Sources of particulate organic matter discharged by the Lena River using lignin phenols
Particulate organic matter (POM) discharged by rivers and deposited offshore their mouths is generally assumed to record an integrated signal from the watershed and therefore provides an archive of past environmental changes. Yet, in large river systems the riverine POM might be trapped in flood pla...
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ftawi:oai:epic.awi.de:42321 2024-09-15T18:17:43+00:00 Sources of particulate organic matter discharged by the Lena River using lignin phenols Winterfeld, Maria Trojahn, Sara Hefter, Jens Pittauer, Daniela Zubrzycki, Sebastian Han, Pai Rethemeyer, Janet Mollenhauer, Gesine 2016-12-13 https://epic.awi.de/id/eprint/42321/ https://hdl.handle.net/10013/epic.49403 unknown Winterfeld, M. , Trojahn, S. , Hefter, J. orcid:0000-0002-5823-1966 , Pittauer, D. , Zubrzycki, S. , Han, P. , Rethemeyer, J. and Mollenhauer, G. orcid:0000-0001-5138-564X (2016) Sources of particulate organic matter discharged by the Lena River using lignin phenols , AGU Fall meeting, San Francisco, 11 December 2016 - 16 December 2016 . hdl:10013/epic.49403 EPIC3AGU Fall meeting, San Francisco, 2016-12-11-2016-12-16 Conference notRev 2016 ftawi 2024-06-24T04:15:36Z Particulate organic matter (POM) discharged by rivers and deposited offshore their mouths is generally assumed to record an integrated signal from the watershed and therefore provides an archive of past environmental changes. Yet, in large river systems the riverine POM might be trapped in flood plains and the lower reaches resulting in an inefficient transport of POM particularly from the distal parts of the watershed. Further, the POM likely undergoes degradation during transport from source to sink. The Lena River is one of these large river systems stretching from 53°N to 71°N in central Siberia. The watershed can be broadly divided into two different biomes, taiga in the south and tundra in the northernmost part. The relative contribution of these biomes to the POM load of the river and its discharge to the ocean as well as the changes it is undergoing during transport are not well understood. Here we present the lignin phenol composition of different grain size fractions (bulk, 2mm-63µm, <63µm) of soil samples taken along a latitudinal transect (63°N to 72°N) as well as in marine surface sediments and two short sediment cores covering the last 120 years offshore the main Lena discharge channels. The lignin phenol composition of the soil samples (bulk, 2mm-63µm, <63µm) reflects the change in vegetation from south to north with increasing contribution of tundra vegetation. The degree of degradation between the soil sample locations as well as grain size fractions was very heterogeneous and did not show a clear trend. However, the POM seems to be slightly more degraded in the tundra, which is unexpected as the summer period when degradation in the upper thawed part of the soil can take place is shorter in the tundra compared to the southern taiga region. The marine surface sediments were dominated by gymnosperm-derived POM, particularly close to the river mouth and in the <63µm fraction. Because of the large heterogeneity of organic matter degradation in the soil samples and their grain size ... Conference Object lena river taiga Tundra Siberia 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 |
language |
unknown |
description |
Particulate organic matter (POM) discharged by rivers and deposited offshore their mouths is generally assumed to record an integrated signal from the watershed and therefore provides an archive of past environmental changes. Yet, in large river systems the riverine POM might be trapped in flood plains and the lower reaches resulting in an inefficient transport of POM particularly from the distal parts of the watershed. Further, the POM likely undergoes degradation during transport from source to sink. The Lena River is one of these large river systems stretching from 53°N to 71°N in central Siberia. The watershed can be broadly divided into two different biomes, taiga in the south and tundra in the northernmost part. The relative contribution of these biomes to the POM load of the river and its discharge to the ocean as well as the changes it is undergoing during transport are not well understood. Here we present the lignin phenol composition of different grain size fractions (bulk, 2mm-63µm, <63µm) of soil samples taken along a latitudinal transect (63°N to 72°N) as well as in marine surface sediments and two short sediment cores covering the last 120 years offshore the main Lena discharge channels. The lignin phenol composition of the soil samples (bulk, 2mm-63µm, <63µm) reflects the change in vegetation from south to north with increasing contribution of tundra vegetation. The degree of degradation between the soil sample locations as well as grain size fractions was very heterogeneous and did not show a clear trend. However, the POM seems to be slightly more degraded in the tundra, which is unexpected as the summer period when degradation in the upper thawed part of the soil can take place is shorter in the tundra compared to the southern taiga region. The marine surface sediments were dominated by gymnosperm-derived POM, particularly close to the river mouth and in the <63µm fraction. Because of the large heterogeneity of organic matter degradation in the soil samples and their grain size ... |
format |
Conference Object |
author |
Winterfeld, Maria Trojahn, Sara Hefter, Jens Pittauer, Daniela Zubrzycki, Sebastian Han, Pai Rethemeyer, Janet Mollenhauer, Gesine |
spellingShingle |
Winterfeld, Maria Trojahn, Sara Hefter, Jens Pittauer, Daniela Zubrzycki, Sebastian Han, Pai Rethemeyer, Janet Mollenhauer, Gesine Sources of particulate organic matter discharged by the Lena River using lignin phenols |
author_facet |
Winterfeld, Maria Trojahn, Sara Hefter, Jens Pittauer, Daniela Zubrzycki, Sebastian Han, Pai Rethemeyer, Janet Mollenhauer, Gesine |
author_sort |
Winterfeld, Maria |
title |
Sources of particulate organic matter discharged by the Lena River using lignin phenols |
title_short |
Sources of particulate organic matter discharged by the Lena River using lignin phenols |
title_full |
Sources of particulate organic matter discharged by the Lena River using lignin phenols |
title_fullStr |
Sources of particulate organic matter discharged by the Lena River using lignin phenols |
title_full_unstemmed |
Sources of particulate organic matter discharged by the Lena River using lignin phenols |
title_sort |
sources of particulate organic matter discharged by the lena river using lignin phenols |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42321/ https://hdl.handle.net/10013/epic.49403 |
genre |
lena river taiga Tundra Siberia |
genre_facet |
lena river taiga Tundra Siberia |
op_source |
EPIC3AGU Fall meeting, San Francisco, 2016-12-11-2016-12-16 |
op_relation |
Winterfeld, M. , Trojahn, S. , Hefter, J. orcid:0000-0002-5823-1966 , Pittauer, D. , Zubrzycki, S. , Han, P. , Rethemeyer, J. and Mollenhauer, G. orcid:0000-0001-5138-564X (2016) Sources of particulate organic matter discharged by the Lena River using lignin phenols , AGU Fall meeting, San Francisco, 11 December 2016 - 16 December 2016 . hdl:10013/epic.49403 |
_version_ |
1810455818792861696 |