Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations
Detailed predictions of the downward particulate organic carbon (POC) flux in a future Arctic are challenging due to the poor understanding of potential drivers. Short-term sediment traps, partly modified with gel-containing jars, were deployed in the Barents Sea (BS) and in Adventfjorden, Svalbard,...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
UiT The Arctic University of Norway
2015
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/8293 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/8293 |
---|---|
record_format |
openpolar |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/8293 2023-05-15T13:05:52+02:00 Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations Wiedmann, Ingrid 2015-11-13 https://hdl.handle.net/10037/8293 eng eng UiT The Arctic University of Norway UiT Norges arktiske universitet 978-82-8266-107-2 https://hdl.handle.net/10037/8293 URN:NBN:no-uit_munin_7875 openAccess Copyright 2015 The Author(s) VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 DOKTOR-002 Doctoral thesis Doktorgradsavhandling 2015 ftunivtroemsoe 2021-06-25T17:54:27Z Detailed predictions of the downward particulate organic carbon (POC) flux in a future Arctic are challenging due to the poor understanding of potential drivers. Short-term sediment traps, partly modified with gel-containing jars, were deployed in the Barents Sea (BS) and in Adventfjorden, Svalbard, to determine the downward POC flux and the particle flux (≥ 0.05 mm equivalent spherical diameter ESDimage) in a parallel manner. In this way, the quality of the sinking material could be linked to the downward POC flux and this link gave new insights into potential drivers of the carbon flux. In the Barents Sea, the highest downward POC flux (260-670 mg POC m^-2 d^-1) occurred in ice-free, deeply mixed waters. Sinking particles were < 1.00 mm ESDimage and had a high POC: volume ratio. Pulsed nitrate injections from deeper layers most likely stimulated new production, and the downward flux was enhanced by vertical mixing and “biomass repackaging” into fast-sinking pellets by zooplankton. In Adventfjorden, the highest POC flux (770-1530 mg POC m^-2 d^-1) occurred during autumn, coinciding with glacial run-off. Large, fast-sinking particles (0.05-3.62 mm ESDimage) apparently enhanced the downward POC, despite their low POC: volume ratio. In addition, entrained terrestrial POC enhanced the downward POC flux. Ballasting effects by entrained lithogenic material, flocculation and aggregate formation by pteropods are likely, but need further investigation. The present study illustrates that a high downward POC flux in Arctic marine ecosystems may occur during the phytoplankton bloom, but the highest POC downward fluxes found in the BS and Adventfjorden were found in deep-mixed waters during a post bloom situation or during an autumn situation influenced by glacial run-off, respectively. It is also shown, that a high POC downward flux may not only be caused by large particles, but also by small particles with a high POC: volume ratio. Doctoral or Postdoctoral Thesis Adventfjorden Arctic Barents Sea Phytoplankton Svalbard Zooplankton University of Tromsø: Munin Open Research Archive Adventfjorden ENVELOPE(15.515,15.515,78.258,78.258) Arctic Barents Sea Svalbard |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 DOKTOR-002 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 DOKTOR-002 Wiedmann, Ingrid Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 DOKTOR-002 |
description |
Detailed predictions of the downward particulate organic carbon (POC) flux in a future Arctic are challenging due to the poor understanding of potential drivers. Short-term sediment traps, partly modified with gel-containing jars, were deployed in the Barents Sea (BS) and in Adventfjorden, Svalbard, to determine the downward POC flux and the particle flux (≥ 0.05 mm equivalent spherical diameter ESDimage) in a parallel manner. In this way, the quality of the sinking material could be linked to the downward POC flux and this link gave new insights into potential drivers of the carbon flux. In the Barents Sea, the highest downward POC flux (260-670 mg POC m^-2 d^-1) occurred in ice-free, deeply mixed waters. Sinking particles were < 1.00 mm ESDimage and had a high POC: volume ratio. Pulsed nitrate injections from deeper layers most likely stimulated new production, and the downward flux was enhanced by vertical mixing and “biomass repackaging” into fast-sinking pellets by zooplankton. In Adventfjorden, the highest POC flux (770-1530 mg POC m^-2 d^-1) occurred during autumn, coinciding with glacial run-off. Large, fast-sinking particles (0.05-3.62 mm ESDimage) apparently enhanced the downward POC, despite their low POC: volume ratio. In addition, entrained terrestrial POC enhanced the downward POC flux. Ballasting effects by entrained lithogenic material, flocculation and aggregate formation by pteropods are likely, but need further investigation. The present study illustrates that a high downward POC flux in Arctic marine ecosystems may occur during the phytoplankton bloom, but the highest POC downward fluxes found in the BS and Adventfjorden were found in deep-mixed waters during a post bloom situation or during an autumn situation influenced by glacial run-off, respectively. It is also shown, that a high POC downward flux may not only be caused by large particles, but also by small particles with a high POC: volume ratio. |
format |
Doctoral or Postdoctoral Thesis |
author |
Wiedmann, Ingrid |
author_facet |
Wiedmann, Ingrid |
author_sort |
Wiedmann, Ingrid |
title |
Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
title_short |
Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
title_full |
Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
title_fullStr |
Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
title_full_unstemmed |
Potential drivers of the downward carbon and particle flux in Arctic marine ecosystems under contrasting hydrographical and ecological situations |
title_sort |
potential drivers of the downward carbon and particle flux in arctic marine ecosystems under contrasting hydrographical and ecological situations |
publisher |
UiT The Arctic University of Norway |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8293 |
long_lat |
ENVELOPE(15.515,15.515,78.258,78.258) |
geographic |
Adventfjorden Arctic Barents Sea Svalbard |
geographic_facet |
Adventfjorden Arctic Barents Sea Svalbard |
genre |
Adventfjorden Arctic Barents Sea Phytoplankton Svalbard Zooplankton |
genre_facet |
Adventfjorden Arctic Barents Sea Phytoplankton Svalbard Zooplankton |
op_relation |
978-82-8266-107-2 https://hdl.handle.net/10037/8293 URN:NBN:no-uit_munin_7875 |
op_rights |
openAccess Copyright 2015 The Author(s) |
_version_ |
1766396045934198784 |