Jökull - 01.12.1993, Blaðsíða 14

Figure 16. Areas where correlation coefficients be-
tween annual mean temperatures are r > 0.7 using
Thorshavn, Jan Mayen and Angmagssalik as basic sta-
tions. — Svœði meðfylgni milli ársmeðalhita r > 0.7
í veðurstöðvunum í Þórshöfn í Fœreyjum, Jan Mayen
og Angmagssalik.
then to Isfjord radio (r = 0.58). The correlation coeffi-
cients of W-Norway are r = 0.21-0.35, i.e. higher than
the correlation coefficients between Reykjavík and W-
Norway. On the other hand the correlation coefficients
between W-Greenland (Jakobshavn, Godthaab/Nuuk)
andReykjavík, are r = 0.35-0.47 but only r = 0.13-0.19
for Grímsey.
The area where r > 0.7 for Grímsey (Figure 15)
covers a similar region as shown in Figure 14 for
ReykjavíT as a basis station (for the same correla-
tion coefficient); i.e. most of the region from Grímsey
towards east and to Jan Mayen is common on both
maps. The line for r = 0.9 circumscribes a rather small
area, over NE-Iceland and probably over the polar
sea where it reaches Hornstrandir in west, and the E-
Iceland ocean current. This seems to be a good exam-
ple of more than one type of, for instance, the six main
weather types defined by the author (1991). A map
showing correlation coefficients where Teigarhorn is
the basic station, shows an area with r > 0.7 which
is rather similar to the Grímsey-map, but extending
slightly more towards east.
Figure 16 shows three lines delineating areas
where r > 0.7 for the weather stations Angmagssalik,
Jan Mayen and Thorshavn used as basic stations. The
area for Angmagssalik covers Iceland, Greenland Sea
and SE-Greenland. The Jan Mayen area includes NE-
and E-Iceland, and the cold ocean currents. Finally the
Thorshavn area reaches E-Iceland, probably due to the
influence ofthe easterly winds. It is interesting that the
area with r > 0.7 surrounding Angmagssalik, and the
similar area within r > 0.7 around Reykjavík (Figure
14) overlap. The two regions overlap, which perhaps
could indicate the same classified main weather types.
CONCLUSIONS
Monthly and annual temperatures during the pe-
riod 1901-1990 reveal a general relationhip between
temperature conditions in Iceland and the North-
Atlantic region. Temperature conditions in Iceland
relate closely to a region east of the country, and to-
wards west or southwest over the Greenland Sea and
to SW-Greenland.
Extreme annual mean temperatures in Iceland (5
waimest/coldest annual temperatures 1901-1990) are
also felt as such in an area that includes Iceland, ex-
tends partly towards the coast of W-Norway, covers the
Greenland Sea and a part of the coast of the southern
part of Greenland.
The two very cold periods in this century, (the
first one during the two first decades and the second
during the period 1965-1971) occurred almost simul-
taneously in Iceland as in a region extending towards
west and north, to the southwest coast of W-Greenland.
There is a close relationship between temperature con-
ditions in Iceland and Thorshavn but very little with
W-Norway. In between the two very cold periods, a
cold period, 1940-1943 is seen in the northernmost
stations of Norwegian Sea (Björnöya, Isfjordradio) or
1940-1942 on the west coast of Norway. This cold pe-
riod is confined to that region and not found in Iceland
or Thorshavn.
12 JÖKULL, No. 43, 1993