The added value of km-scale simulations to describe temperature over complex orography: the CORDEX FPS-Convection multi-model ensemble runs over the Alps - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Climate Dynamics Year : 2022

The added value of km-scale simulations to describe temperature over complex orography: the CORDEX FPS-Convection multi-model ensemble runs over the Alps

Stefan Sobolowski
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  • PersonId : 1209660
Ségolène Berthou
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  • PersonId : 1209662
Andreas Dobler
  • Function : Author
  • PersonId : 1209664
Geert Lenderink
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  • PersonId : 1107348
T. Lorenz
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  • PersonId : 1209666
Josipa Milovac
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  • PersonId : 1209667
Heimo Truhetz
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  • PersonId : 1209670
Mario Raffa
  • Function : Author
  • PersonId : 1209674
Kevin Sieck
  • Function : Author
  • PersonId : 1209676
Sophie Bastin

Abstract

The increase in computational resources has enabled the emergence of multi-model ensembles of convection-permitting regional climate model (CPRCM) simulations at very high horizontal resolutions. An example is the CORDEX Flagship Pilot Study on "Convective phenomena at high resolution over Europe and the Mediterranean", a set of kilometre-scale simulations over an extended Alpine domain. This first-of-its-kind multi-model ensemble, forced by the ERA-Interim reanalysis, can be considered a benchmark dataset. This study uses a recently proposed metric to determine the added value of all the available Flagship Pilot Study hindcast kilometre-scale simulations for maximum and minimum temperature. The analysis is performed using state-of-the-art gridded and station observations as ground truth. This approach directly assesses the added value between the high-resolution CPRCMs against their driving global simulations and coarser resolution RCM counterparts. Overall, models display some modest gains, but also considerable shortcomings are exhibited. In part, these deficiencies can be attributed to the assimilation of temperature observations into ERA-Interim. Although the gains for the use of kilometrescale resolution for temperature are limited, the improvement of the spatial representation of local atmospheric circulations and land-atmosphere interactions can ultimately lead to gains, particularly in coastal areas.
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insu-03913367 , version 1 (26-12-2022)

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Attribution - NonCommercial

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P.M.M. Soares, J. A. M. Careto, Rita M. Cardoso, Klaus Goergen, Eleni Katragkou, et al.. The added value of km-scale simulations to describe temperature over complex orography: the CORDEX FPS-Convection multi-model ensemble runs over the Alps. Climate Dynamics, In press, ⟨10.1007/s00382-022-06593-7⟩. ⟨insu-03913367⟩
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