Originally Posted by
Sunsettommy
Try this chart on them, it might finish them off:
This is a misleading set of graphs, out of date, and incorrect. The temperature record was based on 1 location in Greenland using oxygen isotope ratios, so a direct temperature wasn't measured. The
oxygen 18 isotope based temperature reconstruction only extends to the year 1880 - not the present. An observational temperature record extending fro 1880 to the present needs to be connected to
the oxygen isotope proxy record. Most of the modern warming isn't shown in the graph
https://www.desmogblog.com/2019/03/0...climate-change
" The GISP2 reconstruction changes the relationship between 18O and temperatures by a factor of two during the Holocene, while more recent reconstructions keep it constant. Similarly, elevation change influences 18O records. The old GISP2 reconstruction did not take elevation changes into account."
Scientists reconstructing past Greenland temperatures now use estimates from many different ice cores, which reduces the uncertainties associated with any single one and gives a more accurate picture of changes over Greenland as a whole.
Alley made this point explicitly, telling Revkin:“So, what do we get from GISP2? Alone, not an immense amount. With the other Greenland ice cores… and compared to additional records from elsewhere, an immense amount… Using GISP2 data to argue against global warming is, well, stupid, or misguided, or misled, or something, but surely not scientifically sensible.”
https://www.desmogblog.com/2019/03/0...climate-change
A misleading graph purporting to show that past changes in Greenland’s temperatures dwarf modern climate change has been circling the internet since at least 2010.
Based on an early Greenland ice core record produced back in 1997, versions of the graph have, variously, mislabeled the x-axis, excluded the modern observational temperature record and conflated a single location in Greenland with the whole world.
More recently, researchers have drilled numerous additional ice cores throughout Greenland and produced an updated estimate past Greenland temperatures.
This modern temperature reconstruction, combined with observational records over the past century, shows that current temperatures in Greenland are warmer than any period in the past 2,000 years. That said, they are likely still cooler than during the early part of the current geological epoch — the Holocene — which started around 11,000 years ago.