Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf
Meltwater discharge from tidewater glaciers impacts the adjacent marine environment. Due to the global warming, tidewater glaciers are retreating and will eventually terminate on land. Yet, the mechanisms through which meltwater runoff and subglacial discharge from tidewater glaciers influence marin...
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ftfrontimediafig:oai:figshare.com:article/8209016 2023-05-15T16:22:13+02:00 Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf Laura Halbach Mikko Vihtakari Pedro Duarte Alistair Everett Mats A. Granskog Haakon Hop Hanna M. Kauko Svein Kristiansen Per I. Myhre Alexey K. Pavlov Ankit Pramanik Agnieszka Tatarek Tomas Torsvik Józef M. Wiktor Anette Wold Angela Wulff Harald Steen Philipp Assmy 2019-05-31T11:36:10Z https://doi.org/10.3389/fmars.2019.00254.s001 https://figshare.com/articles/Presentation_1_Tidewater_Glaciers_and_Bedrock_Characteristics_Control_the_Phytoplankton_Growth_Environment_in_a_Fjord_in_the_Arctic_pdf/8209016 unknown doi:10.3389/fmars.2019.00254.s001 https://figshare.com/articles/Presentation_1_Tidewater_Glaciers_and_Bedrock_Characteristics_Control_the_Phytoplankton_Growth_Environment_in_a_Fjord_in_the_Arctic_pdf/8209016 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering sediment geology light ammonium glacial meltwater nutrients Svalbard Kongsfjorden Text Presentation 2019 ftfrontimediafig https://doi.org/10.3389/fmars.2019.00254.s001 2019-06-05T22:59:02Z Meltwater discharge from tidewater glaciers impacts the adjacent marine environment. Due to the global warming, tidewater glaciers are retreating and will eventually terminate on land. Yet, the mechanisms through which meltwater runoff and subglacial discharge from tidewater glaciers influence marine primary production remain poorly understood, as data in close proximity to glacier fronts are scarce. Here, we show that subglacial meltwater discharge and bedrock characteristics of the catchments control the phytoplankton growth environment inside the fjord, based on data collected in close proximity to tidewater glacier fronts in Kongsfjorden, Svalbard from 26 to 31 July 2017. In the southern part of the inner fjord, glacial meltwater from subglacial discharge was rich in fine sediments derived from erosion of Devonian Old Red Sandstone and carbonate rock deposits, limiting light availability for phytoplankton (0.6 mg m −3 Chl a on average, range 0.2–1.9 mg m −3 ). In contrast, coarser sediments derived from gneiss and granite bedrock and lower subglacial discharge rates were associated with more favourable light conditions facilitating a local phytoplankton bloom in the northern part of the inner fjord with mean Chl a concentration of 2.8 mg m −3 (range 1.3–7.4 mg m −3 ). In the northern part, glacier meltwater was a direct source of silicic acid through weathering of the silica-rich gneiss and granite bedrock. Upwelling of the subglacial freshwater discharge plume at the Kronebreen glacier front in the southern part entrained large volumes of ambient, nutrient-rich bottom waters which led to elevated surface concentrations of ammonium, nitrate, and partly silicic acid. Total dissolved inorganic nitrogen transported to the surface with the upwelling of the subglacial discharge plume has a significant potential to enhance summer primary production in Kongsfjorden, with ammonium released from the seafloor being of particular importance. The transition from tidewater to land-terminating glaciers may, thus, reduce ... Conference Object glacier Kongsfjord* Kongsfjorden Svalbard Tidewater Frontiers: Figshare Svalbard Kronebreen ENVELOPE(13.333,13.333,78.833,78.833) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering sediment geology light ammonium glacial meltwater nutrients Svalbard Kongsfjorden |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering sediment geology light ammonium glacial meltwater nutrients Svalbard Kongsfjorden Laura Halbach Mikko Vihtakari Pedro Duarte Alistair Everett Mats A. Granskog Haakon Hop Hanna M. Kauko Svein Kristiansen Per I. Myhre Alexey K. Pavlov Ankit Pramanik Agnieszka Tatarek Tomas Torsvik Józef M. Wiktor Anette Wold Angela Wulff Harald Steen Philipp Assmy Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering sediment geology light ammonium glacial meltwater nutrients Svalbard Kongsfjorden |
