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

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66 depth horizon description sample-ID (cm) (KA4 / ST) 0-2 Ah / A extreme strong rooted, black (10YR 2/1) sand, very high G03-78 content of organic material 2-6 Go1 / Bo very strong rooted, very dark greyish brown (10 YR 3/2) G03-79 (2-4 sand, medium content of organic material, 2-4 cm: layer cm) of dark brown (7,5YR 3/3) iron oxide G03-80 (4-6 cm) 6-29 Gr 1 / Bg 1 sparse rooted, dark grey (2,5 Y 4/1) sand, very low content of organic material, with very dark grey (10YR 3/1) spots of organic material, 10-20 % pebbles G03-81 29- Gr 2 / Bg 2 non rooted, olive brown (2,5 Y 4/3) sand, no organic G03-82 50+ material, layer of dark grey (10YR 4/4) iron oxide in the upper 1-2cm Tab. 6.4-3: Gley (site 2) location: Store Koldewey; N 76°25’14.6’’ W 018°44’39.7’’ landform / elevation: end of a slope at the shore of Duck Lake, 118 m a.s.l. vegetation: mosses, lichens, willows (Salix arctica), cotton grass; vegetation cover: 80 % water table: 20 cm parent material: moraine material; boulders overlain by sandy material, transported by melt water KA4: Gley Soil Taxonomy: Cryaquept depth horizon description sample-ID (cm) (KA4 / ST) 0-4 Ah / A sparse rooted, dark grey (10YR 4/1) silty sand, low content of organic material, 30 % pebbles G03-83 4-35 ilC1 / C very sparse rooted, dark greyish brown (10YR 4/2) silty sand, no organic material, from 21 cm to the bottom of the horizon high moisture content G03-46 35-44 ilC2 / 2 C non-rooted, dark greyish brown (2,5Y 4/2) sandy clay, no organic material, 20 % pebbles (2-3 cm) G03-47 44- ilC3 / 3 non-rooted, dark grey (2,5 Y 4/1) loamy clay, no organic G03-48 60+ Cdx material, extreme high density Tab. 6.4-4: Regosol (site 3) location: Store Koldewey; N 76°35’14.3’’ W 018°44’16.3’’ landform / elevation: plane on top of hill, near Duck Lake, 176 m a.s.l. vegetation: mosses, lichens; vegetation cover: 10 % water table: - parent material: sand, deposited by glacier or melt water, underlain by sandy clay deposited by glacier, underlain by extreme dense clay (probably overconsolidated by glacier weight) KA4: Regosol Soil Taxonomy: Cryofluvent
Fig. 6.4-2: Methane emission measurement site 2, at Duck Lake (see Tab. 6.4-3). In general, the dry conditions in northeastern Greenland characterize the soil and vegetation. The landscape of the investigated areas is dominated by polar desert soils. The vegetation cover is scarce, leading to a low content of humus in a thin upper layer of the soil. However, along streams and near the lakes there were also areas with water saturated soils and a better-developed vegetation cover. The analyses carried out later in the laboratory will indicate, if these conditions are suitable for some methane producing microorganisms. Lakes: The amount of methane emission from aquatic ecosystems is the result of microbial production and consumption by oxidation. Microbial production of methane is one of the major pathways of degradation of organic matter in the anaerobic sediment horizons. The produced methane can be oxidised in the upper, oxygen rich surface sediments or in the water column. The measurement of methane emissions from the sediment and water column was performed at Melles, Duck and Fox Lake near the shore (c. 10 to 15 m distance) at sites relatively close to the sites, where the soil investigations were carried out at the lake shores. The system used for measuring the gas emission of the lakes was the same which was used for the soil (Fig. 6.4-1). The chamber was placed directly on the water surface. It was kept horizontally floating by eight floating bodies, sinking about 6 cm into the water. The minimum time to collect the emitted gas at each spot was half an hour. In addition to the measurements of the methane emissions from the lakes, also the methane concentrations in the water columns and the sediments were examined. For a better understanding of the variables that potentially affect the methane emission from a lake, the water depth, sediment and water temperature, pH-value was 67
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the Expedition ARKTIS-XIX/4 of the
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1 Cruise summary W. Jokat The exped
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6 1.1 Wetterverlauf ARK XIX/4a Bei
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8 noch vor der Küste, fern davon a
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10 northerly wind increased steadil
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12 In the latest stages of the proj
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Profile Date/Time Start Date/Time T
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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
Page 62 and 63: 60 6.3 Diatom phytoplankton and phy
Page 64 and 65: 62 Generally, all sampled benthic s
Page 66 and 67: 64 shaped profile at the top were i
Page 70 and 71: 68 measured in the field, and the c
Page 72 and 73: 70 Summary of results The summit pl
Page 74 and 75: 72 Pre-Holocene shell material Pre-
Page 76 and 77: 74 Christensen, T.R. (1993): Methan
Page 78 and 79: 76 No EVK2-2001-00215 (ASOF-N). The
Page 80 and 81: 78 Altimeters Model 2110-2, SN 189
Page 82 and 83: 80 Mooring Latitude Longitude Water
Page 84 and 85: 82 Mooring Latitude Longitude Water
Page 86 and 87: 84 30° W 20° W 30° W Greenland 2
Page 88 and 89: Fig. 7-4: Vertical transects of pot
Page 90 and 91: 88 8 Bericht zur akustischen Vermes
Page 92 and 93: 90 Quality control sheet - Profile
Page 94 and 95: 92 Quality control sheet - Profile
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142 Beteiligte Institutionen / Part
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144 Fahrtteilnehmer / Participants
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