Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study
This study aims to understand the spatial and temporal variability of HNO3 total columns in terms of explanatory variables. To achieve this, multiple linear regressions are used to fit satellite-derived time series of HNO3 daily averaged total columns. First, an analysis of the IASI 9-year time seri...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/270547 2023-05-15T14:02:22+02:00 Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study Ronsmans, Gaetane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre 2018-04 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/270547 https://dipot.ulb.ac.be/dspace/bitstream/2013/270547/1/doi_254174.pdf en eng uri/info:doi/10.5194/acp-18-4403-2018 uri/info:scp/85044964344 https://dipot.ulb.ac.be/dspace/bitstream/2013/270547/1/doi_254174.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/270547 1 full-text file(s): info:eu-repo/semantics/openAccess Atmospheric chemistry and physics, 18 (7 Phénomènes atmosphériques info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2018 ftunivbruxelles 2022-06-12T22:05:38Z This study aims to understand the spatial and temporal variability of HNO3 total columns in terms of explanatory variables. To achieve this, multiple linear regressions are used to fit satellite-derived time series of HNO3 daily averaged total columns. First, an analysis of the IASI 9-year time series (2008-2016) is conducted based on various equivalent latitude bands. The strong and systematic denitrification of the southern polar stratosphere is observed very clearly. It is also possible to distinguish, within the polar vortex, three regions which are differently affected by the denitrification. Three exceptional denitrification episodes in 2011, 2014 and 2016 are also observed in the Northern Hemisphere, due to unusually low arctic temperatures. The time series are then fitted by multivariate regressions to identify what variables are responsible for HNO3 variability in global distributions and time series, and to quantify their respective influence. Out of an ensemble of proxies (annual cycle, solar flux, quasi-biennial oscillation, multivariate ENSO index, Arctic and Antarctic oscillations and volume of polar stratospheric clouds), only the those defined as significant (p value<0.05) by a selection algorithm are retained for each equivalent latitude band. Overall, the regression gives a good representation of HNO3 variability, with especially good results at high latitudes (60-80% of the observed variability explained by the model). The regressions show the dominance of annual variability in all latitudinal bands, which is related to specific chemistry and dynamics depending on the latitudes. We find that the polar stratospheric clouds (PSCs) also have a major influence in the polar regions, and that their inclusion in the model improves the correlation coefficients and the residuals. However, there is still a relatively large portion of HNO3 variability that remains unexplained by the model, especially in the intertropical regions, where factors not included in the regression model (such as vegetation ... Article in Journal/Newspaper Antarc* Antarctic Arctic DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Arctic |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Phénomènes atmosphériques |
spellingShingle |
Phénomènes atmosphériques Ronsmans, Gaetane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
topic_facet |
Phénomènes atmosphériques |
description |
This study aims to understand the spatial and temporal variability of HNO3 total columns in terms of explanatory variables. To achieve this, multiple linear regressions are used to fit satellite-derived time series of HNO3 daily averaged total columns. First, an analysis of the IASI 9-year time series (2008-2016) is conducted based on various equivalent latitude bands. The strong and systematic denitrification of the southern polar stratosphere is observed very clearly. It is also possible to distinguish, within the polar vortex, three regions which are differently affected by the denitrification. Three exceptional denitrification episodes in 2011, 2014 and 2016 are also observed in the Northern Hemisphere, due to unusually low arctic temperatures. The time series are then fitted by multivariate regressions to identify what variables are responsible for HNO3 variability in global distributions and time series, and to quantify their respective influence. Out of an ensemble of proxies (annual cycle, solar flux, quasi-biennial oscillation, multivariate ENSO index, Arctic and Antarctic oscillations and volume of polar stratospheric clouds), only the those defined as significant (p value<0.05) by a selection algorithm are retained for each equivalent latitude band. Overall, the regression gives a good representation of HNO3 variability, with especially good results at high latitudes (60-80% of the observed variability explained by the model). The regressions show the dominance of annual variability in all latitudinal bands, which is related to specific chemistry and dynamics depending on the latitudes. We find that the polar stratospheric clouds (PSCs) also have a major influence in the polar regions, and that their inclusion in the model improves the correlation coefficients and the residuals. However, there is still a relatively large portion of HNO3 variability that remains unexplained by the model, especially in the intertropical regions, where factors not included in the regression model (such as vegetation ... |
format |
Article in Journal/Newspaper |
author |
Ronsmans, Gaetane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre |
author_facet |
Ronsmans, Gaetane Wespes, Catherine Hurtmans, Daniel Clerbaux, Cathy Coheur, Pierre |
author_sort |
Ronsmans, Gaetane |
title |
Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
title_short |
Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
title_full |
Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
title_fullStr |
Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
title_full_unstemmed |
Spatio-temporal variations of nitric acid total columns from 9 years of IASI measurements-A driver study |
title_sort |
spatio-temporal variations of nitric acid total columns from 9 years of iasi measurements-a driver study |
publishDate |
2018 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/270547 https://dipot.ulb.ac.be/dspace/bitstream/2013/270547/1/doi_254174.pdf |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Atmospheric chemistry and physics, 18 (7 |
op_relation |
uri/info:doi/10.5194/acp-18-4403-2018 uri/info:scp/85044964344 https://dipot.ulb.ac.be/dspace/bitstream/2013/270547/1/doi_254174.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/270547 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766272598700720128 |