Revisiting the Holocene global temperature conundrum

Nature, Journal Year: 2023, Volume and Issue: 614(7948), P. 425 - 435

Published: Feb. 15, 2023

Language: Английский

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Prehistoric population expansion in Central Asia promoted by the Altai Holocene Climatic Optimum

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 29, 2023

How climate change in the middle to late Holocene has influenced early human migrations Central Asian Steppe remains poorly understood. To address this issue, we reconstructed a multiproxy-based history from sediments of Kanas Lake and neighboring Tiewaike southern Altai Mountains. The results show an exceptionally warm during ~6.5-3.6 kyr is indicated by silicon isotope composition diatom silica (δ30Sidiatom) biogenic (BSi) content. During 4.7-4.3 kyr, peak δ30Sidiatom reflects enhanced lake thermal stratification periodic nutrient limitation as concomitant decreasing BSi Our geochemical indicate significantly wet Mountain region 6.5-3.6 corresponding Climatic Optimum (AHCO), which critical for promoting prehistoric population expansion intensified cultural exchanges across steppe Bronze Age.

Language: Английский

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Holocene thermal maximum mode versus the continuous warming mode: Problems of data-model comparisons and future research prospects

Science China Earth Sciences, Journal Year: 2023, Volume and Issue: 66(8), P. 1683 - 1701

Published: June 12, 2023

Language: Английский

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Holocene temperature variability in China

Quaternary Science Reviews, Journal Year: 2023, Volume and Issue: 312, P. 108184 - 108184

Published: June 22, 2023

Language: Английский

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Spatial patterns of Holocene temperature changes over mid-latitude Eurasia

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 19, 2024

Abstract The Holocene temperature conundrum, the discrepancy between proxy-based global cooling and simulated annual warming trends, remains controversial. Meanwhile, reconstructions simulations show inconsistent spatial patterns of terrestrial changes. Here we report alkenone records to address over mid-latitude Eurasia. In contrast with long-term trends in warm season temperatures northeastern China, from southwestern Siberia are characterized by colder conditions before ~6,000 years ago, thus trends. Together existing surrounding regions, infer that airmass might have prevailed interior Eurasian continent during early mid-Holocene, perhaps associated atmospheric response remnant ice sheets. Our results challenge proposed seasonality bias proxies modeled study region, highlighting changes should be re-considered record integrations model simulations, important implications for hydroclimate

Language: Английский

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Reconciling East Asia's mid-Holocene temperature discrepancy through vegetation-climate feedback

Science Bulletin, Journal Year: 2024, Volume and Issue: 69(15), P. 2420 - 2429

Published: April 7, 2024

The term "Holocene temperature conundrum" refers to the inconsistencies between proxy-based reconstructions and transient model simulations, it challenges our understanding of global evolution during Holocene. Climate indicate a cooling trend following Holocene Thermal Maximum, while simulations consistent warming due ice-sheet retreat rising greenhouse gas concentrations. Various factors, such as seasonal biases overlooked feedback processes, have been proposed potential causes for this discrepancy. In study, we examined impact vegetation-climate on anomaly patterns in East Asia mid-Holocene (∼6 ka). By utilizing fully coupled Earth system EC-Earth performing with without dynamic vegetation, objective was isolate influence vegetation changes regional patterns. Our findings reveal that contributed across most Asia, resulting spatially diverse significantly improved model-data agreement. These results highlight crucial role addressing conundrum emphasize its importance simulating accurate climate scenarios.

Language: Английский

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The Indigenous Range of the Tiger (Panthera tigris)

Diversity and Distributions, Journal Year: 2025, Volume and Issue: 31(1)

Published: Jan. 1, 2025

ABSTRACT Aim Indigenous range maps are fundamental documents in biogeography, phylogeny and conservation. We define the indigenous of a species as ecoregions (or parts ecoregions) where was likely found before humans became major factor shaping species' distribution, beginning at time when geographical alignment continents prevailing climate least were) roughly consistent with current conditions. developed structured, generally applicable method to map applied this process tiger ( Panthera tigris ). Location Terrestrial Asia. Methods To guide our mapping, we synthesised database over 70,000 observations dates locations. structured Delphi assign categories aided by niche model. analysed habitat change ecoregional scale using anthropogenically modified biomes (‘Anthrome 12K’) dataset suggest first significant human impact. Finally, estimated extirpation for tigers have been extirpated. Results once occupied resident approximately 11.5 million km 2 , crossing 116 ecoregions. also mapped an additional c. 11.7 exploratory 1.2 possible range. Collectively these areas overlap 36 modern countries. Significant disruption seems begun 6000 years ago some areas, but other regions has yet materialise. In few arid ecoregions, activities appear modestly increased availability past, overall lost between 90% 95% their last 8500 years. Main Conclusions ‘indigenous range’ species, develop replicable biogeographical procedure, apply procedure discuss transferability species.

Language: Английский

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Quantitative pollen-based paleoclimate reconstructions for the past 18.5 ka in southwestern Yunnan Province, China

Global and Planetary Change, Journal Year: 2023, Volume and Issue: 230, P. 104288 - 104288

Published: Oct. 29, 2023

Language: Английский

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A novel approach for quantitatively distinguishing between anthropogenic and natural effects on paleovegetation

PNAS Nexus, Journal Year: 2024, Volume and Issue: 3(4)

Published: March 28, 2024

Abstract How to distinguish and quantify past human impacts on vegetation is a significant challenge in paleoecology. Here, we propose novel method, the error inflection point-discriminant technique. It finds out points (IPs) of regression errors pollen–climate transfer functions using modern pollen spectra from with different values Human Influence Index (HII), which represent HII threshold native/secondary secondary/artificial systems. Our results show that value at IPs approximately 22 globally uniform, whereas it varies regionally for IPs. In case study Liangzhu archaeological site lower Yangtze River, discriminant three types native were established reconstruct paleovegetation paleoclimate over 6,600 years. demonstrates this method's feasibility quantitatively distinguishing assessing quantitative reconstructions data.

Language: Английский

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Temperature variability revealed by lacustrine brGDGTs in northeastern China since the Last Glacial Maximum

Global and Planetary Change, Journal Year: 2024, Volume and Issue: 234, P. 104384 - 104384

Published: Feb. 10, 2024

Language: Английский

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