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Global Monsoon Precipitation Simulations

Reference
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.
In essentially all climate-modeling programs, periodic assessments are typically made to see how their "new-and-improved" versions have hopefully gotten better at representing reality; and it is within this framework the probing study of Zhang and Zhou was conducted. Very simply, in the words of the two authors Zhang and Zhou (2014), "the performance of Version 2 of the Flexible Global Ocean-Atmosphere-Land System model (FGOALS-s2) in simulating global monsoon precipitation (GMP) was evaluated."

Zhang and Zhou report that "the main deficiency of FGOALS-s2 is that the northwestern Pacific monsoon (NWPM) has [1] a weaker monsoon mode and [2] stronger negative pattern in spring-fall asymmetric mode," that "the smaller NWPM domain in FGOALS-s2 is due to [3] its simulated colder SST over the western Pacific warm pool," and that [4] "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.

Archived 25 March 2014