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52 Store Koldewey Store Koldewey is an elongated island off Northeast Greenland at 75°55’-76°45’ N and 018°27’-019°10’ W (Fig. 6-1). The island is c. 80 km long and has a maximum width of 10.5 km. Store Koldewey is separated from the mainland by the Dove Bugt in the west and adjoins the Grønlandshavet in the east. Because of its location off north eastern Greenland, it may have formed a natural barrier for the ice masses coming down from the mainland in the past. Therefore, parts of the island may have been unglaciated during the LGM or, relatively early deglaciated during the period of ice retreat. Located in the East Greenland Caledonian fold belt most parts of Store Koldewey are composed of Precambrian methamorphic bedrocks (mainly gneisses) older than 1800 Ma. Additionally, fossil (e.g., bivalves and ammonites) bearing Jurassic and Cretaceous marine sediments are exposed at the eastern shoreline. Quaternary glacial deposits are widespread on Store Koldewey. Particularly, on the southernmost tip of the island the bedrock is completely concealed by Quaternary sediments. The morphology on Store Koldewey is dominated by a flat-toped mountain range with an elevation up to 900 m a.s.l. (Fig. 6-1). The west coast is characterized by steep slopes close to the shoreline, whereas the eastern coast is dominated by extended plains with a maximum elevation of 150 m a.s.l. The mountain range is repeatedly interrupted by several U-shaped and west to east oriented valleys, which are partially filled up by freshwater reservoirs of various depths. The lakes are exclusively fed by melt water. Many smaller lakes and ponds exist on the eastern plain in morphological depressions. The climate in the north eastern part of Greenland is characterized by low precipitation (c. 150 mm/a) and low temperatures between -24°C and 4°C (Born & Böcher 2001). The vegetation cover on Store Koldewey is only sparse and dominated by Salix arctica, Dryas octopetala, Cassiope tetragona, Eriophorum, and different lichens and mosses. The local fauna is represented by various birds and a few mammals, e.g., arctic fox, arctic hare, lemmings and polar bears. Geographical Society Ø Geographical Society Ø is located off East Greenland at 72°40’-73°04’ N and 021°52’-24°35’ W (Fig. 6-1). The island is bordered by the Sofia Sund and the Foster Bugt in the north, the Vega Sund in the south, and the Cambridge Bugt in the east. Studies in the past have revealed that major parts of the island were glaciated during the LGM and that the ice retreat in the Vega Sund occurred after c. 11-10 ka BP (Wagner et al. 2000). Findings of pre-Holocene shell materials on the north eastern part of the island (Funder & Hjort 1973, Hjort 1981) suggest that this part was not or not heavily glaciated during the LGM. However, glacial reworking and redeposition cannot be excluded. The western part of Geographical Society Ø is composed of Upper Paleozoic sediments while the eastern part is built up by Mesozoic sediments. Tertiary volcanic
units are widespread in the sediments. Patches of unconsolidated marine Cenozoic sediments occur on the low-altitude regions of the island. In the southern and eastern parts the landscape is characterized by a hilly topography, whilst the mountains in the western part of the island have a maximum altitude of 1700 m a.s.l. The climatic conditions differ from those on Store Koldewey not much. The precipitation increases to c. 300 mm/a (Reeh 1989), and little warmer temperatures enable, for example, the growth of Betula nana on the Geographical Society Ø. Musk oxes are relatively common on Geographical Society Ø. 6.1 Lake Hydrology Bernd Wagner During the field season a total of 12 lakes and ponds on Store Koldewey and Geographical Society Ø was investigated in order to characterize their hydrological properties (Fig. 6.1-1). Fig. 6.1-1: Maps of Store Koldewey (left) and eastern Geographical Society Ø (top), showing the location of the lakes studied during the field season 2003. The contour intervals are given in 100 m for Store Koldewey and in 300 m for Geographical Society Ø. 53
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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 12 and 13: 10 northerly wind increased steadil
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 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 68 and 69: 66 depth horizon description sample
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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