Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway
The seasonal development of sea ice algae and bacteria was investigated in Ramfjorden, Norway, from February to April 2019 and compared to data from two Arctic fjords, Van Mijenfjorden and Billefjorden, sampled in April 2019. The sea ice in Ramfjorden was heavily freshwater influenced with bulk sali...
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UiT Norges arktiske universitet
2020
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ftunivtroemsoe:oai:munin.uit.no:10037/21284 2023-05-15T14:50:07+02:00 Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway Persson, Emma 2020-05-29 https://hdl.handle.net/10037/21284 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/21284 openAccess Copyright 2020 The Author(s) VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 Master thesis Mastergradsoppgave 2020 ftunivtroemsoe 2021-06-25T17:58:12Z The seasonal development of sea ice algae and bacteria was investigated in Ramfjorden, Norway, from February to April 2019 and compared to data from two Arctic fjords, Van Mijenfjorden and Billefjorden, sampled in April 2019. The sea ice in Ramfjorden was heavily freshwater influenced with bulk salinities ranging from 0.0 to 2.8, similar to those found in freshwater influenced Baltic Sea ice. The low bulk salinities and low brine volume fractions in combination with warm temperatures and low brine salinities resulted in a distinctly different Ramfjorden sea ice environment compared to typical marine high Arctic sea ice systems. One station in Billefjorden, located at the front of a tidewater glacier, was however similar to the sea ice environment in Ramfjorden which indicates that the freshwater input from the glacier had similar effects on the sea ice environment. Ramfjorden had a high snow depth of 10.5 to 52.5 cm during most of the time resulting in reduced light availability for algal growth. The abiotic variables combined resulted in low algal and bacterial abundances, that generally stayed two or more orders of magnitude below those from Arctic sea ice in spring. The algal community in Ramfjorden showed a seasonal succession from almost complete dominance of flagellates at the start of the ice season in February to a higher abundance of diatoms dominated by the centric diatom Leptocylindrus minimus. This succession was dependent on the age of the ice and in-ice algal growth and not defined through interactions with the phytoplankton community. Ramfjorden could in future studies be used as a model system to analyse the influence of freshwater run-off on sea ice systems and if its change will have a larger impact on high Arctic systems in the future. Master Thesis Arctic Billefjorden glacier ice algae Northern Norway Phytoplankton Sea ice Tidewater Van Mijenfjorden University of Tromsø: Munin Open Research Archive Arctic Norway Billefjorden ENVELOPE(16.417,16.417,78.563,78.563) Van Mijenfjorden ENVELOPE(14.667,14.667,77.717,77.717) Ramfjorden ENVELOPE(19.062,19.062,69.545,69.545) |
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 BIO-3950 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 Persson, Emma Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 |
description |
The seasonal development of sea ice algae and bacteria was investigated in Ramfjorden, Norway, from February to April 2019 and compared to data from two Arctic fjords, Van Mijenfjorden and Billefjorden, sampled in April 2019. The sea ice in Ramfjorden was heavily freshwater influenced with bulk salinities ranging from 0.0 to 2.8, similar to those found in freshwater influenced Baltic Sea ice. The low bulk salinities and low brine volume fractions in combination with warm temperatures and low brine salinities resulted in a distinctly different Ramfjorden sea ice environment compared to typical marine high Arctic sea ice systems. One station in Billefjorden, located at the front of a tidewater glacier, was however similar to the sea ice environment in Ramfjorden which indicates that the freshwater input from the glacier had similar effects on the sea ice environment. Ramfjorden had a high snow depth of 10.5 to 52.5 cm during most of the time resulting in reduced light availability for algal growth. The abiotic variables combined resulted in low algal and bacterial abundances, that generally stayed two or more orders of magnitude below those from Arctic sea ice in spring. The algal community in Ramfjorden showed a seasonal succession from almost complete dominance of flagellates at the start of the ice season in February to a higher abundance of diatoms dominated by the centric diatom Leptocylindrus minimus. This succession was dependent on the age of the ice and in-ice algal growth and not defined through interactions with the phytoplankton community. Ramfjorden could in future studies be used as a model system to analyse the influence of freshwater run-off on sea ice systems and if its change will have a larger impact on high Arctic systems in the future. |
format |
Master Thesis |
author |
Persson, Emma |
author_facet |
Persson, Emma |
author_sort |
Persson, Emma |
title |
Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
title_short |
Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
title_full |
Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
title_fullStr |
Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
title_full_unstemmed |
Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway |
title_sort |
spring sea ice algal development in the sub-arctic ramfjorden, northern norway |
publisher |
UiT Norges arktiske universitet |
publishDate |
2020 |
url |
https://hdl.handle.net/10037/21284 |
long_lat |
ENVELOPE(16.417,16.417,78.563,78.563) ENVELOPE(14.667,14.667,77.717,77.717) ENVELOPE(19.062,19.062,69.545,69.545) |
geographic |
Arctic Norway Billefjorden Van Mijenfjorden Ramfjorden |
geographic_facet |
Arctic Norway Billefjorden Van Mijenfjorden Ramfjorden |
genre |
Arctic Billefjorden glacier ice algae Northern Norway Phytoplankton Sea ice Tidewater Van Mijenfjorden |
genre_facet |
Arctic Billefjorden glacier ice algae Northern Norway Phytoplankton Sea ice Tidewater Van Mijenfjorden |
op_relation |
https://hdl.handle.net/10037/21284 |
op_rights |
openAccess Copyright 2020 The Author(s) |
_version_ |
1766321188593729536 |