Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica

In this study, the first fully-continuous monitoring of water vapour isotopic composition at Neumayer Station III, Antarctica, during the two-year period from February 2017 to January 2019 is presented. Seasonal and synoptic-scale variations of both stable water isotopes H 2 18 O and HDO are reporte...

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Main Authors: Bagheri Dastgerdi, Saeid, Behrens, Melanie, Bonne, Jean-Louis, Hörhold, Maria, Lohmann, Gerrit, Schlosser, Elisabeth, Werner, Martin
Format: Text
Language:English
Published: 2020
Subjects:
Online Access:https://doi.org/10.5194/tc-2020-302
https://tc.copernicus.org/preprints/tc-2020-302/
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spelling ftcopernicus:oai:publications.copernicus.org:tcd90317 2023-05-15T13:31:39+02:00 Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica Bagheri Dastgerdi, Saeid Behrens, Melanie Bonne, Jean-Louis Hörhold, Maria Lohmann, Gerrit Schlosser, Elisabeth Werner, Martin 2020-10-27 application/pdf https://doi.org/10.5194/tc-2020-302 https://tc.copernicus.org/preprints/tc-2020-302/ eng eng doi:10.5194/tc-2020-302 https://tc.copernicus.org/preprints/tc-2020-302/ eISSN: 1994-0424 Text 2020 ftcopernicus https://doi.org/10.5194/tc-2020-302 2020-11-02T17:22:14Z In this study, the first fully-continuous monitoring of water vapour isotopic composition at Neumayer Station III, Antarctica, during the two-year period from February 2017 to January 2019 is presented. Seasonal and synoptic-scale variations of both stable water isotopes H 2 18 O and HDO are reported, and their link to variations of key meteorological variables are analysed. Changes in local temperature and humidity are the main drivers for the variability of δ O 18 and δ D in vapour at Neumayer Station III, both on seasonal and shorter time scales. In contrast to the measured δ O 18 and δ D variations, no seasonal cycle in the Deuterium excess signal d–excess in vapour is detected. However, a rather high uncertainty of measured d–excess values especially in austral winter limits the confidence of this finding. Overall, the d–excess signal shows a stronger inverse correlation with humidity than with temperature, and this inverse correlation between d–excess and humidity is stronger for the cloudy-sky conditions than for clear-sky conditions during summertime. Back trajectory simulations performed with the FLEXPART model show that seasonal and synoptic variations of δ O 18 and δ D in vapour coincide with changes in the main sources of water vapour transported to Neumayer Station. In general, moisture transport pathways from the east lead to higher temperatures and more enriched δ O 18 values in vapour, while weather situations with southerly winds lead to lower temperatures and more depleted δ O 18 values. However, for several occasions, δ O 18 variations linked to wind direction changes were observed, which were not accompanied by a corresponding temperature change. Comparing isotopic compositions of water vapour at Neumayer Station III and snow samples taken in the vicinity of the station reveals almost identical slopes, both for the δ O 18 –δ D relation and for the temperature–δ O 18 relation. Text Antarc* Antarctica East Antarctica Copernicus Publications: E-Journals Austral East Antarctica Neumayer Neumayer Station
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description In this study, the first fully-continuous monitoring of water vapour isotopic composition at Neumayer Station III, Antarctica, during the two-year period from February 2017 to January 2019 is presented. Seasonal and synoptic-scale variations of both stable water isotopes H 2 18 O and HDO are reported, and their link to variations of key meteorological variables are analysed. Changes in local temperature and humidity are the main drivers for the variability of δ O 18 and δ D in vapour at Neumayer Station III, both on seasonal and shorter time scales. In contrast to the measured δ O 18 and δ D variations, no seasonal cycle in the Deuterium excess signal d–excess in vapour is detected. However, a rather high uncertainty of measured d–excess values especially in austral winter limits the confidence of this finding. Overall, the d–excess signal shows a stronger inverse correlation with humidity than with temperature, and this inverse correlation between d–excess and humidity is stronger for the cloudy-sky conditions than for clear-sky conditions during summertime. Back trajectory simulations performed with the FLEXPART model show that seasonal and synoptic variations of δ O 18 and δ D in vapour coincide with changes in the main sources of water vapour transported to Neumayer Station. In general, moisture transport pathways from the east lead to higher temperatures and more enriched δ O 18 values in vapour, while weather situations with southerly winds lead to lower temperatures and more depleted δ O 18 values. However, for several occasions, δ O 18 variations linked to wind direction changes were observed, which were not accompanied by a corresponding temperature change. Comparing isotopic compositions of water vapour at Neumayer Station III and snow samples taken in the vicinity of the station reveals almost identical slopes, both for the δ O 18 –δ D relation and for the temperature–δ O 18 relation.
format Text
author Bagheri Dastgerdi, Saeid
Behrens, Melanie
Bonne, Jean-Louis
Hörhold, Maria
Lohmann, Gerrit
Schlosser, Elisabeth
Werner, Martin
spellingShingle Bagheri Dastgerdi, Saeid
Behrens, Melanie
Bonne, Jean-Louis
Hörhold, Maria
Lohmann, Gerrit
Schlosser, Elisabeth
Werner, Martin
Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
author_facet Bagheri Dastgerdi, Saeid
Behrens, Melanie
Bonne, Jean-Louis
Hörhold, Maria
Lohmann, Gerrit
Schlosser, Elisabeth
Werner, Martin
author_sort Bagheri Dastgerdi, Saeid
title Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
title_short Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
title_full Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
title_fullStr Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
title_full_unstemmed Continuous monitoring of surface water vapour isotopic compositions at Neumayer Station III, East Antarctica
title_sort continuous monitoring of surface water vapour isotopic compositions at neumayer station iii, east antarctica
publishDate 2020
url https://doi.org/10.5194/tc-2020-302
https://tc.copernicus.org/preprints/tc-2020-302/
geographic Austral
East Antarctica
Neumayer
Neumayer Station
geographic_facet Austral
East Antarctica
Neumayer
Neumayer Station
genre Antarc*
Antarctica
East Antarctica
genre_facet Antarc*
Antarctica
East Antarctica
op_source eISSN: 1994-0424
op_relation doi:10.5194/tc-2020-302
https://tc.copernicus.org/preprints/tc-2020-302/
op_doi https://doi.org/10.5194/tc-2020-302
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