Alkenone sea surface temperature from the Chiba Composition Section
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2024
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| _version_ | 1867171891312066560 |
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| author | Kajita, Hiroto Suganuma, Yusuke Haneda, Yuki Okada, Makoto Yamamoto, Masanobu Seki, Osamu Ohkouchi, Naohiko |
| author_facet | Kajita, Hiroto Suganuma, Yusuke Haneda, Yuki Okada, Makoto Yamamoto, Masanobu Seki, Osamu Ohkouchi, Naohiko |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This study displays the high-time resolution of paleo-sea surface temperature (SST) covering the marine isotope stage (MIS) 19 based on the unsaturation ratio of long-chain alkenones (UK'37) retrieved from the Chiba Composition Section (CbCS), central Japan. The CbCS consists of five sections: the Yoro River (35°17.41N; 140°08.48E), Yoro-Tabuchi (35°17.41N; 140°08.49E) and Urajiro (35°16.85N; 140°07.47E) sections. A total of 149 samples were processed for biomarker analyses from the Yoro-Tabuchi (ID: TB2-xx), Yoro River (ID: YT-xxx and TB-xxx), and Urajiro (ID: YW-xxx) sections of the CbCS. Please see Haneda et al. (2020, doi:10.1016/j.epsl.2019.115936) for the sample stratigraphy. After the surface was cleaned ultrasonically with ethanol, it was freeze-dried and ground into a fine powder. The powdered sediment (6-7 g) was extracted via ultrasonication with dichloromethane, dichloromethane/methanol (1:1, v/v), and methanol. The combined supernatant was dried under N2 gas and extracted with n-hexane from distilled water to obtain the neutral components. The extracted lipids were separated into four subfractions via silica gel column chromatography. The hydrocarbon fraction was eluted with n-hexane/dichloromethane (95:5, v/v). Then, the ketone fraction was eluted with n-hexane/dichloromethane (1:4, v/v) for alkenone analysis. Then, the ketones' fraction was introduced into a gas chromatograph with a mass-selective detector and a flame ionization detector (model 7890A, Agilent Technology) equipped with a VF-5ms fused silica capillary column (30 m × 0.25 mm internal diameter with 0.25 μm film, Agilent Technology). The oven temperature was programmed as follows: maintained at 40 °C for 2 min, raised to 120 °C at 30 °C/min, raised to 300 °C at 6 °C/min, and maintained at 300 °C for 20 min. Alkenone unsaturation ratios (UK'37) were converted into SSTs (℃) using the following calibration. SST = (UK'37 - 0.039)/0.034 |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_971475 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Alkenone sea surface temperature from the Chiba Composition Section Kajita, Hiroto Suganuma, Yusuke Haneda, Yuki Okada, Makoto Yamamoto, Masanobu Seki, Osamu Ohkouchi, Naohiko According to Suganuma et al. (2018); AGE; alkenone SST; Chiba Composition Section; Event label; Japan; Latitude of event; Longitude of event; Marine Isotope Stage 19; OUTCROP; Outcrop sample; Sample ID; Sea surface temperature; SST, from UK'37; Urajiro; Yoro_River; Yoro-Tabuchi This study displays the high-time resolution of paleo-sea surface temperature (SST) covering the marine isotope stage (MIS) 19 based on the unsaturation ratio of long-chain alkenones (UK'37) retrieved from the Chiba Composition Section (CbCS), central Japan. The CbCS consists of five sections: the Yoro River (35°17.41N; 140°08.48E), Yoro-Tabuchi (35°17.41N; 140°08.49E) and Urajiro (35°16.85N; 140°07.47E) sections. A total of 149 samples were processed for biomarker analyses from the Yoro-Tabuchi (ID: TB2-xx), Yoro River (ID: YT-xxx and TB-xxx), and Urajiro (ID: YW-xxx) sections of the CbCS. Please see Haneda et al. (2020, doi:10.1016/j.epsl.2019.115936) for the sample stratigraphy. After the surface was cleaned ultrasonically with ethanol, it was freeze-dried and ground into a fine powder. The powdered sediment (6-7 g) was extracted via ultrasonication with dichloromethane, dichloromethane/methanol (1:1, v/v), and methanol. The combined supernatant was dried under N2 gas and extracted with n-hexane from distilled water to obtain the neutral components. The extracted lipids were separated into four subfractions via silica gel column chromatography. The hydrocarbon fraction was eluted with n-hexane/dichloromethane (95:5, v/v). Then, the ketone fraction was eluted with n-hexane/dichloromethane (1:4, v/v) for alkenone analysis. Then, the ketones' fraction was introduced into a gas chromatograph with a mass-selective detector and a flame ionization detector (model 7890A, Agilent Technology) equipped with a VF-5ms fused silica capillary column (30 m × 0.25 mm internal diameter with 0.25 μm film, Agilent Technology). The oven temperature was programmed as follows: maintained at 40 °C for 2 min, raised to 120 °C at 30 °C/min, raised to 300 °C at 6 °C/min, and maintained at 300 °C for 20 min. Alkenone unsaturation ratios (UK'37) were converted into SSTs (℃) using the following calibration. SST = (UK'37 - 0.039)/0.034 |
| title | Alkenone sea surface temperature from the Chiba Composition Section |
| topic | According to Suganuma et al. (2018); AGE; alkenone SST; Chiba Composition Section; Event label; Japan; Latitude of event; Longitude of event; Marine Isotope Stage 19; OUTCROP; Outcrop sample; Sample ID; Sea surface temperature; SST, from UK'37; Urajiro; Yoro_River; Yoro-Tabuchi |
| url | https://doi.org/10.1594/PANGAEA.971475 |