Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf
The Siberian Arctic contains a globally significant pool of organic carbon (OC) vulnerable to enhanced warming and subsequent release by both fluvial and coastal erosion processes. However, the rate of release, its behaviour in the Arctic Ocean and vulnerability to remineralisation is poorly underst...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011616 2023-05-15T14:51:13+02:00 Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf Bischoff, Juliane Sparkes, Robert B. Doğrul Selver, Ayça Spencer, Robert G. M. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wagner, Dirk Rivkina, Elizaveta van Dongen, Bart E. Talbot, Helen M. 2016-09 electronic https://doi.org/10.5194/bg-13-4899-2016 https://noa.gwlb.de/receive/cop_mods_00011616 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011573/bg-13-4899-2016.pdf https://bg.copernicus.org/articles/13/4899/2016/bg-13-4899-2016.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-4899-2016 https://noa.gwlb.de/receive/cop_mods_00011616 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011573/bg-13-4899-2016.pdf https://bg.copernicus.org/articles/13/4899/2016/bg-13-4899-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/bg-13-4899-2016 2022-02-08T22:56:25Z The Siberian Arctic contains a globally significant pool of organic carbon (OC) vulnerable to enhanced warming and subsequent release by both fluvial and coastal erosion processes. However, the rate of release, its behaviour in the Arctic Ocean and vulnerability to remineralisation is poorly understood. Here we combine new measurements of microbial biohopanoids including adenosylhopane, a lipid associated with soil microbial communities, with published glycerol dialkyl glycerol tetraethers (GDGTs) and bulk δ13C measurements to improve knowledge of the fate of OC transported to the East Siberian Arctic Shelf (ESAS). The microbial hopanoid-based soil OC proxy R′soil ranges from 0.0 to 0.8 across the ESAS, with highest values nearshore and decreases offshore. Across the shelf R′soil displays a negative linear correlation with bulk δ13C measurements (r2 = −0.73, p = < 0.001). When compared to the GDGT-based OC proxy, the branched and isoprenoid tetraether (BIT) index, a decoupled (non-linear) behaviour on the shelf was observed, particularly in the Buor-Khaya Bay, where the R′soil shows limited variation, whereas the BIT index shows a rapid decline moving away from the Lena River outflow channels. This reflects a balance between delivery and removal of OC from different sources. The good correlation between the hopanoid and bulk terrestrial signal suggests a broad range of hopanoid sources, both fluvial and via coastal erosion, whilst GDGTs appear to be primarily sourced via fluvial transport. Analysis of ice complex deposits (ICDs) revealed an average R′soil of 0.5 for the Lena Delta, equivalent to that of the Buor-Khaya Bay sediments, whilst ICDs from further east showed higher values (0.6–0.85). Although R′soil correlates more closely with bulk OC than the BIT, our understanding of the endmembers of this system is clearly still incomplete, with variations between the different East Siberian Arctic regions potentially reflecting differences in environmental conditions (e.g. temperature, pH), but other physiological controls on microbial bacteriohopanepolyol (BHP) production under psychrophilic conditions are as yet unknown. Article in Journal/Newspaper Arctic Arctic Ocean lena delta lena river Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Khaya ENVELOPE(135.167,135.167,60.567,60.567) Buor-Khaya ENVELOPE(127.803,127.803,72.287,72.287) Biogeosciences 13 17 4899 4914 |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Bischoff, Juliane Sparkes, Robert B. Doğrul Selver, Ayça Spencer, Robert G. M. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wagner, Dirk Rivkina, Elizaveta van Dongen, Bart E. Talbot, Helen M. Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
topic_facet |
article Verlagsveröffentlichung |
description |
The Siberian Arctic contains a globally significant pool of organic carbon (OC) vulnerable to enhanced warming and subsequent release by both fluvial and coastal erosion processes. However, the rate of release, its behaviour in the Arctic Ocean and vulnerability to remineralisation is poorly understood. Here we combine new measurements of microbial biohopanoids including adenosylhopane, a lipid associated with soil microbial communities, with published glycerol dialkyl glycerol tetraethers (GDGTs) and bulk δ13C measurements to improve knowledge of the fate of OC transported to the East Siberian Arctic Shelf (ESAS). The microbial hopanoid-based soil OC proxy R′soil ranges from 0.0 to 0.8 across the ESAS, with highest values nearshore and decreases offshore. Across the shelf R′soil displays a negative linear correlation with bulk δ13C measurements (r2 = −0.73, p = < 0.001). When compared to the GDGT-based OC proxy, the branched and isoprenoid tetraether (BIT) index, a decoupled (non-linear) behaviour on the shelf was observed, particularly in the Buor-Khaya Bay, where the R′soil shows limited variation, whereas the BIT index shows a rapid decline moving away from the Lena River outflow channels. This reflects a balance between delivery and removal of OC from different sources. The good correlation between the hopanoid and bulk terrestrial signal suggests a broad range of hopanoid sources, both fluvial and via coastal erosion, whilst GDGTs appear to be primarily sourced via fluvial transport. Analysis of ice complex deposits (ICDs) revealed an average R′soil of 0.5 for the Lena Delta, equivalent to that of the Buor-Khaya Bay sediments, whilst ICDs from further east showed higher values (0.6–0.85). Although R′soil correlates more closely with bulk OC than the BIT, our understanding of the endmembers of this system is clearly still incomplete, with variations between the different East Siberian Arctic regions potentially reflecting differences in environmental conditions (e.g. temperature, pH), but other physiological controls on microbial bacteriohopanepolyol (BHP) production under psychrophilic conditions are as yet unknown. |
format |
Article in Journal/Newspaper |
author |
Bischoff, Juliane Sparkes, Robert B. Doğrul Selver, Ayça Spencer, Robert G. M. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wagner, Dirk Rivkina, Elizaveta van Dongen, Bart E. Talbot, Helen M. |
author_facet |
Bischoff, Juliane Sparkes, Robert B. Doğrul Selver, Ayça Spencer, Robert G. M. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wagner, Dirk Rivkina, Elizaveta van Dongen, Bart E. Talbot, Helen M. |
author_sort |
Bischoff, Juliane |
title |
Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
title_short |
Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
title_full |
Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
title_fullStr |
Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
title_full_unstemmed |
Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf |
title_sort |
source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the east siberian arctic shelf |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-4899-2016 https://noa.gwlb.de/receive/cop_mods_00011616 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011573/bg-13-4899-2016.pdf https://bg.copernicus.org/articles/13/4899/2016/bg-13-4899-2016.pdf |
long_lat |
ENVELOPE(135.167,135.167,60.567,60.567) ENVELOPE(127.803,127.803,72.287,72.287) |
geographic |
Arctic Arctic Ocean Khaya Buor-Khaya |
geographic_facet |
Arctic Arctic Ocean Khaya Buor-Khaya |
genre |
Arctic Arctic Ocean lena delta lena river |
genre_facet |
Arctic Arctic Ocean lena delta lena river |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-4899-2016 https://noa.gwlb.de/receive/cop_mods_00011616 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011573/bg-13-4899-2016.pdf https://bg.copernicus.org/articles/13/4899/2016/bg-13-4899-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-4899-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
17 |
container_start_page |
4899 |
op_container_end_page |
4914 |
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1766322267211431936 |