Nudging technique for scale bridging in air quality/climate atmospheric composition modelling 1Istituto di Scienze dell'Atmosfera e del Clima, Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
24 Apr 2012
2Italian National Agency for New Technologies, Energy and Sustainable Economic Development ENEA, Air Pollution Unit, via Martiri di Monte Sole, 4 40129 Bologna, Italy
Received: 18 May 2011 – Published in Atmos. Chem. Phys. Discuss.: 20 Jun 2011 Abstract. The interaction between air quality and climate involves dynamical
scales that cover a very wide range. Bridging these scales in
numerical simulations is fundamental in studies devoted to
megacity/hot-spot impacts on larger scales. A technique based on nudging
is proposed as a bridging method that can couple different models at
Revised: 31 Jan 2012 – Accepted: 06 Apr 2012 – Published: 24 Apr 2012
Here, nudging is used to force low resolution chemical composition
models with a run of a high resolution model on a critical area. A one-year numerical
experiment focused on the Po Valley hot spot is performed using the
BOLCHEM model to asses the method.
The results show that the model response is stable to perturbation
induced by the nudging and that, taking the high resolution run as a
reference, performances of the nudged run increase with respect to the
non-forced run. The effect outside the forcing area depends on transport
and is significant in a relevant number of
events although it becomes weak on seasonal or yearly basis.
Citation: Maurizi, A., Russo, F., D'Isidoro, M., and Tampieri, F.: Nudging technique for scale bridging in air quality/climate atmospheric composition modelling, Atmos. Chem. Phys., 12, 3677-3685, doi:10.5194/acp-12-3677-2012, 2012.