scholarly journals Using Annual Resolution Pollen Analysis to Synchronize Varve and Tree-Ring Records

Quaternary ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 23 ◽  
Author(s):  
Martin Theuerkauf ◽  
Eike Engelbrecht ◽  
Nadine Dräger ◽  
Michael Hupfer ◽  
Almut Mrotzek ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Tree Ring ◽  
Fagus Sylvatica ◽  
Pollen Analysis ◽  
Fossil Wood ◽  
Pollen Deposition ◽  
Pollen Monitoring ◽  
Varved Lake Sediments ◽  
Cross Dating ◽  
Annual Resolution

Fossil wood and varved lake sediments allow proxy analysis with exceptionally high, (sub-)annual resolution. Both archives provide dating through ring and layer counting, yet with different accuracy. In wood, counting errors are small and can be eliminated through cross-dating because tree-rings show regionally synchronous patterns. In varved sediments, counting errors are larger and cross-dating is hampered by missing regional patterns in varve parameters. Here, we test whether annual pollen analysis is suited to synchronize varve records. To that end, annual pollen deposition was estimated in three short cores from two lakes in north-eastern Germany for the period 1980–2017 CE. Analysis has focused on Fagus sylvatica and Picea abies, which show the strongest annual variations in flowering (mast). For both tree taxa, annual flowering variations recorded by forest and pollen monitoring are well represented in varved lake sediments, hence indeed allow us to synchronize the records. Some pollen mast events were not recognized, which may relate to sampling uncertainties, redeposition or regional variations in flowering. In Fagus sylvatica, intense flowering limits wood growth in the same year. Peaks in pollen deposition hence correlate with minima in tree-ring width, which provides a link between varved lake sediments and fossil wood.

scholarly journals Cross-dating tree-ring series of living European beech by isochronic weather records

2016 ◽  
Vol 43 (1) ◽  
pp. 48-58
Author(s):  
Denisa Sedmáková ◽  
Róbert Sedmák ◽  
Michal Bosel’a ◽  
Marek Ježík ◽  
Roman Sitko ◽  
...  
Keyword(s):  
Tree Ring ◽  
Fagus Sylvatica ◽  
Ring Width ◽  
Main Idea ◽  
European Beech ◽  
Combined Method ◽  
Good Ability ◽  
The Cross ◽  
Width Measurements ◽  
Cross Dating

Abstract The main objective of the study is to facilitate cross-dating of sensitive tree-ring series from living European beech (Fagus sylvatica L.) trees in the absence of a regional chronology. The main idea lies in the preliminary dating of marker rings or ring patterns visually identified on the wood (before the ring-width measurements), which is independently validated through a moving correlation between a tentative reference chronology and instrumental climate records (after the ring-width measurements). Following the detection of low moving correlations, potentially misdated segments or series are re-examined and a new tentative reference chronology is constructed. The process is repeated as long as a higher correlation with climate is obtainable. The applicability of this method was investigated on three difficult-to-date sets of tree-ring series of beech trees which were growing at temperature- or precipitation-sensitive locations in under-canopy or canopy positions. A good ability of the combined method for the cross-dating was practiced on datasets almost impossible to cross-date by commonly used approaches. Highlighting the actual correlation of ring widths with climate in tree-ring series makes the cross-dating process more independent from human decisions, so the com-bined cross-dating has the potential to improve the reliability of various dendrochronological studies.

A Chronology of Upper Willamette Valley, Oregon, Prehistory

1979 ◽  
Vol 44 (3) ◽  
pp. 556-568
Author(s):  
John R. White
Keyword(s):  
Tree Ring ◽  
Pollen Analysis ◽  
Radiocarbon Dating ◽  
Willamette Valley ◽  
Historic Period ◽  
Relative Dating ◽  
Cross Dating

On the basis of an analysis of data from 34 of the most thoroughly examined sites in the Upper Willamette Valley of Oregon, a chronological framework is devised that divides the prehistory of the region into five major periods: Period I, ranging between 8000 and 6000 B.C.; Period II, between 6000 and 4000 B.C.; Period III, between 4000 and 250 B.C.; Period IV, 250 B.C. to A.D. 1700; and Period V, the protohistoric and historic period dating between 1700 and approximately 1850. The bracketing dates for these periods are based on a combination of chronometric and relative dating techniques, including radiocarbon dating, tree-ring counts, typological comparison, pollen analysis, cross-dating with historic artifacts, and stratigraphy.

Bioclimatology of beech (Fagus sylvatica L.) in the Eastern Alps: spatial and altitudinal climatic signals identified through a tree-ring network

2007 ◽  
Vol 34 (11) ◽  
pp. 1873-1892 ◽  
Author(s):  
Alfredo Di Filippo ◽  
Franco Biondi ◽  
Katarina Čufar ◽  
Martín de Luis ◽  
Michael Grabner ◽  
...  
Keyword(s):  
Tree Ring ◽  
Fagus Sylvatica ◽  
Eastern Alps ◽  
Ring Network ◽  
Fagus Sylvatica L ◽  
Climatic Signals

scholarly journals Linking pollen deposition and snow accumulation on the Alto dell'Ortles glacier (South Tyrol, Italy) for sub-seasonal dating of a firn temperate core

2017 ◽  
Vol 11 (2) ◽  
pp. 937-948 ◽  
Author(s):  
Daniela Festi ◽  
Luca Carturan ◽  
Werner Kofler ◽  
Giancarlo dalla Fontana ◽  
Fabrizio de Blasi ◽  
...  
Keyword(s):  
Airborne Pollen ◽  
Ice Cores ◽  
Snow Accumulation ◽  
Balance Model ◽  
Pollen Deposition ◽  
Layer Formation ◽  
Italian Alps ◽  
Pollen Monitoring ◽  
Pollen Content ◽  
Firn Core

