Decoupled Indian Summer Monsoon Intensity and Effective Moisture Since the Last Glaciation in Southwest China

Zhang, Tingwei; Yang, Xiaoqiang; Peng, Jie; Zhou, Qing; Toney, Jaime L.; Liu, Huiyang; Xie, Yadong

doi:10.1029/2023gl103297

Cited by 1 publication

(1 citation statement)

References 55 publications

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“…However, the relationship between the Hm/Gt ratio and precipitation is not invariable due to mineral dissolution with high precipitation (Abrajevitch & Kodama, 2011; Balsam et al., 2004; Long et al., 2016). The relative concentration of goethite in the surface soil of southwest China, from which Red River origins, shows a linear negative correlation with precipitation owing to the dissolution of goethite with high precipitation (Zhang, Yang, et al., 2023). In contrast, hematite is more resistant to dissolution than goethite (Abrajevitch & Kodama, 2011).…”

Section: Discussionmentioning

confidence: 99%

Magnetic Fingerprints for the Paleoenvironmental Evolutions Since the Last Deglaciation: Evidence From the Northwestern South China Sea Sediments

Sun,

Jiang,

Xiao

et al. 2024

Paleoceanog and Paleoclimatol

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Rapid global changes since the last deglaciation can be well documented in marginal sea sediments, while isolating individual paleoenvironmental signals is still challenging. Here, we identified magnetic minerals and unmixed their variations in sediments from the northwestern South China Sea to decipher environmental variations since the last deglaciation. The variation in the hematite to goethite ratio indicates a relatively drier mid‐Holocene and a wetter early and late Holocene in the Red River catchment. The position shift and intensity variation of Western Pacific Subtropical High may account for the Holocene precipitation changes. A higher chemical weathering intensity accompanied by a relatively more fine‐grained magnetite input during the last deglaciation suggests decoupling of the Asian Summer Monsoon and chemical weathering in the catchment, which might have been caused by the shelf exposure during the deglaciation. In addition, the relative abundance of biogenic magnetite increased with the sea level and possible deep‐water temperature rise. Therefore, magnetic minerals such as hematite, goethite, detrital and biogenic magnetite are markedly potential fingerprints for continent‐ocean environmental changes.

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