Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle
Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed maximum surface pressure response in the North Atlantic occurs 2–4 years after sol...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2771691 2023-05-15T17:28:34+02:00 Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle Guttu, Sigmund Orsolini, Yvan Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine Tartaglione, Nazario Verronen, Pekka T. Rodger, Craig J. Clilverd, Mark A. 2021 application/pdf https://hdl.handle.net/11250/2771691 https://doi.org/10.3390/atmos12081029 eng eng MDPI NILU - Norsk institutt for luftforskning: 116104 Norges forskningsråd: 255276 Atmosphere. 2021, 12 (8), 1-21. urn:issn:2073-4433 https://hdl.handle.net/11250/2771691 https://doi.org/10.3390/atmos12081029 cristin:1929009 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 1-21 12 Atmosphere 8 Peer reviewed Journal article 2021 ftntnutrondheimi https://doi.org/10.3390/atmos12081029 2021-09-01T22:35:18Z Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed maximum surface pressure response in the North Atlantic occurs 2–4 years after solar maximum, and some model studies have identified that atmosphere–ocean feedbacks explain the multi-year lag. Alternatively, medium-to-high energy electron (MEE) precipitation, which peaks in the declining phase of the solar cycle, has been suggested as a potential cause of this lag. We use a coupled (ocean–atmosphere) climate prediction model and a state-of-the-art MEE forcing to explore the respective roles of irradiance and MEE precipitation on the NAO variability. Three decadal ensemble experiments were conducted over solar cycle 23 in an idealized setting. We found a weak ensemble-mean positive NAO response to the irradiance. The simulated signal-to-noise ratio remained very small, indicating the predominance of internal NAO variability. The lack of multi-annual lag in the NAO response was likely due to lagged solar signals imprinted in temperatures below the oceanic mixed-layer re-emerging equatorward of the oceanic frontal zones, which anchor ocean–atmosphere feedbacks. While there is a clear, yet weak, signature from UV irradiance in the atmosphere and upper ocean over the North Atlantic, enhanced MEE precipitation on the other hand does not lead to any systematic changes in the stratospheric circulation, despite its marked chemical signatures. publishedVersion This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited Article in Journal/Newspaper North Atlantic North Atlantic oscillation NTNU Open Archive (Norwegian University of Science and Technology) Atmosphere 12 8 1029 |
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Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed maximum surface pressure response in the North Atlantic occurs 2–4 years after solar maximum, and some model studies have identified that atmosphere–ocean feedbacks explain the multi-year lag. Alternatively, medium-to-high energy electron (MEE) precipitation, which peaks in the declining phase of the solar cycle, has been suggested as a potential cause of this lag. We use a coupled (ocean–atmosphere) climate prediction model and a state-of-the-art MEE forcing to explore the respective roles of irradiance and MEE precipitation on the NAO variability. Three decadal ensemble experiments were conducted over solar cycle 23 in an idealized setting. We found a weak ensemble-mean positive NAO response to the irradiance. The simulated signal-to-noise ratio remained very small, indicating the predominance of internal NAO variability. The lack of multi-annual lag in the NAO response was likely due to lagged solar signals imprinted in temperatures below the oceanic mixed-layer re-emerging equatorward of the oceanic frontal zones, which anchor ocean–atmosphere feedbacks. While there is a clear, yet weak, signature from UV irradiance in the atmosphere and upper ocean over the North Atlantic, enhanced MEE precipitation on the other hand does not lead to any systematic changes in the stratospheric circulation, despite its marked chemical signatures. publishedVersion This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited |
format |
Article in Journal/Newspaper |
author |
Guttu, Sigmund Orsolini, Yvan Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine Tartaglione, Nazario Verronen, Pekka T. Rodger, Craig J. Clilverd, Mark A. |
spellingShingle |
Guttu, Sigmund Orsolini, Yvan Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine Tartaglione, Nazario Verronen, Pekka T. Rodger, Craig J. Clilverd, Mark A. Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
author_facet |
Guttu, Sigmund Orsolini, Yvan Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine Tartaglione, Nazario Verronen, Pekka T. Rodger, Craig J. Clilverd, Mark A. |
author_sort |
Guttu, Sigmund |
title |
Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
title_short |
Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
title_full |
Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
title_fullStr |
Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
title_full_unstemmed |
Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle |
title_sort |
impacts of uv irradiance and medium-energy electron precipitation on the north atlantic oscillation during the 11-year solar cycle |
publisher |
MDPI |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2771691 https://doi.org/10.3390/atmos12081029 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
1-21 12 Atmosphere 8 |
op_relation |
NILU - Norsk institutt for luftforskning: 116104 Norges forskningsråd: 255276 Atmosphere. 2021, 12 (8), 1-21. urn:issn:2073-4433 https://hdl.handle.net/11250/2771691 https://doi.org/10.3390/atmos12081029 cristin:1929009 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/atmos12081029 |
container_title |
Atmosphere |
container_volume |
12 |
container_issue |
8 |
container_start_page |
1029 |
_version_ |
1766121327927754752 |