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Improved spectral comparisons of paleoclimate models and observations via proxy system modeling: Implications for multi-decadal variability

TLDR
In this paper, a forward proxy modeling approach coupled with an isotope-enabled GCM is proposed to disentangle the various contributions to signals embedded in ice cores, speleothem calcite, coral aragonite, tree-ring width, and tree cellulose, and conclude that the paleoclimate record may exhibit larger low-frequency variability than GCMs currently simulate, indicative of incomplete physics and/or forcings.
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This article is published in Earth and Planetary Science Letters.The article was published on 2017-10-15 and is currently open access. It has received 39 citations till now. The article focuses on the topics: Climate model.

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Assessing proxy system models of cave dripwater δ18O variability

TL;DR: In this paper, the authors evaluate four commonly applied proxy system models (PSMs), which span a range of complexity (one simple, two intermediate-complexity, and one complex model).
Journal ArticleDOI

Validating CCSM3 paleoclimate data using pollen-based reconstruction in the intermountain west

TL;DR: In this article, the authors compare the results from the downscaled and debiased Community Climate System Model 3 to pollen-based reconstructions for 27 sites in Wyoming, USA and show major disparities between the two climate reconstructions with average annual precipitation and actual evapotranspiration performing the best of six variables.
Peer ReviewDOI

Pyleoclim: Paleoclimate Timeseries Analysis and Visualization With Python

TL;DR: Pyleoclim as mentioned in this paper is a Python package geared toward the intuitive analysis and visualization of paleoclimate timeseries, allowing users to take advantage of a large collection of existing and emerging techniques.

Constraining Clouds and Convective Parameterizations in a Climate Model Using Paleoclimate Data

TL;DR: In this article , the authors provide a proof-of-concept study to constrain these parameterizations in a perturbed parameter ensemble of the atmosphere-only version of the Goddard Institute for Space Studies Model E2.
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Journal ArticleDOI

An Overview of CMIP5 and the Experiment Design

TL;DR: The fifth phase of the Coupled Model Intercomparison Project (CMIP5) will produce a state-of-the- art multimodel dataset designed to advance the authors' knowledge of climate variability and climate change.
Journal ArticleDOI

Studies in astronomical time series analysis. II - Statistical aspects of spectral analysis of unevenly spaced data

TL;DR: This paper studies the reliability and efficiency of detection with the most commonly used technique, the periodogram, in the case where the observation times are unevenly spaced to retain the simple statistical behavior of the evenly spaced case.
Journal ArticleDOI

Spectrum estimation and harmonic analysis

TL;DR: In this article, a local eigenexpansion is proposed to estimate the spectrum of a stationary time series from a finite sample of the process, which is equivalent to using the weishted average of a series of direct-spectrum estimates based on orthogonal data windows to treat both bias and smoothing problems.
Journal ArticleDOI

Variations in the Earth's Orbit: Pacemaker of the Ice Ages

TL;DR: It is concluded that changes in the earth's orbital geometry are the fundamental cause of the succession of Quaternary ice ages and a model of future climate based on the observed orbital-climate relationships, but ignoring anthropogenic effects, predicts that the long-term trend over the next sevem thousand years is toward extensive Northern Hemisphere glaciation.
Journal ArticleDOI

The Community Climate System Model Version 4

TL;DR: The fourth version of the Community Climate System Model (CCSM4) was recently completed and released to the climate community as mentioned in this paper, which describes developments to all CCSM components, and documents fully coupled preindustrial control runs compared to the previous version.
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Frequently Asked Questions (1)
Q1. What contributions have the authors mentioned in the paper "Improved spectral comparisons of paleoclimate models and observations via proxy system modeling: implications for multi-decadal variability" ?

In this paper the authors bridge this gap via a forward modeling approach, coupled to an isotope-enabled GCM. The paper addresses the following questions: ( 1 ) do forward modeled “ pseudoproxies ” exhibit variability comparable to proxy data ? The authors apply their method to representative case studies, and parlay these insights into an analysis of the PAGES2k database ( ? ). The authors conclude that, specific to this set of PSMs and isotope-enabled model, the paleoclimate record may exhibit larger low-frequency variability than GCMs currently simulate, indicative of ∗Corresponding author Email addresses: sylvia 11 dee @ brown. The authors find that current proxy system models ( PSMs ) can help resolve model-data discrepancies on interannual to decadal timescales, but can not account for the mismatch in variance on multi-decadal to centennial timescales.