Hanz, Ulrike (2021): Long-term monitoring of near-bottom physical properties at an Arctic deep-sea sponge ground [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.927956
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Abstract:
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.
Supplement to:
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
Project(s):
Funding:
Horizon 2020 (H2020), grant/award no. 679849: Deep-sea Sponge Grounds Ecosystems of the North Atlantic
Coverage:
Latitude: 73.816000 * Longitude: 7.523468
Date/Time Start: 2016-06-25T01:07:30 * Date/Time End: 2017-07-27T12:05:13
Minimum DEPTH, water: 663.109 m * Maximum DEPTH, water: 663.109 m
Event(s):
GS2016109A-07-LAN-01 * Latitude: 73.816000 * Longitude: 7.523470 * Date/Time: 2016-06-20T22:25:00 * Elevation: -669.0 m * Location: Schultz Bank * Campaign: GS2016109A (GS16A-202) * Basis: G. O. Sars (2003) * Method/Device: Bottom lander (B_LANDER) * Comment: deployment
GS2017110-17-LAN-04 * Latitude: 73.816000 * Longitude: 7.523467 * Date/Time: 2017-07-27T11:10:00 * Elevation: -663.0 m * Location: Schultz Bank * Campaign: GS2017110 * Basis: G. O. Sars (2003) * Method/Device: Bottom lander (B_LANDER) * Comment: Retrievement of lander from 2016
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Hanz, Ulrike | Geocode | ||
| 2 | Temperature, water | Temp | °C | Hanz, Ulrike | Combined temperature and oxygen sensor (Advantech RINKO) | |
| 3 | DEPTH, water | Depth water | m | Hanz, Ulrike | Geocode | |
| 4 | Salinity | Sal | Hanz, Ulrike | |||
| 5 | Density, sigma, in situ | Sigma in situ | kg/m3 | Hanz, Ulrike | ||
| 6 | Fluorescence, chlorophyll | F chl | µg/l | Hanz, Ulrike | Fluorometer/turbidity meter, WET Labs ECO FLNTU | |
| 7 | Turbidity | Turbidity | arbitrary units | Hanz, Ulrike | Fluorometer/turbidity meter, WET Labs ECO FLNTU | counts |
| 8 | Oxygen, dissolved | DO | % | Hanz, Ulrike | Combined temperature and oxygen sensor (Advantech RINKO) | |
| 9 | Oxygen, dissolved | DO | mg/l | Hanz, Ulrike | Combined temperature and oxygen sensor (Advantech RINKO) | |
| 10 | Current velocity, north-south | Cur vel V | cm/s | Hanz, Ulrike | Acoustic Doppler Current Profiler (ADCP; Teledyne-RDI, 1200 kHz, records 13 bins of 1 m between 3.55 and 15.55 m above bottom (mab)) | in 7.5 mab |
| 11 | Current velocity, east-west | Cur vel U | cm/s | Hanz, Ulrike | Acoustic Doppler Current Profiler (ADCP; Teledyne-RDI, 1200 kHz, records 13 bins of 1 m between 3.55 and 15.55 m above bottom (mab)) | in 7.5 mab |
| 12 | Current direction | DIR | deg | Hanz, Ulrike | Acoustic Doppler Current Profiler (ADCP; Teledyne-RDI, 1200 kHz, records 13 bins of 1 m between 3.55 and 15.55 m above bottom (mab)) | in 7.5 mab |
| 13 | Current speed | V | cm/s | Hanz, Ulrike | Acoustic Doppler Current Profiler (ADCP; Teledyne-RDI, 1200 kHz, records 13 bins of 1 m between 3.55 and 15.55 m above bottom (mab)) | in 7.5 mab |
| 14 | Backscatter | Backsc | Hanz, Ulrike | Acoustic Doppler Current Profiler (ADCP; Teledyne-RDI, 1200 kHz, records 13 bins of 1 m between 3.55 and 15.55 m above bottom (mab)) | accoustic, in counts |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
446772 data points
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