Role of atmospheric horizontal resolution in simulating tropical and subtropical South American precipitation in HadGEM3-GC31
作者： Paul-Arthur Monerie , Amulya Chevuturi , Peter Cook , Nicholas P. Klingaman , Christopher E. Holloway
关键词: Environmental science 、 Convection 、 Climate model 、 Subtropics 、 Mesoscale meteorology 、 Precipitation 、 Horizontal resolution 、 Climatology 、 Amazon rainforest 、 Resolution (electron density)
摘要: Abstract. We assess the effect of increasing horizontal resolution on simulated precipitation over South America in a climate model. use atmosphere-only simulations, performed with HadGEM3-GC31 at three resolutions: N96 (~ 130 km, 1.88° × 1.25°), N216 (~ 60 km, 0.83° 0.56°), and N512 (~25 km, 0.35° 0.23°). show that all simulations have systematic biases annual mean seasonal (e.g. too wet Amazon dry northeast). Increasing improves Andes north-east Brazil. Over Andes, improvements from continue to ~ 25 km, while Brazil, there are no beyond ~ 60 km resolution. These changes primarily related atmospheric dynamics moisture flux convergence. basin, variability increases higher some spatial temporal features daily American improved high resolution, including intensity spectra rainfall. Spatial scales also better simulated, suggesting may improve representation mesoscale convective systems.
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