Preface The expedition ARK XIX/3 with the German icebreaking RV ...

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This maximum differs from location to location but we never find temperatures above 25°C. This verifies the hypothesis that very high surface gradients cannot sustain into greater depth. It is remarkable to find a horizontal temperature gradient of almost 20°C over 300 m horizontal distance at 10 mbsf between GC3 and GC4. B. 3.2 Physical properties of gravity cores Usbeck, R., Rogenhagen, J. The physical properties of sediment cores (gravity cores only) were measured using a GEOTEK ‚MultiSensorCoreLogger’ (MSCL). P-wave travel times, magnetic susceptibility, and -absorption were measured simultaneously with control measurements of core diameter and temperature. From these data, the physical properties density, magnetic susceptibility, fractional porosity, P-wave velocity, and impedance can be calculated. The technical description of the system is given in Table B3.2-1. Because of the high gas content (and sometimes, hydrate) of the cores, the logging had to be performed right after retrieval at low temperatures. Therefore, the logging instrument was set up in a reefer at 4-6°C and the cores were logged from bottom to top. After logging, the cores were brought back to the working deck for opening and further processing. Doing so, the time used for the whole procedure from retrieval of the cores to opening could be kept shorter than one hour. Summary of results As the sediments of Håkon Mosby are partly very warm right beneath the surface, the measurements could not be performed at constant conditions with respect to both, sediment temperatures and instrument temperatures. - 171 -
Table B3.2-1: Technical specifications of the GEOTEK MSCL14 P-wave velocity and core diameter Plate-transducer diameter: 4 cm Transmitter pulse frequency: 500 kHz Pulse repetition rate: 1 kHz Received pulse resolution: 50 ns Gate: 2800 Delay: 10 µs P-wave travel time offset: 7.49 µs (SL, 2*2.5 mm liner thickness, measured at 6°C) Density Gamma ray source: Cs-137 Activity: 356 MBq Energy: 0.662 MeV Collimator diameter: 5.0 mm (SL) Gamma detector: Gammasearch2, Model SD302D, Ser. Nr. 3043 , John Caunt Scientific Ltd., 10 s counting time Fractional porosity Mineral grain density = 2.75 water density = 1.026 Magnetic susceptibility Loop sensor: BARTINGTON MS-2C, Ser. Nr. 208 Loop sensor diameter: 14 cm Alternating field frequency: 565 Hz, counting time 10 s precision 0.1 * 10 -5 (SI) Magnetic field intensity: ca. 80 A/m RMS Krel: 1.56 (SL, 12 cm core-ø), 0.69 Loop sensor correction coefficient: 6.391 (SL) for 10 -6 (SI) Therefore, care has to be taken when interpreting absolute numbers of all parameters measured. Altogether, 33m of sediment cores have been retrieved. Table B3.2-2 summarizes positions and retrievals for all cores and Figure B3.2-1 shows the core positions at Håkon Mosby. - 172 -
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Preface The expedition ARK XIX/3 wi
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B. 1 Cruise leg ARK XIX/3b: An intr
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The ARK XIX/3 expedition A. 1 Itine
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positioning and navigation of the "
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was followed to obtain video materi
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On Friday morning the 20 th of June
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Fig. A1-2: The working area of the
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"Polarstern" (actual air temperatur
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6000" was still at depth "Polarster
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aseline navigation antennae which a
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Fig. A1-3: Entire cruise track of R
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At end of the leg pressure rising b
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The temperatures during the cruise
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Most frequent wind direction was so
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A. 3.1 High resolution seabed mappi
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On the other hand, the accuracy of
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The sampling campaign was also unde
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Hydrosweep DS2 is installed onboard
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Fig. A4.2-2: Normalized backscatter
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In addition to the micro bathymetry
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ackscatter value of -37.0dB, -38.9d
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athymetry and angular backscatter d
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A. 4.3 Sedimentary and hydrodynamic
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glacial periods. There is also evid
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Fig. A4.3.2-2: Visualisation of dif
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It seems that all the mounds along
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Visible calcareous fauna removed (b
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Fig. A4.3.3-2 Location of SAMS Phot
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Box Core Sample Log Sheet Station N
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A. 4.3.4 Influence of mound topogra
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A. 4.3.5 Photo lander deployment on
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- UMI data logger controlling a tra
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Fig. A4.3.5-3. Close-up view of the
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Lineated features are present NE of
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CARACOLE Cruise Report 30/07/2001 (
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intermediate nepheloid layers (Dick
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Fig. A4.4.1-2. Location of main stu
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A. 4.4.3 Biogeoprocesses along the
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in the database with the exact posi
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The areas with significant benthic
