Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea.
With near-complete replacement of Arctic multi-year ice (MYI) by first-year ice (FYI) predicted to occur within this century, it remains uncertain how the loss of MYI will impact the abundance and distribution of sea ice associated algae. In this study we compare the chlorophyll a (chl a) concentrat...
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ftdoajarticles:oai:doaj.org/article:c11938a2039845948e45e32339189848 2023-05-15T14:56:56+02:00 Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. Benjamin A Lange Christine Michel Justin F Beckers J Alec Casey Hauke Flores Ido Hatam Guillaume Meisterhans Andrea Niemi Christian Haas 2015-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0122418 https://doaj.org/article/c11938a2039845948e45e32339189848 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0122418 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0122418 https://doaj.org/article/c11938a2039845948e45e32339189848 PLoS ONE, Vol 10, Iss 4, p e0122418 (2015) Medicine R Science Q article 2015 ftdoajarticles https://doi.org/10.1371/journal.pone.0122418 2022-12-31T10:35:55Z With near-complete replacement of Arctic multi-year ice (MYI) by first-year ice (FYI) predicted to occur within this century, it remains uncertain how the loss of MYI will impact the abundance and distribution of sea ice associated algae. In this study we compare the chlorophyll a (chl a) concentrations and physical properties of MYI and FYI from the Lincoln Sea during 3 spring seasons (2010-2012). Cores were analysed for texture, salinity, and chl a. We identified annual growth layers for 7 of 11 MYI cores and found no significant differences in chl a concentration between the bottom first-year-ice portions of MYI, upper old-ice portions of MYI, and FYI cores. Overall, the maximum chl a concentrations were observed at the bottom of young FYI. However, there were no significant differences in chl a concentrations between MYI and FYI. This suggests little or no change in algal biomass with a shift from MYI to FYI and that the spatial extent and regional variability of refrozen leads and younger FYI will likely be key factors governing future changes in Arctic sea ice algal biomass. Bottom-integrated chl a concentrations showed negative logistic relationships with snow depth and bulk (snow plus ice) integrated extinction coefficients; indicating a strong influence of snow cover in controlling bottom ice algal biomass. The maximum bottom MYI chl a concentration was observed in a hummock, representing the thickest ice with lowest snow depth of this study. Hence, in this and other studies MYI chl a biomass may be under-estimated due to an under-representation of thick MYI (e.g., hummocks), which typically have a relatively thin snowpack allowing for increased light transmission. Therefore, we suggest the on-going loss of MYI in the Arctic Ocean may have a larger impact on ice-associated production than generally assumed. Article in Journal/Newspaper Arctic Arctic Ocean Lincoln Sea Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean PLOS ONE 10 4 e0122418 |
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language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Benjamin A Lange Christine Michel Justin F Beckers J Alec Casey Hauke Flores Ido Hatam Guillaume Meisterhans Andrea Niemi Christian Haas Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
topic_facet |
Medicine R Science Q |
description |
With near-complete replacement of Arctic multi-year ice (MYI) by first-year ice (FYI) predicted to occur within this century, it remains uncertain how the loss of MYI will impact the abundance and distribution of sea ice associated algae. In this study we compare the chlorophyll a (chl a) concentrations and physical properties of MYI and FYI from the Lincoln Sea during 3 spring seasons (2010-2012). Cores were analysed for texture, salinity, and chl a. We identified annual growth layers for 7 of 11 MYI cores and found no significant differences in chl a concentration between the bottom first-year-ice portions of MYI, upper old-ice portions of MYI, and FYI cores. Overall, the maximum chl a concentrations were observed at the bottom of young FYI. However, there were no significant differences in chl a concentrations between MYI and FYI. This suggests little or no change in algal biomass with a shift from MYI to FYI and that the spatial extent and regional variability of refrozen leads and younger FYI will likely be key factors governing future changes in Arctic sea ice algal biomass. Bottom-integrated chl a concentrations showed negative logistic relationships with snow depth and bulk (snow plus ice) integrated extinction coefficients; indicating a strong influence of snow cover in controlling bottom ice algal biomass. The maximum bottom MYI chl a concentration was observed in a hummock, representing the thickest ice with lowest snow depth of this study. Hence, in this and other studies MYI chl a biomass may be under-estimated due to an under-representation of thick MYI (e.g., hummocks), which typically have a relatively thin snowpack allowing for increased light transmission. Therefore, we suggest the on-going loss of MYI in the Arctic Ocean may have a larger impact on ice-associated production than generally assumed. |
format |
Article in Journal/Newspaper |
author |
Benjamin A Lange Christine Michel Justin F Beckers J Alec Casey Hauke Flores Ido Hatam Guillaume Meisterhans Andrea Niemi Christian Haas |
author_facet |
Benjamin A Lange Christine Michel Justin F Beckers J Alec Casey Hauke Flores Ido Hatam Guillaume Meisterhans Andrea Niemi Christian Haas |
author_sort |
Benjamin A Lange |
title |
Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
title_short |
Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
title_full |
Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
title_fullStr |
Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
title_full_unstemmed |
Comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the Lincoln Sea. |
title_sort |
comparing springtime ice-algal chlorophyll a and physical properties of multi-year and first-year sea ice from the lincoln sea. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0122418 https://doaj.org/article/c11938a2039845948e45e32339189848 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Lincoln Sea Sea ice |
genre_facet |
Arctic Arctic Ocean Lincoln Sea Sea ice |
op_source |
PLoS ONE, Vol 10, Iss 4, p e0122418 (2015) |
op_relation |
https://doi.org/10.1371/journal.pone.0122418 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0122418 https://doaj.org/article/c11938a2039845948e45e32339189848 |
op_doi |
https://doi.org/10.1371/journal.pone.0122418 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
4 |
container_start_page |
e0122418 |
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1766328995750608896 |