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

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The comparison of the entity of the 14 CTD casts obtained during ARK XIX/3b, shows modest anomalies in temperature and salinity right above the plume. More distinct are anomalies in the transmission and nephelometer records. Water samples from the CTD as well as from the bottom water sampler have been taken for immediate shipboard and subsequent laboratory analyses, respectively, for oxygen, methane, nutrients, radon-222, and different microbiological parameters. According to preliminary results, oxygen and methane measured on the water samples correlate well with acoustic plume indications. Other parameters have to be measured in the insitute’s laboratories back home. Bottom current measurements With the aim to understand gas discharge and the fate of methane in the water column above HMMV bottom currents have been observed 1) by current vanes and 2) by a newly available high precisision currentmeter of the type Nobska MAVS3. Both instruments werde deployed by means of "Victor 6000" and used to characterize the near bottom current milieu in different heights above the sea floor. In addition to the measurement of horizontal bottom current velocities, the MAVS3 currentmeter was used to determine horizontal current velocities and the outflow rates at fluid discharge locations. - 189 -
B. 5 Biological investigations at the Håkon Mosby Mud Volcano (HMMV) B. 5.1 Geomicrobiology of sediments and bottom waters of the Håkon Mosby Mud Volcano Boetius, A., Beier, V., Niemann, H., Müller, I., Heinrich, F., Feseker, T. Since January 2001 the BMBF-funded project MUMM (Mikrobieller Umsatz von Methan in gashydrathaltigen Sedimenten) investigates the microbial methane turnover above focussed sources of methane in the sea. Other key research areas are Hydrate Ridge (Cascadia Margin off Oregon, USA, projects LOTUS and OMEGA, GEOMAR), the pockmarks off Congo continental slope (University Bremen) and the methane seeps of the north-western Black Sea (project GHOSTDABS, University Hamburg). The Håkon Mosby Mud Volcano on the Barents Sea continental margin is of medium depths and coldest site investigated in this project. The investigations at HMMV in the framework of the project MUMM in cooperation between MPI, AWI, University of Bremen, and the IFREMER aim at an analysis of the main factors regulating the activity of the methanotrophic microorganisms and their contribution to biogeochemical fluxes at this mud volcano. There are three main work packages planned: 1) geomicrobiological investigations, 2) high resolution biogeochemistry with microsensores (see B. 5.3; Witte, U.), 3) in situ measurements with benthic landers (se B. B. 5.2; DeBeer, D. and Eickert, G.). Microbially mediated anaerobic oxidation of methane (AOM) is the major biological sink of methane in marine sediments. Hence, this process is crucial in maintaining a sensitive balance of our atmosphere’s greenhouse gas content. However, a fundamental understanding of the associated biology is still lacking, consequently preventing a thorough biogeochemical understanding of an integral process in the global carbon cycle. Studies employing stable isotopes, radiotracers, modelling, and microbiological techniques have now established that methane in marine sediments is oxidized biologically under anoxic conditions. Although no anaerobic methanotroph has ever been isolated, biogeochemical studies have shown that the overall process involves a transfer of electrons from methane to sulfate. Accordingly, the isotopic and genetic signatures of the dominant microbial populations in environments enriched with methane proved that this transfer is mediated by a microbial consortium that includes archaea and sulfate-reducing bacteria. The current hypothesis is that AOM is - 190 -
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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
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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
Page 139 and 140: Fig. A4.8.2-7: Top left) Yellow alc
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Page 145 and 146: "Belgica mounds" - Porcupine Seabig
Page 147 and 148: "Twin mounds" - Porcupine Bank 14°
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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 and 172: Temperature / Gravity Corer # GC9 #
Page 173 and 174: Table B3.2-1: Technical specificati
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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
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Page 189: As an example, a echo sounder image
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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
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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
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Page 225 and 226: References Milkov, A., Vogt, P., Ch
Page 227 and 228: ROV "Victor 6000" The ROV "Victor 6
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Page 231 and 232: A multiple corer was used to retrie
Page 233 and 234: At the position of the moorings a C
Page 235 and 236: Micro profiles of O 2 but also of p
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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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