Isotopic composition of dissolved and particulate organic carbon in Lena Delta
The Lena River is one of the biggest Arctic rivers. Continuous permafrost covers about 72-80% of the drainage area, which will thaw with ongoing climate warming. Thus, the Lena potentially releases large quantities of permafrost-derived organic matter (OM) to the world’s largest continental shelf: t...
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ftawi:oai:epic.awi.de:51406 2024-09-15T17:50:35+00:00 Isotopic composition of dissolved and particulate organic carbon in Lena Delta Ogneva, Olga Mollenhauer, Gesine Grotheer, Hendrik Winterfeld, Maria Mann, Paul James Strauss, Jens 2020-01-14 https://epic.awi.de/id/eprint/51406/ https://hdl.handle.net/10013/epic.12bf9a9f-e71b-4d3f-9f2f-a4d439e64440 unknown Ogneva, O. orcid:0000-0002-9309-2076 , Mollenhauer, G. orcid:0000-0001-5138-564X , Grotheer, H. orcid:0000-0003-0207-3767 , Winterfeld, M. , Mann, P. J. orcid:0000-0002-6221-3533 and Strauss, J. orcid:0000-0003-4678-4982 (2020) Isotopic composition of dissolved and particulate organic carbon in Lena Delta , Arktis im Wandel - Changing Arctic Ocean - Annual Science Meeting, Potsdam, Germany, 14 January 2020 - 16 January 2020 . hdl:10013/epic.12bf9a9f-e71b-4d3f-9f2f-a4d439e64440 EPIC3Arktis im Wandel - Changing Arctic Ocean - Annual Science Meeting, Potsdam, Germany, 2020-01-14-2020-01-16 Conference notRev 2020 ftawi 2024-06-24T04:23:24Z The Lena River is one of the biggest Arctic rivers. Continuous permafrost covers about 72-80% of the drainage area, which will thaw with ongoing climate warming. Thus, the Lena potentially releases large quantities of permafrost-derived organic matter (OM) to the world’s largest continental shelf: the East Siberian Arctic Shelf. This OM consists of a complex mixture of compounds from different aquatic and terrigenous sources with different chemical/physical resistance towards decomposition and mineralization. Determining the sources (e.g., permafrost, soil, peat, phytoplankton, vegetation, etc.), quality and age of organic carbon (OC) transported by Arctic rivers is important to understand the effects of climate change on the river watersheds as well as on the Arctic coastal zone. Here we show results on composition and age of OM in Lena River. We collected the samples during the summer seasons of 2016, 2017 at the southern limit of the Lena Delta (Stolb Island). Water was sampled from three depths (surface, middle of stream and above the riverbed), two times per season. Stable carbon isotopes (δ13C) and radiocarbon values (Δ14C) were determined for particulate and dissolved organic carbon (POC and DOC, respectively). Our data show significant variations of POC isotopic composition between the studied years and within every season as well, while DOC isotopic values are more stable. POM appears to originate from older sources than DOM, as DO14C values are higher and indicative of more modern sources like recent terrestrial vegetation and aquatic primary production. Thus, isotopic survey illustrates spatial and temporal variability of POM composition and age in Lena Delta. Conference Object Arctic Climate change lena delta lena river permafrost Phytoplankton Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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The Lena River is one of the biggest Arctic rivers. Continuous permafrost covers about 72-80% of the drainage area, which will thaw with ongoing climate warming. Thus, the Lena potentially releases large quantities of permafrost-derived organic matter (OM) to the world’s largest continental shelf: the East Siberian Arctic Shelf. This OM consists of a complex mixture of compounds from different aquatic and terrigenous sources with different chemical/physical resistance towards decomposition and mineralization. Determining the sources (e.g., permafrost, soil, peat, phytoplankton, vegetation, etc.), quality and age of organic carbon (OC) transported by Arctic rivers is important to understand the effects of climate change on the river watersheds as well as on the Arctic coastal zone. Here we show results on composition and age of OM in Lena River. We collected the samples during the summer seasons of 2016, 2017 at the southern limit of the Lena Delta (Stolb Island). Water was sampled from three depths (surface, middle of stream and above the riverbed), two times per season. Stable carbon isotopes (δ13C) and radiocarbon values (Δ14C) were determined for particulate and dissolved organic carbon (POC and DOC, respectively). Our data show significant variations of POC isotopic composition between the studied years and within every season as well, while DOC isotopic values are more stable. POM appears to originate from older sources than DOM, as DO14C values are higher and indicative of more modern sources like recent terrestrial vegetation and aquatic primary production. Thus, isotopic survey illustrates spatial and temporal variability of POM composition and age in Lena Delta. |
format |
Conference Object |
author |
Ogneva, Olga Mollenhauer, Gesine Grotheer, Hendrik Winterfeld, Maria Mann, Paul James Strauss, Jens |
spellingShingle |
Ogneva, Olga Mollenhauer, Gesine Grotheer, Hendrik Winterfeld, Maria Mann, Paul James Strauss, Jens Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
author_facet |
Ogneva, Olga Mollenhauer, Gesine Grotheer, Hendrik Winterfeld, Maria Mann, Paul James Strauss, Jens |
author_sort |
Ogneva, Olga |
title |
Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
title_short |
Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
title_full |
Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
title_fullStr |
Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
title_full_unstemmed |
Isotopic composition of dissolved and particulate organic carbon in Lena Delta |
title_sort |
isotopic composition of dissolved and particulate organic carbon in lena delta |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/51406/ https://hdl.handle.net/10013/epic.12bf9a9f-e71b-4d3f-9f2f-a4d439e64440 |
genre |
Arctic Climate change lena delta lena river permafrost Phytoplankton |
genre_facet |
Arctic Climate change lena delta lena river permafrost Phytoplankton |
op_source |
EPIC3Arktis im Wandel - Changing Arctic Ocean - Annual Science Meeting, Potsdam, Germany, 2020-01-14-2020-01-16 |
op_relation |
Ogneva, O. orcid:0000-0002-9309-2076 , Mollenhauer, G. orcid:0000-0001-5138-564X , Grotheer, H. orcid:0000-0003-0207-3767 , Winterfeld, M. , Mann, P. J. orcid:0000-0002-6221-3533 and Strauss, J. orcid:0000-0003-4678-4982 (2020) Isotopic composition of dissolved and particulate organic carbon in Lena Delta , Arktis im Wandel - Changing Arctic Ocean - Annual Science Meeting, Potsdam, Germany, 14 January 2020 - 16 January 2020 . hdl:10013/epic.12bf9a9f-e71b-4d3f-9f2f-a4d439e64440 |
_version_ |
1810292398942584832 |