Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study
International audience Nitric acid (HNO3) is known to influence the ozone (O3) concentrations in the polar regions, because of its role of reservoir for NOx and of its capacity to form polar stratospheric clouds (PSCs) when temperatures decrease. However, few studies have attempted to address the sp...
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ftuniversailles:oai:HAL:insu-01786034v1 2023-11-05T03:36:43+01:00 Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study Ronsmans, Gaétane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre-François Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique Université libre de Bruxelles (ULB) TROPO - 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) Vienna, Austria 2018-04 https://insu.hal.science/insu-01786034 en eng HAL CCSD insu-01786034 https://insu.hal.science/insu-01786034 Geophysical Research Abstracts EGU General Assembly 2018 https://insu.hal.science/insu-01786034 EGU General Assembly 2018, Apr 2018, Vienna, Austria. pp.EGU2018-17385 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/conferenceObject Conference papers 2018 ftuniversailles 2023-10-10T22:45:09Z International audience Nitric acid (HNO3) is known to influence the ozone (O3) concentrations in the polar regions, because of its role of reservoir for NOx and of its capacity to form polar stratospheric clouds (PSCs) when temperatures decrease. However, few studies have attempted to address the spatio-temporal variations of HNO3 and, in particular, what factors drive this variability.In this presentation, we will briefly review the characteristics of the HNO3 profiles retrieved from IASI, a nadir instrument onboard Metop that provides observations with an unprecedented spatial and temporal sampling. The 9-year HNO3 time series, covering the entire globe, will also be shown and shortly described.The focus of the presentation will be on the results of the first multivariate regression analysis applied to the HNO3 total columns time series. The analysis is based on equivalent latitudes and uses a multivariate regression model to identify what variables are responsible for HNO3 variability and to quantify their respective influence. The variables included in the model are: an annual cycle, the solar flux, the quasi-biennial oscillation, a multivariate ENSO index, the Arctic and Antarctic oscillations and the volume of PSCs. While the results were analysed for all latitudes, focus will be put on the polar regions, where a clear distinction between the inner and outer vortex (in the southern hemisphere) can be confirmed. Also, we show the large influence of the PSCs and the impact of their inclusion (or omission) in the regression model in the southern as well as in the northern polar regions.Finally, preliminary results of a joint study comparing HNO3 and O3 time series in terms of explanatory variables will be shown. The long IASI time series covering the polar regions of both hemispheres during the whole year allow a precise monitoring of the polar processes at play during the winter, and applying multivariate regression to both HNO3 and O3 allows identifying the potentially common trends and influencing ... Conference Object Antarc* Antarctic Arctic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Ronsmans, Gaétane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre-François Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Nitric acid (HNO3) is known to influence the ozone (O3) concentrations in the polar regions, because of its role of reservoir for NOx and of its capacity to form polar stratospheric clouds (PSCs) when temperatures decrease. However, few studies have attempted to address the spatio-temporal variations of HNO3 and, in particular, what factors drive this variability.In this presentation, we will briefly review the characteristics of the HNO3 profiles retrieved from IASI, a nadir instrument onboard Metop that provides observations with an unprecedented spatial and temporal sampling. The 9-year HNO3 time series, covering the entire globe, will also be shown and shortly described.The focus of the presentation will be on the results of the first multivariate regression analysis applied to the HNO3 total columns time series. The analysis is based on equivalent latitudes and uses a multivariate regression model to identify what variables are responsible for HNO3 variability and to quantify their respective influence. The variables included in the model are: an annual cycle, the solar flux, the quasi-biennial oscillation, a multivariate ENSO index, the Arctic and Antarctic oscillations and the volume of PSCs. While the results were analysed for all latitudes, focus will be put on the polar regions, where a clear distinction between the inner and outer vortex (in the southern hemisphere) can be confirmed. Also, we show the large influence of the PSCs and the impact of their inclusion (or omission) in the regression model in the southern as well as in the northern polar regions.Finally, preliminary results of a joint study comparing HNO3 and O3 time series in terms of explanatory variables will be shown. The long IASI time series covering the polar regions of both hemispheres during the whole year allow a precise monitoring of the polar processes at play during the winter, and applying multivariate regression to both HNO3 and O3 allows identifying the potentially common trends and influencing ... |
author2 |
Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique Université libre de Bruxelles (ULB) TROPO - 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) |
format |
Conference Object |
author |
Ronsmans, Gaétane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre-François |
author_facet |
Ronsmans, Gaétane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre-François |
author_sort |
Ronsmans, Gaétane |
title |
Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
title_short |
Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
title_full |
Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
title_fullStr |
Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
title_full_unstemmed |
Spatio-temporal variations of HNO 3 total column from 9 years of IASI measurements - A driver study |
title_sort |
spatio-temporal variations of hno 3 total column from 9 years of iasi measurements - a driver study |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://insu.hal.science/insu-01786034 |
op_coverage |
Vienna, Austria |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Geophysical Research Abstracts EGU General Assembly 2018 https://insu.hal.science/insu-01786034 EGU General Assembly 2018, Apr 2018, Vienna, Austria. pp.EGU2018-17385 |
op_relation |
insu-01786034 https://insu.hal.science/insu-01786034 |
_version_ |
1781691842755035136 |