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...
Main Authors: | , , , , , , |
---|---|
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/ |
id |
ftcopernicus:oai:publications.copernicus.org:tcd90317 |
---|---|
record_format |
openpolar |
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 |
_version_ |
1766019794122833920 |