The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland
Since September 2011, a wavelength-scanned cavity ring-down spectroscopy analyser has been remotely operated in Ivittuut, southern Greenland, providing the first record of surface water vapour isotopic composition based on continuous measurements in South Greenland and the first record including the...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/84963 2023-05-15T16:25:30+02:00 The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland Bonne, Jean-Louis Masson-Delmotte, Valérie Cattani, O. Delmotte, M. Risi, Camille Sodemann, Harald Steen-Larsen, Hans C. 2014 application/application/pdf https://hdl.handle.net/20.500.11850/84963 https://doi.org/10.3929/ethz-b-000084963 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-14-4419-2014 info:eu-repo/semantics/altIdentifier/wos/000336739700005 http://hdl.handle.net/20.500.11850/84963 doi:10.3929/ethz-b-000084963 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported CC-BY Atmospheric Chemistry and Physics, 14 (9) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftethz https://doi.org/20.500.11850/84963 https://doi.org/10.3929/ethz-b-000084963 https://doi.org/10.5194/acp-14-4419-2014 2023-02-13T00:45:24Z Since September 2011, a wavelength-scanned cavity ring-down spectroscopy analyser has been remotely operated in Ivittuut, southern Greenland, providing the first record of surface water vapour isotopic composition based on continuous measurements in South Greenland and the first record including the winter season in Greenland. The comparison of vapour data with measurements of precipitation isotopic composition suggest an equilibrium between surface vapour and precipitation. δ18O and deuterium excess are generally anti-correlated and show important seasonal variations, with respective amplitudes of ~10 and ~20‰, as well as large synoptic variations. The data depict small summer diurnal variations. At the seasonal scale, δ18O has a minimum in November–December and a maximum in June–July, while deuterium excess has a minimum in May–June and a maximum in November. The approach of low-pressure systems towards South Greenland leads to δ18O increase (typically +5‰) and deuterium excess decrease (typically −15‰). Seasonal and synoptic variations coincide with shifts in the moisture sources, estimated using a quantitative moisture source diagnostic based on a Lagrangian back-trajectory model. The atmospheric general circulation model LMDZiso correctly captures the seasonal and synoptic variability of δ18O, but does not capture the observed magnitude of deuterium excess variability. Covariations of water vapour isotopic composition with local and moisture source meteorological parameters have been evaluated. δ18O is strongly correlated with the logarithm of local surface humidity, consistent with Rayleigh distillation processes, and with local surface air temperature, associated with a slope of ~0.4‰ °C−1. Deuterium excess correlates with local surface relative humidity as well as surface relative humidity from the dominant moisture source area located in the North Atlantic, south of Greenland and Iceland. ISSN:1680-7375 ISSN:1680-7367 Article in Journal/Newspaper Greenland Iceland Ivittuut North Atlantic ETH Zürich Research Collection Greenland |
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Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
Since September 2011, a wavelength-scanned cavity ring-down spectroscopy analyser has been remotely operated in Ivittuut, southern Greenland, providing the first record of surface water vapour isotopic composition based on continuous measurements in South Greenland and the first record including the winter season in Greenland. The comparison of vapour data with measurements of precipitation isotopic composition suggest an equilibrium between surface vapour and precipitation. δ18O and deuterium excess are generally anti-correlated and show important seasonal variations, with respective amplitudes of ~10 and ~20‰, as well as large synoptic variations. The data depict small summer diurnal variations. At the seasonal scale, δ18O has a minimum in November–December and a maximum in June–July, while deuterium excess has a minimum in May–June and a maximum in November. The approach of low-pressure systems towards South Greenland leads to δ18O increase (typically +5‰) and deuterium excess decrease (typically −15‰). Seasonal and synoptic variations coincide with shifts in the moisture sources, estimated using a quantitative moisture source diagnostic based on a Lagrangian back-trajectory model. The atmospheric general circulation model LMDZiso correctly captures the seasonal and synoptic variability of δ18O, but does not capture the observed magnitude of deuterium excess variability. Covariations of water vapour isotopic composition with local and moisture source meteorological parameters have been evaluated. δ18O is strongly correlated with the logarithm of local surface humidity, consistent with Rayleigh distillation processes, and with local surface air temperature, associated with a slope of ~0.4‰ °C−1. Deuterium excess correlates with local surface relative humidity as well as surface relative humidity from the dominant moisture source area located in the North Atlantic, south of Greenland and Iceland. ISSN:1680-7375 ISSN:1680-7367 |
format |
Article in Journal/Newspaper |
author |
Bonne, Jean-Louis Masson-Delmotte, Valérie Cattani, O. Delmotte, M. Risi, Camille Sodemann, Harald Steen-Larsen, Hans C. |
spellingShingle |
Bonne, Jean-Louis Masson-Delmotte, Valérie Cattani, O. Delmotte, M. Risi, Camille Sodemann, Harald Steen-Larsen, Hans C. The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
author_facet |
Bonne, Jean-Louis Masson-Delmotte, Valérie Cattani, O. Delmotte, M. Risi, Camille Sodemann, Harald Steen-Larsen, Hans C. |
author_sort |
Bonne, Jean-Louis |
title |
The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
title_short |
The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
title_full |
The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
title_fullStr |
The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
title_full_unstemmed |
The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland |
title_sort |
isotopic composition of water vapour and precipitation in ivittuut, southern greenland |
publisher |
Copernicus |
publishDate |
2014 |
url |
https://hdl.handle.net/20.500.11850/84963 https://doi.org/10.3929/ethz-b-000084963 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland Ivittuut North Atlantic |
genre_facet |
Greenland Iceland Ivittuut North Atlantic |
op_source |
Atmospheric Chemistry and Physics, 14 (9) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-14-4419-2014 info:eu-repo/semantics/altIdentifier/wos/000336739700005 http://hdl.handle.net/20.500.11850/84963 doi:10.3929/ethz-b-000084963 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/84963 https://doi.org/10.3929/ethz-b-000084963 https://doi.org/10.5194/acp-14-4419-2014 |
_version_ |
1766014278970638336 |