Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

International audience Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high time-resolution measurements, but despite an increasing number of experimental studies, there is still a need for a be...

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Published in:Atmospheric Chemistry and Physics
Main Authors: Delattre, H, Vallet-Coulomb, C, Sonzogni, C
Other Authors: Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2015
Subjects:
Online Access:https://amu.hal.science/hal-01230452
https://amu.hal.science/hal-01230452/document
https://amu.hal.science/hal-01230452/file/acp-15-10167-2015.pdf
https://doi.org/10.5194/acp-15-10167-2015
id ftinsu:oai:HAL:hal-01230452v1
record_format openpolar
spelling ftinsu:oai:HAL:hal-01230452v1 2023-12-17T10:46:34+01:00 Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures Delattre, H Vallet-Coulomb, C Sonzogni, C Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2015 https://amu.hal.science/hal-01230452 https://amu.hal.science/hal-01230452/document https://amu.hal.science/hal-01230452/file/acp-15-10167-2015.pdf https://doi.org/10.5194/acp-15-10167-2015 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-10167-2015 hal-01230452 https://amu.hal.science/hal-01230452 https://amu.hal.science/hal-01230452/document https://amu.hal.science/hal-01230452/file/acp-15-10167-2015.pdf doi:10.5194/acp-15-10167-2015 info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://amu.hal.science/hal-01230452 Atmospheric Chemistry and Physics Discussions, 2015, 15, pp.10167-10181. ⟨10.5194/acp-15-10167-2015⟩ STABLE-ISOTOPE COMPOSITION RATIO MASS-SPECTROMETRY BOUNDARY-LAYER CARBON-DIOXIDE CONTINENTAL MOISTURE SEASONAL-VARIATION AMAZON BASIN IN-SITU PRECIPITATION EVAPOTRANSPIRATION [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.5194/acp-15-10167-2015 2023-11-22T17:51:01Z International audience Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high time-resolution measurements, but despite an increasing number of experimental studies, there is still a need for a better understanding of the isotopic signal variability at different time scales. We present results of in situ measurements of δ 18 O and δD during 36 consecutive days in summer 2011 in atmospheric vapour of a Mediterranean coastal wetland exposed to high evaporation (Camargue, Rhône River delta, France). The mean composition of atmospheric vapour (δ v) is δ 18 O = −14.66 ‰ and δD = −95.4 ‰, with data plotting clearly above the local meteoric water line on a δ 18 O-δD plot, and an average deuterium excess (d) of 21.9 ‰. Important diurnal d variations are observed, and an hourly time scale analysis is necessary to interpret the main processes involved in its variability. After having classified the data according to air mass back trajectories, we analyse the average daily cycles relating to the two main meteorological situations, i.e. air masses originating from North Atlantic Ocean and Mediter-ranean Sea. In both situations, we show that diurnal fluctuations are driven by (1) the influence of local evaporation, culminating during daytime, and leading to an increase in absolute water vapour concentration associated to a δ v enrichment and d increase; (2) vertical air mass redistribution when the Planetary Boundary Layer collapses in the evening, leading to a d decrease, and (3) dew formation during the night, producing a δ v depletion with d remaining stable. Using a two-component mixing model, we calculate the average composition of the locally evaporated vapour (δ E). We find higher d (E) under North Atlantic air mass conditions, which is consistent with lower humidity conditions. We also suggest that δ v measured when the PBL collapses is the most representative of a regional signal. Strong, cold and dry winds ... Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Atmospheric Chemistry and Physics 15 17 10167 10181
institution Open Polar
collection Institut national des sciences de l'Univers: HAL-INSU
op_collection_id ftinsu
language English
topic STABLE-ISOTOPE COMPOSITION
RATIO MASS-SPECTROMETRY
BOUNDARY-LAYER
CARBON-DIOXIDE
CONTINENTAL MOISTURE
SEASONAL-VARIATION
AMAZON BASIN
IN-SITU
PRECIPITATION
EVAPOTRANSPIRATION
[SDE.ES]Environmental Sciences/Environmental and Society
[SDE.MCG]Environmental Sciences/Global Changes
spellingShingle STABLE-ISOTOPE COMPOSITION
