Total ozone trends and variability at three northern high-latitude stations
International audience Even though ozone-depleting substances have been substantially reduced due to the Montreal Protocol, it is still not possible to state with confidence that the total column amount of ozone (total ozone) recovers globally. A special focus lies on high latitudes, as they experie...
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ftuniparissaclay:oai:HAL:insu-03749527v1 2023-11-12T04:01:06+01:00 Total ozone trends and variability at three northern high-latitude stations Bernet, Leonie Svendby, Tove Hansen, Georg Orsolini, Yvan Dahlback, Arne Goutail, Florence Pazmino, Andrea Petkov, Boyan Norwegian Institute for Air Research (NILU) Norwegian University of Science and Technology Trondheim (NTNU) Norwegian University of Science and Technology (NTNU) University of Oslo (UiO) STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Institute of Polar Sciences Venezia-Mestre (CNR-ISP) National Research Council of Italy Online, Unknown Region 2022-05 https://insu.hal.science/insu-03749527 https://doi.org/10.5194/egusphere-egu22-3708 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-3708 insu-03749527 https://insu.hal.science/insu-03749527 doi:10.5194/egusphere-egu22-3708 EGU General Assembly 2022 https://insu.hal.science/insu-03749527 EGU General Assembly 2022, May 2022, Online, Unknown Region. ⟨10.5194/egusphere-egu22-3708⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference papers 2022 ftuniparissaclay https://doi.org/10.5194/egusphere-egu22-3708 2023-10-21T21:29:03Z International audience Even though ozone-depleting substances have been substantially reduced due to the Montreal Protocol, it is still not possible to state with confidence that the total column amount of ozone (total ozone) recovers globally. A special focus lies on high latitudes, as they experienced strong stratospheric ozone depletion in the 1980s and 1990s. Especially at northern high latitudes, it is still challenging to detect significant total ozone trends. It is therefore important to use carefully homogenized and stable long-term ozone measurements and advanced trend models to derive ozone trends at northern high latitudes.This study uses ground-based total ozone measurements in Norway and the Arctic to investigate total ozone trends at northern high latitudes. We present combined total ozone time series from Brewer Spectrophotometers at Oslo (60°N) and Andøya (69°N) in Norway, from 2000 to 2020. In addition, measurements from a SAOZ instrument and a Brewer at Ny-Ålesund in Svalbard are used. The combined Brewer time series consist of direct sun (DS) and global irradiance (GI) Brewer measurements and are complemented with measurements from ground-based ultraviolet radiometers (GUV). This makes it possible to obtain measurements during cloudy conditions and in winter and spring, where DS measurements cannot be retrieved due to large solar zenith angles and reduced direct sunlight.We present total ozone trends at the three measurement stations using the LOTUS (Long-term Ozone Trends and Uncertainties in the Stratosphere) multilinear regression model. We test various explanatory variables and select a set of predictors to obtain the best possible regression fit. We found that besides the commonly used predictors QBO, ENSO, and solar cycle, tropopause pressure and stratospheric temperature are also important to improve the fit. We finally present annual total ozone trends and trends for different months at each station. Despite that the annual trends were generally found to be insignificant, we detected ... Conference Object Andøya Arctic Ny Ålesund Ny-Ålesund Svalbard Archives ouvertes de Paris-Saclay Andøya ENVELOPE(13.982,13.982,68.185,68.185) Arctic Norway Ny-Ålesund Svalbard |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Bernet, Leonie Svendby, Tove Hansen, Georg Orsolini, Yvan Dahlback, Arne Goutail, Florence Pazmino, Andrea Petkov, Boyan Total ozone trends and variability at three northern high-latitude stations |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Even though ozone-depleting substances have been substantially reduced due to the Montreal Protocol, it is still not possible to state with confidence that the total column amount of ozone (total ozone) recovers globally. A special focus lies on high latitudes, as they experienced strong stratospheric ozone depletion in the 1980s and 1990s. Especially at northern high latitudes, it is still challenging to detect significant total ozone trends. It is therefore important to use carefully homogenized and stable long-term ozone measurements and advanced trend models to derive ozone trends at northern high latitudes.This study uses ground-based total ozone measurements in Norway and the Arctic to investigate total ozone trends at northern high latitudes. We present combined total ozone time series from Brewer Spectrophotometers at Oslo (60°N) and Andøya (69°N) in Norway, from 2000 to 2020. In addition, measurements from a SAOZ instrument and a Brewer at Ny-Ålesund in Svalbard are used. The combined Brewer time series consist of direct sun (DS) and global irradiance (GI) Brewer measurements and are complemented with measurements from ground-based ultraviolet radiometers (GUV). This makes it possible to obtain measurements during cloudy conditions and in winter and spring, where DS measurements cannot be retrieved due to large solar zenith angles and reduced direct sunlight.We present total ozone trends at the three measurement stations using the LOTUS (Long-term Ozone Trends and Uncertainties in the Stratosphere) multilinear regression model. We test various explanatory variables and select a set of predictors to obtain the best possible regression fit. We found that besides the commonly used predictors QBO, ENSO, and solar cycle, tropopause pressure and stratospheric temperature are also important to improve the fit. We finally present annual total ozone trends and trends for different months at each station. Despite that the annual trends were generally found to be insignificant, we detected ... |
author2 |
Norwegian Institute for Air Research (NILU) Norwegian University of Science and Technology Trondheim (NTNU) Norwegian University of Science and Technology (NTNU) University of Oslo (UiO) STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Institute of Polar Sciences Venezia-Mestre (CNR-ISP) National Research Council of Italy |
format |
Conference Object |
author |
Bernet, Leonie Svendby, Tove Hansen, Georg Orsolini, Yvan Dahlback, Arne Goutail, Florence Pazmino, Andrea Petkov, Boyan |
author_facet |
Bernet, Leonie Svendby, Tove Hansen, Georg Orsolini, Yvan Dahlback, Arne Goutail, Florence Pazmino, Andrea Petkov, Boyan |
author_sort |
Bernet, Leonie |
title |
Total ozone trends and variability at three northern high-latitude stations |
title_short |
Total ozone trends and variability at three northern high-latitude stations |
title_full |
Total ozone trends and variability at three northern high-latitude stations |
title_fullStr |
Total ozone trends and variability at three northern high-latitude stations |
title_full_unstemmed |
Total ozone trends and variability at three northern high-latitude stations |
title_sort |
total ozone trends and variability at three northern high-latitude stations |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03749527 https://doi.org/10.5194/egusphere-egu22-3708 |
op_coverage |
Online, Unknown Region |
long_lat |
ENVELOPE(13.982,13.982,68.185,68.185) |
geographic |
Andøya Arctic Norway Ny-Ålesund Svalbard |
geographic_facet |
Andøya Arctic Norway Ny-Ålesund Svalbard |
genre |
Andøya Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Andøya Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_source |
EGU General Assembly 2022 https://insu.hal.science/insu-03749527 EGU General Assembly 2022, May 2022, Online, Unknown Region. ⟨10.5194/egusphere-egu22-3708⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-3708 insu-03749527 https://insu.hal.science/insu-03749527 doi:10.5194/egusphere-egu22-3708 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-3708 |
_version_ |
1782329816020680704 |