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predators and strong bottom current
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faunal distribution. Palaentologica
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ocks predate the last glaciation, s
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A. 4.4.6 Biological and geological
Page 121 and 122: Hovland M, Croker PF, Martin M (199
Page 123 and 124: Live fauna Sediments Live fauna and
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Page 127 and 128: 4) The NSOW has similar water mass
Page 129 and 130: 0 100 200 300 400 500 600 700 800 P
Page 131 and 132: A. 4.8 Deep water coral ecology and
Page 133 and 134: and video observations made. On ret
Page 135 and 136: Fig. A4.8.2-2: This orange, planar
Page 137 and 138: Fig. A4.8.2-4: Feather-shaped alcyo
Page 139 and 140: Fig. A4.8.2-7: Top left) Yellow alc
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Page 143 and 144: survey at frequencies of 38, 70, 12
Page 145 and 146: "Belgica mounds" - Porcupine Seabig
Page 147 and 148: "Twin mounds" - Porcupine Bank 14°
Page 149 and 150: corals were alive, relatively abund
Page 151 and 152: Network Setup for Tests The setup f
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Page 155 and 156: pressure produced as a consequence
Page 157 and 158: surrounded by elevated sediment fea
Page 159 and 160: B. 2 Microbathymetry on ROV "Victor
Page 161 and 162: Pitch correction Due to assembling
Page 163 and 164: Maps Complete area Håkon Mosby Mud
Page 165 and 166: B. 3 Geochemistry, geophysics and s
Page 167 and 168: Heat Flow HMMV 2m # # # # # # # # #
Page 169 and 170: Lat_dec. Lon_dec Name k T_0m PS64/s
Page 171: Temperature / Gravity Corer # GC9 #
Page 175 and 176: Sound velocity: As the cores all co
Page 177 and 178: Fig. B3.3-1: Display of a 4 km long
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Page 181 and 182: Fig. B3.4-1b: Lithological descript
Page 183 and 184: Fig. B3.4-1d: Lithological descript
Page 185 and 186: Fig. B3.4-1f: Lithological descript
Page 187 and 188: hydrotroilite and gas hydrate, this
Page 189 and 190: As an example, a echo sounder image
Page 191 and 192: B. 5 Biological investigations at t
Page 193 and 194: - How much methane is oxidized aero
Page 195 and 196: profiler). Bottom water samples hav
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Page 199 and 200: 1 kg of tubeworms in wet weight. Th
Page 201 and 202: B. 5.2 Microscale analysis of the s
Page 203 and 204: Laboratory measurements Central sit
Page 205 and 206: O2, CO3-- (mM) Beggiatoa mats, 30/0
Page 207 and 208: Photograph of the sulfide oxidising
Page 209 and 210: Central area No measurements could
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Page 213 and 214: B. 5.3 Methane in gas hydrate beari
Page 215 and 216: The deployments covered 3 (5) diffe
Page 217 and 218: flows at the Håkon Mosby Mud Volca
Page 219 and 220: The quality of the mosaics depends
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References Milkov, A., Vogt, P., Ch
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ROV "Victor 6000" The ROV "Victor 6
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has spent in organising the coring
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A multiple corer was used to retrie
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At the position of the moorings a C
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Micro profiles of O 2 but also of p
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The current regime luff and lee sid
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2° 3° 4° N2 5° PS64/481 PS64/48
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station IRD archive liner bulk x-ra
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C. 4 Marine Geology Kukina, N. Majo
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2° 3° 4° 5° 6° PS64/481 79°20
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Appendix 1: List of samples for fut
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material via the Transpolar Drift t
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ounding processes as well. One poss
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The most frequent rock type is sand
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Eastern Greenland, Iceland and Scan
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C. 6 Debris on the seafloor at “H
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Results A summary of the results is
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enthic community are of crucial imp
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frame showed no obvious colonisatio
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subsamples (area of 400 - 800 cm 2
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using shipboard techniques - provid
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Tab C11-1: Stationlist of in situ m
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Tab. C11-2: In-situ measurements of
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Tab. C11-2: In-situ measurements of
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Climate models predict that global
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90 mean copepod densities/ 10 cm 2
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- Molecular phylogeny and phylogeog
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Species Stations Tmetonyx sp.1 326-
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was used to terminate and sample th
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openings of 45° at both sides the
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Station Date Time PositionLat Posit
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E. Participating institutes / compa
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Acronym Participants iSiTEC GmbH IS
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F. Participants F. 1 Participants A
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F. 2 Participants ARK XIX/3b Armand
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F. 3 Participants ARK XIX/3c Bauerf
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Preface The expedition ARK XIX/3 with the German icebreaking RV ...

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