RATIO MASS-SPECTROMETRY
BOUNDARY-LAYER
CARBON-DIOXIDE
CONTINENTAL MOISTURE
SEASONAL-VARIATION
AMAZON BASIN
IN-SITU
PRECIPITATION
EVAPOTRANSPIRATION
[SDE.ES]Environmental Sciences/Environmental and Society
[SDE.MCG]Environmental Sciences/Global Changes
Delattre, H
Vallet-Coulomb, C
Sonzogni, C
Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
topic_facet STABLE-ISOTOPE COMPOSITION
RATIO MASS-SPECTROMETRY
BOUNDARY-LAYER
CARBON-DIOXIDE
CONTINENTAL MOISTURE
SEASONAL-VARIATION
AMAZON BASIN
IN-SITU
PRECIPITATION
EVAPOTRANSPIRATION
[SDE.ES]Environmental Sciences/Environmental and Society
[SDE.MCG]Environmental Sciences/Global Changes
description International audience Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high time-resolution measurements, but despite an increasing number of experimental studies, there is still a need for a better understanding of the isotopic signal variability at different time scales. We present results of in situ measurements of δ 18 O and δD during 36 consecutive days in summer 2011 in atmospheric vapour of a Mediterranean coastal wetland exposed to high evaporation (Camargue, Rhône River delta, France). The mean composition of atmospheric vapour (δ v) is δ 18 O = −14.66 ‰ and δD = −95.4 ‰, with data plotting clearly above the local meteoric water line on a δ 18 O-δD plot, and an average deuterium excess (d) of 21.9 ‰. Important diurnal d variations are observed, and an hourly time scale analysis is necessary to interpret the main processes involved in its variability. After having classified the data according to air mass back trajectories, we analyse the average daily cycles relating to the two main meteorological situations, i.e. air masses originating from North Atlantic Ocean and Mediter-ranean Sea. In both situations, we show that diurnal fluctuations are driven by (1) the influence of local evaporation, culminating during daytime, and leading to an increase in absolute water vapour concentration associated to a δ v enrichment and d increase; (2) vertical air mass redistribution when the Planetary Boundary Layer collapses in the evening, leading to a d decrease, and (3) dew formation during the night, producing a δ v depletion with d remaining stable. Using a two-component mixing model, we calculate the average composition of the locally evaporated vapour (δ E). We find higher d (E) under North Atlantic air mass conditions, which is consistent with lower humidity conditions. We also suggest that δ v measured when the PBL collapses is the most representative of a regional signal. Strong, cold and dry winds ...
author2 Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE)
Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
format Article in Journal/Newspaper
author Delattre, H
Vallet-Coulomb, C
Sonzogni, C
author_facet Delattre, H
Vallet-Coulomb, C
Sonzogni, C
author_sort Delattre, H
title Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
title_short Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
title_full Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
title_fullStr Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
title_full_unstemmed Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures
title_sort deuterium excess in the atmospheric water vapour of a mediterranean coastal wetland: regional vs. local signatures
publisher HAL CCSD
publishDate 2015
url https://amu.hal.science/hal-01230452
https://amu.hal.science/hal-01230452/document
https://amu.hal.science/hal-01230452/file/acp-15-10167-2015.pdf
https://doi.org/10.5194/acp-15-10167-2015
genre North Atlantic
genre_facet North Atlantic
op_source ISSN: 1680-7367
EISSN: 1680-7375
Atmospheric Chemistry and Physics Discussions
https://amu.hal.science/hal-01230452
Atmospheric Chemistry and Physics Discussions, 2015, 15, pp.10167-10181. ⟨10.5194/acp-15-10167-2015⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-15-10167-2015
hal-01230452
https://amu.hal.science/hal-01230452
https://amu.hal.science/hal-01230452/document
https://amu.hal.science/hal-01230452/file/acp-15-10167-2015.pdf
doi:10.5194/acp-15-10167-2015
op_rights info:eu-repo/semantics/OpenAccess
op_doi https://doi.org/10.5194/acp-15-10167-2015
container_title Atmospheric Chemistry and Physics
container_volume 15
container_issue 17
container_start_page 10167
op_container_end_page 10181
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