Response of vegetation in central Japan to precession during the last 147,000 years: A lignin record from Lake Biwa core BIW08-B

Ohira, Fukashi; Yamamoto, Masanobu; Takemura, Keiji; Hayashida, Akira

doi:10.1016/j.quaint.2013.10.059

Cited by 11 publications

(19 citation statements)

References 39 publications

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“…6). Ohira et al (2013) reported a spike of abundant lignin at the same layer in core BIW08-B. Because of low-CBT-based pH (3.3 to 8.0 with an average of 5.0; Ajioka et al, 2014) due to high CBT in the soils, the high CBT (low estimated pH) at 13 ka associated with high lignin abundance likely reflected the soil GDGT contribution.…”

Section: Changes In Lake Water Ph During the Last 280 Kymentioning

confidence: 97%

“…Proxies applicable to lake sediments include pollen and diatom fossils, δD of long-chain n-alkanes, lignin, biogenic opal, and pigments, among others. In Lake Biwa, sediment cores have been investigated using pollen fossils (Miyoshi et al, 1999;Nakagawa et al, 2008), lignin T. Ajioka et al: MBT /CBT indices (Ishiwatari and Uzaki, 1987;Ishiwatari et al, 2009;Ohira et al, 2013), diatom frustules (Kuwae et al, 2004), biogenic opal (Xiao et al, 1997), pigments (Ishiwatari et al, 2009), and δD of long-chain n-alkanes (Seki et al, 2012). Although palaeoclimate information is available from these proxy records, more records generated by other new proxies are necessary to better understand the response of the East Asian monsoon to orbital forcing.…”

Section: Introductionmentioning

confidence: 99%

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Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 282 000 years

Ajioka¹,

Yamamoto²,

Takemura³

et al. 2014

Preprint

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Abstract. We generated a 282 000-year record of water pH and temperature in Lake Biwa, central Japan, by analysing the methylation index (MBT') and cyclisation ratio (CBT) of branched tetraethers in sediments from piston and borehole cores to understand the responses of precipitation and air temperature in central Japan to the East Asian monsoon variability on the orbital timescale. Because water pH in Lake Biwa is determined by phosphorus input driven by precipitation, the record of water pH should indicate changes in summer precipitation in central Japan. The estimated pH showed significant periodicity at 19 and 23 ka (precession) and at 41 ka (obliquity). The variation in the estimated pH agrees with variation in the pollen temperature index. This indicates synchronous variation in summer air temperature and precipitation in central Japan, which contradicts the conclusions of previous studies. The variation in estimated pH was also synchronous with the variation of oxygen isotopes in stalagmites in China, suggesting that East Asian summer monsoon precipitation was governed by Northern Hemisphere summer insolation on orbital timescales. However, the estimated winter temperatures were higher during interglacials and lower during glacials, showing an eccentricity cycle. This suggests that the temperature variation reflected winter monsoon variability.

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Section: Changes In Lake Water Ph During the Last 280 Kymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 282 000 years

Ajioka¹,

Yamamoto²,

Takemura³

et al. 2014

Preprint

View full text Add to dashboard Cite

show abstract

Section: Changes In Lake Water Ph During the Last 280 Kymentioning

confidence: 99%

“…Proxies applicable to lake sediments include pollen and diatom fossils, δD of long-chain n-alkanes, lignin, biogenic opal, and pigments, among others. In Lake Biwa, sediment cores have been investigated using pollen fossils (Miyoshi et al, 1999;Nakagawa et al, 2008), lignin (Ishiwatari and Uzaki, 1987;Ishiwatari et al, 2009;Ohira et al, 2013), diatom frustules (Kuwae et al, 2004), biogenic opal (Xiao et al, 1997), pigments (Ishiwatari et al, 2009), and δD of long-chain n-alkanes (Seki et al, 2012). Although palaeoclimate information is available from these proxy records, more records generated by other new proxies are necessary to better understand the response of the East Asian monsoon to orbital forcing.…”

Section: Introductionmentioning

confidence: 99%

Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 280 000 years

et al. 2014

View full text Add to dashboard Cite

Abstract. We generated a 280 000 yr record of water pH and temperature in Lake Biwa, central Japan, by analysing the methylation index (MBT ) and cyclisation ratio (CBT) of branched tetraethers in sediments from piston and borehole cores. Our aim was to understand the responses of precipitation and air temperature in central Japan to the East Asian monsoon variability on orbital timescales. Because the water pH in Lake Biwa is determined by phosphorus and alkali cation inputs, the record of water pH should indicate the changes in precipitation and temperature in central Japan. Comparison with a pollen assemblage in a Lake Biwa core suggests that lake water pH was determined by summer temperature in the low-eccentricity period before 55 ka, while it was determined by summer precipitation in the higheccentricity period after 55 ka. From 130 to 55 ka, the variation in lake pH (summer precipitation) lagged behind that in summer temperature by several thousand years. This perspective is consistent with the conclusions of previous studies (Igarashi and Oba, 2006;Yamamoto, 2009), in that the temperature variation preceded the precipitation variation in central Japan.

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“…Tp values refer to Kanauchi et al (2007). Figure 11 shows the S/V ratios in core TKN-2004 and other two cores, i.e., core BIW08-B from Lake Biwa in central Japan (Ohira et al, 2014) and core MD01-2421 off central Japan in the northwestern Pacific . All of these records showed good agreement, except in the MIS 6 to MIS 5d in MD01-2421 (Fig.…”

Section: Changes In the Contributions Of Gymnosperms And Angiospermsmentioning

confidence: 99%

Late Pleistocene variation in lignin and fatty acids from core TKN-2004 in a small mountain basin in central Japan

2014

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We generated a record of lignin and fatty acid compositions from the TK-2004 core in Takano Basin, central Japan, during 39-162 ka by TMAH-thermochemolysis-GC/MS. We tested lignin and fatty acid compositions in the sediments of a small lake (1.88 km 2 watershed) as a paleovegetation proxy to understand the responses of terrestrial vegetation in central Japan to global climate change. Variation in terrestrial organic carbon contents estimated by C/N and ∑8 was parallel to the total organic content (TOC) variation, suggesting that the inflow of terrestrial organic matter was a major factor determining the TOC. The ratio of mid-chain C 20 -C 24 n-fatty acids to short-chain C 14 -C 18 n-fatty acids (MFA/SFA ratio) and the ratio of cinnamyl to vanillyl phenols (C/V ratio) of lignin gradually increased from mid-MIS 6 to early MIS 3. The increase in both parameters suggested increase in the contribution of submerged and floating plants as the flats were expanded in the lake margin. The ratio of syringyl to vanillyl phenols (S/V ratio) corresponded to the pollen vegetation index. This correspondence indicated that the S/V ratio reflected the relative abundance of angiosperms to gymnosperms in the Takano Basin. The consistency of the S/V ratio at the site of core TKN-2004 and the other two locations suggests that the S/V ratio in a small basin is a robust proxy for terrestrial vegetation on a regional scale.

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Response of vegetation in central Japan to precession during the last 147,000 years: A lignin record from Lake Biwa core BIW08-B

Cited by 11 publications

References 39 publications

Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 282 000 years

Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 282 000 years

Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 280 000 years

Late Pleistocene variation in lignin and fatty acids from core TKN-2004 in a small mountain basin in central Japan

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