Abstract. Dating of ice cores from temperate non-polar glaciers is challenging and often problematic. However, a proper timescale is essential for a correct interpretation of the proxies measured in the cores. Here, we introduce a new method developed to obtain a sub-seasonal timescale relying on statistically measured similarities between pollen spectra obtained from core samples and daily airborne pollen monitoring samples collected in the same area. This approach was developed on a 10 m core retrieved from the temperate-firn portion of Alto dell'Ortles glacier (Eastern Italian Alps), for which a 5-year annual/seasonal timescale already exists. The aim was to considerably improve this timescale, reaching the highest possible temporal resolution and testing the efficiency and limits of pollen as a chronological tool. A test of the new timescale was performed by comparing our results to the output (date of layer formation) of the mass balance model EISModel, during the period encompassed by the timescale. The correspondence of the results supports the new sub-seasonal timescale based on pollen analysis. This comparison also allows us to draw important conclusions on the post-depositional effects of meltwater percolation on the pollen content of the firn core as well as on the climatic interpretation of the pollen signal.

scholarly journals VARDA (VArved sediments DAtabase) – providing and connecting proxy data from annually laminated lake sediments

2020 ◽  
Author(s):  
Arne Ramisch ◽  
Alexander Brauser ◽  
Mario Dorn ◽  
Cecile Blanchet ◽  
Brian Brademann ◽  
...  
Keyword(s):  
High Resolution ◽  
Lake Sediments ◽  
Climate Models ◽  
Detailed Comparison ◽  
High Temporal Resolution ◽  
Proxy Data ◽  
Varved Sediments ◽  
Proxy Records ◽  
Data Compilation ◽  
Varved Lake Sediments

Abstract. Varved lake sediments provide long climatic records with high temporal resolution and low associated age uncertainty. Robust and detailed comparison of well-dated and annually laminated sediment records is crucial for reconstructing abrupt and regionally time-transgressive changes as well as validation of spatial and temporal trajectories of past climatic changes. The VARved sediments DAtabase (VARDA) presented here is the first data compilation for varve chronologies and associated palaeoclimatic proxy records. The current version 1.0 allows detailed comparison of published varve records from 95 lakes. VARDA is freely accessible and was created to assess outputs from climate models with high-resolution terrestrial palaeoclimatic proxies. VARDA additionally provides a technical environment that enables to explore the database of varved lake sediments using a connected data-model and can generate a state-of-the-art graphic representation of multi-site comparison. This allows to reassess existing chronologies and tephra events to synchronize and compare even distant varved lake records. Furthermore, the present version of VARDA permits to explore varve thickness data. In this paper, we report in detail on the data mining and compilation strategies for the identification of varved lakes and assimilation of high-resolution chronologies as well as the technical infrastructure of the database. Additional paleoclimate proxy data will be provided in forthcoming updates. The VARDA graph-database and user interface can be accessed online at https://varve.gfz-potsdam.de, all datasets of version 1.0 are available at http://doi.org/10.5880/GFZ.4.3.2019.003 (Ramisch et al., 2019).

scholarly journals A Test of “Annual Resolution” in Stalagmites Using Tree Rings

2002 ◽  
Vol 58 (2) ◽  
pp. 197-199 ◽  
Author(s):  
Julio L. Betancourt ◽  
Henri D. Grissino-Mayer ◽  
Matthew W. Salzer ◽  
Thomas W. Swetnam
Keyword(s):  
New Mexico ◽  
Tree Ring ◽  
Tree Rings ◽  
Late Holocene ◽  
Ice Cores ◽  
Time Interval ◽  
Annual Resolution

AbstractSo-called annual banding has been identified in a number of speleothems in which the number of bands approximates the time interval between successive U-series dates. The apparent annual resolution of speleothem records, however, remains largely untested. Here we statistically compare variations in band thickness from a late Holocene stalagmite in Carlsbad Cavern, Southern New Mexico, USA, with three independent tree-ring chronologies form the same region. We found no correspondence. Although there may be various explanations for the discordance, this limited exercise suggests that banded stalagmites should be held to the same rigorous standards in chronology building and climatic inference as annually resolved tree rings, corals, and ice cores.

A new computer program for estimating the statistical significance of cross-dating positions for "floating" tree-ring series

1992 ◽  
Vol 22 (9) ◽  
pp. 1215-1221 ◽  
Author(s):  
David K. Yamaguchi ◽  
George L. Allen
Keyword(s):  
Tree Ring ◽  
Moving Average ◽  
Statistical Significance ◽  
Control Program ◽  
Fortran Program ◽  
Data Quality Control ◽  
Quality Control Program ◽  
Significance Level ◽  
False Rings ◽  
Cross Dating

CORREL is a FORTRAN program that employs cross correlation to (i) determine potential cross-dating (matching) positions for "floating" (undated) ring series; (ii) detect missing or false rings; and (iii) estimate the statistical significance of potential dating positions. To work properly, CORREL input data must be detrended and modeled using the autoregressive moving average procedure. To guard against spurious dating, the output's best date should be checked for dating consistency. The significance level of the best date is obtained by adjusting its single-dating-trial significance for multiplicity (repeated dating trials). Ideally, COREL should be used with the detrending tree-ring programs ARSTAN or INDEX, and with the data quality-control program COFECHA.

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