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Fernández-Méndez, Mar; Peeken, Ilka; Boetius, Antje (2014): Carbon uptake rate calculated for sea-ice core samples during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.834215, In supplement to: Fernández-Méndez, Mar; Katlein, Christian; Rabe, Benjamin; Nicolaus, Marcel; Peeken, Ilka; Bakker, Karel; Flores, Hauke; Boetius, Antje (2015): Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012. Biogeosciences, 12, 3525-3549, https://doi.org/10.5194/bg-12-3525-2015

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Abstract:
Net Primary Production was measured using the 14**C uptake method with minor modifications. Melted sea ice samples were spiked with 0.1µCi ml**-1 of 14**C labelled sodium bicarbonate (Moravek Biochemicals, Brea, USA) and distributed in 10 clear bottles (20 ml each). Subsequently they were incubated for 12 h at -1.3°C under different scalar irradiances (0-420 µmol photons m**-2 s**-1) measured with a spherical sensor (Spherical Micro Quantum Sensor US-SQS/L, Heinz Walz, Effeltrich, Germany). At the end of the incubation, samples were filtered onto 0.2 µm nitrocellulose filters and the particulate radioactive carbon uptake was determined by liquid scintillation counting using Filter count scintillation cocktail (Perkin Elmer, Waltham, USA). The carbon uptake values in the dark were subtracted from the carbon uptake values measured in the light incubations. Dissolved inorganic carbon (DIC) was measured for each sample using the flow injection system (Hall and Aller, 1992). The DIC concentration was taken into account to calculate the amount of labeled bicarbonate incorporated into the cell. Carbon fixation rates were normalized volumetrically and by chlorophyll a. Photosynthesis-irradiance curves (PI curves) were fitted using MATLAB® according to the equation proposed by Platt et al. (1980) including a photoinhibition parameter (beta) and providing the main photosynthetic parameters: maximum Chla normalized carbon fixation rate if there were no photoinhibition (Pb) and the initial slope of the saturation curve (alpha). The derived parameters: light intensity at which photosynthesis is maximal (Im), the carbon fixation rate at that maximal irradiance (Pbm) and the adaptation parameter or photoacclimation index (Ik) were calculated according to Platt et al. (1982).
Source:
Bakker, Karel (2014): Nutrients measured on sea-ice core samples during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.834084
Funding:
Seventh Framework Programme (FP7), grant/award no. 294757: Assessment of bacterial life and matter cycling in deep-sea surface sediments
Coverage:
Median Latitude: 84.660111 * Median Longitude: 81.935185 * South-bound Latitude: 81.884667 * West-bound Longitude: 17.453670 * North-bound Latitude: 88.827670 * East-bound Longitude: 131.128670
Date/Time Start: 2012-08-09T08:08:00 * Date/Time End: 2012-09-29T15:10:00
Minimum DEPTH, ice/snow: 0.2000 m * Maximum DEPTH, ice/snow: 1.4630 m
Event(s):
PS80/224-1 (Ice station #1) * Latitude Start: 84.050500 * Longitude Start: 31.113830 * Latitude End: 84.033833 * Longitude End: 31.109500 * Date/Time Start: 2012-08-09T08:08:00 * Date/Time End: 2012-08-11T12:23:00 * Elevation Start: -4013.0 m * Elevation End: -4011.0 m * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: Position sensor: Ship's GPS; Wind speed start: 0.2 kn; Wind speed end: 0.2 kn; Sea ice coverage start: 95 %; Sea ice coverage end: 95 %
PS80/237-1 (Ice station #2) * Latitude Start: 83.986500 * Longitude Start: 78.103330 * Latitude End: 83.933667 * Longitude End: 75.504667 * Date/Time Start: 2012-08-14T13:10:00 * Date/Time End: 2012-08-16T18:42:00 * Elevation Start: -3484.0 m * Elevation End: -3424.0 m * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: Position sensor: Ship's GPS; Wind speed start: 0.3 kn; Wind speed end: 0.6 kn; Sea ice coverage start: 90 %; Sea ice coverage end: 80 %
PS80/255-1 (Ice station #3) * Latitude Start: 82.670670 * Longitude Start: 109.589500 * Latitude End: 83.142333 * Longitude End: 109.929333 * Date/Time Start: 2012-08-20T08:48:00 * Date/Time End: 2012-08-22T11:49:00 * Elevation Start: -3569.0 m * Elevation End: -3608.0 m * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: Position sensor: Ship's GPS; Wind speed start: 0.6 kn; Wind speed end: 0.9 kn; Sea ice coverage start: 95 %; Sea ice coverage end: 95 %
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample label
2Optional event labelEvent 2
3GearGear
4DescriptionDescription
5Latitude of eventLatitude
6Longitude of eventLongitude
7Date/Time of eventDate/Time
8Date/time startDate/time start
9CommentComment
10DEPTH, ice/snowDepth ice/snowmGeocode
11Depth, top/minDepth topm
12Depth, bottom/maxDepth botm
13Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 420 [µmol photons/m**2/s]
14Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 370 [µmol photons/m**2/s]
15Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 150 [µmol photons/m**2/s]
16Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 90 [µmol photons/m**2/s]
17Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 65 [µmol photons/m**2/s]
18Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 50 [µmol photons/m**2/s]
19Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 25 [µmol photons/m**2/s]
20Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 13 [µmol photons/m**2/s]
21Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 8 [µmol photons/m**2/s]
22Carbon uptake rate, fractionatedC upt rate fracµg/l/dayBoetius, AntjeMeasuredat light irradiance 0 [µmol photons/m**2/s]
23Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 420 [µmol photons/m**2/s]
24Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 370 [µmol photons/m**2/s]
25Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 150 [µmol photons/m**2/s]
26Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 90 [µmol photons/m**2/s]
27Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 65 [µmol photons/m**2/s]
28Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 50 [µmol photons/m**2/s]
29Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 25 [µmol photons/m**2/s]
30Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 13 [µmol photons/m**2/s]
31Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 8 [µmol photons/m**2/s]
32Carbon uptake rate, fractionated per chlorophyll aC upt rate frac norm chl amg/mg/hBoetius, AntjeMeasuredat light irradiance 0 [µmol photons/m**2/s]
33ParameterParameterarbitrary unitsBoetius, AntjeCalculatedPb (Photoinhibition) [mg C/mg Chl a/h]
34ParameterParameterarbitrary unitsBoetius, AntjeCalculatedInitial slope alpha [mg C/mg Chl a/(µmol photons/m**2/s)/h]
35ParameterParameterarbitrary unitsBoetius, AntjeCalculatedPhotoinhibition [mg C/mg Chl a/(µmol photons/m**2/s)/h]
36ParameterParameterarbitrary unitsBoetius, AntjeCalculatedIm (light intensity at which photosynthesis is maximal) [µmol photons/m**2/s]
37ParameterParameterarbitrary unitsBoetius, AntjeCalculatedPbm (carbon fixation rate at that maximal irradiance) [mg C/mg Chl a/h]
38ParameterParameterarbitrary unitsBoetius, AntjeCalculatedAdaptation parameter Ik (or photoacclimation index calculated according to Platt et al., 1982) [µmol photons/m**2/s]
39ParameterParameterarbitrary unitsBoetius, AntjeCalculatedR**2
Size:
557 data points

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