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

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and speeds exceeded 50 cm s -1 on all diurnal tidal cycles 2-3 days either side of spring tides (pers. comm. M White). The maximum mean daily currents occurred at diurnal spring tides and the minimum at neap tides. Similar observations have been recorded to the north of the Galway mound by Pingree and LeCann (1989, 1990). Full analysis of this and other datasets is on-going. A. 4.3.6 Influence of hydrodynamics on sedimentary processes: "Belgica mounds" and "Moira mounds" Foubert, A., Wheeler, A. The "Moira mounds" are identified in the "Belgica mound" Province (Fig. A4.1-1) and were first imaged on 100 and 410 kHz sidescan sonar (Wheeler et al., 2000). These are small mounds up to 5-10 m high and 15 to 40 m across. The mounds include isolated examples although most occur in swarms or clusters (Wheeler et al., subm.). The "Moira mounds" located to the east of "Thérèse mound" were investigated using the ROV "Victor 6000" (Olu-Le Roy et al., 2002). These video dives and sidescan sonar images showed that the "Moira mounds" occur in areas of active sediment transport on rippled sand sheets in areas of sediment wave development (Wheeler et al., subm.). A rippled sand facies with occasional dropstones and isolated coral patches is present in between the mounds. The flanks of the mounds are characterised by patches of live coral coverage in a rippled sand facies. Towards the centre of the mounds the coral framework becomes denser (Wheeler et al., subm.). The "Moira mounds" are confined to the present-day seabed surface with no seismic evidence for buried components. This implies that the "Moira mounds" are probably a recent feature (?Holocene). The use of the multibeam echosounder SIMRAD EM2000 mounted on the ROV "Victor 6000" made it possible to map the "Moira mounds" by producing a very highresolution microbathymetric grid with a pixel size corresponding to 20 cm. All the data were recorded and processed in Qinsy (Fig. A4.3.6-1). The microbathymetric grid helps a lot by interpreting the hydrodynamic setting of the "Moira mounds". Sandwaves up to 50 cm high and with a wavelength of 15 to 20 m, are visualised and seem to be aligned E-W. They demonstrate the presence of strong northerly-directed benthic bottom currents. - 79 -
Lineated features are present NE of this sandwave-field and can be interpreted by palaeo-features, aligned N-S and having a length about 200 to 250 m and possibly formed by (helicoidally) strong currents. The Moira-mounds themselves are clustered in front of and on these lineated features offering a hard surface suitable for coral settlement and attachment. © copyright IFREMER 2003 Fig. A4.3.6-1: Microbathymetric grid over "Moira mounds" References Beyer, A., Schenke, H.W., Klenke, M. & Niederjasper, F. (2003) High resolution bathymetry of the eastern slope of the Porcupine Seabight. Marine Geology, 198, 27-54. De Mol, B., Van Rensbergen, P., Pillen, S., Van Herreweghe, K., Van Rooij, D., MacDonnell, A., Huvenne, V., Ivanov, M., Swennen, R. & Henriet. J.P. (2002). Large deep-water coral banks in the Porcupine Basin, southwest of Ireland. Marine Geology, 188, 193-231. de Haas, H., Huvenne, V., Wheeler. A., Unnithan, V. & shipboard scientific crew (2002). M2002 Cruise report (R.V. Pelagia Cruise 64PE197): A TOBI Side Scan Sonar Survey of Cold Water Coral Carbonate Mounds in the Rockall Trough and Porcupine Sea Bight - Texel-Southampton-Galway, 21 June – 14 July 2002. Royal Netherlands of Sea Research, Texel, The Netherlands, 2002. - 80 -
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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
Page 29 and 30: A. 3.1 High resolution seabed mappi
Page 31 and 32: On the other hand, the accuracy of
Page 33 and 34: The sampling campaign was also unde
Page 35 and 36: Hydrosweep DS2 is installed onboard
Page 37 and 38: Fig. A4.2-2: Normalized backscatter
Page 39 and 40: In addition to the micro bathymetry
Page 41 and 42: ackscatter value of -37.0dB, -38.9d
Page 43 and 44: athymetry and angular backscatter d
Page 45 and 46: A. 4.3 Sedimentary and hydrodynamic
Page 47 and 48: glacial periods. There is also evid
Page 49 and 50: Fig. A4.3.2-2: Visualisation of dif
Page 51 and 52: It seems that all the mounds along
Page 53 and 54: Visible calcareous fauna removed (b
Page 55 and 56: Fig. A4.3.3-2 Location of SAMS Phot
Page 57 and 58: Box Core Sample Log Sheet Station N
Page 73 and 74: A. 4.3.4 Influence of mound topogra
Page 75 and 76: A. 4.3.5 Photo lander deployment on
Page 77 and 78: - UMI data logger controlling a tra
Page 79: Fig. A4.3.5-3. Close-up view of the
Page 83 and 84: CARACOLE Cruise Report 30/07/2001 (
Page 85 and 86: intermediate nepheloid layers (Dick
Page 87 and 88: Fig. A4.4.1-2. Location of main stu
Page 95 and 96: A. 4.4.3 Biogeoprocesses along the
Page 99 and 100: in the database with the exact posi
Page 101 and 102: The areas with significant benthic
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Page 105 and 106: faunal distribution. Palaentologica
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Page 119 and 120: 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
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A. 4.8 Deep water coral ecology and
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and video observations made. On ret
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Fig. A4.8.2-2: This orange, planar
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Fig. A4.8.2-4: Feather-shaped alcyo
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Fig. A4.8.2-7: Top left) Yellow alc
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scour or demersal trawling. The gro
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survey at frequencies of 38, 70, 12
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"Belgica mounds" - Porcupine Seabig
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"Twin mounds" - Porcupine Bank 14°
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corals were alive, relatively abund
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Network Setup for Tests The setup f
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are only initial testings and much
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pressure produced as a consequence
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surrounded by elevated sediment fea
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B. 2 Microbathymetry on ROV "Victor
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Pitch correction Due to assembling
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Maps Complete area Håkon Mosby Mud
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B. 3 Geochemistry, geophysics and s
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Heat Flow HMMV 2m # # # # # # # # #
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Lat_dec. Lon_dec Name k T_0m PS64/s
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Temperature / Gravity Corer # GC9 #
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Table B3.2-1: Technical specificati
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Sound velocity: As the cores all co
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Fig. B3.3-1: Display of a 4 km long
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sediment cores varies between 166 t
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Fig. B3.4-1b: Lithological descript
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Fig. B3.4-1d: Lithological descript
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Fig. B3.4-1f: Lithological descript
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hydrotroilite and gas hydrate, this
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As an example, a echo sounder image
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B. 5 Biological investigations at t
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- How much methane is oxidized aero
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profiler). Bottom water samples hav
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the water column was measured using
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1 kg of tubeworms in wet weight. Th
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B. 5.2 Microscale analysis of the s
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Laboratory measurements Central sit
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O2, CO3-- (mM) Beggiatoa mats, 30/0
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Photograph of the sulfide oxidising
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Central area No measurements could
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the temperature profile showed adve
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B. 5.3 Methane in gas hydrate beari
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The deployments covered 3 (5) diffe
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flows at the Håkon Mosby Mud Volca
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The quality of the mosaics depends
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[2] Vincent AG, Pessel N, Borgetto
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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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