Fróðskaparrit - 01.01.1998, Blaðsíða 309

315
Environmental Conditions on the SW
Iceland Shelf over the Last 500 Years
Umhvørvisumstøður í útsynningspartinum á íslendska
landgrunninum tey seinastu 500 árini
Anne E. Jennings1, Sveinung Hagen2, Astrid E.J. Ogilvie3, Jorunn Hardardottir4
and Ruediger Stein5
1: Campus Box 450, INSTAAR, University of Colorado, Boulder, CO 80309-0450
phone 303-492-7621, fax. 303-492-6388, email: jenninga@spot.colorado.edu
2: Institute of Biology and Geology, University of Tromsø, 9037 Tromsø, Norway
3: Campus Box 450, INSTAAR, University of Colorado, Boulder, CO 80309-0450
4: Campus Box 450, INSTAAR, University of Colorado, Boulder, CO 80309-0450
5: Alfred-Wegener-Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Úrtak
Umhvørvisbroytingar frá 1400 til 1993 vórðu greinaðar
við at brúka royndir úr einum kassakjama, sum varð
tikin upp úr útsynningspartinum á íslendska land-
grunninum. Lívrunnið kolevni, støðug C og O istotop-
lutføll, foraminiferal savnan og áløgumagnetisk para-
metur vórðu máld móti royndum úr kjarnanum. Hetta
tilfar varð plottað móti kalendaraárum og samanborið
við vísitalvur yvir havís úr Islandi. Smáar, men reglu-
fastar, broytingar í hesum proxies vórðu tulkaðar á tann
hátt, at tær vístu økt jarðarslit í Islandi, minni gróður í
havinum og minkað saltinnihald f sambandi við, at
sjógvurin flutti seg suðureftir millum umleið 1790 og
1920.
Extended abstract
Multiple environmental proxies were mea-
sured on a 54 cm long box core taken from
the SW Iceland shelf in 1993 during cruise
93030 of the Canadian ship, CSS Hudson.
The core was raised from Jokuldjúp, a
basin on the shelf where sediments from
the last deglaciation to the present are pre-
served in a 20-m thick sequence. Our inter-
est in analysing the core was in recovering
a detailed record of environmental condi-
tions during the last several centuries. The
site is under the influence of the Irminger
Current, which carries warm, saline At-
lantic water northward along the shelf. Be-
cause of the warmth of this current, sea ice
has rarely been observed in this area, even
during the most severe sea-ice intervals of
the historical record.
The chronology of the core was estab-
Fróðskaparrit 46. bók 1998: 315-316