The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation
The stratospheric, tropospheric and surface impacts from the 11 year ultraviolet solar spectral irradiance (SSI) variability have been extensively studied using climate models and observations. Here, we demonstrate using idealized model simulations that the Pacific Decadal Oscillation (PDO), which h...
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ftoslouniv:oai:www.duo.uio.no:10852/86248 2023-05-15T13:15:06+02:00 The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine 2021-05-25T13:35:31Z http://hdl.handle.net/10852/86248 http://urn.nb.no/URN:NBN:no-88900 https://doi.org/10.1088/1748-9326/abfe8b EN eng NOTUR/NORSTORE/NN9206K NFR/255276 NILU/116104 http://urn.nb.no/URN:NBN:no-88900 Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine . The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation. Environmental Research Letters. 2021, 16 http://hdl.handle.net/10852/86248 1911715 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Environmental Research Letters&rft.volume=16&rft.spage=&rft.date=2021 Environmental Research Letters 16 6 10 https://doi.org/10.1088/1748-9326/abfe8b URN:NBN:no-88900 Fulltext https://www.duo.uio.no/bitstream/handle/10852/86248/1/Guttu%2Bet%2Bal_Environ%2BRes%2BLett_2021.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 1748-9326 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2021 ftoslouniv https://doi.org/10.1088/1748-9326/abfe8b 2021-06-02T22:30:59Z The stratospheric, tropospheric and surface impacts from the 11 year ultraviolet solar spectral irradiance (SSI) variability have been extensively studied using climate models and observations. Here, we demonstrate using idealized model simulations that the Pacific Decadal Oscillation (PDO), which has been shown to impact the tropospheric and stratospheric circulation from sub-decadal to multi-decadal timescales, strongly modulates the solar-induced atmospheric response. To this end, we use a high-top version of the coupled ocean–atmosphere Norwegian Climate Prediction Model forced by the SSI dataset recommended for Coupled Model Intercomparison Project 6. We perform a 24-member ensemble experiment over the solar cycle 23 in an idealized framework. To assess the PDO modulation of the solar signal, we divide the model data into the two PDO phases, PDO+ and PDO−, for each solar (maximum or minimum) phase. By compositing and combining the four categories, we hence determine the component of the solar signal that is independent of the PDO and the modulation of the solar signal by the PDO, along with the solar signal in each PDO phase. Reciprocally, we determine the PDO effect in each solar phase. Our results show that the intensification of the polar vortex under solar maximum is much stronger in the PDO− phase. This signal is transferred into the troposphere, where we find a correspondingly stronger polar jet and weaker Aleutian Low. We further show that the amplification of the solar signal by the PDO− phase is driven by anomalous meridional advection of solar-induced temperature anomalies over northern North America and the North Pacific, which contributes to a decreased meridional eddy heat flux and hence to a decreased vertical planetary wave flux into the stratosphere. Article in Journal/Newspaper aleutian low Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Pacific Environmental Research Letters 16 6 064030 |
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Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The stratospheric, tropospheric and surface impacts from the 11 year ultraviolet solar spectral irradiance (SSI) variability have been extensively studied using climate models and observations. Here, we demonstrate using idealized model simulations that the Pacific Decadal Oscillation (PDO), which has been shown to impact the tropospheric and stratospheric circulation from sub-decadal to multi-decadal timescales, strongly modulates the solar-induced atmospheric response. To this end, we use a high-top version of the coupled ocean–atmosphere Norwegian Climate Prediction Model forced by the SSI dataset recommended for Coupled Model Intercomparison Project 6. We perform a 24-member ensemble experiment over the solar cycle 23 in an idealized framework. To assess the PDO modulation of the solar signal, we divide the model data into the two PDO phases, PDO+ and PDO−, for each solar (maximum or minimum) phase. By compositing and combining the four categories, we hence determine the component of the solar signal that is independent of the PDO and the modulation of the solar signal by the PDO, along with the solar signal in each PDO phase. Reciprocally, we determine the PDO effect in each solar phase. Our results show that the intensification of the polar vortex under solar maximum is much stronger in the PDO− phase. This signal is transferred into the troposphere, where we find a correspondingly stronger polar jet and weaker Aleutian Low. We further show that the amplification of the solar signal by the PDO− phase is driven by anomalous meridional advection of solar-induced temperature anomalies over northern North America and the North Pacific, which contributes to a decreased meridional eddy heat flux and hence to a decreased vertical planetary wave flux into the stratosphere. |
format |
Article in Journal/Newspaper |
author |
Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine |
spellingShingle |
Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
author_facet |
Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine |
author_sort |
Guttu, Sigmund |
title |
The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
title_short |
The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
title_full |
The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
title_fullStr |
The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
title_full_unstemmed |
The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation |
title_sort |
11 year solar cycle uv irradiance effect and its dependency on the pacific decadal oscillation |
publishDate |
2021 |
url |
http://hdl.handle.net/10852/86248 http://urn.nb.no/URN:NBN:no-88900 https://doi.org/10.1088/1748-9326/abfe8b |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_source |
1748-9326 |
op_relation |
NOTUR/NORSTORE/NN9206K NFR/255276 NILU/116104 http://urn.nb.no/URN:NBN:no-88900 Guttu, Sigmund Orsolini, Yvan J. Stordal, Frode Otterå, Odd Helge Omrani, Nour-Eddine . The 11 year solar cycle UV irradiance effect and its dependency on the Pacific Decadal Oscillation. Environmental Research Letters. 2021, 16 http://hdl.handle.net/10852/86248 1911715 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Environmental Research Letters&rft.volume=16&rft.spage=&rft.date=2021 Environmental Research Letters 16 6 10 https://doi.org/10.1088/1748-9326/abfe8b URN:NBN:no-88900 Fulltext https://www.duo.uio.no/bitstream/handle/10852/86248/1/Guttu%2Bet%2Bal_Environ%2BRes%2BLett_2021.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1088/1748-9326/abfe8b |
container_title |
Environmental Research Letters |
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16 |
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6 |
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064030 |
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1766266916523999232 |