Rit (Vísindafélag Íslendinga) - 01.06.1976, Side 48

Table 4.
Annual weighted mean ÖD and the total annual precipitation for
each measured year at the three meteorological stations
Rjúpnahæð, Hveravellir and Vegatunga.
Rjúpnahæð
Year 1958 1959 1960 1961 1962 1963 1964 1965
Deuterium concentration 8D%0 -54.3 -65.9 -55.9 -59.0 -56.6 -55.8 -55.3 -57.3
Precipitation mm 783 1316 890 917 916 860 986 710
Hveravellir
Year 1966 1967 1968 1969
Deuterium concentration 8d%0 -82.3 -86.1 -83.4 -91.0
Precipitation mm 433 754 761 799
Vegatunga
Year 1963 1964 1969
Deuterium concentration 8D%0 -57.9 -58.6 -52.5
Precipitation mm 906 1294 1309
RjúpnahæS and Hveravellir. The mean values for the rate of pre-
cipitation in mm per day and the mean air temperature is also
given in Fig. 8.
No clear correlation between the öD-value and the amount of
precipitation can be found, either by considering Fig. 8 or from
Table 4. Table 4 gives the annual weighted mean ðD-value and the
total annual precipitation for each measured year at the three above
stations. Table 4 shows that the year 1959 at Rjúpnahæð has the
highest precipitation and lowest ðD-value of all the years measured
at this station. The same may appear from Fig. 8, where those
months at Rjúpnahæð with high precipitation also seem to have
precipitation with low 8D-value. On the other hand, the years 1972
at Hveravellir and 1969 at Vegatunga with the highest precipita-
tion also show the highest 8D-value.
Obviously the temperature effect is so seriously blurred hy other
effects such as the amount of precipitation, wind direction, lands-
cape and the origin of the air masses that it does not appear as a
seasonal effect. There also seems to be no correlation hetween the
mean annual temperature and the mean annual deuterium content
44
1970 1971 1972
-86.1 -79.3 -78.6
746 894 947
J