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Finer climate models capture South Asian monsoon rain better

High-resolution HighResMIP runs reduce dry bias and better match monsoon timing and intensity in the Ganga–Brahmaputra–Meghna basin.

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What basin did this HighResMIP evaluation target?

The Ganges–Brahmaputra–Meghna (GBM) basin in South Asia.

Which HighResMIP experiment tier did they use and why?

Tier 2 coupled atmosphere–ocean runs, because Tier 1 atmosphere-only runs lack ocean coupling.

Which four model families were compared at high and low resolution?

CMCC-CM2, HadGEM3-GC31, MPI-ESM1, and EC-Earth3P.

What is the typical CMIP6 versus HighResMIP target resolution?

Typical CMIP6 is ~100 km; HighResMIP Tier 1 & 2 targets 25 to 50 km.

How well did high-resolution models simulate mean annual rainfall versus MSWEP?

They reduced dry biases and better simulated average annual rainfall than their low-resolution counterparts.

What basin-mean rainfall does MSWEP show?

6.33 mm/day, with higher rainfall in the eastern half of the basin.

What wet bias does ERA5 have relative to MSWEP?

2.37 mm/day.

How did reference versus model monsoon onset typically differ?

References showed onset typically in May; models showed later onset, on average in June.

How did monsoon duration change by 2014 in MSWEP, ERA5, and the model ensembles?

MSWEP up to +15 days, ERA5 +10 days, HR-models +5 days; LR-models decreased by 1 day.

Were resolution-related trend differences statistically significant?

No: differences were evident but trends were not statistically significant (p > 0.05).

What future (2015–2050) strength-index increases do HR-models show per decade?

About 1.8% PRCPTOT, 3.8% Rx6HR, and 4.8% R95p per decade.