Antarctica was warmer one thousand years ago — and life was OK
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Climate Depot | 7/10/2019 | Marc Morano
AavyAavy (Posted by) Level 4


Antarctica is twice the size of the US or Australia. Buried 2 km deep under domes of snow, it holds 58 meters of global sea level to ransom. The IPCC have been predicting its demise-by-climate-change for a decade or two.

A new paper looks at 60 sites across Antarctica, considering everything from ice, lake and marine cores to peat and seal skins. They were particularly interested in the Medieval Warm Period, and researched back to 600AD. During medieval times (1000-1200 AD) they estimate Antarctica as a whole was hotter than it is today. Antarctica was even warmer still — during the dark ages circa 700AD.

Eyes - Tiny - Spike

Feast your eyes on the decidedly not unprecedented modern tiny spike:

….

Jaggy - AD - Antarctica - Twenty - Years

The little jaggy down after 2000 AD is real. While there was rapid warming across Antarctica from 1950-2000, in the last twenty years, that warming has stalled. Just another 14 million square kilometers that the models didn’t predict.

We already knew the Medieval Warm Period was a global phenomenon, thanks to hundreds of proxies, and 6,000 boreholes. But this new paper is a great addition.

Dedication - Team - Oceanic - Factors - Graph

With an awesome dedication to detail, the team put all the big oceanic and other factors into one big graph. It is nice to see them side by side so we can see the connections between them.

Fig. 8. Reconstructions of key drivers of natural climate variability. Southern Annular Mode, SAM, 70 year loess filter (Abram et al., 2014); El Niño-Southern Oscillation, ENSO (Conroy et al., 2008); Interdecadal Pacific Oscillation, IPO, piece-wise linear fit (Vance et al., 2015); Pacific Decadal Oscillation, PDO (MacDonald and Case, 2005); Atlantic Multidecadal Oscillation, AMO (Mann et al., 2009); solar activity changes (Steinhilber et al., 2012); volcanic eruptions (Sigl et al., 2015).

Parts - Antarctica - Parts - Parts - Sea-sawing

Looking at different parts of Antarctica some parts cooled while other parts warmed. Many of these “sea-sawing” pairs appear...
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