By Kenneth Richard on 6. November 2023
Important twenty first century cooling within the Central Pacific, Jap Pacific, and almost all of Antarctica “implies substantial uncertainties in future temperature projections of CMIP6 fashions.” – Zhang et al., 2023
New analysis signifies West Antarctica’s imply annual floor temperatures cooled by greater than -1.8°C (-0.93°C per decade) from 1999-2018. In spring, the West Antarctic Ice Sheet (WAIS) cooling charge reached -1.84°C per decade.
Not solely has the WAIS undergone important cooling within the final twenty years, many of the continent additionally cooled by greater than 1°C. See, for instance, the ~1°C per decade cooling pattern for East Antarctica (2000 to 2018) proven in Fig. ES1.
Of 28 CMIP6 fashions, none captured a cooling pattern – particularly of this amplitude – for this area. This modeling failure “implies substantial uncertainties in future temperature projections of CMIP6 fashions.”
Picture Supply: Zhang et al., 2023
The post-1999 cooling pattern has not simply been confined to Antarctica. Sea floor temperatures (SSTs) within the Jap and Central Pacific (south of 25°N) additionally cooled from 1999-2018 relative to 1979-1997. This cooling encompasses almost half of the Southern Hemisphere’s SSTs.
Picture Supply: Zhang et al., 2023
The 1999-2018 imply annual floor temperature cooling of the Antarctic continent and almost half of the Southern Hemisphere’s SSTs don’t help the claims that floor warming is pushed by human emissions of greenhouse gases (GHGs). In spite of everything, if the widespread cooling can’t be defined by the rise in GHG forcing, why would the identical concentrations of GHGs clarify the areas with warming temperatures?
HT/David H, bnice2000
