Origin of unprecedented ozone loss in the Arctic in 2011
An unprecedented stratospheric ozone loss has been reported in the Arctic from all ground-based, sondes and satellites observations during the winter 2010-11. It was attributed to unusually long-lasting cold conditions allowing Polar Stratospheric Clouds to form until at least mid-March. Chlorine ac...
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ftsorbonneuniv:oai:HAL:hal-00732513v1 2024-09-15T17:43:45+00:00 Origin of unprecedented ozone loss in the Arctic in 2011 Goutail, Florence Pommereau, Jean-Pierre Lefèvre, Franck Pazmino, Andrea STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Toronto, Canada 2012-08-27 https://hal.science/hal-00732513 en eng HAL CCSD hal-00732513 https://hal.science/hal-00732513 Quadrennial Ozone Symposium https://hal.science/hal-00732513 Quadrennial Ozone Symposium, Aug 2012, Toronto, Canada [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference papers 2012 ftsorbonneuniv 2024-07-25T23:47:32Z An unprecedented stratospheric ozone loss has been reported in the Arctic from all ground-based, sondes and satellites observations during the winter 2010-11. It was attributed to unusually long-lasting cold conditions allowing Polar Stratospheric Clouds to form until at least mid-March. Chlorine activation and ozone loss amplitudes are found comparable to that in the Antarctic ozone hole, but the warmer conditions, the lesser reduction of nitric acid, and the absence of dehydration, indicate that Arctic ozone holes are possible even with temperature much milder than those in the Antarctic (Manney et al., 2011, Arnone et al, 2011). Here the ozone loss in and out vortex is evaluated by the "passive" method by comparison between total ozone measured at height SAOZ stations and that simulated by the REPROBUS Chemistry Transport Model (CTM) ignoring chemistry. Most unprecedented feature is the loss rate of 0.5-0.6% per day after February 20, similar to that observed in the Antarctic but never seen before in the Arctic. The explanation, demonstrated by the simultaneous NO2 SAOZ measurements, is the late renoxification of the vortex after the photolysis of HNO3 starting on March 20 only, later than all other years in the Arctic, particularly in 1997, the year of the longer lasting cold vortex. This implies strong denoxification (heterogeneous conversion of N2O5 in HNO3) and at least partial denitrification by sedimentation of NAT particles, that is temperature far below that of NAT formation in the early winter as reported. In summary, it is shown that the unprecedented loss amplitude in the winter 2011 was due to a cold vortex until mid-March, but also to extremely cold temperatures below TICE, in the mid stratosphere in January. Shown in the presentation will be the evolution of the ozone loss and the NO2 column in and out vortex during the 2010-2011winter, the contribution of gas phase chemistry, the relationship with sunlit VPSC, and comparisons with previous years, particularly those of largest losses. Conference Object Antarc* Antarctic HAL Sorbonne Université |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
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] Goutail, Florence Pommereau, Jean-Pierre Lefèvre, Franck Pazmino, Andrea Origin of unprecedented ozone loss in the Arctic in 2011 |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
An unprecedented stratospheric ozone loss has been reported in the Arctic from all ground-based, sondes and satellites observations during the winter 2010-11. It was attributed to unusually long-lasting cold conditions allowing Polar Stratospheric Clouds to form until at least mid-March. Chlorine activation and ozone loss amplitudes are found comparable to that in the Antarctic ozone hole, but the warmer conditions, the lesser reduction of nitric acid, and the absence of dehydration, indicate that Arctic ozone holes are possible even with temperature much milder than those in the Antarctic (Manney et al., 2011, Arnone et al, 2011). Here the ozone loss in and out vortex is evaluated by the "passive" method by comparison between total ozone measured at height SAOZ stations and that simulated by the REPROBUS Chemistry Transport Model (CTM) ignoring chemistry. Most unprecedented feature is the loss rate of 0.5-0.6% per day after February 20, similar to that observed in the Antarctic but never seen before in the Arctic. The explanation, demonstrated by the simultaneous NO2 SAOZ measurements, is the late renoxification of the vortex after the photolysis of HNO3 starting on March 20 only, later than all other years in the Arctic, particularly in 1997, the year of the longer lasting cold vortex. This implies strong denoxification (heterogeneous conversion of N2O5 in HNO3) and at least partial denitrification by sedimentation of NAT particles, that is temperature far below that of NAT formation in the early winter as reported. In summary, it is shown that the unprecedented loss amplitude in the winter 2011 was due to a cold vortex until mid-March, but also to extremely cold temperatures below TICE, in the mid stratosphere in January. Shown in the presentation will be the evolution of the ozone loss and the NO2 column in and out vortex during the 2010-2011winter, the contribution of gas phase chemistry, the relationship with sunlit VPSC, and comparisons with previous years, particularly those of largest losses. |
author2 |
STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Goutail, Florence Pommereau, Jean-Pierre Lefèvre, Franck Pazmino, Andrea |
author_facet |
Goutail, Florence Pommereau, Jean-Pierre Lefèvre, Franck Pazmino, Andrea |
author_sort |
Goutail, Florence |
title |
Origin of unprecedented ozone loss in the Arctic in 2011 |
title_short |
Origin of unprecedented ozone loss in the Arctic in 2011 |
title_full |
Origin of unprecedented ozone loss in the Arctic in 2011 |
title_fullStr |
Origin of unprecedented ozone loss in the Arctic in 2011 |
title_full_unstemmed |
Origin of unprecedented ozone loss in the Arctic in 2011 |
title_sort |
origin of unprecedented ozone loss in the arctic in 2011 |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00732513 |
op_coverage |
Toronto, Canada |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Quadrennial Ozone Symposium https://hal.science/hal-00732513 Quadrennial Ozone Symposium, Aug 2012, Toronto, Canada |
op_relation |
hal-00732513 https://hal.science/hal-00732513 |
_version_ |
1810490898634506240 |