Coupled Impacts of Atmospheric Circulation and Sea‐Ice on Late Pleistocene Terrigenous Sediment Dynamics in the Subarctic Pacific Ocean

Zhong, Yi; Liu, Yanguang; Gong, Xun; Wilson, David J.; Lu, Zhengyao; Liu, Jiabo; Song, Tengfei; Gorbarenko, Sergey A; Shi, Xuefa; Yang, Xiaoqiang; Liu, Qingsong

doi:10.1029/2021gl095312

Cited by 8 publications

(3 citation statements)

References 79 publications

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“…During times of high obliquity, the midlatitudes at the top of the atmosphere receive relatively less radiation and poles at the top of the atmosphere receive more (Mohtadi et al., 2016), creating a weaker meridional insolation or high‐level atmospheric temperature gradient (Cruz et al., 2006; Loutre et al., 2004) and furtherly weakening the high‐level westerlies (Frisch et al., 2019). A strong obliquity signal has also been revealed in dust flux records from the subarctic Pacific Ocean (Zhong et al., 2024), where dust is transported by high‐level westerlies. Although high dust activity occurred in the southern TP during ∼58–47 ka, the weak high‐level westerlies could not have transported substantial dust to Greenland.…”

Section: Discussionmentioning

confidence: 77%

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Cheng,

Long,

Zhang

et al. 2024

JGR Earth Surface

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The Tibetan Plateau (TP) serves not only as the “water tower” of Asia but also as an important source in the global atmospheric dust cycle. While our knowledge of modern dust activity and its impacts and interactions with climate change in the TP has greatly advanced in the past decades, the emission, transport, and deposition of dust on the geological time scale remains unclear. This study analyzed a 7.6‐m thick sedimentary sequence consisting of loess and sand from the Yarlung Tsangpo River (YTR) valley in the southern TP. The sequence chronology was established using nineteen K‐feldspar post‐infrared infrared stimulated luminescence (pIRIR) ages, which ranged from 47.11 ± 1.95 to 116.65 ± 5.55 ka in a general stratigraphical order. The dust sedimentation rate and sorting coefficient of grain size were used to reflect dust activity and near‐surface wind, respectively. The results indicated that dust activity in the southern TP is mainly regulated by the near‐surface wind intensity and follows the variation pattern of precession, although the waxing and waning of mountain glaciers also affect the amplitude of dust activity. This pattern is not consistent with the Greenland dust record, which follows the variation pattern of obliquity. Therefore, dust accumulation in the southern TP is concluded to be primarily controlled by the South Asian winter monsoon (SAWM) forced by precession, whereas dust accumulation in Greenland is closely related to the intensity of the high‐level westerlies forced by obliquity.

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Section: Discussionmentioning

confidence: 77%

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Cheng,

Long,

Zhang

et al. 2024

JGR Earth Surface

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“…The 6.88 m long sediment sequence is dominated by fine-grained silt and clay, with occasional volcanic ash layers. The age model for Core LV63-4-2 is based on six AMS 14 C dates (for the upper part) in combination with planktonic foraminiferal oxygen isotope stratigraphy, paleomagnetic events, tephrochronology, and the correlation of sediment lightness proxy data to carbonate content data from Ocean Drilling Program (ODP) Site 882 (Jaccard et al, 2010;Liu et al, 2022;Zhong et al, 2020Zhong et al, , 2021 (Figure S2 in Supporting Information S1).…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we present a new high-resolution eolian dust record spanning the past 190 kyr based on sediments from gravity Core LV63-4-2 that was recovered from the slopes of Detroit Seamount in the Subarctic Pacific Ocean (Zhong et al, 2020(Zhong et al, , 2021; Figure 1). Both precession-and obliquity-paced dust fluctuations are identified in this record.…”

Section: Introductionmentioning

confidence: 99%

Orbital Controls on North Pacific Dust Flux During the Late Quaternary

Zhong,

Liu,

Yang

et al. 2024

Geophysical Research Letters

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Airborne mineral dust is sensitive to climatic changes, but its response to orbital forcing is still not fully understood. Here, we present a reconstruction of dust input to the Subarctic Pacific Ocean covering the past 190 kyr. The dust composition record is indicative of source moisture conditions, which were dominated by precessional variations. In contrast, the dust flux record is dominated by obliquity variations and displays an out‐of‐phase relationship with a dust record from the mid‐latitude North Pacific Ocean. Climate model simulations suggest precession likely drove changes in the aridity and extent of dust source regions. Additionally, the obliquity variations in dust flux can be explained by meridional shifts in the North Pacific westerly jet, driven by changes in the meridional atmospheric temperature gradient. Overall, our findings suggest that North Pacific dust input was primarily modulated by orbital‐controlled source aridity and the strength and position of the westerly winds.

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Paleoclimate evolution of the North Pacific Ocean during the late Quaternary: Progress and challenges

Zhong¹,

Lu²,

Wilson³

et al. 2023

Geosystems and Geoenvironment

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Coupled Impacts of Atmospheric Circulation and Sea‐Ice on Late Pleistocene Terrigenous Sediment Dynamics in the Subarctic Pacific Ocean

Cited by 8 publications

References 79 publications

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Orbital Controls on North Pacific Dust Flux During the Late Quaternary

Paleoclimate evolution of the North Pacific Ocean during the late Quaternary: Progress and challenges

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