Baggensfjärden Bay
The core-to-core correlation in this bay is based on radiographs of six sediment cores: cores 893-895 sampled on 1 March 1983 and cores 994-996 sampled on March 13 1984. For location see the map below.
Coring sites in the southern part of Baggensfjärden between Baggensudden and Baggensnäs (Kålnäsudd).
Core 995 had the lowest hardness index (1.0) of the six sediment cores and core 994 the highest (1.3). Three of the (28) radiographs of these cores are shown below.
Radiographic comparison between the upper part of cores 894 and 995 from a depth of 53 and 54 m respectively in Baggensfjärden.
The length of these two gas-rich cores increased by 3 cm in about twenty-four hours after sampling, due to the formation and expansion of gas bubbles (the dark, more or less round or elliptical spots on the radiographs).
Downcore variation in dry bulk density and calculated annual mass sedimentation rate in kg/m2 for the upper part of sediment core 894 ( compare with the left radiograph above).
At coring site 894 and for the period 1960-1983 the calculated annual mean and median rate of sedimentation amounted to 1.15 and 0.90 kg of solids/m2 and to 9 and 8 mm respectively. At this coring site the content of solids in the 20 mm thick layer, probably formed in the sedimentological year 1964, amounted to 3.5 kg/m2. In the upper 0.2 m of sediment core 894 the mean value of the loss on ignition was 12.8 % of the dry weight.
The salinity, the density , and the pH of the bottom water in the coring tube on top of core 894 was 6.42 ‰, 1.005 and 7.02 respectively.
Radiograph of the central part of sediment core 994 from a depth (during coring) of 49.5 m in Baggensfjärden. ( The lead letters O and X were used for marking corresponding levels on the partly overlapping radiographs).
At this coring site the border between the lower bioturbated and the upper laminated deposits, shown by the radiograph above, was in March 1984 situated at a sediment depth of 25 cm, probably formed in 1951, and indicating a transition from more or less oxic to anoxic conditions in the bottom water.
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