Anthony pointed this out in June. It is obviously one of the things that prompted Willis to look closely at the data and compare now.
From CO2 Science, something that Willis Eschebach holds dear as a regulating mechanism: The Inter-Tropical Convergence Zone
In what must be a difficult acknowledgement to make, Oueslati and Bellon (2015) write that “the double intertropical convergence zone (ITCZ) bias still affects all the models that participate in CMIP5,” – i.e. the Coupled Model Intercomparison Project, phase 5 — while further noting that “as an ensemble, general circulation models have improved little between CMIP3 and CMIP5 as far as the double ITCZ is concerned.” And, therefore, they proceed to discuss some of the many other problems that have ultimately led to this problem.
The two French researchers begin by noting that (1) “the double ITCZ bias affecting the central Pacific can be connected to the simulation of a too-zonally elongated South Pacific convergence zone,” as well as (2) “a too-zonally elongated SPCZ and a spurious…
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