Global Monsoon Precipitation Simulations
Zhang, L. and Zhou, T. 2014. An assessment of improvements in global monsoon precipitation simulation in FGOALS-s2. Advances in Atmospheric Sciences 31: 165-178.
Zhang and Zhou report that "the main deficiency of FGOALS-s2 is that the northwestern Pacific monsoon (NWPM) has  a weaker monsoon mode and  stronger negative pattern in spring-fall asymmetric mode," that "the smaller NWPM domain in FGOALS-s2 is due to  its simulated colder SST over the western Pacific warm pool," and that  "the simulated precipitation anomaly over the South African monsoon region-South Indian Ocean during La Niña years is opposite to the observation," which leads to [5/6] "stronger upper-troposphere (lower-troposphere) divergence (convergence) over the Indian Ocean, and [7/8] artificial vertical ascent (decent) over the Southwest Indian Ocean (South African monsoon region), inducing [9/10] local excessive (deficient) rainfall."
In spite of improvements in other modeling aspects that may have been made in progressing from FGOALS-s1 to FGOALS-s2, it would appear that there is still much that remains to be done before the newest version is truly ready for what could be called prime-time application.