Review and test of reproducibility of subdecadal resolution palaeoenvironmental reconstructions from microfossil assemblages

Telford, Richard J.

doi:10.31233/osf.io/cpgqk

Cited by 8 publications

(9 citation statements)

References 68 publications

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“…These two approaches are referred to as "calibration in time" and "calibration in space, " respectively. Uncertainties reported for paleotemperatures based on calibration-in-time procedures are typically relatively small because the method is tuned to reconstruct temperature variability at a single site, although this characterization does not represent all potential uncertainties 577 . In contrast, uncertainties typically reported for calibration-in-space procedures are usually characterized by larger but more globally applicable uncertainties, as the proxy-environment relation is examined over a wide environmental gradient.…”

Section: Usage Notesmentioning

confidence: 99%

A global database of Holocene paleotemperature records

et al. 2020

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et al. # a comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved at sub-millennial scale (median spacing of 400 years or finer) and have at least one age control point every 3000 years, with cutoff values slackened in datasparse regions. The data derive from lake sediment (51%), marine sediment (31%), peat (11%), glacier ice (3%), and other natural archives. The database contains 1319 records, including 157 from the Southern Hemisphere. the multi-proxy database comprises paleotemperature time series based on ecological assemblages, as well as biophysical and geochemical indicators that reflect mean annual or seasonal temperatures, as encoded in the database. This database can be used to reconstruct the spatiotemporal evolution of Holocene temperature at global to regional scales, and is publicly available in Linked Paleo Data (LiPD) format.

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Section: Usage Notesmentioning

confidence: 99%

A global database of Holocene paleotemperature records

et al. 2020

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“…The transfer function was then applied to a short core collected from Indico. The significance of the transfer function reconstruction was tested using the ‘randomTF’ function in palaeoSig (Telford, ). The reconstruction results were validated against plant macrofossil data from the same core, and plant macrofossil‐based WTD reconstruction was also processed for easily visible comparison based on Väliranta et al .…”

Section: Methodsmentioning

confidence: 94%

Testate amoeba as palaeohydrological indicators in the permafrost peatlands of north‐east European Russia and Finnish Lapland

Zhang

Amesbury

Ronkainen

et al. 2017

J Quaternary Science

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To explore the use of testate amoeba for investigating the impacts of climate change on permafrost peatland hydrology, we established a new modern training set from Arctic permafrost peatlands in north‐east European Russia and Finnish Lapland. Ordination analyses showed that water‐table depth (WTD) was the most important control on testate amoeba distribution. We developed a new testate amoeba‐based WTD transfer function and thoroughly tested it. We found that our transfer function had strong predictive power. The best‐performing model was based on tolerance‐downweighted weighted averaging with inverse deshrinking (R2 = 0.77, RMSEP = 5.62 cm with leave‐one‐out cross validation). The new transfer function was applied to a short peat core from Arctic Russia and revealed two major hydrological shifts, which could be validated against plant macrofossil data. We also compared our model to another two models from more temperate peatlands. Comparison of the different testate amoeba datasets suggests that testate amoeba ecohydrological relationships are similar for permafrost peatlands to those in more temperate regions, but there are some differences that suggest a need for training datasets that are fully representative of permafrost peatlands.

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“…We also test the reliability of the transfer functions applied to oceanic pollen assemblages by reconstructing the climate conditions from 24 oceanic surface sediment samples (these oceanic samples were previously removed from the 183‐sample modern pollen–climate training set before to perform this test). We further check the extent to which calibration may be affected by spatial autocorrelation using the R package PALAEOSIG (Telford, ). Finally, we apply the models to two oceanic pollen records: core MD07‐3104 located at 41°S in Reloncaví Fjord and core MD07‐3088 located at 46°S offshore Taitao Peninsula (Montade et al , , ).…”

Section: Methodsmentioning

confidence: 99%

A pollen–climate calibration from western Patagonia for palaeoclimatic reconstructions

Montade

Peyron

Favier

et al. 2019

J Quaternary Science

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Palaeoecological studies of sediment records from the western margins of southern South America have revealed vegetation dynamics to be under the influence of major regional climate drivers such as the Southern Westerly Winds, Southern Annular Mode and El Niño Southern Oscillation. Despite the substantial number of palynological records in this region, very few quantitative pollen‐based climate reconstructions using surface samples have been made. In this context, our objective was first to investigate the modern pollen–vegetation–climate relationships in the western Patagonian. The results show that the modern pollen dataset reflects the main vegetation types and that summer precipitation and winter temperature represent the main climate parameters controlling vegetation distribution. Secondly using this pollen–climate dataset we evaluate and compare the performance of two models (Weighted Averaging Partial Least Squares and Modern Analog Technique). We used these models to make climate reconstructions from two oceanic pollen records from western Patagonia. Compared with independent climate indicators, our pollen‐inferred climate reconstructions reveal the same overall trends, showing the potential of pollen–climate transfer functions applied to this region. This study provides much needed data for quantitative climate reconstructions in South America, but which also needs to be improved by enlarging the modern pollen dataset.

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Review and test of reproducibility of subdecadal resolution palaeoenvironmental reconstructions from microfossil assemblages

Cited by 8 publications

References 68 publications

A global database of Holocene paleotemperature records

A global database of Holocene paleotemperature records

Testate amoeba as palaeohydrological indicators in the permafrost peatlands of north‐east European Russia and Finnish Lapland

A pollen–climate calibration from western Patagonia for palaeoclimatic reconstructions

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