Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color 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...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
EGU - Copernicus Publication
2019
|
Subjects: | |
Online Access: | https://publications.hereon.de/id/36900 https://publications.hzg.de/id/36900 https://www.biogeosciences-discuss.net/bg-2019-70/bg-2019-70.pdf |
id |
fthzgzmk:oai:publications.hereon.de:36900 |
---|---|
record_format |
openpolar |
spelling |
fthzgzmk:oai:publications.hereon.de:36900 2023-05-15T15:03:36+02:00 Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color Remote Sensing Juhls, B. Overduin, P.P. Hoelemann, J. Hieronymi, M. Matsuoka, A. Heim, B. Fischer, J. 2019 https://publications.hereon.de/id/36900 https://publications.hzg.de/id/36900 https://www.biogeosciences-discuss.net/bg-2019-70/bg-2019-70.pdf en eng EGU - Copernicus Publication https://dx.doi.org/10.5194/bg-2019-70 urn:issn:1810-6285 https://publications.hereon.de/id/36900 https://publications.hzg.de/id/36900 https://www.biogeosciences-discuss.net/bg-2019-70/bg-2019-70.pdf info:eu-repo/semantics/openAccess open_access oa_gold issn:1810-6285 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 Color Remote Sensing. In: Biogeosciences Discussions [Online Ressource]. (2019) 70. (DOI: /10.5194/bg-2019-70) info:eu-repo/semantics/article Zeitschrift Artikel 2019 fthzgzmk https://doi.org/10.5194/bg-2019-70 2022-12-07T07:03:06Z 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 |
institution |
Open Polar |
collection |
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 Color 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 Color Remote Sensing |
title_short |
Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color Remote Sensing |
title_full |
Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color Remote Sensing |
title_fullStr |
Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color Remote Sensing |
title_full_unstemmed |
Dissolved Organic Matter at the Fluvial-Marine Transition in the Laptev Sea Using in situ Data and Ocean Color Remote Sensing |
title_sort |
dissolved organic matter at the fluvial-marine transition in the laptev sea using in situ data and ocean color remote sensing |
publisher |
EGU - Copernicus Publication |
publishDate |
2019 |
url |
https://publications.hereon.de/id/36900 https://publications.hzg.de/id/36900 https://www.biogeosciences-discuss.net/bg-2019-70/bg-2019-70.pdf |
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:1810-6285 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 Color Remote Sensing. In: Biogeosciences Discussions [Online Ressource]. (2019) 70. (DOI: /10.5194/bg-2019-70) |
op_relation |
https://dx.doi.org/10.5194/bg-2019-70 urn:issn:1810-6285 https://publications.hereon.de/id/36900 https://publications.hzg.de/id/36900 https://www.biogeosciences-discuss.net/bg-2019-70/bg-2019-70.pdf |
op_rights |
info:eu-repo/semantics/openAccess open_access oa_gold |
op_doi |
https://doi.org/10.5194/bg-2019-70 |
_version_ |
1766335460356915200 |