Sahara's surface transformation forced an abrupt hydroclimate decline and Neolithic culture transition in northern China

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Sahara's surface transformation forced an abrupt hydroclimate decline and Neolithic culture transition in northern China

Hou, Yandong (författare): Nanjing Institute of Geography and Limnology Chinese Academy of Sciences

Long, Hao (författare): Nanjing Institute of Geography and Limnology Chinese Academy of Sciences

Tsukamoto, Sumiko (författare)

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Lu, Zhengyao (författare): Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science

Chen, Jie (författare): Lanzhou University

Ibarra, Daniel E. (författare): Brown University

Tamura, Toru (författare): University of Tokyo

Zhang, Qiong, 1971- (författare): Stockholm University,Stockholms universitet,Institutionen för naturgeografi,Bolincentret för klimatforskning (tills m KTH & SMHI)

Sun, Weiyi (författare): Nanjing Normal University

Zhang, Jingran (författare): Nanjing Normal University

Gao, Lei (författare): Nanjing Institute of Geography and Limnology Chinese Academy of Sciences

Frechen, Manfred (författare)

Shen, Ji (författare): Nanjing University

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2024
2024
Engelska.
Ingår i: The Innovation. - 2666-6758. ; 5:1

Relaterad länk:: https://doi.org/10.1...; visa fler...; http://dx.doi.org/10... (free); https://urn.kb.se/re...; https://doi.org/10.1...; https://lup.lub.lu.s...; visa färre...

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Abstract Ämnesord

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The remote forcing from land surface changes in the Sahara is hypothesized to play a pivotal role in modulating the intensity of the East Asian summer monsoon (EASM) through ocean-atmospheric teleconnections. This modu-lation has far-reaching consequences, particularly in facilitating societal shifts documented in northern China. Here, we present a well-dated lake-level record from the Daihai Lake Basin in northern China, providing quantitative assessments of Holocene monsoonal precipitation and the consequent mi-grations of the northern boundary of the EASM. Our reconstruction, informed by a water-and-energy balance model, indicates that annual precipitation reached -700 mm during 8-5 ka, followed by a rapid decline to -550 mm be-tween 5 and 4 ka. This shift coherently aligns with a significant -300 km northwestward movement of the EASM northern boundary during the Middle Holocene (MH), in contrast to its current position. Our findings underscore that these changes cannot be entirely attributed to orbital forcing, as corrob-orated by simulation tests. Climate model simulations deployed in our study suggest that the presence of the Green Sahara during the MH significantly strengthened the EASM and led to a northward shift of the monsoon rainfall belt. Conversely, the Sahara's reversion to a desert landscape in the late Ho-locene was accompanied by a corresponding southward retraction of monsoon influence. These dramatic hydroclimate changes during -5-4 ka likely triggered or at least contributed to a shift in Neolithic cultures and societal transformation in northern China. With decreasing agricultural pro-ductivity, communities transitioned from millet farming to a mixed rainfed agriculture and animal husbandry system. Thus, our findings elucidate not only the variability of the EASM but also the profound implications of a remote forcing, such as surface transformations of the Sahara, on climatic changes and cultural evolution in northern China.

Ämnesord

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)

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Av författaren/redakt...: Hou, Yandong; Long, Hao; Tsukamoto, Sumik ...; Lu, Zhengyao; Chen, Jie; Ibarra, Daniel E ...; visa fler...; Tamura, Toru; Zhang, Qiong, 19 ...; Sun, Weiyi; Zhang, Jingran; Gao, Lei; Frechen, Manfred; Shen, Ji; visa färre...

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NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Annan geovetensk ...

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Klimatforskning

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Av lärosätet: Stockholms universitet; Lunds universitet

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