A single stage Accelerator Mass Spectrometry at the Atmosphere and Ocean Research Institute, The University of Tokyo

Yokoyama, Yūsuke; Miyairi, Yosuke; Aze, Takahiro; Yamane, Masako; Sawada, Chikako; Ando, Yuka; Natris, Maaike de; Hirabayashi, Shoko; Ishiwa, Takeshige; Sato, Naomi; Fukuyo, Naoto

doi:10.1016/j.nimb.2019.01.055

Cited by 64 publications

(36 citation statements)

References 13 publications

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“…Then, the evolved CO 2 was purified cryogenically and reduced to graphite using the method described in Yokoyama et al (2010). The Δ 14 C values were measured using a single-stage accelerator mass spectrometer (AMS) at the Atmosphere and Ocean Research Institute, the University of Tokyo (Yokoyama et al 2019). The Δ 14 C values are defined as follows (Stuiver and Polach 1977):…”

Section: Chlorophyll a And Its Derivativesmentioning

confidence: 99%

Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan

et al. 2020

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Differential sources of sedimentary organic compounds in a volcanic region were revealed by determining radiocarbon content (Δ14C) of organic compounds in surface sediments from Lake Kawaguchi, at the northern foot of Mount Fuji, central Japan. The Δ14C values of C16 fatty acid (−124‰) and chlorophyll a (Chl a) (−133‰) were similar to the Δ14C of dissolved inorganic carbon (DIC) in surface water (−117‰), suggesting that a significant portion of these compounds originated from modern primary producers with a reservoir age of ~1000 years. On the other hand, a large offset between the Δ14C values of Chl a (−133‰) and those of 132, 173-cyclopheophorbide-a-enol (−169‰) and pheophytin a (−179‰) suggested contributions from older pigments. In addition, the Δ14C of long-chain (C24, C26, and C28) fatty acids (−183 to −75‰) showed a large offset from that of a plant leaf remain (0‰) within sediments, demonstrating that the long-chain fatty acids were affected by substantial contributions from pre-aged terrestrial materials. Overall, the sedimentary organic compounds gave 14C ages older than the plant leaf fragment within sediments; however, the similarity between Δ14C of the C16 fatty acid and DIC implies potential for applying compound-specific radiocarbon analysis as a dating tool in volcanic lake environments.

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Section: Chlorophyll a And Its Derivativesmentioning

confidence: 99%

Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan

et al. 2020

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“…The radiocarbon dating of the six string samples (LHE-14, -15, -16, -17C, -19 and -44) was conducted with an NEC 250 kV single-stage accelerator mass spectrometer (AMS) at the Atmosphere and Ocean Research Institute, The University of Tokyo [17]. The string samples were washed with ultra-pure water and dried.…”

Section: Methodsmentioning

confidence: 99%

ESR and Radiocarbon Dating of Gut Strings from Early Plucked Instruments

Tsukamoto

Takeuchi²,

Tani

et al. 2020

MPs

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Early European plucked instruments have recently experienced a great revival, but a few aspects remain unknown (e.g., the gauge of gut strings). Here we report, for the first time, that the electron spin resonance (ESR) signal intensity of oxidized iron, Fe(III), from gut strings at g = 2 increases linearly with age within a few hundred years. The signal increase in the remaining old strings on early instruments can be used to judge if they are as old as or younger than the instrument. Obtaining the authenticity information of gut strings contributes to the revival of the old instruments and the music.

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“…For samples smaller than 0.3 mgC, a specially designed high vacuum line was used for the preparation 60 . Target graphite was then measured by the single stage accelerator mass spectrometer at AORI 61 .…”

Section: Temporal Evolution Of the Marine Radiocarbon Reservoir Age (R)mentioning

confidence: 99%

Collapse of Eurasian ice sheets 14,600 years ago was a major source of global Meltwater Pulse 1a

Brendryen¹,

Haflidason²,

Yokoyama³

et al. 2019

Preprint

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Rapid sea-level rise caused by the collapse of large ice sheets is a global threat to human societies. In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm/yr during Meltwater Pulse 1a, which coincided with the abrupt Bølling warming event 14,650 yr ago. However, the sources of the meltwater have proven elusive, and the contribution from Eurasian ice sheets has until now been considered negligible. Here we show that marine-based sectors of the Eurasian ice sheet complex collapsed at the Bølling transition and lost an ice volume of between 4.5 and 7.9 m sea level equivalents (95% quantiles) over 500 yr. During peak melting 14,650 - 14,310 yr ago, Eurasian ice sheets lost between 3.3 and 6.7 m sea level equivalents (95% quantiles), thus contributing significantly to Meltwater Pulse 1a. A mean meltwater flux of 0.2 Sv over 300 yr was injected into the Norwegian Sea and the Arctic Ocean during a time when proxy evidence suggests vigorous Atlantic meridional overturning circulation. Our reconstruction of the EIS deglaciation shows that a marine-based ice sheet comparable in size to the West Antarctic ice sheet can collapse in as little as 300-500 years.

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A single stage Accelerator Mass Spectrometry at the Atmosphere and Ocean Research Institute, The University of Tokyo

Cited by 64 publications

References 13 publications

Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan

Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan

ESR and Radiocarbon Dating of Gut Strings from Early Plucked Instruments

Collapse of Eurasian ice sheets 14,600 years ago was a major source of global Meltwater Pulse 1a

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