Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica
Reliable records of Southern Ocean seawater palaeotemperatures are important because this region plays a significant role in regulating global climate change. Biomarkers such as GDGT-based indices have been effectively used to reconstruct seawater temperatures. We analysed the composition and distri...
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Norwegian Polar Institute
2020
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Online Access: | https://doi.org/10.33265/polar.v39.3557 https://doaj.org/article/cb3e6d2f3c1d440ca9b131a03ce589c0 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:cb3e6d2f3c1d440ca9b131a03ce589c0 2023-05-15T13:57:31+02:00 Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica Ruijuan Liu Zhengbing Han Jun Zhao Haifeng Zhang Dong Li Jianye Ren Jianming Pan Haisheng Zhang 2020-07-01 https://doi.org/10.33265/polar.v39.3557 https://doaj.org/article/cb3e6d2f3c1d440ca9b131a03ce589c0 en eng Norwegian Polar Institute 1751-8369 doi:10.33265/polar.v39.3557 https://doaj.org/article/cb3e6d2f3c1d440ca9b131a03ce589c0 undefined Polar Research, Vol 39, Iss 0, Pp 1-15 (2020) biomarkers archaea seawater temperature palaeotemperature indices antarctic marginal seas geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.33265/polar.v39.3557 2023-01-22T19:24:48Z Reliable records of Southern Ocean seawater palaeotemperatures are important because this region plays a significant role in regulating global climate change. Biomarkers such as GDGT-based indices have been effectively used to reconstruct seawater temperatures. We analysed the composition and distribution of iGDGTs, OH-GDGTs and brGDGTs and calculated GDGT-based temperature indices in surface sediments from Prydz Bay, East Antarctica. Our results showed that iGDGTs, OH-GDGTs and brGDGTs are all produced in situ, with iGDGTs and OH-GDGTs mostly synthesized by Thaumarchaeota. Concentrations of iGDGTs, OH-GDGTs and brGDGTs showed similar spatial distributions and decreased from the continental shelf towards the deep ocean. The highest concentrations were in the inner bay, which is attributed to a combination of (1) bathymetry that reduces water exchange, (2) the Prydz Bay Gyre stabilizing the upper water column and (3) sea ice that releases archaea and bacteria. Among the temperature indices based on iGDGTs, OH-GDGTs and combinations therein, those based on OH-GDGTs showed the strongest correlation with seawater temperature. Some OH-GDGT-based indices (e.g., OH-0/OHs, OH-1/OHs, OH-2/OHs and RI-OH′) exhibited a stronger correlation with annual subsurface ocean temperature (100–200 m), which may be related to archaeal habitats and production mechanisms. Our study suggests that RI-OH′ and OH-0/OHs could be used as indicators of annual subsurface ocean temperature in Antarctic marginal seas. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Polar Research Prydz Bay Sea ice Southern Ocean Unknown Antarctic East Antarctica Inner Bay ENVELOPE(-37.967,-37.967,-54.017,-54.017) Prydz Bay Southern Ocean Polar Research 39 0 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
biomarkers archaea seawater temperature palaeotemperature indices antarctic marginal seas geo envir |
spellingShingle |
biomarkers archaea seawater temperature palaeotemperature indices antarctic marginal seas geo envir Ruijuan Liu Zhengbing Han Jun Zhao Haifeng Zhang Dong Li Jianye Ren Jianming Pan Haisheng Zhang Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
topic_facet |
biomarkers archaea seawater temperature palaeotemperature indices antarctic marginal seas geo envir |
description |
Reliable records of Southern Ocean seawater palaeotemperatures are important because this region plays a significant role in regulating global climate change. Biomarkers such as GDGT-based indices have been effectively used to reconstruct seawater temperatures. We analysed the composition and distribution of iGDGTs, OH-GDGTs and brGDGTs and calculated GDGT-based temperature indices in surface sediments from Prydz Bay, East Antarctica. Our results showed that iGDGTs, OH-GDGTs and brGDGTs are all produced in situ, with iGDGTs and OH-GDGTs mostly synthesized by Thaumarchaeota. Concentrations of iGDGTs, OH-GDGTs and brGDGTs showed similar spatial distributions and decreased from the continental shelf towards the deep ocean. The highest concentrations were in the inner bay, which is attributed to a combination of (1) bathymetry that reduces water exchange, (2) the Prydz Bay Gyre stabilizing the upper water column and (3) sea ice that releases archaea and bacteria. Among the temperature indices based on iGDGTs, OH-GDGTs and combinations therein, those based on OH-GDGTs showed the strongest correlation with seawater temperature. Some OH-GDGT-based indices (e.g., OH-0/OHs, OH-1/OHs, OH-2/OHs and RI-OH′) exhibited a stronger correlation with annual subsurface ocean temperature (100–200 m), which may be related to archaeal habitats and production mechanisms. Our study suggests that RI-OH′ and OH-0/OHs could be used as indicators of annual subsurface ocean temperature in Antarctic marginal seas. |
format |
Article in Journal/Newspaper |
author |
Ruijuan Liu Zhengbing Han Jun Zhao Haifeng Zhang Dong Li Jianye Ren Jianming Pan Haisheng Zhang |
author_facet |
Ruijuan Liu Zhengbing Han Jun Zhao Haifeng Zhang Dong Li Jianye Ren Jianming Pan Haisheng Zhang |
author_sort |
Ruijuan Liu |
title |
Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
title_short |
Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
title_full |
Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
title_fullStr |
Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
title_full_unstemmed |
Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica |
title_sort |
distribution and source of glycerol dialkyl glycerol tetraethers (gdgts) and the applicability of gdgt-based temperature proxies in surface sediments of prydz bay, east antarctica |
publisher |
Norwegian Polar Institute |
publishDate |
2020 |
url |
https://doi.org/10.33265/polar.v39.3557 https://doaj.org/article/cb3e6d2f3c1d440ca9b131a03ce589c0 |
long_lat |
ENVELOPE(-37.967,-37.967,-54.017,-54.017) |
geographic |
Antarctic East Antarctica Inner Bay Prydz Bay Southern Ocean |
geographic_facet |
Antarctic East Antarctica Inner Bay Prydz Bay Southern Ocean |
genre |
Antarc* Antarctic Antarctica East Antarctica Polar Research Prydz Bay Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Polar Research Prydz Bay Sea ice Southern Ocean |
op_source |
Polar Research, Vol 39, Iss 0, Pp 1-15 (2020) |
op_relation |
1751-8369 doi:10.33265/polar.v39.3557 https://doaj.org/article/cb3e6d2f3c1d440ca9b131a03ce589c0 |
op_rights |
undefined |
op_doi |
https://doi.org/10.33265/polar.v39.3557 |
container_title |
Polar Research |
container_volume |
39 |
container_issue |
0 |
_version_ |
1766265189887377408 |