The Holocene temperature conundrum answered by mollusk records from East Asia

Dong, Yajie; Wu, Naiqin; Li, Fengjiang; Zhang, Dan; Zhang, Yueting; Shen, Caiming; Lü, Houyuan

doi:10.1038/s41467-022-32506-7

Cited by 64 publications

(21 citation statements)

References 62 publications

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“…As for the mean annual temperature, brGDGTs records from Gushantun and Hani peat in NE China (Zheng et al, 2017, 2018) show a cooling trend during Holocene (Figure 4e and f). In addition, the MAT records based on terrestrial mollusk assemblages from North China (Dong et al, 2022) and based on an extensive pollen dataset from the Northern Hemisphere (Zhang et al, 2022) (Figure 5d) suggested a trend of warming during the early-middle Holocene and cooling during the middle-late Holocene. The brGDGTs records from Gushantun and Hani peat contradicted the records based on mollusk and pollen probably because the brGDGTs records from NE China carried more summer-inferred temperature information rather than the MAT.…”

Section: Resultsmentioning

confidence: 99%

“…However, Pinus pollen percentages in NE China did not increase after ~2–3 cal ka BP, which is inconsistent with the atmospheric CO 2 that kept rising since ~7–6 cal ka BP (Bereiter et al, 2015) (Figure 5j). The MAT variability is the superposition of summer and winter temperature variability (Dong et al, 2022). Before ~7–6 cal ka BP, the annual insolation was changing very slowly at that time as the summer and winter insolation were following opposite trends (Laskar et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

“…The frozen condition restrains the growth of brGDGTs production bacteria (Zhu et al, 2021). Therefore, the MAT change trend during Holocene probably is warming during the early-middle Holocene and cooling during the middle-late Holocene as shown by Dong et al (2022) and Zhang et al (2022).…”

Section: The Amplitude Of Holocene Summer Temperature Changes and The...mentioning

confidence: 98%

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Holocene summer temperature record based on branched tetraethers in Northeast China

Zhu,

Wu,

et al. 2023

The Holocene

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The temperature evolution during the Holocene shows conflicting patterns and yields the controversy regarding whether the Holocene followed a warming or cooling trend. Resolving this controversy is critical for understanding the underlying mechanisms of climate change and evaluating global warming on a longer timescale. Here we present a quantitative summer temperature reconstruction based on branched glycerol dialkyl glycerol tetraethers analyzed from a sedimentary sequence retrieved from the volcanic lake Kielguo crater lake in Northeast (NE) China. Our record revealed that the summer temperature in NE China followed a rough cooling trend during ~10–2.2 cal ka BP and increased after ~2.2 cal ka BP. The warmest period appeared at ~10–8.8 cal ka BP with ~15.8°C, and the coldest time occurred at ~2.3 cal ka BP with ~13.4°C. Compared with other temperature records from NE China, we conclude that the summer and winter temperature change trends in NE China were probably controlled by the summer and winter insolation respectively, and the ice volume. The mean annual temperature changes in NE China resulted from the superposition of summer cooling and winter warming during the Holocene, and the decrease in ice volume forcing the increase in mean annual temperatures before ~7–6 cal ka BP. The switch in mean annual temperature changes was probably linked with the collapse of Northern Hemisphere ice sheets.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Holocene summer temperature record based on branched tetraethers in Northeast China

Zhu,

Wu,

et al. 2023

The Holocene

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“…These data were compared to regional climatic background information, that is, the mean annual temperatures reconstructed by mollusk records from the loess paleosol profile at Jingchuan, located at ca. 100 km north of Daye Lake (Figures 4c; Dong et al, 2022), together with the stalagmite records of Dongge and Haozhu caves, which are considered as the index of EASM (Figure 4d, Yuan et al, 2004;Zhang et al, 2018). Biofuel changes are also considered here indicated by the ratio of wood to herb burning from micro-charcoals (Figure 4f).…”

Section: Climate and Vegetation Influenced The Fire Activitymentioning

confidence: 99%

Fire History in the Qinling Mountains of East‐Central China Since the Last Glacial Maximum

