Reassessing the Value of Regional Climate Modeling Using Paleoclimate Simulations

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http://hdl.handle.net/10138/338702

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Armstrong , E , Hopcroft , P O & Valdes , P J 2019 , ' Reassessing the Value of Regional Climate Modeling Using Paleoclimate Simulations ' , Geophysical Research Letters , vol. 46 , no. 21 , pp. 12464-12475 . https://doi.org/10.1029/2019GL085127

Title: Reassessing the Value of Regional Climate Modeling Using Paleoclimate Simulations
Author: Armstrong, Edward; Hopcroft, Peter O.; Valdes, Paul J.
Contributor organization: Department of Geosciences and Geography
Date: 2019-11-16
Language: eng
Number of pages: 12
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1029/2019GL085127
URI: http://hdl.handle.net/10138/338702
Abstract: Regional climate models (RCMs) are often assumed to be more skillful compared to lower-resolution general circulation models (GCM). However, RCMs are driven by input from coarser resolution GCMs, which may introduce biases. This study employs versions of the HadAMB3 GCM at three resolutions (>50 km) to investigate the added value of higher resolution using identically configured simulations of the preindustrial (PI), mid-Holocene, and Last Glacial Maximum. The RCM shows improved PI climatology compared to the coarse-resolution GCM and enhanced paleoanomalies in the jet stream and storm tracks. However, there is no apparent improvement when compared to proxy reconstructions. In the high-resolution GCM, accuracy in PI climate and atmospheric anomalies are enhanced despite its intermediate resolution. This indicates that synoptic and mesoscale features in a RCM are influenced by its low-resolution input, which impacts the simulated climatology. This challenges the paradigm that RCMs improve the representation of climate conditions and change.
Subject: climate modeling
regional climate modeling
paleoclimate
resolution
atmosphere
added value
LAST GLACIAL MAXIMUM
ATMOSPHERIC CIRCULATION
IBERIAN PENINSULA
EAST-ASIA
ADD VALUE
EUROPE
RESOLUTION
PROJECTIONS
OCEAN
TEMPERATURE
1171 Geosciences
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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