  We have analyzed the teleconnection of total cloud fraction (TCF) with global
sea surface temperature (SST) in multi-model ensembles (MME) of the fifth and
sixth Coupled Model Intercomparison Projects (CMIP5 and CMIP6). CMIP6-MME has a
more robust and realistic teleconnection (TCF and global SST) pattern over the
extra-tropics (R ~0.43) and North Atlantic (R ~0.39) region, which in turn
resulted in improvement of rainfall bias over the Asian summer monsoon (ASM)
region. CMIP6-MME can better reproduce the mean TCF and have reduced dry (wet)
rainfall bias on land (ocean) over the ASM region. CMIP6-MME has improved the
biases of seasonal mean rainfall, TCF, and outgoing longwave radiation (OLR)
over the Indian Summer Monsoon (ISM) region by ~40%, ~45%, and ~31%,
respectively, than CMIP5-MME and demonstrates better spatial correlation with
observation/reanalysis. Results establish the credibility of the CMIP6 models
and provide a scientific basis for improving the seasonal prediction of ISM.
