Paleo calendar-effect adjustments in time-slice and transient climate-model simulations (PaleoCalAdjust v1.0): impact and strategies for data analysis
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Published:2019-09-03
Issue:9
Volume:12
Page:3889-3913
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Bartlein Patrick J., Shafer Sarah L.ORCID
Abstract
Abstract. The “paleo calendar effect” is a common expression for
the impact that changes in the length of months or seasons over time,
related to changes in the eccentricity of Earth's orbit and precession, have
on the analysis or summarization of climate-model output. This effect can
have significant implications for paleoclimate analyses. In particular,
using a “fixed-length” definition of months (i.e., defined by a fixed
number of days), as opposed to a “fixed-angular” definition (i.e., defined
by a fixed number of degrees of the Earth's orbit), leads to comparisons of
data from different positions along the Earth's orbit when comparing paleo
with modern simulations. This effect can impart characteristic spatial
patterns or signals in comparisons of time-slice simulations that otherwise
might be interpreted in terms of specific paleoclimatic mechanisms, and we
provide examples for 6, 97, 116, and 127 ka. The calendar effect is
exacerbated in transient climate simulations in which, in addition to spatial
or map-pattern effects, it can influence the apparent timing of extrema in
individual time series and the characterization of phase relationships among
series. We outline an approach for adjusting paleo simulations that have
been summarized using a modern fixed-length definition of months and that
can also be used for summarizing and comparing data archived as daily data.
We describe the implementation of this approach in a set of Fortran 90
programs and modules (PaleoCalAdjust v1.0).
Publisher
Copernicus GmbH
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