Oxygen isotope series are the backbone of deep-time paleoclimate. The canonical 800,000 year comparison of CO2 and temperature uses O18 values from Vostok, Antarctica to estimate temperature. In deep time, O18 values are a real success story: they clearly show changes from the LGM to the Holocene that cohere with glacial moraines. On its face, […]
Tag Archives: law dome
In a figure that took considerable work, IPCC AR5 (First Draft) compared 5 regional proxy reconstructions to model output. In Australia, they used the Gergis (Neukom) et al 2012 reconstruction, In South America, they used a Neukom et al 2011 (Clim Dyn) reconstruction. In 2011, Neukom refused to provide me with the data versions used […]
IPCC AR5 (First Draft) cited Gergis et al as follows: New paleo records from Australasia provide evidence of MCA warming around 1250–1330 CE, [my bold] somewhat later than maximum medieval warmth described from many Northern Hemisphere regions (Gergis et al., submitted). Following peak medieval warmth in the early 1300s, a cooling trend reaching a temperature […]
Re-reading Climategate and AR4 Review Comments, I noticed an interesting discussion about handling the Law Dome O18 record – a series used in Mann and Jones (2003) and Jones and Mann (2004) with a very elevated MWP.