ödsmäl, Kville sn, Bohuslän Hällristning Rock carving Fiskare frân Bronze age bronsåldern fishermen

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ödsmäl, Kville sn, Bohuslän Hällristning Rock carving Fiskare frân Bronze age bronsåldern fishermen

MEDDELANDE från

HAVSFISKELABORATORIET - LYSEKIL 1219

Hydrografiska av/delningen, Göteborg

Observations along the Swedish coast and in the Deep Basins in the Baltic, 1976.

Hydrography of the Kattegat and the

Skagerrak Area, Swedish Observations, 1976.

(Contribution to ICES "Annales Biologiques") by Stig Fonselius and Artur Svansson

J.uly 1977

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Hydrography of the Kattegat and the Skagerrak Area 1976..

In the Figures 2 and 3 results of daily measurements at Bornö station in the Gullmar Fiord (Fig. 1) are presented as deviations in temperature and salinity from the mean values 1931 - 1960.

Temperature, salinity and total phosphorus were measured at a position N 58° 17', E 11° 02' at 10 depths. Data will be published during 1976.

The Skagerrak Deep (M 6) was visited 3 times (Table 1).

Deep salinity and oxygen increased from February to June indicating a certain renewal of water (of Ljjzien and

Svansson 1972).

Table 2 shows the oxygen saturation values at station Fladen in l\l Kattegat. The deep minimum occured in August, which is rather early but values were really low also in December.

Since August 197A there is a project of determining trans­

ports of water and matter through a section Frederikshavn - Göteborg. The measuring activity was particularly frequent during the international project JOIMSDAP 76 in March and April. In connection with this project total phosphorus was measured once a day at the Danish lightvessel Läsö Trindel, simultaneously with the ordinary hydrographic work. Table 3 presents monthly means.

Reference:

Ljban, R. and Svansson, A., 1972: Long-term variations of subsurface temperatures in the Skagerrak. Deep-Sea Research, U. 19, 277-288.

Artur Svansson

Table 1

M 6 58 010'N 09 °30'E

Depth Temp. S °2

m °C ^"U ml/1

February 18

200 7.64 35.112 6.09

300 6.66 35.133 6.09

400 6.34 35.129 6.04

500 6.14 35.122 6.11

600 6.02 35.122 6.09

June 22

200 6.43 35.080 6.36

300 6.06 35.120 6.56

400 5.96 35.142 6.80

500 6.00 35.169 6.95

600 6.04 35.194 6.94

September 14

200 6.40 35.139 6.02

300 6.12 35. 134 6.24

400 5.94 35. 144 6.56

500 5.98 35.166 6.61

600 6.03 35.169 6.65

P e rc e n ta g e O x y g e n S a tu ra ti o n a t 5 7 °1 1 .5 '( \l 1 1 °4 0 'E (F la d e n 0 „ % )

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B O R N O 197 6 T e mp e ra tu re D e v ia ti o n s

B O R N O 1 9 7 6 S al in it y D ev ia ti o n s

Observations along the Swedish coast and in the deep basins of the Baltic 1976 Because our department has been moving to a new laboratory building, the coast guard data have not yet been processed and therefore these have not been used in the present paper*

As has been shown in the previous report (Engström and Fonselius 1977)» an inflow of new water begun during the winter 1975-1976. In May the new water had entered into the Gotland basin, renewing the deep water there. The oxygen con­

centration at 240 m was found to be 1,06 ml/l. The oxygen values decreased again fast and in August hydrogen sulfide was found close to the bottom. Also in Novem­

ber hydrogen sulfide was found in the sampler closest to the bottom, but at the other depths there was still around 0.5 ml/l oxygen.

The ne?/ water reached the Landsort Deep sometimes during the summer. In Sep­

tember the oxygen conditions in the deep water had improved. At 44C m the oxygen value had increased from 0,04 ml/l in June to 0,21 ml/l. In December the oxygen value had still increased to 0.61 ml/l.

In the Arkona basin an unusually high salinity (20,5 1 °°) was found at 49 m in December* In August the salinity at 46 m was 17.1$°, The oxygen at the corres­

ponding depths had increased from 2.58 ml/l to 5.56 ml/l during the same period.

This indicates the beginning of a new inflow of salt water. Unfortunately the Bornholm basin was visited in the beginning of the expedition in November and not in December, Therefore it is not possible to tell if the observed new in­

flow had penetrated into the Bornholm basin and also not if it is large enough to influence the conditions in the central Baltic,

The figures 1, 2, 5 and. 4 show the oxygen and hydrogen sulfide conditions in the deep areas of the Baltic during 1976« Prom these it can be seen that there was hydrogen sulfide only in the eastern Gotland basin in March and that it had disappeared from the Gotland Deep, but not from the Pårö Deep in June, In August- September hydrogen sulfide was again found both in the Gotland Deep and the Pårö Deep and also in the northern Central Basin, In November-December the hydrogen

sulfide had disappeared from the Pårö Deep, but instead hydrogen sulfide was founc in the Norrköping Deep, indicating decreasing oxygen values in the western

Gotland basin.

References

Engström S* and S, Ponselius, 1977 s Observations along the Swedish coast and in the deep basins of the Baltic 1975# Ann, Biolog, Toi, XXXII, 1975#

Sven G, Engström Stig H, Ponselius

National Board of Fisheries Hydrographic Department Pack

S -405 10 Göteborg, Sweden

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