Summer temperature variations in southern Kamchatka as reconstructed from a 247-year tree-ring chronology of Betula ermanii

ABSTRACTAdvances in accelerator mass spectrometry have resulted in an unprecedented amount of new high-precision radiocarbon (14C) -dates, some of which will redefine the international 14C calibration curves (IntCal and SHCal). Often these datasets are unaccompanied by detailed quality insurances in place at the laboratory, questioning whether the 14C structure is real, a result of a laboratory variation or measurement-scatter. A handful of intercomparison studies attempt to elucidate laboratory offsets but may fail to identify measurement-scatter and are often financially constrained. Here we introduce a protocol, called Quality Dating, implemented at ETH-Zürich to ensure reproducible and accurate high-precision 14C-dates. The protocol highlights the importance of the continuous measurements and evaluation of blanks, standards, references and replicates. This protocol is tested on an absolutely dated German Late Glacial tree-ring chronology, part of which is intercompared with the Curt Engelhorn-Center for Archaeometry, Mannheim, Germany (CEZA). The combined dataset contains 170 highly resolved, highly precise 14C-dates that supplement three decadal dates spanning 280 cal. years in IntCal, and provides detailed 14C structure for this interval.

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Tree-Ring Chronology in American Prehistory

Nature ◽

10.1038/138315a0 ◽

1936 ◽

Vol 138 (3486) ◽

pp. 315-316

Keyword(s):

Tree Ring ◽

Tree Ring Chronology

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The Impact of Morphological Features on Summer Temperature Variations on the Example of Two Residential Neighborhoods in Ljubljana, Slovenia

Sustainability ◽

10.3390/su9010122 ◽

2017 ◽

Vol 9 (1) ◽

pp. 122 ◽

Cited By ~ 6

Author(s):

Alenka Fikfak ◽

Saja Kosanović ◽

Miha Konjar ◽

Janez Grom ◽

Martina Zbašnik-Senegačnik

Keyword(s):

Summer Temperature ◽

Morphological Features ◽

Temperature Variations ◽

The Impact

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Four Centuries of Summer Temperature Changes in Tierra Del Fuego: Atmospheric Drivers and Tree-Ring Reconstruction From the Southernmost Forests of the World

10.21203/rs.3.rs-373205/v1 ◽

2021 ◽

Author(s):

Vladimir Matskovsky ◽

Fidel A. Roig ◽

Mauricio Fuentes ◽

Irina Korneva ◽

Diego Araneo ◽

...

Keyword(s):

Tree Ring ◽

Ring Width ◽

Temperature Reconstruction ◽

Summer Temperature ◽

Temperature Variability ◽

Tierra Del Fuego ◽

Climate Modelling ◽

Least Squares Regression ◽

Nothofagus Pumilio ◽

The World

Abstract Proxy climate records, such as those derived from tree rings, are necessary to extend relatively short instrumental meteorological observations into the past. Tierra del Fuego is the most austral territory with forests in the world, situated close to the Antarctic Peninsula, which makes this region especially interesting for paleoclimatic research. However, high-quality, high-resolution summer temperature reconstruction are lacking in the region. In this study we used 63 tree-ring width chronologies of Nothofagus pumilio and Nothofagus betuloides and partial least squares regression (PLSR) to produce annually resolved December-to-February temperature reconstruction since AD 1600 which explains up to 65% of instrumental temperature variability. We also found that observed summer temperature variability in Tierra del Fuego is primarily driven by the fluctuations of atmospheric pressure systems both in the South Atlantic and South Pacific, while it is insignificantly correlated to major hemispheric modes: ENSO and SAM. This fact makes our reconstruction important for climate modelling experiments, as it represents specific regional variability. Our reconstruction can be used for direct comparison with model outputs to better understand model limitations or to tune a model or contribute to larger scale reconstructions based on paleoclimatic data assimilation. Moreover, we showed that PLSR has improved performance over principal component regression (PCR) in the case of multiple tree-ring predictors. According to these results, PLSR may be a preferable method over PCR for the use in automated tree-ring based reconstruction approaches, akin widely used point-by-point regression.

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