Articles | Volume 15, issue 2
Clim. Past, 15, 781–793, 2019
https://doi.org/10.5194/cp-15-781-2019

Special issue: The 4.2 ka BP climatic event

Clim. Past, 15, 781–793, 2019
https://doi.org/10.5194/cp-15-781-2019

Research article 11 Apr 2019

Research article | 11 Apr 2019

Atmospheric blocking induced by the strengthened Siberian High led to drying in west Asia during the 4.2 ka BP event – a hypothesis

Aurel Perşoiu et al.

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Latest update: 29 Nov 2021
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Short summary
We present a reconstruction of winter climate around 4.2 ka cal BP in Europe, west Asia, and northern Africa that shows generally low temperatures and heterogeneously distributed precipitation. We hypothesize that in the extratropical Northern Hemisphere the 4.2 ka BP event was caused by the strengthening and expansion of the Siberian High, which effectively blocked the moisture-carrying westerlies from reaching west Asia and also resulted in outbreaks of northerly cold and dry winds.