Zhang

Cui

Blockley

et al. 2023

Geophysical Research Letters

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Fire is an important component of ecosystem functioning and is closely related to climate, vegetation and biochemical cycles (Nolan et al., 2020;Pechony & Shindell, 2010). Fire frequency and intensity have increased with human-induced global warming in forested landscapes in recent years (Carter et al., 2018;Parks & Abatzoglou, 2020). Li et al. (2017) suggested fire-induced changes in terrestrial ecosystems have significantly increased the global average land surface temperature by 0.18°C in the 20th century. Mitigating the warming climate heavily depends on carbon storage in forests (Grassi et al., 2017;Yu et al., 2022). However, fire is the key disturbance factor in forest cover (Flannigan et al., 2009;Wu et al., 2014) and high-intensity fires usually occur in forested regions and transform forest communities from "carbon sinks" into "carbon sources" (Huang et al., 2020;Ying et al., 2018). The GFED3 model showed that CO 2 generated from deforestation fires accounts for about one third of the total CO 2 flux (Prentice et al., 2011). The fire mechanisms include a combination of factors operating on a range of timescales. The short observational period is not sufficient to fully capture the overall factors of fires occurrence in a region, it is thus crucial to study fire history at the longer time scales. This information can then provide detailed understanding on aspects of warming induced fire in the past, the balance of fuel source versus climate forcing, and the influence of anthropogenic activities on fires in forested regions.The Qinling Mountains are dominated by forest cover and are close to the boundary where subtropical vegetation in the south alternates with temperate vegetation in the north, making the mountains an important ecological zone in China (Yao et al., 2020). Frequent fire events have been recorded in recent decades, which influenced the

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“…Figure 3. Comparison of climate indexes from the Chinese Loess Plateau and ML/MR ratio results: (a), (b) synthesized MCL/MCR ratios (SLR) of the five sites and synthesized herb pollen (SHP) across the Loess Plateau based on the LOWESS fitting (this study); (c) moisture reconstructed on the central (purple) and the western Chinese Loess Plateau (light blue) (Gao et al, 2019); (d) pollen-based annual precipitation (Pann) reconstructed from Gonghai Lake(Chen et al, 2015); (e), (f) mean annual temperature (MAT) reconstructed in Yaoxian and Jingchuan(Dong et al, 2022), where the red line represents the LOESS fitting; (g) the synthesized fire history across the Loess Plateau (this study); (h) the human influence index (HII) based on pollen data from Lake Tianchi on the Loess Plateau; (i) number of archeological sites on the Chinese Loess Plateau(Hosner et al, 2016). The green shaded areas and green hollow dots/triangles in (a) and (b) indicate 95% confidence intervals.…”

mentioning

confidence: 99%

Microcharcoals Reveal More Grass Than Trees During the Mid‐Holocene Optimum on the Chinese Loess Plateau

Wang,

Miao,

Zou

et al. 2023

Geophysical Research Letters

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Microcharcoal morphology, which changes with biofuel type in the wildfire, can be used as an index for wildfire history and vegetation evolution. Here, five loess sites across the Chinese Loess Plateau were used to establish the biofuel history of the region during the Holocene based on microcharcoal morphological records. The results suggested that consistently increasing grass biofuel dominated the mid‐Holocene (∼7,500–3,000 yr BP), and the grassland or steppe expanded in the same interval. Since the climate conditions with simultaneous high precipitation and temperature of the mid‐Holocene are the most recent paleoclimate analog for future warming, we argue that the humid and warm conditions expected under future global warming on the Loess Plateau might lead to an increase in the grass rather than trees.

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The Holocene temperature conundrum answered by mollusk records from East Asia

Cited by 64 publications

References 62 publications

Holocene summer temperature record based on branched tetraethers in Northeast China

Holocene summer temperature record based on branched tetraethers in Northeast China

Fire History in the Qinling Mountains of East‐Central China Since the Last Glacial Maximum

Microcharcoals Reveal More Grass Than Trees During the Mid‐Holocene Optimum on the Chinese Loess Plateau

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