LegacyClimate 1.0: A dataset of pollen-based climate reconstructions from 2594 Northern Hemisphere sites covering the late Quaternary

Herzschuh, Ulrike; Böhmer, Thomas; Li, Chenzhi; Chevalier, Manuel; Dallmeyer, Anne; Cao, Xianyong; Bigelow, Nancy H.; Nazarova, Larisa; Novenko, Elena; Park, Jungjae; Peyron, Odile; Rudaya, Natalia; Schlütz, Frank; Shumilovskikh, Lyudmila; Tarasov, Pavel E.; Wang, Yongbo; Wen, Rong; Xu, Qinghai; Zheng, Zhuo

doi:10.5194/essd-2022-38

Cited by 14 publications

(38 citation statements)

References 24 publications

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“…The significance test statistics are on average better than in the Northern Hemisphere reconstructions by Herzschuh et al (2022a), which include North America, Europe, and Asia. It should be noted that this might be in parts due to including a larger signal from the glacial-interglacial transition in the records used here, whereas the Northern Hemisphere dataset is also containing records covering only the Holocene.…”

Section: Reconstruction Uncertainties and Transfer Function Performancementioning

confidence: 66%

“…The modern pollen samples are selected from a Northern Hemisphere calibration dataset comprised of 15,379 samples, which includes previous compilations for Eurasia and North America (Herzschuh et al, 2022a). The taxonomy of these samples is harmonized following the same strategy as for the fossil pollen data.…”

Section: Modern Pollen and Climate Datamentioning

confidence: 99%

“…1 and the radius for each record is given in Online Resource 1. For more information on the modern dataset see Herzschuh et al (2022a).…”

Section: Modern Pollen and Climate Datamentioning

confidence: 99%

“…Local reconstructions from each pollen sequence are inferred with WAPLS transfer functions following the methodology from Herzschuh et al (2022a). WAPLS is a regression-based statistical transfer function that consists of two stages (Birks et al, 2010).…”

Section: Statistical Transfer Functionsmentioning

confidence: 99%

“…This number provides a compromise between using the information from the occurring biodiversity and having sufficient coverage in the modern training data to identify the bioclimatic niches of the individual taxa. For more details, see Herzschuh et al (2022a).…”

Section: Introductionmentioning

confidence: 99%

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A state estimate of Siberian summer temperature and moisture availability during the Last Glacial Maximum combining pollen records and climate simulations

Weitzel¹,

Hense²,

Herzschuh³

et al. 2022

Preprint

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The Last Glacial Maximum (LGM, ~21.000 years before present) was a period with significantly lower global mean temperature, large Northern Hemisphere ice sheets, and low CO2 concentrations. Unlike other high-latitude areas, Siberia was not covered by a terrestrial ice sheet. Climate simulations with LGM boundary conditions show large inter-model differences especially in Northern Siberia, which impede a direct analysis of Siberian LGM climate from simulations. Thus, constraints from proxy data are needed. Here, we reconstruct summer temperature and moisture availability from a network of Siberian pollen records using statistical transfer functions. The estimates are corrected for the lower CO2 concentrations during the LGM with an a posteriori method.Using a Bayesian framework, we combine the pollen-based reconstructions with climate simulations to obtain the first regional state estimate of LGM climate constrained by proxies from Central and Eastern Siberia. Our reconstruction shows higher summer temperature anomalies than most high-latitude areas and simulations. Reconstructed moisture availability is similar to present-day values, consistent with most simulations. Analyses of the simulations show that anomalous circulation patterns and reduced cloud cover contribute particularly to the relatively high summer temperatures, supporting previous studies based solely on climate simulations. Our data-constrained state estimate is well-suited for future analyses of Siberian LGM climate such as investigations of the reasons for the absence of a Siberian ice sheet during the LGM.

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Section: Reconstruction Uncertainties and Transfer Function Performancementioning

confidence: 66%

Section: Modern Pollen and Climate Datamentioning

confidence: 99%

“…1 and the radius for each record is given in Online Resource 1. For more information on the modern dataset see Herzschuh et al (2022a).…”

Section: Modern Pollen and Climate Datamentioning

confidence: 99%

Section: Statistical Transfer Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A state estimate of Siberian summer temperature and moisture availability during the Last Glacial Maximum combining pollen records and climate simulations

Weitzel¹,

Hense²,

Herzschuh³

et al. 2022

Preprint

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Reversals in Temperature‐Precipitation Correlations in the Northern Hemisphere Extratropics During the Holocene

Herzschuh

Böhmer

et al. 2022

Geophysical Research Letters

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We analysed Holocene temperature-precipitation correlations and hydrological sensitivities using climate proxy (pollen) and model data from Northern Hemisphere extratropics.• We found reversals to negative temperature-precipitation correlations from the cold early Holocene to the warm mid-Holocene likely related to moisture-limited convection.• Correlations and hydrological sensitivities were mostly stable positive in polar and extratropical monsoon-areas.

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Global Synthesis of Regional Holocene Hydroclimate Variability Using Proxy and Model Data

Hancock

McKay

Erb

et al. 2023

Paleoceanog and Paleoclimatol

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Substantial changes in terrestrial hydroclimate during the Holocene are recorded in geological archives and simulated by computer models. To identify spatial and temporal patterns during the past 12 ka, proxy records sensitive to changing precipitation and effective moisture (precipitation minus evaporation) were compiled from across the globe (n = 813). Proxy composite timeseries were computed for 30 of the IPCC AR6 regions and compared to two full‐Holocene transient model simulations (TraCE‐21ka and HadCM3) and twelve mid‐Holocene CMIP6 simulations. We find that throughout Northern Hemisphere monsoon regions, proxy and model simulations indicate wetter‐than‐modern conditions during the early and mid‐Holocene while Southern Hemisphere monsoon regions were drier. This insolation driven trend toward modern values began approximately 6,000 years ago, and the clear agreement among proxy records and models may reflect the large magnitude of precipitation change and consistent atmospheric circulation forcing mechanism for these regions. In the midlatitudes, the pattern of change is less certain. Generally, proxy composites show a wetting trend throughout the Holocene for the northern midlatitudes, possibly due to strengthening westerlies from an increasing latitudinal temperature gradient. However, simulations indicate that the magnitude of change was relatively low, and for portions of North America, there is a proxy‐model disagreement. At high latitudes, hydroclimate is positively correlated with temperature in both proxies and models, consistent with projected wetting as temperatures rise. Overall, this large proxy database reveals a coherent pattern of hydroclimate variability despite the challenges associated with reconstructing hydroclimate fields.

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LegacyClimate 1.0: A dataset of pollen-based climate reconstructions from 2594 Northern Hemisphere sites covering the late Quaternary

Cited by 14 publications

References 24 publications

A state estimate of Siberian summer temperature and moisture availability during the Last Glacial Maximum combining pollen records and climate simulations

A state estimate of Siberian summer temperature and moisture availability during the Last Glacial Maximum combining pollen records and climate simulations

Reversals in Temperature‐Precipitation Correlations in the Northern Hemisphere Extratropics During the Holocene

Global Synthesis of Regional Holocene Hydroclimate Variability Using Proxy and Model Data

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