Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing
River water is the main source of dissolved organic carbon (DOC) in the Arctic Ocean. DOC plays an important role in the Arctic carbon cycle and its export from land to sea is expected to increase as ongoing climate change accelerates permafrost thaw. However, transport pathways and transformation o...
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fthzgzmk:oai:publications.hereon.de:37094 2023-06-11T04:09:27+02:00 Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing Juhls, B. Overduin, P.P. Hoelemann, J. Hieronymi, M. Matsuoka, A. Heim, B. Fischer, J. 2019 https://publications.hereon.de/id/37094 https://publications.hzg.de/id/37094 https://doi.org/10.5194/bg-16-2693-2019 en eng EGU - Copernicus Publication https://dx.doi.org/10.5194/bg-16-2693-2019 urn:issn:1726-4170 https://publications.hereon.de/id/37094 https://publications.hzg.de/id/37094 info:eu-repo/semantics/openAccess open_access oa_gold issn:1726-4170 Juhls, B.; Overduin, P.P.; Hoelemann, J.; Hieronymi, M.; Matsuoka, A.; Heim, B.; Fischer, J.: Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing. In: Biogeosciences. Vol. 16 (2019) 13, 2693 - 2713. (DOI: /10.5194/bg-16-2693-2019) info:eu-repo/semantics/article Zeitschrift Artikel 2019 fthzgzmk https://doi.org/10.5194/bg-16-2693-2019 2023-05-28T23:24:51Z River water is the main source of dissolved organic carbon (DOC) in the Arctic Ocean. DOC plays an important role in the Arctic carbon cycle and its export from land to sea is expected to increase as ongoing climate change accelerates permafrost thaw. However, transport pathways and transformation of DOC in the land-to-ocean transition are mostly unknown. We collected DOC and aCDOM(λ) samples from 11 expeditions to river, coastal and offshore waters and present a new DOC-aCDOM(λ) model for the fluvial-marine transition zone in the Laptev Sea The aCDOM(λ) characteristics revealed that the DOM in samples of this dataset are primarily of terrigenous origin. Observed changes in aCDOM and its spectral slopes indicate that DOM is modified by microbial- and photo-degradation. Ocean Color Remote Sensing (OCRS) provides the absorption coefficient of colored dissolved organic matter (aCDOM(λ)sat) at λ = 440 or 443 nm, which can be used to estimate DOC concentration at high temporal and spatial resolution over large regions. We tested the statistical performance of five OCRS algorithms and evaluated the plausibility of the spatial distribution of derived aCDOM(λ)sat. The ONNS algorithm showed the best performance compared to in situ aCDOM(440) (r2 = 0.72). Additionally, we found ONNS-derived aCDOM(440), in contrast to other algorithms, to be partly independent of sediment concentration, making ONNS the most suitable aCDOM(λ)sat algorithm for the Laptev Sea region. The DOC-aCDOM(λ) model was applied to ONNS-derived aCDOM(440) and retrieved DOC concentration maps showed moderate agreement to in situ data (r2 = 0.53). The in situ and satellite-retrieved data were offset by up to several days, which may partly explain the weak correlation for this dynamic region. Satellite-derived surface water DOC concentration maps from MERIS satellite data demonstrate rapid removal of DOC within short time periods in coastal waters of the Laptev Sea, which is likely caused by physical mixing and different types of degradation processes. ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change laptev Laptev Sea permafrost Hereon Publications (Helmholtz-Zentrum) Arctic Arctic Ocean Laptev Sea Biogeosciences 16 13 2693 2713 |
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Open Polar |
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Hereon Publications (Helmholtz-Zentrum) |
op_collection_id |
fthzgzmk |
language |
English |
description |
River water is the main source of dissolved organic carbon (DOC) in the Arctic Ocean. DOC plays an important role in the Arctic carbon cycle and its export from land to sea is expected to increase as ongoing climate change accelerates permafrost thaw. However, transport pathways and transformation of DOC in the land-to-ocean transition are mostly unknown. We collected DOC and aCDOM(λ) samples from 11 expeditions to river, coastal and offshore waters and present a new DOC-aCDOM(λ) model for the fluvial-marine transition zone in the Laptev Sea The aCDOM(λ) characteristics revealed that the DOM in samples of this dataset are primarily of terrigenous origin. Observed changes in aCDOM and its spectral slopes indicate that DOM is modified by microbial- and photo-degradation. Ocean Color Remote Sensing (OCRS) provides the absorption coefficient of colored dissolved organic matter (aCDOM(λ)sat) at λ = 440 or 443 nm, which can be used to estimate DOC concentration at high temporal and spatial resolution over large regions. We tested the statistical performance of five OCRS algorithms and evaluated the plausibility of the spatial distribution of derived aCDOM(λ)sat. The ONNS algorithm showed the best performance compared to in situ aCDOM(440) (r2 = 0.72). Additionally, we found ONNS-derived aCDOM(440), in contrast to other algorithms, to be partly independent of sediment concentration, making ONNS the most suitable aCDOM(λ)sat algorithm for the Laptev Sea region. The DOC-aCDOM(λ) model was applied to ONNS-derived aCDOM(440) and retrieved DOC concentration maps showed moderate agreement to in situ data (r2 = 0.53). The in situ and satellite-retrieved data were offset by up to several days, which may partly explain the weak correlation for this dynamic region. Satellite-derived surface water DOC concentration maps from MERIS satellite data demonstrate rapid removal of DOC within short time periods in coastal waters of the Laptev Sea, which is likely caused by physical mixing and different types of degradation processes. ... |
format |
Article in Journal/Newspaper |
author |
Juhls, B. Overduin, P.P. Hoelemann, J. Hieronymi, M. Matsuoka, A. Heim, B. Fischer, J. |
spellingShingle |
Juhls, B. Overduin, P.P. Hoelemann, J. Hieronymi, M. Matsuoka, A. Heim, B. Fischer, J. Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
author_facet |
Juhls, B. Overduin, P.P. Hoelemann, J. Hieronymi, M. Matsuoka, A. Heim, B. Fischer, J. |
author_sort |
Juhls, B. |
title |
Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
title_short |
Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
title_full |
Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
title_fullStr |
Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
title_full_unstemmed |
Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing |
title_sort |
dissolved organic matter at the fluvial–marine transition in the laptev sea using in situ data and ocean colour remote sensing |
publisher |
EGU - Copernicus Publication |
publishDate |
2019 |
url |
https://publications.hereon.de/id/37094 https://publications.hzg.de/id/37094 https://doi.org/10.5194/bg-16-2693-2019 |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Ocean Climate change laptev Laptev Sea permafrost |
genre_facet |
Arctic Arctic Ocean Climate change laptev Laptev Sea permafrost |
op_source |
issn:1726-4170 Juhls, B.; Overduin, P.P.; Hoelemann, J.; Hieronymi, M.; Matsuoka, A.; Heim, B.; Fischer, J.: Dissolved organic matter at the fluvial–marine transition in the Laptev Sea using in situ data and ocean colour remote sensing. In: Biogeosciences. Vol. 16 (2019) 13, 2693 - 2713. (DOI: /10.5194/bg-16-2693-2019) |
op_relation |
https://dx.doi.org/10.5194/bg-16-2693-2019 urn:issn:1726-4170 https://publications.hereon.de/id/37094 https://publications.hzg.de/id/37094 |
op_rights |
info:eu-repo/semantics/openAccess open_access oa_gold |
op_doi |
https://doi.org/10.5194/bg-16-2693-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
13 |
container_start_page |
2693 |
op_container_end_page |
2713 |
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1768383325671522304 |