Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate
The unique and distinctive 17O-excess (Δ17O) of ozone (O3) serves as a valuable tracer for oxidative processes in both modern and ancient atmospheres. This isotopic signature is propagated throughout the atmospheric reactive nitrogen (NOx = NO + NO2) cycle and preserved in nitrate (NO3-) aerosols an...
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fttriple:oai:gotriple.eu:10670/1.tpo1c5 2023-05-15T14:00:48+02:00 Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate Transfert de l'anomalie isotopique portée par l'ozone dans la troposphère : vers une interprétation quantitative de la composition isotopique en oxygène du nitrate atmosphérique Vicars, William Grenoble Savarino, Joël 2013-04-19 http://www.theses.fr/2013GRENU037/document fr fre 10670/1.tpo1c5 http://www.theses.fr/2013GRENU037/document other Theses.fr Anomalies isotopiques Climat Chimie atmosphérique Régions polaires Oxygène Azote Ozone Nitrate atmosphérique Isotope anomalies Climate Atmospheric chemistry Polar regions Oxygen Nitrogen Atmospheric nitrate geo envir Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2013 fttriple 2023-01-22T18:32:12Z The unique and distinctive 17O-excess (Δ17O) of ozone (O3) serves as a valuable tracer for oxidative processes in both modern and ancient atmospheres. This isotopic signature is propagated throughout the atmospheric reactive nitrogen (NOx = NO + NO2) cycle and preserved in nitrate (NO3-) aerosols and mineral deposits, providing a conservative tracer for the relative importance of ozone and other key oxidants involved in NOx cycling. However, despite the intense research effort dedicated to the interpretation of Δ17O(NO3-) measurements, the atmospheric processes responsible for the transfer of Δ17O to nitrate and their overall influence on nitrate isotopic composition on different spatial and temporal scales are not well understood. Furthermore, due to the inherent complexity of extracting ozone from ambient air, the absolute magnitude and spatiotemporal variability of Δ17O(O3) remains poorly constrained, a problem that has confounded the interpretation of Δ17O measurements for over a decade. The research questions that have been pursued in this thesis were formulated to address these knowledge gaps. The primary analytical tool used was the bacterial denitrifier method followed by continuous-flow isotope ratio mass spectrometry (CF-IRMS), which allows for the comprehensive isotopic analysis of nitrate (i.e., δ15N, δ18O, Δ17O). This method was applied to the isotopic analysis of nitrate samples in two case studies: (i) an investigation of the diurnal and spatial features of atmospheric nitrate isotopic composition in coastal California; and (ii) a study of the seasonality and air-snow transfer of nitrate stable isotopes on the Antarctic plateau. Furthermore, the method was adapted to the isotopic characterization of ozone via chemical conversion of its terminal oxygen atoms to nitrate. During the course of this thesis, a large dataset of tropospheric Δ17O(O3) measurements has been obtained, including a full annual record from Grenoble, France (45 °N) and a ship-based latitudinal profile from 50 °S to 50 °N in the ... Thesis Antarc* Antarctic Unknown Antarctic The Antarctic |
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Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
French |
topic |
Anomalies isotopiques Climat Chimie atmosphérique Régions polaires Oxygène Azote Ozone Nitrate atmosphérique Isotope anomalies Climate Atmospheric chemistry Polar regions Oxygen Nitrogen Atmospheric nitrate geo envir |
spellingShingle |
Anomalies isotopiques Climat Chimie atmosphérique Régions polaires Oxygène Azote Ozone Nitrate atmosphérique Isotope anomalies Climate Atmospheric chemistry Polar regions Oxygen Nitrogen Atmospheric nitrate geo envir Vicars, William Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
topic_facet |
Anomalies isotopiques Climat Chimie atmosphérique Régions polaires Oxygène Azote Ozone Nitrate atmosphérique Isotope anomalies Climate Atmospheric chemistry Polar regions Oxygen Nitrogen Atmospheric nitrate geo envir |
description |
The unique and distinctive 17O-excess (Δ17O) of ozone (O3) serves as a valuable tracer for oxidative processes in both modern and ancient atmospheres. This isotopic signature is propagated throughout the atmospheric reactive nitrogen (NOx = NO + NO2) cycle and preserved in nitrate (NO3-) aerosols and mineral deposits, providing a conservative tracer for the relative importance of ozone and other key oxidants involved in NOx cycling. However, despite the intense research effort dedicated to the interpretation of Δ17O(NO3-) measurements, the atmospheric processes responsible for the transfer of Δ17O to nitrate and their overall influence on nitrate isotopic composition on different spatial and temporal scales are not well understood. Furthermore, due to the inherent complexity of extracting ozone from ambient air, the absolute magnitude and spatiotemporal variability of Δ17O(O3) remains poorly constrained, a problem that has confounded the interpretation of Δ17O measurements for over a decade. The research questions that have been pursued in this thesis were formulated to address these knowledge gaps. The primary analytical tool used was the bacterial denitrifier method followed by continuous-flow isotope ratio mass spectrometry (CF-IRMS), which allows for the comprehensive isotopic analysis of nitrate (i.e., δ15N, δ18O, Δ17O). This method was applied to the isotopic analysis of nitrate samples in two case studies: (i) an investigation of the diurnal and spatial features of atmospheric nitrate isotopic composition in coastal California; and (ii) a study of the seasonality and air-snow transfer of nitrate stable isotopes on the Antarctic plateau. Furthermore, the method was adapted to the isotopic characterization of ozone via chemical conversion of its terminal oxygen atoms to nitrate. During the course of this thesis, a large dataset of tropospheric Δ17O(O3) measurements has been obtained, including a full annual record from Grenoble, France (45 °N) and a ship-based latitudinal profile from 50 °S to 50 °N in the ... |
author2 |
Grenoble Savarino, Joël |
format |
Thesis |
author |
Vicars, William |
author_facet |
Vicars, William |
author_sort |
Vicars, William |
title |
Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
title_short |
Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
title_full |
Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
title_fullStr |
Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
title_full_unstemmed |
Constraining the propagation of the 17O-excess of ozone in the troposphere : Towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
title_sort |
constraining the propagation of the 17o-excess of ozone in the troposphere : towards a quantitative interpretation of the oxygen isotopic composition of atmospheric nitrate |
publishDate |
2013 |
url |
http://www.theses.fr/2013GRENU037/document |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Theses.fr |
op_relation |
10670/1.tpo1c5 http://www.theses.fr/2013GRENU037/document |
op_rights |
other |
_version_ |
1766270138025246720 |