the Expedition ARKTIS-XIX/4 of the research vessel POLARSTERN ...

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10 northerly wind increased steadily up to Bft 8. Off the southern edge of the sea ice the characteristic wave height increased to about 3 m. In the late afternoon the vessel started the seismic cross near waypoint 75.9 N – 07 W. The gale centre decreased only little and became nearly stationary for the next 24 hours. So during the night the north-westerly wind reached force Bft 9. This was the maximum registered during the entire leg. In this night the sea wave height exceeded 5 m from time to time. Due to these conditions in the morning of Oct. 4 th all Helimagflights had to be cancelled. On the last day in the operation area west of Jan Mayen weak high pressure influence caused only light north-westerly winds and sunny weather. Therefore all planned helicopter flights could be carried out. The research work ended early Oct. 6 th . RV POLARSTERN was bound for Bergen (Norway). The gale became adult little east of Iceland on Oct. 6 th with minimum pressure close to 975 hPa and headed towards Denmark. In a distance of about 1000 km RV POLARSTERN followed this low. Due to this the wind first came only moderate from northwest to north but increased for some hours during the night to force Bft 7. RV POLARSTERN approached Bergen –pilot station in early Oct. 9 th . Fig. 1.2-1
2 Marine Geophysics W. Jokat, D. Berger, H. Bohlmann, V. Helm, M. Hensch, D. Jousselin, C. Klein, N. Lensch, P. Liersch, H. Martens, A. Medow, U. Micksch, L. Rabenstein, C. Salat, M. Schmidt-Aursch, A. Schwenk Summary–Statistics: - Tromsoe-Bremerhaven 10 th August to 13 th October (4b starts in Longyearbyen on the 21 st September) - Theme: Structure of the East Greenland margin from 74° to 77°N (part of an ESF project aiming at understanding the crustal architecture and evolution of the conjugate volcanic margins off mid-Norway and East Greenland in a total rift context). - 4 seismic refraction profiles using 126 stations (including 17 on land Reftek stations); each line is >300 km long; deployment, shooting and recovery took 85 to 116 hours. - seismic reflection survey with a 600 m streamer (96 channels; 6.25m group spacing); 2309 km of profiles; 52068 shots; 7 WNW-ESE lines, 160 to 280 km long each, 6 SSW-NNE lines, 40 to 60 km long each. - seismic reflection surveys with a 3000 m streamer (240 channels; 12.5 m group spacing); 2062 km of lines. 45969 shots (along refraction lines and coverage in between). - Magnetic survey (14.500 km of lines, 100 hours of helicopter flight); in addition continuous magnetic data recording with fixed vector magnetometers on the vessel - Continuous gravity data acquisition from Tromsø to Bremerhaven Description of the research project Understanding how the lithospheric plates breakup is a fundamental issue in Earth science. It is not known for instance if this key process in plate tectonics is mainly passively driven by continental collapse or if it is actively driven by plume activity. It is also important to better describe the margins crustal structure, as associated magmatism provides initial conditions for sea floor spreading and influences the thermal regime and vertical movements of the sedimentary basins. Our project is to study the conjugate volcanic margins off mid-Norway and East Greenland by geophysical techniques; this will provide constraints on the crustal structure and on the nature and the temporal sequence of events involved in volcanic margin formation and evolution. This project is divided in 3 parts: 1) Filling existing gaps along the mid-Norwegian margin 2) Collecting geophysical information along crustal transects across the East- Greenland margin 3) Carrying out a 3D detailed geophysical survey over a small area of the East- Greenland margin. 11
Page 1: the Expedition ARKTIS-XIX/4 of the
Page 5 and 6: 1 Cruise summary W. Jokat The exped
Page 8 and 9: 6 1.1 Wetterverlauf ARK XIX/4a Bei
Page 10 and 11: 8 noch vor der Küste, fern davon a
Page 14 and 15: 12 In the latest stages of the proj
Page 16 and 17: Profile Date/Time Start Date/Time T
Page 18 and 19: Station Typ Extra Lat Long Höhe [m
Page 20 and 21: Station Typ Extra Lat Long Höhe [m
Page 22 and 23: Date Flight Start Time End Time No
Page 32 and 33: 30 Preliminary results Along profil
Page 34 and 35: 32 In addition to the deep seismic
Page 36 and 37: 34 Fig. 2-5: Flight statistics for
Page 38 and 39: 36 Fig. 3-1: Seafloor topography of
Page 40 and 41: 38 In total, the PARASOUND system o
Page 42 and 43: 40 Figure 4.1-3: Example of PARASOU
Page 44 and 45: 42 Station Latitude Longitude Date
Page 46 and 47: 44 After PCR was finished, samples
Page 48 and 49: 46 Potsdam Lake (Shannon Island) Sc
Page 50 and 51: 48 In den Schmelzwassertümpeln kon
Page 52 and 53: Temp. Sal. Tiefe max. Tiefe Trübe
Page 54 and 55: 52 Store Koldewey Store Koldewey is
Page 56 and 57: 54 In the shallow ponds the hydrolo
Page 58 and 59: 56 The low amounts of solubles in t
Page 60 and 61: 58 lake core no. latitude longitude
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60 6.3 Diatom phytoplankton and phy
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62 Generally, all sampled benthic s
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64 shaped profile at the top were i
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66 depth horizon description sample
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68 measured in the field, and the c
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70 Summary of results The summit pl
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72 Pre-Holocene shell material Pre-
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74 Christensen, T.R. (1993): Methan
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76 No EVK2-2001-00215 (ASOF-N). The
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78 Altimeters Model 2110-2, SN 189
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80 Mooring Latitude Longitude Water
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82 Mooring Latitude Longitude Water
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84 30° W 20° W 30° W Greenland 2
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Fig. 7-4: Vertical transects of pot
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88 8 Bericht zur akustischen Vermes
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90 Quality control sheet - Profile
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92 Quality control sheet - Profile
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Station List Station Date Time Posi
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142 Beteiligte Institutionen / Part
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144 Fahrtteilnehmer / Participants
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