Jökull - 01.12.1993, Page 27

Index 1/100 mm
Figure 5. Plots of the three
Pinus driftwood mean cur-
ves from Reykjanes, Strand-
ir and Langanes. — Meðal-
tal árhringja í rekavið frá
Reykjanesi, Ströndum og
Langanesi.
1800 1850 1900
YearAD
1950 2000
Figure 6. Pinus driftwood
mean curve from Iceland
(Iceland 1; thick line) and
a master chronology curve
from Yenisey in Siberia
(thin line). — Meðaltal
árhringja í rekavið (furu)frá
Islandi(Iceland 1; þykk lína)
og grunngildi frá Yenisey í
Síberíu (mjó lína).
nus (Iceland 1 in Table 3). For Strandir (Figure 1;B
Table 4) 14 Pinus samples could be matched with the
undated Pinus curve from site C, 38% of the total
■Strandir Pinus samples and forReykjanes (Figure 1;A
Table 4), 20 Pinus samples, 63% of the total Reykja-
nes Pinus samples. Figure 5 shows the plots of the
Pinus driftwood mean curves from the different sam-
pling localities in Iceland, indicating a high correlation
between the curves.
To summarise, from a total of 126 Pinus samples
collected on Iceland, 54% of the total Pinus samples
could be matched, which allows the conclusion to be
drawn that they originate from roughly the same area.
The attempt to date the driftwood tree-ring curve
from site C (Iceland 1), with chronologies available
from the boreal forests of western Russia, was not suc-
cessful. This means that the logs making up this curve
do not originate in the White Sea - Petchora region,
from where there is a good network of chronologies
available. However, a comparison with a Pinus mas-
ter chronology from the middle reaches of the Yenisey
river in Siberia (situated at 61 °N, 90° E; Figure 2) (Eu-
gene Vaganov, pers. comm. 1994) dated it, correlation
values, t = 6.3; Sign test 65.1%, giving theend year of
1973 (Figure 6).
Only one of the Pinus samples from the Scoresby
Sund collection in Greenland (Figure 1;D Table 4)
could be matched with the dated curve from site C.
However, the majority of Pinus samples from northern
Svalbard (Eggertsson 1994b) and Jan Mayen (Stein
Johansen, pers. comm. 1993) also fit the curve from
site C.
Additionally, 9 other Pinus samples from collec-
tions B and C (Figure 1) could be matched, resulting in
a mean curve where 5 trees were averaged. This mean
curve (Iceland 2 in Table 3) could be dated through al-
ready established Pinus chronologies from the White
Sea region in Russia, centred around Arkhangelsk (Ta-
ble 2a; Figures 7 and 8) with 1977 as the last year.
Another three Pinus samples from sites B and C could
JÖKULL, No. 43, 1993 25