Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground
Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.927955 2023-05-15T14:26:50+02:00 Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground Hanz, Ulrike LATITUDE: 73.816000 * LONGITUDE: 7.523468 * DATE/TIME START: 2016-07-10T00:00:00 * DATE/TIME END: 2017-06-05T00:00:00 * MINIMUM ELEVATION: -669.0 m * MAXIMUM ELEVATION: -663.0 m 2021-02-15 text/tab-separated-values, 204 data points https://doi.pangaea.de/10.1594/PANGAEA.927955 https://doi.org/10.1594/PANGAEA.927955 en eng PANGAEA Hanz, Ulrike; Roberts, Emyr Martyn; Duineveld, Gerard C A; Davies, Andrew; van Haren, Hans; Rapp, Hans Tore; Reichart, Gert-Jan; Mienis, Furu (accepted): Long‐term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep‐Sea Sponge Ground. Journal of Geophysical Research: Oceans, 126(3), https://doi.org/10.1029/2020JC016776 https://doi.pangaea.de/10.1594/PANGAEA.927955 https://doi.org/10.1594/PANGAEA.927955 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY B_LANDER Bottom lander Carbon flux flux per year organic total Carbon/Nitrogen ratio DATE/TIME Deep-sea Sponge Grounds Ecosystems of the North Atlantic G. O. Sars (2003) GS16A-202 GS2016109A GS2016109A-07-LAN-01 GS2017110 GS2017110-17-LAN-04 Nitrogen Sample code/label Schultz Bank SponGES Technicap PPS4/3 Total mass flux per day δ13C δ15N Dataset 2021 ftpangaea https://doi.org/10.1594/PANGAEA.927955 https://doi.org/10.1029/2020JC016776 2023-01-20T09:14:27Z Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along CTD transects and a lander was deployed within the sponge ground that recorded near-bottom physical properties as well as vertical fluxes of organic matter over an annual cycle. The data demonstrate that the sponge ground is found at water temperatures of -0.5 to 1 °C and is situated at the interface between two water masses at only 0.7° equatorward of the turning point latitude of semidiurnal lunar internal tides. Internal waves supported by vertical density stratification interact with the seamount topography and produce turbulent mixing as well as resuspension of organic matter with temporarily very high current speeds up to 0.72 m s-1. The vertical movement of the water column delivers food and nutrients from water layers above and below towards the sponge ground. Highest organic carbon flux was observed during the summer phytoplankton bloom period, providing fresh organic matter from the surface. The flux of fresh organic matter is unlikely to sustain the carbon demand of this ecosystem. Therefore, the availability of bacteria, nutrients and dissolved and particulate matter, delivered by tidally-forced internal wave turbulence and transport by horizontal mean flows, likely plays an important role in meeting ecosystem-level food requirements. Dataset Arctic Arctic North Atlantic Phytoplankton PANGAEA - Data Publisher for Earth & Environmental Science Arctic ENVELOPE(7.523468,7.523468,73.816000,73.816000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
B_LANDER Bottom lander Carbon flux flux per year organic total Carbon/Nitrogen ratio DATE/TIME Deep-sea Sponge Grounds Ecosystems of the North Atlantic G. O. Sars (2003) GS16A-202 GS2016109A GS2016109A-07-LAN-01 GS2017110 GS2017110-17-LAN-04 Nitrogen Sample code/label Schultz Bank SponGES Technicap PPS4/3 Total mass flux per day δ13C δ15N |
spellingShingle |
B_LANDER Bottom lander Carbon flux flux per year organic total Carbon/Nitrogen ratio DATE/TIME Deep-sea Sponge Grounds Ecosystems of the North Atlantic G. O. Sars (2003) GS16A-202 GS2016109A GS2016109A-07-LAN-01 GS2017110 GS2017110-17-LAN-04 Nitrogen Sample code/label Schultz Bank SponGES Technicap PPS4/3 Total mass flux per day δ13C δ15N Hanz, Ulrike Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
topic_facet |
B_LANDER Bottom lander Carbon flux flux per year organic total Carbon/Nitrogen ratio DATE/TIME Deep-sea Sponge Grounds Ecosystems of the North Atlantic G. O. Sars (2003) GS16A-202 GS2016109A GS2016109A-07-LAN-01 GS2017110 GS2017110-17-LAN-04 Nitrogen Sample code/label Schultz Bank SponGES Technicap PPS4/3 Total mass flux per day δ13C δ15N |
description |
Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along CTD transects and a lander was deployed within the sponge ground that recorded near-bottom physical properties as well as vertical fluxes of organic matter over an annual cycle. The data demonstrate that the sponge ground is found at water temperatures of -0.5 to 1 °C and is situated at the interface between two water masses at only 0.7° equatorward of the turning point latitude of semidiurnal lunar internal tides. Internal waves supported by vertical density stratification interact with the seamount topography and produce turbulent mixing as well as resuspension of organic matter with temporarily very high current speeds up to 0.72 m s-1. The vertical movement of the water column delivers food and nutrients from water layers above and below towards the sponge ground. Highest organic carbon flux was observed during the summer phytoplankton bloom period, providing fresh organic matter from the surface. The flux of fresh organic matter is unlikely to sustain the carbon demand of this ecosystem. Therefore, the availability of bacteria, nutrients and dissolved and particulate matter, delivered by tidally-forced internal wave turbulence and transport by horizontal mean flows, likely plays an important role in meeting ecosystem-level food requirements. |
format |
Dataset |
author |
Hanz, Ulrike |
author_facet |
Hanz, Ulrike |
author_sort |
Hanz, Ulrike |
title |
Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
title_short |
Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
title_full |
Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
title_fullStr |
Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
title_full_unstemmed |
Vertical fluxes of organic matter over an annual cycle at an Arctic deep-sea sponge ground |
title_sort |
vertical fluxes of organic matter over an annual cycle at an arctic deep-sea sponge ground |
publisher |
PANGAEA |
publishDate |
2021 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.927955 https://doi.org/10.1594/PANGAEA.927955 |
op_coverage |
LATITUDE: 73.816000 * LONGITUDE: 7.523468 * DATE/TIME START: 2016-07-10T00:00:00 * DATE/TIME END: 2017-06-05T00:00:00 * MINIMUM ELEVATION: -669.0 m * MAXIMUM ELEVATION: -663.0 m |
long_lat |
ENVELOPE(7.523468,7.523468,73.816000,73.816000) |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic North Atlantic Phytoplankton |
genre_facet |
Arctic Arctic North Atlantic Phytoplankton |
op_relation |
Hanz, Ulrike; Roberts, Emyr Martyn; Duineveld, Gerard C A; Davies, Andrew; van Haren, Hans; Rapp, Hans Tore; Reichart, Gert-Jan; Mienis, Furu (accepted): Long‐term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep‐Sea Sponge Ground. Journal of Geophysical Research: Oceans, 126(3), https://doi.org/10.1029/2020JC016776 https://doi.pangaea.de/10.1594/PANGAEA.927955 https://doi.org/10.1594/PANGAEA.927955 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.927955 https://doi.org/10.1029/2020JC016776 |
_version_ |
1766300278896721920 |