Paleoclimate Reconstructions Continue To Document A Much Warmer-Than-Today Holocene

From NoTricksZone

By Kenneth Richard on 28. December 2023

Distribution of pollen records used in the climate reconstructions. The colour coding shows the length of the record.

According to a new study, eastern Mediterranean summer temperatures were 1.5°C to 3°C “greater than the present” from about 11,000 to 7,000 years ago, when CO2 levels were approximately 265 ppm. Then the temperatures “followed a gradual decline towards present-day conditions”.

“The MTWA also showed an increasing trend from 9 ka and reached a maximum of ca. 1.5°C greater than the present at ca. 4.5 and 5 ka, followed by a gradual decline towards present-day conditions. … The TRACE-21k-I simulation shows peak summer temperatures between 11 and 9 ka, when the MTWA was ca. 3°C greater than the present”

Image Source: Cruz-Silva et al., 2023

Maps of study sites. (a) Location of our study area and (b) bathymetric map of western Japan showing the locations of Ohtaki Cave, Maboroshi Cave, Kiriana Cave, and Lake Nojiri.

Another new study indicates the climate average was much warmer (19.9°C) during the mid-Holocene than today (13°C) in Japan. The climate here was also warmer than today ~35-40,000 and ~55-60,000 years ago, when CO2 was said to be under 200 ppm.

“The average temperature during the period from 5.4 to 3.8 ka … is 19.9°C ± 6.0°C and is higher than the present cave temperature of 13°C.”

Image Source: Kato et al., 2023
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