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Southeast Asia Megadrought : Previously Unknown Mid-Holocene Event Led to Major Changes in Human Settlement

SciTechDaily (AUGUST 21, 2020 )

Titre : Southeast Asia Megadrought : Previously Unknown Mid-Holocene Event Led to Major Changes in Human Settlement

Researchers link end of Green Sahara with Southeast Asia megad

SciTechDaily (AUGUST 21, 2020 )

Présentation
Physical evidence found in caves in Laos helps tell a story about a connection between the end of the Green Sahara — when once heavily vegetated Northern Africa became a hyper-arid landscape — and a previously unknown megadrought that crippled Southeast Asia 4,000 to 5,000 years ago.

In a paper published today in Nature Communications, scientists at the University of California, Irvine, the University of Pennsylvania, William Paterson University of New Jersey and other international institutions explain how this major climate transformation led to a shift in human settlement patterns in Southeast Asia, which is now inhabited by more than 600 million people.

The modeling experiments suggested that reduced plant growth in the Sahara led to increased airborne dust that acted to cool the Indian Ocean and shift the Walker circulation pattern eastward, causing it to behave in ways similar to modern-day El Niño events. This, ultimately, led to a large reduction in monsoon moisture across Southeast Asia that lasted more than 1,000 years, according to Johnson.

Source  : UNIVERSITY OF CALIFORNIA - IRVINE

Annonce (SciTechDaily)

Page publiée le 28 juin 2021