c1c1e |
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 |
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1766219106336374784 |