Wenzhöfer, Frank; Bienhold, Christina; Boetius, Antje (2022): Diffusive oxygen uptake from the Laptev Sea (Arctic Ocean) during POLARSTERN cruise ARK-XXVII/3 (IceArc) from August-September 2012 [dataset]. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.945454
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Abstract:
In this study, we measured a range of biogeochemical parameters down the Laptev Sea continental slope, from around 50 to 3400 m water depth. These included chlorophyll pigments, extracellular enzymatic activity, diffusive oxygen uptake and prokaryotic cell abundance. Our aim was to compare the measurements between two years about two decades apart (1993 and 2012).
Benthic oxygen consumption rates were determined from ex situ microsensor measurements of diffusive oxygen uptake in retrieved sediment cores, consistent with Boetius & Damm 1998 (doi:10.1016/S0967-0637(97)00052-6). Directly after recovery, cores were stored at in situ temperature and the overlying water gently stirred by rotating small magnets to avoid the development of a stagnate water body above the sediment. High-resolution microprofiles across the sediment water interface were measured using Clark-type O2 microelectrodes equipped with a guard cathode (Revsbach 1989 doi:10.4319/lo.1989.34.2.0474) mounted to motorized micromanipulator (Glud et al. 2009 doi:10.4319/lo.2009.54.1.0001). Sensors were calibrated at in situ temperature against (1) air-saturated bottom water taken from the overlying water from the MUC cores (100% saturation), and (2) dithionate-spiked bottom water (anoxic). Microprofiles across the sediment-water interface were measured with a vertical resolution of 100 μm on a total length of max. 5 cm. The diffusive oxygen uptake (DOU, mmol/m²/d¹) was calculated from the O2 gradient just below the sediment surface and Fick's first law of diffusion (Rasmussen and Jorgensen 1992 doi:10.3354/MEPS081289).
DOU = por * Ds * δC/δz
where Ds (cm⁻² s⁻¹) = molecular diffusion coefficient in sediment, calculated as Ds = D0 * por/m , where por is the porosity, D0 = diffusion coefficient in water and m = 3, C (μM) = solute concentration, z (cm) = depth in the sediment.
Carbon flux (remineralization rates, mg C/m²/d) were calculated from oxygen uptake at the seafloor assuming a molar ratio of C = 0.77 O2 as in Boetius & Damm 1998 (doi:10.1016/S0967-0637(97)00052-6).
Related to:
Bienhold, Christina (2021): Benthic bacterial diversity along the Laptev Sea continental slope in the Arctic Ocean between two contrasting years (1993 and 2012). insdc:PRJEB43433
Bienhold, Christina; Schourup-Kristensen, Vibe; Krumpen, Thomas; Nöthig, Eva-Maria; Wenzhöfer, Frank; Korhonen, Meri; Vredenborg, Myriel; Hehemann, Laura; Boetius, Antje (2022): Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012). Frontiers in Marine Science, 9, 1004959, https://doi.org/10.3389/fmars.2022.1004959
Original version:
Wenzhöfer, Frank; Bienhold, Christina; Boetius, Antje (2018): Diffusive oxygen uptake from the Laptev Sea (Arctic Ocean) during POLARSTERN cruise ARK-XXVII/3 (IceArc) from August-September 2012. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.892286
Project(s):
Funding:
Seventh Framework Programme (FP7), grant/award no. 294757: Assessment of bacterial life and matter cycling in deep-sea surface sediments
Coverage:
Median Latitude: 78.139077 * Median Longitude: 121.491029 * South-bound Latitude: 77.169170 * West-bound Longitude: 114.916000 * North-bound Latitude: 79.649820 * East-bound Longitude: 133.332780
Date/Time Start: 2012-08-28T21:22:00 * Date/Time End: 2012-09-02T20:39:00
Minimum Elevation: -3387.4 m * Maximum Elevation: -70.1 m
Event(s):
PS80/292-1 * Latitude: 79.649820 * Longitude: 130.597470 * Date/Time: 2012-08-28T21:22:00 * Elevation: -3387.4 m * Location: Arctic Ocean * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Multicorer with television (TVMUC) * Comment: Position sensor: Ship's GPS
PS80/299-1 * Latitude: 78.136150 * Longitude: 133.332780 * Date/Time: 2012-08-29T23:16:00 * Elevation: -786.6 m * Location: Laptev Sea * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Multicorer with television (TVMUC) * Comment: abgesetzt, SL=775m; Position sensor: USBL Ixsea Posidonia
PS80/309-1 * Latitude: 77.169170 * Longitude: 114.916000 * Date/Time: 2012-09-01T10:42:00 * Elevation: -70.1 m * Location: Laptev Sea * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Multicorer with television (TVMUC) * Comment: SL=62m; Position sensor: Ship's GPS
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Bienhold, Christina | |||
| 2 | Oxygen uptake, diffusive | DOU | mmol/m2/day | Bienhold, Christina | Oxygen microsensor, Clark type (Revsbech, 1989) | |
| 3 | Standard deviation | Std dev | ± | Bienhold, Christina | ||
| 4 | Carbon, total, flux | C flux | mg/m2/day | Bienhold, Christina | Calculated from oxygen uptake (Boetius & Damm, 1998) | |
| 5 | Sample comment | Sample comment | Bienhold, Christina |
Change history:
2022-06-16T09:14:45 – Version 2: Datapoints were corrected and new datapoints were added.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
31 data points