Supplementary material to "Attributing the 2017 Bangladesh floods from meteorological and hydrological perspectives&quot (original) (raw)

Fig. S1 shows the seasonal cycle of daily rainfall for both observations (CPC, ERA-int and GPCC) and the EC-Earth model. It shows that in the model, as expected, most precipitation falls in the months JJA, with a peak in July, like in observations, though the increase in precipitation is slightly steeper in June than it is in observations. The average amount of rainfall in these months is comparable to the observational datasets, with a maximum of around 10 mm/day. It is worth noting that CPC tends to underestimate the precipitation at higher elevations due to a lack of available station data. 2 weather@home The annual cycle of 10-day running mean precipitation in the Brahmaputra basin from weather@home Historical simulations is compared to CPC, GPCC and TRMM observational records in figure S2. Note TRMM is also included for reference but since data is not available post 2015 it is excluded from the rest of the analysis. Within the monsoon season the mean magnitude of precipitation within weather@home shows reasonable agreement with observational estimates, although the variability of precipitation in this period is too small. In the pre-monsoon season weather@home precipitation is too high and therefore the monsoon onset appears to occur too early within the model. Comparing the spatial agreement of JJAS mean precipitation (not shown) shows that, although model output is noisier, the magnitude and pattern of weather@home output agrees well with GPCC and CPC observations.