Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter
The Arctic Ocean plays an important role on the global hydrological and carbon cycles. It contributes 5a 14% to the global balance of CO2 sinks and sources. Carbon is also cycled in the Arctic Ocean through the primary producers, with high primary production observed in the marginal ice zones, ice-f...
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Universität Bremen
2016
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/1184 https://nbn-resolving.org/urn:nbn:de:gbv:46-00105737-16 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1184 2023-05-15T14:29:22+02:00 Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter Nachweis der Umweltvariabilität im sich ändernden Arktischen Ozean mit optischen Messungen der gelösten organischen Substanz Gonçalves Araujo, Rafael Bracher, Astrid Stedmon, Colin, Associate 2016-12-08 application/pdf https://media.suub.uni-bremen.de/handle/elib/1184 https://nbn-resolving.org/urn:nbn:de:gbv:46-00105737-16 eng eng Universität Bremen FB2 Biologie/Chemie https://media.suub.uni-bremen.de/handle/elib/1184 urn:nbn:de:gbv:46-00105737-16 info:eu-repo/semantics/openAccess dissolved organic matter Arctic Ocean oceanography bio-optics remote sensing 500 500 Science ddc:500 Dissertation doctoralThesis 2016 ftsubbremen 2022-11-09T07:09:31Z The Arctic Ocean plays an important role on the global hydrological and carbon cycles. It contributes 5a 14% to the global balance of CO2 sinks and sources. Carbon is also cycled in the Arctic Ocean through the primary producers, with high primary production observed in the marginal ice zones, ice-free zones and melt ponds, with increased biogenic carbon export to the deep layers. Although being the smallest ocean basin, the Arctic Ocean receives 11% of the global riverine runoff. Along with the freshwater, high loads of organic carbon are introduced in the Arctic Ocean. Most of it is observed in the fraction of dissolved organic matter (DOM). With the ongoing global warming, glacier melt and permafrost thaw are observed and pointed as the main drivers for increasing the freshwater discharge into the Arctic basin. Along side, permafrost thaw coupled with increased coastal erosion lead to an increase in mobilization of carbon from permafrost, which could have critical implications for microbial processes, primary production, terrestrial carbon fluxes to the shelf seas and, thus, carbon cycling in the Arctic. This thesis is focusing on tracing the mixing of DOM along the Siberian shelves and developing potential applications of DOM as an environmental tracer. Four main objectives have been pursed: (1) to quantify, characterize and assess the distribution and transformation of DOM across the river-shelf transition and provide insights into the fate of Arctic riverine DOM; (2) to assess the potential of DOM, especially its fluorescent fraction (FDOM), as a tracer of freshwater in the surface layers in the Arctic Ocean; (3) to characterize the non-water absorption in the surface central and eastern Arctic Ocean and further test whether bio-optical properties (such as absorption and reflectance) can reproduce hydrographical variability; (4) to evaluate the performance of ocean color algorithms frequently applied for studies in the Arctic Ocean using novel data from a central-eastern Arctic expedition. Doctoral or Postdoctoral Thesis Arctic Basin Arctic Arctic Ocean Arktis* Global warming Ice permafrost Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
dissolved organic matter Arctic Ocean oceanography bio-optics remote sensing 500 500 Science ddc:500 |
spellingShingle |
dissolved organic matter Arctic Ocean oceanography bio-optics remote sensing 500 500 Science ddc:500 Gonçalves Araujo, Rafael Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
topic_facet |
dissolved organic matter Arctic Ocean oceanography bio-optics remote sensing 500 500 Science ddc:500 |
description |
The Arctic Ocean plays an important role on the global hydrological and carbon cycles. It contributes 5a 14% to the global balance of CO2 sinks and sources. Carbon is also cycled in the Arctic Ocean through the primary producers, with high primary production observed in the marginal ice zones, ice-free zones and melt ponds, with increased biogenic carbon export to the deep layers. Although being the smallest ocean basin, the Arctic Ocean receives 11% of the global riverine runoff. Along with the freshwater, high loads of organic carbon are introduced in the Arctic Ocean. Most of it is observed in the fraction of dissolved organic matter (DOM). With the ongoing global warming, glacier melt and permafrost thaw are observed and pointed as the main drivers for increasing the freshwater discharge into the Arctic basin. Along side, permafrost thaw coupled with increased coastal erosion lead to an increase in mobilization of carbon from permafrost, which could have critical implications for microbial processes, primary production, terrestrial carbon fluxes to the shelf seas and, thus, carbon cycling in the Arctic. This thesis is focusing on tracing the mixing of DOM along the Siberian shelves and developing potential applications of DOM as an environmental tracer. Four main objectives have been pursed: (1) to quantify, characterize and assess the distribution and transformation of DOM across the river-shelf transition and provide insights into the fate of Arctic riverine DOM; (2) to assess the potential of DOM, especially its fluorescent fraction (FDOM), as a tracer of freshwater in the surface layers in the Arctic Ocean; (3) to characterize the non-water absorption in the surface central and eastern Arctic Ocean and further test whether bio-optical properties (such as absorption and reflectance) can reproduce hydrographical variability; (4) to evaluate the performance of ocean color algorithms frequently applied for studies in the Arctic Ocean using novel data from a central-eastern Arctic expedition. |
author2 |
Bracher, Astrid Stedmon, Colin, Associate |
format |
Doctoral or Postdoctoral Thesis |
author |
Gonçalves Araujo, Rafael |
author_facet |
Gonçalves Araujo, Rafael |
author_sort |
Gonçalves Araujo, Rafael |
title |
Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
title_short |
Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
title_full |
Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
title_fullStr |
Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
title_full_unstemmed |
Tracing environmental variability in the changing Arctic Ocean with optical measurements of dissolved organic matter |
title_sort |
tracing environmental variability in the changing arctic ocean with optical measurements of dissolved organic matter |
publisher |
Universität Bremen |
publishDate |
2016 |
url |
https://media.suub.uni-bremen.de/handle/elib/1184 https://nbn-resolving.org/urn:nbn:de:gbv:46-00105737-16 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Basin Arctic Arctic Ocean Arktis* Global warming Ice permafrost |
genre_facet |
Arctic Basin Arctic Arctic Ocean Arktis* Global warming Ice permafrost |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1184 urn:nbn:de:gbv:46-00105737-16 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766303394113257472 |