Jökull

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Jökull - 01.12.1993, Page 12

Jökull - 01.12.1993, Page 12
Figure 13. 10-year over- lapping means of annual temperature, 1901-1990 in Reykjavík, Grímsey, Godt- haab/Nuuk and Jakobshavn, 1901-1960 in Ivigtut, 1901- 1980inUpernavik. — lOára raðmeðaltöl árshita, 1901- 1990 í Reykjavík, Grímsey, Godthaab/Nuuk og Jakobs- havn, 1901-1960 ílvigtut, en 1901-1980 í Upernavik. tions. The northern stations, Jakobshavn and Uper- navik, show larger variations, starting with a cold period in the beginning of the century and then an increasing temperature with similar trend. Summary ofresults: The main results of the comparison of the 10-year overlapping annual mean temperatures are: The cold period in the first two decades of the cen- tury appears in all parts of the North-Atlantic region. The coldest area seems to be in northwestem Green- land (Jakobshavn, Upernavik) and is clearly also seen in Isfjord radio. In Thorshavn and some weather stations at the coast of W-Norway, temperatures were mild for the first decades and increased then gradually up to 1930/39. In Iceland theperiod 1965-1971 was severely cold, with frequent sea ice along the northern coast. Most of the North-Atlantic region had a cool or cold period at the same time. In W-Greenland (Godthaab/Nuuk, Jakobshavn, Upernavik) the cold weather period came later than in Iceland, with the lowest values in 1967/76. The N-Atlantic cooling seems to have started one year later in Iceland, i.e. 1952/61 in Scores- bysund/Kap Tobin and Angmagssalik, compared to 1953/62 in Grímsey and at Teigarhorn. This also ap- pliesto JanMayen. The minimum occurred in 1965/74 in Angmagssalik, 1964/73 in Jan Mayen and 1962/71 in Scoresbysund/Kap Tobin, which coincides with the minimum in Grímsey and Teigarhorn. The northernmost stations of the Norwegian Sea (Björnöya, Isfjord radio, Hopen) have similar charac- teristics as Scoresbysund/Kap Tobin and Angmagssa- lik as concerns the start of cooling, and similar to Grímsey and Teigarhorn concerning the period of low- est temperatures. In Thorshavn the temperature decreased during 1960/69, but without a further clear cooling trend. This is to some extent characteristic for the weather stations of W-Norway. In the southernmost part of the study area the cooling is hardly seen, and it is re- ally not until 1962/71 that gradual cooling took place in Tromsö and Vardö. CORRELATION OF ANNUAL TEMP- ERATURES 1925-1990 BETWEEN ICE- LANDIC AND OTHER NORTH-ATLAN- TIC WEATHER STATIONS In the former sections relationships have been de- scribed for temperature conditions in Icelandic and North-Atlantic weather stations, based on extreme val- 10 JÖKULL,No. 43, 1993

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Jökull

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Ársrit Jöklarannsóknarfélags Íslands og Jarðfræðafélags Íslands
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Jón Eyþórsson (1952-1967)
Sigurður Þórarinsson (1957-1982)
Guðmundur Pálmason (1965-1976)
Sveinbjörn Björnsson (1967-1976)
Helgi Björnsson (1983-1985)
Leó Kristjánsson (1983-1985)
Ólafur G. Flóvenz (1986-1987)
Tómas Jóhannesson (1988-1989)
Helgi Björnsson (1990-1993)
Leó Kristjánsson (1990-1993)
Áslaug Geirsdóttir (1994-2007)
Tómas Jóhannesson (1998-1998)
Bryndís Brandsdóttir (1998-2007)
Halldór Gíslason (2002-2003)
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Freysteinn Sigmundsson (2008-2008)
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Ívar Örn Benediktsson (2012-2012)
Helgi Björnsson (2012-2012)
Guðrún Larsen (2012-2012)
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