Vegetation and precipitation change inferred from the 8 13 C and 8 2 H values of n-alkanes from lake sediment from 18 cal ka BP, tropical NE Australia

Li, Ting1,2,3; Zhou, Youping4,5; Wurster, Chris M.1,2,6; Zhou, Xiuwen4; Zhao, Yu4; Comley, Rainy1,2; Munksgaard, Niels C.1,2; Cernusak, Lucas A.1,3; Haig, Jordahna1; Bird, Michael I.1,2

2024-08-01

10.1016/j.quascirev.2024.108807

QUATERNARY SCIENCE REVIEWS   影响因子和分区

0277-3791

1873-457X

The carbon and hydrogen isotope compositions (8 13 C and 8 2 H) of sedimentary n-alkanes are excellent recorders of past vegetation and precipitation change. Yet, few studies have combined and compared n-alkanes in modern plants and paleoenvironmental records. Here we analyzed the 8 13 C and 8 2 H values of n-alkanes (8 13 C alk and 8 2 H alk , respectively) from a 7-m-long sediment sequence in Lake Barrine, modern catchment soils, fallen leaf mixtures, rainforest tree leaves and grasses from tropical northeastern Australia. We exploited the correlation between the relative abundances, 8 13 C, and 8 2 H values of n-alkanes from fresh modern rainforest leaves, grasses, fallen leaves, soils and surface sediments. Based on this, we developed two binary mixing models to determine C 3 plant abundances and the 8 2 H values of precipitation (8 2 H P-R ) to study rainfall and vegetation in the Lake Barrine catchment since 18.3 cal ka BP. Combining the results of this study with mean annual air temperature, pollen, and clastic influx, we reconstructed a robust climatic and environmental record for this site and compared it with other regional paleoenvironmental records. The modern samples indicate slight 13 C enrichment and obvious 2 H depletion in the n-alkanes from fresh rainforest leaves, fallen leaves, soils, and surface sediments, which is possibly due to microbial build-up of n-alkanes during decomposition. A broad consistency in regional paleoclimate trends was identified, including a cool, dry Last Glacial Maximum (23-17.0 cal ka BP), warmer, wetter last deglacial (17.0-14.9 cal ka BP), wetter with stable temperature Antarctic cold reversal (14.9-12.8 cal ka BP), (possibly) cooler, drier Younger Dryas (12.8-11.6 cal ka BP), warmer, wetter early-to-middle Holocene (11.6-5 cal ka BP) and cooler, slightly drier and more variable late Holocene (5 cal ka BP to the present).

Paleoenvironment n -Alkanes Carbon and hydrogen isotopes Lake sediment Tropical NE Australia

SCI ; EI

英语

其他

Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage[CE170100015] ; National Natural Science Foundation of China["41973072","42250203"]

Physical Geography ; Geology

Geography, Physical ; Geosciences, Multidisciplinary

WOS:001265987600001

PERGAMON-ELSEVIER SCIENCE LTD

20242816659388

Carbon ; Catchments ; Hydrogen ; Isotopes ; Paraffins ; Runoff ; Sediments ; Soils ; Tropics ; Vegetation

Flood Control:442.1 ; Meteorology:443 ; Surface Water:444.1 ; Soil Mechanics and Foundations:483 ; Soils and Soil Mechanics:483.1 ; Chemical Products Generally:804

GEOSCIENCES

Web of Science

1.James Cook Univ, Coll Sci & Engn, Cairns 4878, Australia
2.James Cook Univ, ARC Ctr Excellence Australian Biodivers & Heritage, Cairns 4878, Australia
3.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
4.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Isotop Chem & Biol Oceanog ICBO, Shenzhen 518055, Peoples R China
5.Shaanxi Univ Sci & Technol, Sch Chem & Chem Engn, Isotop Chem Biol ICB, Xian 710021, Peoples R China
6.Ruakura Res Ctr, Analyt Labs, Private Bag 3345, Hamilton 3240, New Zealand

Li, Ting,Zhou, Youping,Wurster, Chris M.,et al. Vegetation and precipitation change inferred from the 8 13 C and 8 2 H values of n-alkanes from lake sediment from 18 cal ka BP, tropical NE Australia[J]. QUATERNARY SCIENCE REVIEWS,2024,337.

Li, Ting.,Zhou, Youping.,Wurster, Chris M..,Zhou, Xiuwen.,Zhao, Yu.,...&Bird, Michael I..(2024).Vegetation and precipitation change inferred from the 8 13 C and 8 2 H values of n-alkanes from lake sediment from 18 cal ka BP, tropical NE Australia.QUATERNARY SCIENCE REVIEWS,337.

Li, Ting,et al."Vegetation and precipitation change inferred from the 8 13 C and 8 2 H values of n-alkanes from lake sediment from 18 cal ka BP, tropical NE Australia".QUATERNARY SCIENCE REVIEWS 337(2024).