description |
Meltwater discharge from tidewater glaciers impacts the adjacent marine environment. Due to the global warming, tidewater glaciers are retreating and will eventually terminate on land. Yet, the mechanisms through which meltwater runoff and subglacial discharge from tidewater glaciers influence marine primary production remain poorly understood, as data in close proximity to glacier fronts are scarce. Here, we show that subglacial meltwater discharge and bedrock characteristics of the catchments control the phytoplankton growth environment inside the fjord, based on data collected in close proximity to tidewater glacier fronts in Kongsfjorden, Svalbard from 26 to 31 July 2017. In the southern part of the inner fjord, glacial meltwater from subglacial discharge was rich in fine sediments derived from erosion of Devonian Old Red Sandstone and carbonate rock deposits, limiting light availability for phytoplankton (0.6 mg m −3 Chl a on average, range 0.2–1.9 mg m −3 ). In contrast, coarser sediments derived from gneiss and granite bedrock and lower subglacial discharge rates were associated with more favourable light conditions facilitating a local phytoplankton bloom in the northern part of the inner fjord with mean Chl a concentration of 2.8 mg m −3 (range 1.3–7.4 mg m −3 ). In the northern part, glacier meltwater was a direct source of silicic acid through weathering of the silica-rich gneiss and granite bedrock. Upwelling of the subglacial freshwater discharge plume at the Kronebreen glacier front in the southern part entrained large volumes of ambient, nutrient-rich bottom waters which led to elevated surface concentrations of ammonium, nitrate, and partly silicic acid. Total dissolved inorganic nitrogen transported to the surface with the upwelling of the subglacial discharge plume has a significant potential to enhance summer primary production in Kongsfjorden, with ammonium released from the seafloor being of particular importance. The transition from tidewater to land-terminating glaciers may, thus, reduce ... |
format |
Conference Object |
author |
Laura Halbach Mikko Vihtakari Pedro Duarte Alistair Everett Mats A. Granskog Haakon Hop Hanna M. Kauko Svein Kristiansen Per I. Myhre Alexey K. Pavlov Ankit Pramanik Agnieszka Tatarek Tomas Torsvik Józef M. Wiktor Anette Wold Angela Wulff Harald Steen Philipp Assmy |
author_facet |
Laura Halbach Mikko Vihtakari Pedro Duarte Alistair Everett Mats A. Granskog Haakon Hop Hanna M. Kauko Svein Kristiansen Per I. Myhre Alexey K. Pavlov Ankit Pramanik Agnieszka Tatarek Tomas Torsvik Józef M. Wiktor Anette Wold Angela Wulff Harald Steen Philipp Assmy |
author_sort |
Laura Halbach |
title |
Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
title_short |
Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
title_full |
Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
title_fullStr |
Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
title_full_unstemmed |
Presentation_1_Tidewater Glaciers and Bedrock Characteristics Control the Phytoplankton Growth Environment in a Fjord in the Arctic.pdf |
title_sort |
presentation_1_tidewater glaciers and bedrock characteristics control the phytoplankton growth environment in a fjord in the arctic.pdf |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmars.2019.00254.s001 https://figshare.com/articles/Presentation_1_Tidewater_Glaciers_and_Bedrock_Characteristics_Control_the_Phytoplankton_Growth_Environment_in_a_Fjord_in_the_Arctic_pdf/8209016 |
long_lat |
ENVELOPE(13.333,13.333,78.833,78.833) |
geographic |
Svalbard Kronebreen |
geographic_facet |
Svalbard Kronebreen |
genre |
glacier Kongsfjord* Kongsfjorden Svalbard Tidewater |
genre_facet |
glacier Kongsfjord* Kongsfjorden Svalbard Tidewater |
op_relation |
doi:10.3389/fmars.2019.00254.s001 https://figshare.com/articles/Presentation_1_Tidewater_Glaciers_and_Bedrock_Characteristics_Control_the_Phytoplankton_Growth_Environment_in_a_Fjord_in_the_Arctic_pdf/8209016 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2019.00254.s001 |
_version_ |
1766010181496340480 |