Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia
In the past decades the Arctic has experienced stronger temperature increases than any other region globally. Shifts in hydrological regimes and accelerated permafrost thawing have been observed and are likely to increase mobilization of organic carbon and its transport through rivers into the Arcti...
Published in: | Frontiers in Marine Science |
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Frontiers Media SA
2023
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Online Access: | https://epic.awi.de/id/eprint/57677/ https://epic.awi.de/id/eprint/57677/1/ElKassar_et-al_2023_FrontiersMarRes.pdf https://hdl.handle.net/10013/epic.cb9b8224-266a-4e04-932d-e219256e1d2a |
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ftawi:oai:epic.awi.de:57677 2024-09-09T19:23:04+00:00 Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia El Kassar, Jan Juhls, Bennet Hieronymi, Martin Preusker, Rene Morgenstern, Anne Fischer, Jürgen Overduin, Pier Paul 2023-03-17 application/pdf https://epic.awi.de/id/eprint/57677/ https://epic.awi.de/id/eprint/57677/1/ElKassar_et-al_2023_FrontiersMarRes.pdf https://hdl.handle.net/10013/epic.cb9b8224-266a-4e04-932d-e219256e1d2a unknown Frontiers Media SA https://epic.awi.de/id/eprint/57677/1/ElKassar_et-al_2023_FrontiersMarRes.pdf El Kassar, J. , Juhls, B. , Hieronymi, M. , Preusker, R. , Morgenstern, A. , Fischer, J. and Overduin, P. P. (2023) Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia , Frontiers in Marine Science, 10 , p. 1082109 . doi:10.3389/fmars.2023.1082109 <https://doi.org/10.3389/fmars.2023.1082109> , hdl:10013/epic.cb9b8224-266a-4e04-932d-e219256e1d2a EPIC3Frontiers in Marine Science, Frontiers Media SA, 10, pp. 1082109-1082109, ISSN: 2296-7745 Article isiRev 2023 ftawi https://doi.org/10.3389/fmars.2023.1082109 2024-06-24T04:30:12Z In the past decades the Arctic has experienced stronger temperature increases than any other region globally. Shifts in hydrological regimes and accelerated permafrost thawing have been observed and are likely to increase mobilization of organic carbon and its transport through rivers into the Arctic Ocean. In order to better quantify changes to the carbon cycle, Arctic rivers such as the Lena River in Siberia need to be monitored closely. Since 2018, a sampling program provides frequent in situ observations of dissolved organic carbon (DOC) and colored dissolved organic matter (CDOM) of the Lena River. Here, we utilize this ground truth dataset and aim to test the potential of frequent satellite observations to spatially and temporally complement and expand these observations. We explored all available overpasses (~3250) of the Ocean and Land Colour Instrument (OLCI) on Sentinel-3 within the ice-free periods (May – October) for four years (2018 to 2021) to develop a new retrieval scheme to derive concentrations of DOC. OLCI observations with a spatial resolution of ~300 m were corrected for atmospheric effects using the Polymer algorithm. The results of this study show that using this new retrieval, remotely sensed DOC concentrations agree well with in situ DOC concentrations (MAPD=10.89%, RMSE=1.55 mg L−1, r²=0.92, n=489). The high revisit frequency and wide swath of OLCI allow it to capture the entire range of DOC concentrations and their seasonal variability. Estimated satellite-derived DOC export fluxes integrated over the ice-free periods of 2018 to 2021 show a high interannual variability and agree well with flux estimates from in situ data (RMSD=0.186 Tg C, MAPD=4.05%). In addition, 10-day OLCI composites covering the entire Lena River catchment revealed increasing DOC concentration and local sources of DOC along the Lena from south to north. We conclude that moderate resolution satellite imagers such as OLCI are very capable of observing DOC concentrations in large/wide rivers such as the Lena River ... Article in Journal/Newspaper Arctic Arctic Ocean Ice lena river permafrost Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Frontiers in Marine Science 10 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
