Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica
Water stable isotopes (δ 18 O and δD) in Antarctic snow pits and ice cores are extensively applied in paleoclimate reconstruction. However, their interpretation varies over some climate change processes that can alter isotope signals after deposition, especially at sites with a low snow accumulation...
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ftdoajarticles:oai:doaj.org/article:1ffc63e5084643d2a41a7cd867c9beb8 2023-05-15T13:57:29+02:00 Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica Tianming Ma Li Li Guitao Shi Yuansheng Li 2020-06-01T00:00:00Z https://doi.org/10.3390/w12061707 https://doaj.org/article/1ffc63e5084643d2a41a7cd867c9beb8 EN eng MDPI AG https://www.mdpi.com/2073-4441/12/6/1707 https://doaj.org/toc/2073-4441 doi:10.3390/w12061707 2073-4441 https://doaj.org/article/1ffc63e5084643d2a41a7cd867c9beb8 Water, Vol 12, Iss 1707, p 1707 (2020) water stable isotopes post-depositional process sublimation–condensation cycle diffusion surface snow Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 article 2020 ftdoajarticles https://doi.org/10.3390/w12061707 2022-12-31T01:09:58Z Water stable isotopes (δ 18 O and δD) in Antarctic snow pits and ice cores are extensively applied in paleoclimate reconstruction. However, their interpretation varies over some climate change processes that can alter isotope signals after deposition, especially at sites with a low snow accumulation rate (<30 mm w.e. year −1 ). To investigate post-depositional effects during the archival processes of snow isotopes, we first analyzed δ 18 O and δD variations in summer precipitation, surface snow and snow pit samples collected at Dome A. Then, the effects of individual post-depositional processes were evaluated from the results of field experiments, spectral analysis and modeling simulations. It was found that the sublimation–condensation cycle and isotopic diffusion were likely the dominant processes that modified the δ 18 O at and under the snow–air interface, respectively. The sublimation–condensation cycle can cause no significant isotopic modification of δ 18 O from field experiments with ~3 cm snow. The diffusion process can significantly erase the original seasonal variation of δ 18 O driven by atmospheric temperature, leading to an apparent cycle of ~20 cm average wavelength present in the δ 18 O profile. Through the comparison with the artificial isotopic profile, the noise input from the diffusion process was the dominant component in the δ 18 O signal. Although some other processes (such as drifting, ventilation and metamorphism) were not fully considered, the quantitative understanding for the sublimation–condensation and diffusion processes will contribute to the paleoclimate construction using the ice core water isotope records at Dome A. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Water 12 6 1707 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
water stable isotopes post-depositional process sublimation–condensation cycle diffusion surface snow Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
spellingShingle |
water stable isotopes post-depositional process sublimation–condensation cycle diffusion surface snow Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Tianming Ma Li Li Guitao Shi Yuansheng Li Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
topic_facet |
water stable isotopes post-depositional process sublimation–condensation cycle diffusion surface snow Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
description |
Water stable isotopes (δ 18 O and δD) in Antarctic snow pits and ice cores are extensively applied in paleoclimate reconstruction. However, their interpretation varies over some climate change processes that can alter isotope signals after deposition, especially at sites with a low snow accumulation rate (<30 mm w.e. year −1 ). To investigate post-depositional effects during the archival processes of snow isotopes, we first analyzed δ 18 O and δD variations in summer precipitation, surface snow and snow pit samples collected at Dome A. Then, the effects of individual post-depositional processes were evaluated from the results of field experiments, spectral analysis and modeling simulations. It was found that the sublimation–condensation cycle and isotopic diffusion were likely the dominant processes that modified the δ 18 O at and under the snow–air interface, respectively. The sublimation–condensation cycle can cause no significant isotopic modification of δ 18 O from field experiments with ~3 cm snow. The diffusion process can significantly erase the original seasonal variation of δ 18 O driven by atmospheric temperature, leading to an apparent cycle of ~20 cm average wavelength present in the δ 18 O profile. Through the comparison with the artificial isotopic profile, the noise input from the diffusion process was the dominant component in the δ 18 O signal. Although some other processes (such as drifting, ventilation and metamorphism) were not fully considered, the quantitative understanding for the sublimation–condensation and diffusion processes will contribute to the paleoclimate construction using the ice core water isotope records at Dome A. |
format |
Article in Journal/Newspaper |
author |
Tianming Ma Li Li Guitao Shi Yuansheng Li |
author_facet |
Tianming Ma Li Li Guitao Shi Yuansheng Li |
author_sort |
Tianming Ma |
title |
Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
title_short |
Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
title_full |
Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
title_fullStr |
Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
title_full_unstemmed |
Acquisition of Post-Depositional Effects on Stable Isotopes (δ 18 O and δD) of Snow and Firn at Dome A, East Antarctica |
title_sort |
acquisition of post-depositional effects on stable isotopes (δ 18 o and δd) of snow and firn at dome a, east antarctica |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/w12061707 https://doaj.org/article/1ffc63e5084643d2a41a7cd867c9beb8 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core |
op_source |
Water, Vol 12, Iss 1707, p 1707 (2020) |
op_relation |
https://www.mdpi.com/2073-4441/12/6/1707 https://doaj.org/toc/2073-4441 doi:10.3390/w12061707 2073-4441 https://doaj.org/article/1ffc63e5084643d2a41a7cd867c9beb8 |
op_doi |
https://doi.org/10.3390/w12061707 |
container_title |
Water |
container_volume |
12 |
container_issue |
6 |
container_start_page |
1707 |
_version_ |
1766265157786271744 |