Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf
Warming air temperatures, shifting hydrological regimes and accelerating permafrost thaw in the catchments of the Arctic rivers is affecting their biogeochemistry. Arctic river monitoring is necessary to observe changes in the mobilization of dissolved organic matter (DOM) from permafrost. The Lena...
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ftfrontimediafig:oai:figshare.com:article/12311663 2023-05-15T14:53:10+02:00 Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf Bennet Juhls Colin A. Stedmon Anne Morgenstern Hanno Meyer Jens Hölemann Birgit Heim Vasily Povazhnyi Pier P. Overduin 2020-05-15T14:15:27Z https://doi.org/10.3389/fenvs.2020.00053.s001 https://figshare.com/articles/Data_Sheet_1_Identifying_Drivers_of_Seasonality_in_Lena_River_Biogeochemistry_and_Dissolved_Organic_Matter_Fluxes_pdf/12311663 unknown doi:10.3389/fenvs.2020.00053.s001 https://figshare.com/articles/Data_Sheet_1_Identifying_Drivers_of_Seasonality_in_Lena_River_Biogeochemistry_and_Dissolved_Organic_Matter_Fluxes_pdf/12311663 CC BY 4.0 CC-BY Environmental Science Climate Science Environmental Impact Assessment Environmental Management Soil Biology Water Treatment Processes Environmental Engineering Design Environmental Engineering Modelling Environmental Technologies Lena River Arctic DOC CDOM optical indices stable water isotopes Dataset 2020 ftfrontimediafig https://doi.org/10.3389/fenvs.2020.00053.s001 2020-05-20T22:54:18Z Warming air temperatures, shifting hydrological regimes and accelerating permafrost thaw in the catchments of the Arctic rivers is affecting their biogeochemistry. Arctic river monitoring is necessary to observe changes in the mobilization of dissolved organic matter (DOM) from permafrost. The Lena River is the second largest Arctic river and 71% of its catchment is continuous permafrost. Biogeochemical parameters, including temperature, electrical conductivity (EC), stable water isotopes, dissolved organic carbon (DOC) and absorption by colored dissolved organic matter (a CDOM ) have been measured as part of a new high-frequency sampling program in the central Lena River Delta. The results show strong seasonal variations of all biogeochemical parameters that generally follow seasonal patterns of the hydrograph. Optical indices of DOM indicate a trend of decreasing aromaticity and molecular weight from spring to winter. High-frequency sampling improved our estimated annual fluvial flux of annual dissolved organic carbon flux (6.79 Tg C). EC and stable isotope data were used to distinguish three different source water types which explain most of the seasonal variation in the biogeochemistry of the Lena River. These water types match signatures of (1) melt water, (2) rain water, and (3) subsurface water. Melt water and rain water accounted for 84% of the discharge flux and 86% of the DOC flux. The optical properties of melt water DOM were characteristic of fresh organic matter. In contrast, the optical properties of DOM in subsurface water revealed lower aromaticity and lower molecular weights, which indicate a shift toward an older organic matter source mobilized from deeper soil horizons or permafrost deposits. The first year of this new sampling program sets a new baseline for flux calculations of dissolved matter and has enabled the identification and characterization of water types that drive the seasonality of the Lena River water properties. Dataset Arctic lena river permafrost Frontiers: Figshare Arctic |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Environmental Science Climate Science Environmental Impact Assessment Environmental Management Soil Biology Water Treatment Processes Environmental Engineering Design Environmental Engineering Modelling Environmental Technologies Lena River Arctic DOC CDOM optical indices stable water isotopes |
spellingShingle |
Environmental Science Climate Science Environmental Impact Assessment Environmental Management Soil Biology Water Treatment Processes Environmental Engineering Design Environmental Engineering Modelling Environmental Technologies Lena River Arctic DOC CDOM optical indices stable water isotopes Bennet Juhls Colin A. Stedmon Anne Morgenstern Hanno Meyer Jens Hölemann Birgit Heim Vasily Povazhnyi Pier P. Overduin Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
topic_facet |
Environmental Science Climate Science Environmental Impact Assessment Environmental Management Soil Biology Water Treatment Processes Environmental Engineering Design Environmental Engineering Modelling Environmental Technologies Lena River Arctic DOC CDOM optical indices stable water isotopes |
description |
Warming air temperatures, shifting hydrological regimes and accelerating permafrost thaw in the catchments of the Arctic rivers is affecting their biogeochemistry. Arctic river monitoring is necessary to observe changes in the mobilization of dissolved organic matter (DOM) from permafrost. The Lena River is the second largest Arctic river and 71% of its catchment is continuous permafrost. Biogeochemical parameters, including temperature, electrical conductivity (EC), stable water isotopes, dissolved organic carbon (DOC) and absorption by colored dissolved organic matter (a CDOM ) have been measured as part of a new high-frequency sampling program in the central Lena River Delta. The results show strong seasonal variations of all biogeochemical parameters that generally follow seasonal patterns of the hydrograph. Optical indices of DOM indicate a trend of decreasing aromaticity and molecular weight from spring to winter. High-frequency sampling improved our estimated annual fluvial flux of annual dissolved organic carbon flux (6.79 Tg C). EC and stable isotope data were used to distinguish three different source water types which explain most of the seasonal variation in the biogeochemistry of the Lena River. These water types match signatures of (1) melt water, (2) rain water, and (3) subsurface water. Melt water and rain water accounted for 84% of the discharge flux and 86% of the DOC flux. The optical properties of melt water DOM were characteristic of fresh organic matter. In contrast, the optical properties of DOM in subsurface water revealed lower aromaticity and lower molecular weights, which indicate a shift toward an older organic matter source mobilized from deeper soil horizons or permafrost deposits. The first year of this new sampling program sets a new baseline for flux calculations of dissolved matter and has enabled the identification and characterization of water types that drive the seasonality of the Lena River water properties. |
format |
Dataset |
author |
Bennet Juhls Colin A. Stedmon Anne Morgenstern Hanno Meyer Jens Hölemann Birgit Heim Vasily Povazhnyi Pier P. Overduin |
author_facet |
Bennet Juhls Colin A. Stedmon Anne Morgenstern Hanno Meyer Jens Hölemann Birgit Heim Vasily Povazhnyi Pier P. Overduin |
author_sort |
Bennet Juhls |
title |
Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
title_short |
Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
title_full |
Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
title_fullStr |
Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
title_full_unstemmed |
Data_Sheet_1_Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes.pdf |
title_sort |
data_sheet_1_identifying drivers of seasonality in lena river biogeochemistry and dissolved organic matter fluxes.pdf |
publishDate |
2020 |
url |
https://doi.org/10.3389/fenvs.2020.00053.s001 https://figshare.com/articles/Data_Sheet_1_Identifying_Drivers_of_Seasonality_in_Lena_River_Biogeochemistry_and_Dissolved_Organic_Matter_Fluxes_pdf/12311663 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic lena river permafrost |
genre_facet |
Arctic lena river permafrost |
op_relation |
doi:10.3389/fenvs.2020.00053.s001 https://figshare.com/articles/Data_Sheet_1_Identifying_Drivers_of_Seasonality_in_Lena_River_Biogeochemistry_and_Dissolved_Organic_Matter_Fluxes_pdf/12311663 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fenvs.2020.00053.s001 |
_version_ |
1766324582420054016 |