REDFIT: estimating red-noise spectra directly from unevenly spaced paleoclimatic time series

Schulz, Michael; Mudelsee, Manfred

doi:10.1016/s0098-3004(01)00044-9

Cited by 1,075 publications

(873 citation statements)

References 14 publications

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“…A cyclostratigraphic analysis was performed in the BdlC-01 pollen time series. We used the REDFIT software (Schultz and Mudelsee, 2002) on the unevenly spaced pollen time series in order to identify cyclical changes in the vegetation through spectral peaks registered at different frequencies throughout the studied core.…”

Section: Methodsmentioning

confidence: 99%

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

Ramos‐Román

Jiménez‐Moreno

Anderson

et al. 2016

Quaternary Science Reviews

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Highlights1. We studied a late Holocene vegetation and fire record from southern Spain.2. A long-term aridification trend is observed, interrupted by shorter-scale variability.3. This study shows humidity changes during the last 4500 yr, related to NAO changes and solar variability. AbstractHigh-resolution pollen analysis, charcoal, non-pollen palynomorphs and magnetic susceptibility have been analyzed in the sediment record of a peat bog in Sierra Nevada in southern Iberia. The study of these proxies provided the reconstruction of vegetation, 2 climate, fire and human activity of the last ~4500 cal yr BP. A progressive trend towards aridification during the late Holocene is observed in this record. This trend is interrupted by millennial-and centennial-scale variability of relatively more humid and arid periods. Arid conditions are recorded between ~4000 to 3100 cal yr BP, being characterized by a decline in arboreal pollen and with a spike in magnetic susceptibility. This is followed by a relatively humid period from ~3100 to 1600 cal yr BP, coinciding partially with the Iberian-Roman Humid Period, and is indicated by the increase of

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Section: Methodsmentioning

confidence: 99%

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

Ramos‐Román

Jiménez‐Moreno

Anderson

et al. 2016

Quaternary Science Reviews

View full text Add to dashboard Cite

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“…The statistical significance of the correlation between changes in the SIC and 14 C production rate was evaluated based on comparisons to synthetic red-noise time series data. The synthetic data were modelled as a first-order autoregressive (AR1) process, following the procedure of Schulz and Mudelsee (2002), with a characteristic memory factor (f) equal to that obtained for the raw SIC data. A total of 10,000 synthetic SIC datasets were simulated using a Monte Carlo approach, and the correlation coefficients obtained between the synthetic SIC data and 14 C production rate were compared to those obtained for the actual SIC data.…”

Section: Statistical Significancementioning

confidence: 99%

“…The power spectrum of the reconstructed SIC record was computed using the public domain software program REDFIT, which applies the Lomb-Scargle Fourier transform (Schulz and Mudelsee, 2002). Similar to the more traditional Fourier analysis, the Lomb-Scargle method is based on a least-squares fit of sinusoids to the time series data.…”

Section: Spectral and Wavelet Analysesmentioning

confidence: 99%

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

Sha

Jiang

Seidenkrantz

et al. 2016

Quaternary Science Reviews

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a b s t r a c tArctic sea ice represents an important component of the climate system, and the present reduction of sea ice in the Arctic is of major concern. Despite its importance, little is known about past changes in sea-ice cover and the underlying forcing mechanisms. Here, we use diatom assemblages from a marine sediment core collected from the West Greenland shelf to reconstruct changes in sea-ice cover over the last millennium. The proxy-based reconstruction demonstrates a generally strong link between changes in sea-ice cover and solar variability during the last millennium. Weaker (or stronger) solar forcing may result in the increase (or decrease) in sea-ice cover west of Greenland. In addition, model simulations show that variations in solar activity not only affect local sea-ice formation, but also control the sea-ice transport from the Arctic Ocean through a sea-iceeoceaneatmosphere feedback mechanism. The role of solar forcing, however, appears to have been more ambiguous during an interval around AD 1500, after the transition from the Medieval Climate Anomaly to the Little Ice Age, likely to be driven by a range of factors.

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“…The fit subroutine of TAUEST was also combined with the SPECTRUM frequency-analysis package for unevenly spaced data (Schulz and Stattegger, 1997) to quantify the analogue of persistence in the frequency domainFred noise (Schulz and Mudelsee, 2002).…”

Section: Introductionmentioning

confidence: 99%

REDFIT: estimating red-noise spectra directly from unevenly spaced paleoclimatic time series

Cited by 1,075 publications

References 14 publications

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

TAUEST: a computer program for estimating persistence in unevenly spaced weather/climate time series

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