Jökull - 01.12.1963, Side 19

90-
so-
70-
ppm HCOj 60~
50-
40-
30-
ppm SOi
ppm Na
ppm S1O2
-----Á---- Fúlilœkur f
-----o----Skálm /
JAN ' FEB. ' MAR. ’ APR. ' MAY ' JUN. ' JUL. AUG. SEP ' OCT. " NOV. DEC.
Fig. 2. Concentration/time variation diagram for the three rivers.
increase in discharge. The total dissolved loacl
in Fúlilœkur on the other hancl increases con-
siderably during the winter months. This in-
crease is probably greater than can be accounted
for by decrease in water discharge. Variations
in pH and bicaibonate in Fúlilœkur is much
more pronounced than in the other rivers. Tlie
lower pH during the winter months, due to
higher dissociation of carbonic acid at low
temperature is probablv effectice in producing
the higher total dissolved load, but here a source
of COo must be assumed, which is either not
present in the other rivers or masked by airation
and precipitation of calciumcarbonate.
Fig. 2 shows a simple concentration/time
variation diagram for some of the analysed com-
JÖKULL 1963
TABLE5
Approximate discharge and total dissolved loacl
in the river Skálm.
Date Approx. disch. m3/sec. Dissolved solids, ppm Total diss. load g/sec.
15.1. ’63 16 81 1296
10.3. ’63 16 76 1216
23.4. ’63 20 78 1560
3.7. ’63 26 82 2132
1.10. ’63 20 75 1500
14.12. ’63 26 126 3276
15