2 New Papers Indicate Modern Climate Still In A ‘Colder Stage’, Modulated By Solar Activity, ENSO

Graph from Perner et al. (2018) that shows modern-day Arctic sea ice (furthest left navy trend line) is still only slightly lower than during the Little Ice Age (LIA), and much more extensive (more ice) than during the Medieval Climate Anomaly (MCA), Roman Warm Period (RWP), and nearly all of the last 7,000 years.

Song et al., 2018

[A] general warm to cold climate trend from the mid-Holocene to the present, which can be divided into two different stages: a warmer stage between 6842 and 1297 cal yr BP and a colder stage from 1297 cal yr BP to the present.

The general cooling trend may represent a response to decreasing solar insolation; however, the relative dryness or wetness of the climate may have been co-determined by westerlies and the East Asian summer monsoon (EASM). The climate had a teleconnection with the North Atlantic region, resulting from changes in solar activity.

Perner et al., 2018

[W]e find evidence of distinct late Holocene millennial-scale phases of enhanced El Niño/La Niña development, which appear synchronous with northern hemispheric climatic variability.

Phases of dominant El Niño-like states occur parallel to North Atlantic cold phases: the ‘2800 years BP cooling event’, the ‘Dark Ages’ and the ‘Little Ice Age’, whereas the ‘Roman Warm Period’ and the ‘Medieval Climate Anomaly’ parallel periods of a predominant La Niña-like state.

Our findings provide further evidence of coherent interhemispheric climatic and oceanic conditions during the mid to late Holocene, suggesting ENSO as a potential mediator.

One response to “2 New Papers Indicate Modern Climate Still In A ‘Colder Stage’, Modulated By Solar Activity, ENSO”

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