Spectral nudging in a spectral regional climate model

By R. Radu, Michel Déqué, S. Somot. 2008

209 citations recorded by the source corpus.

Spectral nudging, a dynamic downscaling method, has been used as a suitable approach to force a regional model to adopt prescribed large-scales over the entire domain, not just at the lateral boundaries, while developing realistic detailed regional features consistent with the large-scales. The aim of this study is to compare a global spectral climate model at high resolution (50 km) and a driven spectral regional climate model over Europe by using the so-called perfect model approach. The spectral nudging method is applied in order to achieve a better representation of large-scale climate over a limited domain. The results show that the regional model driven only at its lateral boundaries presents a summer warm bias in the middle of the domain. This bias disappears when spectral nudging is applied. On the other hand, the smallest scales which are not driven by the spectral nudging are not significantly affected by scale interaction. The only detrimental impact of spectral nudging is a slight precipitation increase in the upper quantiles of precipitation, which can be resolved by large-scale nudging of specific humidity.

Subfields: Atmospheric Science, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/0b5393cbaa93b81b6614d5a0de7bbd5fe47422b3

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atmospheric Science

In Global and Planetary Change

Citations in the corpus

A fully coupled Mediterranean regional climate system model: design and evaluation of the ocean component for the 1980–2012 period (2014, methodology): “The ALADIN-Climate model (Radu et al., 2008; Colin et al., 2010; Herrmann et al., 2011) is a bi-spectral regional climate model (RCM) with a semi-implicit semi-Lagrangian advection scheme.”
Direct and semi-direct aerosol radiative effect on the Mediterranean climate variability using a coupled regional climate system model (2015, background): “It includes the regional climate atmospheric model ALADINClimate (Radu et al. 2008; Déqué and Somot 2008; Farda et al. 2010; Colin et al. 2010; Herrmann et al. 2011), the land–surface model ISBA (Noilhan and Mahfouf 1996), the river routing scheme TRIP (Decharme et al. 2010) and the regional…”
Dynamical downscaling of ERA-40 in complex terrain using the WRF regional climate model (2011, methodology): “While spectral nudging seems to reduce the sensitivity to the chosen model domain or grid size (Alexandru et al. 2008; Miguez-Macho et al. 2004) other studies show that it can affect extreme precipitation or high frequency dynamical phenomena (Alexandru et al. 2008; Radu et al. 2008).”