MIS 21 and the Mid-Pleistocene climate transition: Climate and sea-level variation from a sediment core in Osaka Bay, Japan

Kitaba, Ikuko; Harada, Mao; Hyodo, Masayuki; Katoh, Shigehiro; Sato, Hiroshi; Matsushita, Mariko

doi:10.1016/j.palaeo.2010.11.004

Cited by 20 publications

(24 citation statements)

References 41 publications

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“…Deposition of each marine layer begins with a postglacial sea-level rise and is terminated by a sea-level drop moving into a glacial period, passing the Osaka Bay sill (15,18). In MIS 21 the marine layer is separated into two intervals, corresponding to the precession-related cycles (14). The maximum sealevel highstand in each interglacial occurs in the first precessionrelated sea-level rise.…”

Section: Resultsmentioning

confidence: 99%

“…It covers the last 3.1 Ma at a high sedimentation rate (s.r.) (13)(14)(15)(16)(17). The core's age control points between 1,300 ka and 700 ka demonstrate a uniform s.r.…”

mentioning

confidence: 89%

“…(ca. 63 cm/ky) with high linearity (correlation coefficient = 0.999) (14). During interglacial periods, when sea level was above the level of the Kitan Strait sill (Fig.…”

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confidence: 91%

“…S1), marine conditions predominated in the basin; basin waters were lacustrine when sea level fell below the sill, primarily during glacial periods. After 1.25 Ma [marine oxygen isotope stage (MIS) 37], 21 marine incursions into Osaka Bay have been recognized and alternating marine and freshwater layers are correlated with interglacial-glacial (orbital) cycles (14,15). Each marine layer records precession-related sea-level variations (14-16).…”

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confidence: 99%

“…After 1.25 Ma [marine oxygen isotope stage (MIS) 37], 21 marine incursions into Osaka Bay have been recognized and alternating marine and freshwater layers are correlated with interglacial-glacial (orbital) cycles (14,15). Each marine layer records precession-related sea-level variations (14)(15)(16). Small half lock-in depths of magnetization, <10 cm estimated for clays in Osaka Bay (17), and the high s.r.…”

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confidence: 99%

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Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Kitaba

Hyodo

Katoh

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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The climatic effects of cloud formation induced by galactic cosmic rays (CRs) has recently become a topic of much discussion. The CRcloud connection suggests that variations in geomagnetic field intensity could change climate through modulation of CR flux. This hypothesis, however, is not well-tested using robust geological evidence. Here we present paleoclimate and paleoenvironment records of five interglacial periods that include two geomagnetic polarity reversals. Marine oxygen isotope stages 19 and 31 contain both anomalous cooling intervals during the sea-level highstands and the Matuyama-Brunhes and Lower Jaramillo reversals, respectively. This contrasts strongly with the typical interglacial climate that has the temperature maximum at the sea-level peak. The cooling occurred when the field intensity dropped to <40% of its present value, for which we estimate >40% increase in CR flux. The climate warmed rapidly when field intensity recovered. We suggest that geomagnetic field intensity can influence global climate through the modulation of CR flux.ne of the main goals of paleoclimatology is to reveal factors that control the Earth's climate. Besides widely accepted climate drivers such as insolation and air-ocean circulation, the effect of clouds induced by galactic cosmic rays (CRs) has recently become a topic of much interest (e.g., 1, 2). Changes in CR flux may affect cloud cover (3, 4) through charge-related processes such as ion-induced nucleation (5) or its effect on the global electric circuit (6), which in turn affect cloud microphysics and formation/radiation of clouds. This would affect the global heat balance by increasing/decreasing albedo (7). Recent observations and modeling support the link between cloud cover and global temperature on decadal time scales (8). A cooling effect caused by the CR-induced clouds was also observed during the Southern Hemisphere Magnetic Anomaly (9), although the interval of observation was too short to be solid confirmation. Longer-term evidence is needed to confirm the CR flux-climate coupling.An alternative way of testing the CR flux-climate coupling is to examine climate across a huge CR flux change in geological history. The geomagnetic field is a major factor controlling CR flux over longer time scales (10), and geomagnetic reversals are always accompanied by large decreases in field strength, which cause a large increase in CR flux. The Matuyama-Brunhes (MB) and Lower Jaramillo (LJ) geomagnetic polarity reversals provide suitable opportunities for such a test. During these reversals, the field intensity decreased to 10-20% of its present value for several thousand years (11). Additionally, the MB and LJ reversals occurred during interglacial periods, times when the impact of increased cloud cover on climate should be more readily detectable than in glacial periods. In this study, we compare detailed (ca. 200-to 2,000-y resolution) multiproxy climate analyses of five interglacial periods to see whether those with a geomagnetic reversal have unique features, ...

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Section: Resultsmentioning

confidence: 99%

“…It covers the last 3.1 Ma at a high sedimentation rate (s.r.) (13)(14)(15)(16)(17). The core's age control points between 1,300 ka and 700 ka demonstrate a uniform s.r.…”

mentioning

confidence: 89%

“…(ca. 63 cm/ky) with high linearity (correlation coefficient = 0.999) (14). During interglacial periods, when sea level was above the level of the Kitan Strait sill (Fig.…”

mentioning

confidence: 91%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Kitaba

Hyodo

Katoh

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Brief sea‐level fall event and centennial to millennial sea‐level variations during Marine Isotope Stage 19 in Osaka Bay, Japan

Maegakiuchi

Hyodo

Kitaba

et al. 2016

J Quaternary Science

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Detailed sea‐level variation was investigated for Marine Isotope Stage (MIS) 19, based on diatom and grain size analyses of a marine sequence in a core of the Osaka Group. Diatom sea‐level proxies represent precession‐related signals correlated with highstands MIS 19.3 and 19.1, and lowstand MIS 19.2. Astronomical tuning shows the marine sequence has a uniform accumulation rate of about 60 cm ka−1. A rapid sea‐level fall event was found in the earliest MIS 19, demonstrated by several independent sea‐level proxies of diatom and grain size. This event began with a rapid sea‐level drop, followed by a gradual recovery, at about 783–782 ka. A maximum abundance of pelagic diatom taxa at a core depth of 402.20 m evidently shows the highest sea‐level peak in MIS 19, supported by many other proxies. Based on the diatom data, sea‐level change across MIS 19.1 is characterized by centennial to millennial fluctuations. The sea‐level fall event began just after the onset of a cooling event previously reported from the same core. Observations of a comparable sea‐level fall signal in many deep‐sea core records suggest the event is global.

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Hibernation in hominins from Atapuerca, Spain half a million years ago

Bartsiokas

Arsuaga

2020

L'Anthropologie

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MIS 21 and the Mid-Pleistocene climate transition: Climate and sea-level variation from a sediment core in Osaka Bay, Japan

Cited by 20 publications

References 41 publications

Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Midlatitude cooling caused by geomagnetic field minimum during polarity reversal

Brief sea‐level fall event and centennial to millennial sea‐level variations during Marine Isotope Stage 19 in Osaka Bay, Japan

Hibernation in hominins from Atapuerca, Spain half a million years ago

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