noaa-recon-12037
Torneträsk Tree Ring MXD Temperature Reconstruction AD 500-2004
Grudd, H.
Torneträsk Tree Ring MXD Temperature Reconstruction AD 500-2004
2010-04-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12037
Investigator
H.
Grudd
earth science
paleoclimate
climate reconstructions|tree ring
age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null
earth science
paleoclimate
climate reconstructions|tree ring
temperature,ring density,null,degree Celsius,null,climate reconstructions|tree ring,anomalized,null,N,based on latewood density; deviation from 1951-70 mean
earth science
paleoclimate
climate reconstructions|tree ring
temperature,ring density,null,degree Celsius,null,climate reconstructions|tree ring,anomalized|filtered,null,N,based on latewood density; deviation from 1951-70 mean; 30-year filtered
earth science
paleoclimate
climate reconstructions|tree ring
temperature,ring density,null,degree Celsius,null,climate reconstructions|tree ring,null,null,N,based on latewood density
earth science
paleoclimate
tree ring
tree ring standardized growth index,null,null,null,null,tree ring,composited,null,N,null
earth science
paleoclimate
climate reconstructions|tree ring
temperature,ring density,null,degree Celsius,null,climate reconstructions|tree ring,anomalized|filtered,null,N,based on latewood density; deviation from 1951-70 mean; 100-year filtered
earth science
paleoclimate
reconstructions
air temperature
geoscientificInformation
Air Temperature Reconstruction
PAGES 2k Network
PAGES Arctic 2k
500 AD
2004 AD
1450 cal yr BP
-54 cal yr BP
Complete
68.21
68.31
19.45
19.8
400
400
Continent
Europe
Northern Europe
Scandanavia
Sweden
Torneträsk>LATITUDE 68.25>LONGITUDE 19.6
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Grudd, H. 2008.
Torneträsk tree-ring width and density AD 500-2004:
a test of climatic sensitivity and a new 1500-year reconstruction
of north Fennoscandian summers.
Climate Dynamics, Vol. 31, pp. 843-857.
DOI:10.1007/s00382-007-0358-2
This paper presents updated tree-ring width (TRW) and maximum density (MXD)
from Torneträsk in northern Sweden, now covering the period AD 500-2004.
By including data from relatively young trees for the most recent period,
a previously noted decline in recent MXD is eliminated. Non-climatological
growth trends in the data are removed using Regional Curve Standardization
(RCS), thus producing TRW and MXD chronologies with preserved low-frequency
variability. The chronologies are calibrated using local and regional
instrumental climate records. A boot-strapped response function analysis
using regional climate data shows that tree growth is forced by April-August
temperatures and that the regression weights for MXD are much stronger than
for TRW. The robustness of the reconstruction equation is verified by
independent temperature data and shows that 63-64% of the instrumental
inter-annual variation is captured by the tree-ring data. This is a
significant improvement compared to previously published reconstructions
based on tree-ring data from Torneträsk. A divergence phenomenon around
AD 1800, expressed as an increase in TRW that is not paralleled by
temperature and MXD, is most likely an effect of major changes in the
density of the pine population at this northern tree-line site. The bias
introduced by this TRW phenomenon is assessed by producing a summer
temperature reconstruction based on MXD exclusively. The new data show
generally higher temperature estimates than previous reconstructions
based on Torneträsk tree-ring data. The late-twentieth century, however,
is not exceptionally warm in the new record: On decadal-to-centennial
timescales, periods around AD 750, 1000, 1400, and 1750 were equally warm,
or warmer. The 200-year long warm period centered on AD 1000 was
significantly warmer than the late-twentieth century (p < 0.05) and is
supported by other local and regional paleoclimate data. The new tree-ring
evidence from Torneträsk suggests that this "Medieval Warm Period" in
northern Fennoscandia was much warmer than previously recognized.
STUDY NOTES: Tree ring maximum density temperature reconstruction for AD 500-2004,
based on a total of 100 pine trees from Torneträsk in northern Sweden.
Sample materials cover the period AD 441–2004. Dry dead wood covers
the period AD 441–1789 and living trees cover the period AD 1336–2004.
No subfossil lake material is included in the MXD data.
Torneträsk area, northern Sweden (68.21-68.31°N, 19.45-19.80°E,
350-450 m a.s.l.).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask-temperature2008.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/sweden/tornetrask-temperature2008.xls
USA/NOAA
DIF
Version 9.8.4
2019-03-01
2019-03-01