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

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distribution agrees with the assumption that coarser sediments are deposited first as the current runs down the channel and decreases in speed. Since the penetration depth of the multicorer is mainly driven by the water content of the sediments. The results of this study indicate that a higher backscatter grey level is caused by a higher water content of the sediments. However, a distinct effect of the grain size variation of the fine grained seafloor sediments on the backscatter grey level are not evident in this investigation. Shipborne Bathymetric surveys during the cruise ARKXIX/3a Hydrosweep is capable of determining the mean sonic velocity that is required for refraction correction of the slant sonar beams. This technique is known as cross fan calibration. However, in order to apply a local water sonic velocity profile and to prevent data gaps due to the calibration mode, CTD profiles of the water column recorded at various locations during the cruise were processed and finally used during the data acquisition with Hydrosweep. The Hydrosweep system recorded data during the entire cruise and provides detailed bathymetric data at the investigated locations. These locations are at the northernmost Gollum Channel and at the Belgica mound province at the eastern slope of the Porcupine Seabight, at the "Scarp" and "Hedge mounds" at the Porcupine Bank. Due to the slow speed during the operation of "Victor 6000" a gain in data quality is expected. During the bathymetric survey of the northernmost channel of the Gollum Channel system 70nm survey line have been covered. The aim of this survey is to extend the existing Polarstern bathymetry and backscatter data of that area towards the mouth of the channels in the west and to check whether changes of the backscatter data have occurred with respect to the cruise ANTXVII/4. Due to the video system attached to the MUC it became obvious that this channel is not active. This indicates comparable backscatter data from the leg ANTXVII/4 and ARKXIX/3a. Towards the end of the cruise a detailed survey of approximately 25nm was started closed to the "Hedge mounds". In this location there are channel heads cutting the continental margin. The data is appropriate for comparison with the Gollum channel - 41 -
athymetry and angular backscatter data. Table A4.2-1: description of the multicorer samples Station number Position Lat Position Lon Depth Penetration Comment (m) (cm) PS64/235-3 50° 35.09' N 11°25.92' W 1686 28 sandy, soft, no stratigraphy visible PS64/236-1 50°46.08' N 11°24.02' W 1021 20 muddy surface, thereafter more compact, anemone PS64/239-1 50°53.28' N 11°24.64' W 1160 26 sandy top, soft, compact layer PS64/240-1 50°53.30' N 11°28.95' W 1350 16 fine sand PS64/242-1 50°43.99' N 11°15.69' W 1092 10 top fine sand with little clay, ripples PS64/243-1 50°42.62' N 11°19.24' W 1341 14 sandy with little clay, macro fauna PS64/244-1 50°42.45' N 11°22.32' W 1522 32 sandy, soft, probably organic rich PS64/245-1 50°42.17' N 11°26.07' W 1674 26 mud, soft, no ripples PS64/246-1 50°42.32' N 11°28.13' W 1730 26 mud, soft, no ripples, lebensspuren PS64/247-1 50°42.15' N 11°24.10' W 1603 34 mud, soft, no ripples PS64/248-1 50°42.46' N 11°21.07' W 1479 32 fine sand, soft, no ripples, unstructured PS64/249-1 50°43.78' N 11°17.54' W 1191 24 fine sand, soft, no ripples, lots of macro fauna PS64/250-1 51°10.40' N 11°47.09' W 1536 no recovery, corals, strong current PS64/251-1 51°12.11' N 11°40.78' W 1017 30 sandy, stepwise penetration PS64/252-1 51°11.16' N 11°34.88' W 723 28 sandy, soft, ripples Table A4.2-2: Physical and acoustic properties of selected sediment samples. The depths of the grain size estimation and sediment changes were determined visually. The backscatter value represents the segment in which the sample was taken. - 42 -
Page 1 and 2: Preface The expedition ARK XIX/3 wi
Page 3 and 4: B. 1 Cruise leg ARK XIX/3b: An intr
Page 5 and 6: The ARK XIX/3 expedition A. 1 Itine
Page 7 and 8: positioning and navigation of the "
Page 9 and 10: was followed to obtain video materi
Page 11 and 12: On Friday morning the 20 th of June
Page 13 and 14: Fig. A1-2: The working area of the
Page 15 and 16: "Polarstern" (actual air temperatur
Page 17 and 18: 6000" was still at depth "Polarster
Page 19 and 20: aseline navigation antennae which a
Page 21 and 22: Fig. A1-3: Entire cruise track of R
Page 23 and 24: At end of the leg pressure rising b
Page 25 and 26: The temperatures during the cruise
Page 27 and 28: 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: ackscatter value of -37.0dB, -38.9d
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 and 80: Fig. A4.3.5-3. Close-up view of the
Page 81 and 82: Lineated features are present NE of
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
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Box Core Sample Log Sheet Station N
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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
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Hovland M, Croker PF, Martin M (199
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Live fauna Sediments Live fauna and
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sites can subsequently be transport
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4) The NSOW has similar water mass
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0 100 200 300 400 500 600 700 800 P
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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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### ( ) # ###### # ## # # # #### #
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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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- 248 -
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- 250 -
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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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