Scottish geographical magazine . February the current becomes unsteady, but the actualchange from the inward to the outward direction takes place on the 4thof the month at the surface, and twenty-four hours later at a depth of7*5 mtitres (see the table). From this day forth we must concentrateour attention chiefly on the state of the deep Avater. It seems at firstquite inexplicable that the Baltic water does not daily increase in thick-ness there as at Trindelen and the Skaw. We should expect to findBaltic water of low salinity at 157 and 20 metres on the 6th or 7th;but instead of decrease of
Scottish geographical magazine . February the current becomes unsteady, but the actualchange from the inward to the outward direction takes place on the 4thof the month at the surface, and twenty-four hours later at a depth of7*5 mtitres (see the table). From this day forth we must concentrateour attention chiefly on the state of the deep Avater. It seems at firstquite inexplicable that the Baltic water does not daily increase in thick-ness there as at Trindelen and the Skaw. We should expect to findBaltic water of low salinity at 157 and 20 metres on the 6th or 7th;but instead of decrease of salinity and temperature the table gives thefollowinEf numbers :— Feb. 5, at 20 metres,„ 6, „ ... „ 8, „ ... q,, .-7, ,, ... This fact is due to the reaction of the upper outflowing sheet of waterupon the lower Avater to the north of L?eso channel in the vicinity of theSkaw, This deep salt water is drawn into the channel as an under- 32-S/^, 33-2 „ ,, = 4-5 33-4 „ „ = 4-6 340 „ ,, = 4-7 34-1 „ ,, = 4-9. current of opposite direction (Elcmans reaction-current) by the frictionof the upper layer upon the adjacent underlying water particles whichare swept away northwards with the surface water, Avhile water from thebottom layers to the north of the channel is drawn inwards and upwardsto fill their place, as is shown by the arrows in our diagram. Thus—and only thus—can it be explained how the salinity and the temperature,15 and 20 metres below the lightship, steadily increase from the 5th tothe 9th February. Then a new complication arises. According to the table the velocity of the outflowing water at thesurface increased considerably from the 9th to the 15th. At the sametime the salinity and temperature at a depth of 20 metres began todecrease as follows :— Feb. 10, at 20 metres,„ 11,)) 2) ), 34-07,34-1 „33-9 „ 4-84-8°4-7° 32-67oc t. 4-5° 2S-5 „ )» 5-5° 28-9 „ )) 3-0° A REVIEW OF SWEDISH HYDROGRAPHIC RESEARCH. 425 Feb. 13, at 20 metr
Size: 2275px × 1098px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeography, bookyear18
