TY - JOUR
T1 - Southward migration of the monsoonal rainbelt hinders paleosol development and preservation in north-central China dunefield after the Middle-Late Holocene Transition
AU - Shu, Peixian
AU - Kang, Shugang
AU - Shi, Zhengguo
AU - Grimley, David A.
AU - Zhang, Zeke
AU - Zhao, Jiaju
AU - Wang, Hong
AU - Zhou, Weijian
AU - An, Zhisheng
N1 - Funding Information:
This study was supported by the Science and Technology Innovation Project of Laoshan Laboratory (No. LSKJ202203300 ), the Strategic Priority Research Program of Chinese Academy of Sciences (CAS) (Grant No. XDB 40000000 ), National Natural Science Foundation of China (No. 42030512 , No. 42102237 ), the Ministry of Science and Technology of China (2019YFC1509100), the Youth Innovation Promotion Association CAS (to Shugang Kang) and the international partnership program of CAS (Grant No. 132B61KYSB20170005 ). P. Shu also acknowledges the support of special research assistant project of Chinese Academy of Sciences .
Publisher Copyright:
© 2022
PY - 2023/2/1
Y1 - 2023/2/1
N2 - The Asian summer monsoon (ASM), including the intensity and range limits of it's associated rainfall belt, is relevant to ecosystems, agriculture, natural hazards and water availability for millions of people in this region. However, understanding of the pattern of dunefield changes near the northern limit of the East Asian summer monsoon (EASM) since Middle to Late Holocene Transition (MLHT, ∼6 to 4 ka) is still lacking. Here, we compile and analyze the sedimentology and chronology of regional dune and lake records in the Hunshandake Sandy Land (HSL). Based on prior work and confirmed by additional OSL and 14C ages, paleosol development intercalated with dune sand is found southeastern and central parts of the HSL after 4 ka. However, based on new chronological data, a paleosol complex is generally absent in the northwestern HSL after 4 ka. Together with independent high-resolution transient model simulations of summer rainfall change, we interpret a shift of the far northwestern HSL dunefield system approximately coincided with the mid-summer limit of the EASM rainbelt that retreated southward after 4 ka. Thus, we hypothesize that the southward migration of the northernmost monsoonal rainbelt after the MLHT was a first-order control on dunefields change over the far northwestern HSL. Coupled with a southward migrating rainbelt, we interpret a decrease in external sand supply (due to covering by clay) and an increase in contemporaneous seasonal eolian deflation caused by the drier hydroclimatic conditions. This climatic-driven dune system shift in the far northwestern HSL is shortly after the more globally recognized 4.2 ka event, which marks the boundary between the Middle Holocene and Late Holocene.
AB - The Asian summer monsoon (ASM), including the intensity and range limits of it's associated rainfall belt, is relevant to ecosystems, agriculture, natural hazards and water availability for millions of people in this region. However, understanding of the pattern of dunefield changes near the northern limit of the East Asian summer monsoon (EASM) since Middle to Late Holocene Transition (MLHT, ∼6 to 4 ka) is still lacking. Here, we compile and analyze the sedimentology and chronology of regional dune and lake records in the Hunshandake Sandy Land (HSL). Based on prior work and confirmed by additional OSL and 14C ages, paleosol development intercalated with dune sand is found southeastern and central parts of the HSL after 4 ka. However, based on new chronological data, a paleosol complex is generally absent in the northwestern HSL after 4 ka. Together with independent high-resolution transient model simulations of summer rainfall change, we interpret a shift of the far northwestern HSL dunefield system approximately coincided with the mid-summer limit of the EASM rainbelt that retreated southward after 4 ka. Thus, we hypothesize that the southward migration of the northernmost monsoonal rainbelt after the MLHT was a first-order control on dunefields change over the far northwestern HSL. Coupled with a southward migrating rainbelt, we interpret a decrease in external sand supply (due to covering by clay) and an increase in contemporaneous seasonal eolian deflation caused by the drier hydroclimatic conditions. This climatic-driven dune system shift in the far northwestern HSL is shortly after the more globally recognized 4.2 ka event, which marks the boundary between the Middle Holocene and Late Holocene.
KW - East asian summer monsoon rainbelt
KW - Eolian dune sediments
KW - Middle-late Holocene transition
KW - Paleosol complex
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U2 - 10.1016/j.quascirev.2022.107919
DO - 10.1016/j.quascirev.2022.107919
M3 - Article
AN - SCOPUS:85144435177
SN - 0277-3791
VL - 301
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
M1 - 107919
ER -