In the past decades the Arctic has experienced stronger temperature increases than any other region globally. Shifts in hydrological regimes and accelerated permafrost thawing have been observed and are likely to increase mobilization of organic carbon and its transport through rivers into the Arctic Ocean. In order to better quantify changes to the carbon cycle, Arctic rivers such as the Lena River in Siberia need to be monitored closely. Since 2018, a sampling program provides frequent in situ observations of dissolved organic carbon (DOC) and colored dissolved organic matter (CDOM) of the Lena River. Here, we utilize this ground truth dataset and aim to test the potential of frequent satellite observations to spatially and temporally complement and expand these observations. We explored all available overpasses (~3250) of the Ocean and Land Colour Instrument (OLCI) on Sentinel-3 within the ice-free periods (May – October) for four years (2018 to 2021) to develop a new retrieval scheme to derive concentrations of DOC. OLCI observations with a spatial resolution of ~300 m were corrected for atmospheric effects using the Polymer algorithm. The results of this study show that using this new retrieval, remotely sensed DOC concentrations agree well with in situ DOC concentrations (MAPD=10.89%, RMSE=1.55 mg L−1, r²=0.92, n=489). The high revisit frequency and wide swath of OLCI allow it to capture the entire range of DOC concentrations and their seasonal variability. Estimated satellite-derived DOC export fluxes integrated over the ice-free periods of 2018 to 2021 show a high interannual variability and agree well with flux estimates from in situ data (RMSD=0.186 Tg C, MAPD=4.05%). In addition, 10-day OLCI composites covering the entire Lena River catchment revealed increasing DOC concentration and local sources of DOC along the Lena from south to north. We conclude that moderate resolution satellite imagers such as OLCI are very capable of observing DOC concentrations in large/wide rivers such as the Lena River ... |
format |
Article in Journal/Newspaper |
author |
El Kassar, Jan Juhls, Bennet Hieronymi, Martin Preusker, Rene Morgenstern, Anne Fischer, Jürgen Overduin, Pier Paul |
spellingShingle |
El Kassar, Jan Juhls, Bennet Hieronymi, Martin Preusker, Rene Morgenstern, Anne Fischer, Jürgen Overduin, Pier Paul Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
author_facet |
El Kassar, Jan Juhls, Bennet Hieronymi, Martin Preusker, Rene Morgenstern, Anne Fischer, Jürgen Overduin, Pier Paul |
author_sort |
El Kassar, Jan |
title |
Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
title_short |
Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
title_full |
Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
title_fullStr |
Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
title_full_unstemmed |
Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia |
title_sort |
optical remote sensing (sentinel-3 olci) used to monitor dissolved organic carbon in the lena river, russia |
publisher |
Frontiers Media SA |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/57677/ https://epic.awi.de/id/eprint/57677/1/ElKassar_et-al_2023_FrontiersMarRes.pdf https://hdl.handle.net/10013/epic.cb9b8224-266a-4e04-932d-e219256e1d2a |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice lena river permafrost Siberia |
genre_facet |
Arctic Arctic Ocean Ice lena river permafrost Siberia |
op_source |
EPIC3Frontiers in Marine Science, Frontiers Media SA, 10, pp. 1082109-1082109, ISSN: 2296-7745 |
op_relation |
https://epic.awi.de/id/eprint/57677/1/ElKassar_et-al_2023_FrontiersMarRes.pdf El Kassar, J. , Juhls, B. , Hieronymi, M. , Preusker, R. , Morgenstern, A. , Fischer, J. and Overduin, P. P. (2023) Optical remote sensing (Sentinel-3 OLCI) used to monitor dissolved organic carbon in the Lena River, Russia , Frontiers in Marine Science, 10 , p. 1082109 . doi:10.3389/fmars.2023.1082109 <https://doi.org/10.3389/fmars.2023.1082109> , hdl:10013/epic.cb9b8224-266a-4e04-932d-e219256e1d2a |
op_doi |
https://doi.org/10.3389/fmars.2023.1082109 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
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1809763411147358208 |