Sébastien Joannin
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View article: Holocene climate dynamics in the central Mediterranean inferred from pollen data
Holocene climate dynamics in the central Mediterranean inferred from pollen data Open
The Mediterranean climate is characterised by strong seasonality, which is critical for the ecosystems and societies in the region and makes them susceptible to climate change. The timing of when the Mediterranean climate developed over th…
View article: Boosted Regression Trees Machine Learning Method Improves the brGDGT‐Based Climate Reconstruction in Drylands
Boosted Regression Trees Machine Learning Method Improves the brGDGT‐Based Climate Reconstruction in Drylands Open
Branched glycerol dialkyl glycerol tetraethers (brGDGTs), bacterial membrane lipids, are widely used as temperature proxies. Although these proxies are effective for reconstructing past temperatures, brGDGT‐based methods encounter limitati…
View article: Vegetation and climate dynamics in the south-western mediterranean during MIS 37–31 (∼1.25 - ∼1. 06 Ma): Insights from the marine core ODP site 976
Vegetation and climate dynamics in the south-western mediterranean during MIS 37–31 (∼1.25 - ∼1. 06 Ma): Insights from the marine core ODP site 976 Open
International audience
View article: Supplementary material to "BrGDGT-based palaeothermometer in drylands: the necessity to constrain aridity and salinity as confounding factors to ensure the robustness of calibrations"
Supplementary material to "BrGDGT-based palaeothermometer in drylands: the necessity to constrain aridity and salinity as confounding factors to ensure the robustness of calibrations" Open
View article: BrGDGT-based palaeothermometer in drylands: the necessity to constrain aridity and salinity as confounding factors to ensure the robustness of calibrations
BrGDGT-based palaeothermometer in drylands: the necessity to constrain aridity and salinity as confounding factors to ensure the robustness of calibrations Open
Past temperature reconstructions offer valuable insights into the impact of climate change on the global climate-human-vegetation system. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are recognized as effective temperature prox…
View article: First paleoenvironmental calibrations for modern pollen rain of Tajikistan and Uzbekistan: A case study of pollen - vegetation functional biogeography of Arid Central Asia
First paleoenvironmental calibrations for modern pollen rain of Tajikistan and Uzbekistan: A case study of pollen - vegetation functional biogeography of Arid Central Asia Open
View article: Palaeoclimate synthesis of the central Mediterranean area from pollen data
Palaeoclimate synthesis of the central Mediterranean area from pollen data Open
Mediterranean climate is characterised by a strong seasonality, critical for the ecosystems and societies in the region and is susceptible to climate change. The timing of when the Mediterranean climate developed over the past few thousand…
View article: Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes
Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes Open
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) serve as critical molecular biomarkers for the quantitative reconstruction of past environments, ambient temperature and pH across various archives. Despite their success, numerous i…
View article: Supplementary material to "Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes"
Supplementary material to "Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes" Open
View article: Functional Signatures of Surface Pollen and Vegetation Are Broadly Similar: Good News for Past Reconstructions of Vegetation
Functional Signatures of Surface Pollen and Vegetation Are Broadly Similar: Good News for Past Reconstructions of Vegetation Open
Aim Pollen assemblages are widely used to infer paleoenvironment features, aiming at reconstructing both past climates and biomes. However, the functional link between environmental conditions and pollen assemblages is not straightforward …
View article: Multi‐proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)
Multi‐proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America) Open
Following deglaciation, lowland sites in eastern Canada that were covered by proglacial Lake Ojibway recorded direct afforestation with boreal mixedwood taxa, without an initial tundra phase, contrary to sites that were never covered by th…
View article: A user‐friendly method to get automated pollen analysis from environmental samples
A user‐friendly method to get automated pollen analysis from environmental samples Open
Summary Automated pollen analysis is not yet efficient on environmental samples containing many pollen taxa and debris, which are typical in most pollen‐based studies. Contrary to classification, detection remains overlooked although it is…
View article: The environmental and cultural background for the reoccupation of the Armenian Highlands after the Last Glacial Maximum: The contribution of Kalavan 6
The environmental and cultural background for the reoccupation of the Armenian Highlands after the Last Glacial Maximum: The contribution of Kalavan 6 Open
View article: Postglacial vegetation migration facilitated by outposts on proglacial lake islands in eastern North America
Postglacial vegetation migration facilitated by outposts on proglacial lake islands in eastern North America Open
Postglacial vegetation colonization that followed ice retreat and proglacial lakes drainage in north-eastern America occurred rapidly, more rapidly than expected based on the modern dispersal capacities of boreal mixedwood trees. Paleo-isl…
View article: Early afforestation on islands of proglacial Lake Ojibway as evidence of post-glacial migration outposts
Early afforestation on islands of proglacial Lake Ojibway as evidence of post-glacial migration outposts Open
At the end of the last glacial period in the northern hemisphere, meltwater from receding ice sheets accumulated into large proglacial lakes, potentially limiting postglacial afforestation. We explored whether former islands of proglacial …
View article: Temperature and fire controls on vegetation dynamics in Northern Ural (Russia) boreal forests during the Holocene based on brGDGT and pollen data
Temperature and fire controls on vegetation dynamics in Northern Ural (Russia) boreal forests during the Holocene based on brGDGT and pollen data Open
View article: Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy
Climate changes during the Late Glacial in southern Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy Open
The Late Glacial (14 700–11 700 cal BP) is a key climate period marked by rapid but contrasted changes in the Northern Hemisphere. Indeed, regional climate differences have been evidenced during the Late Glacial in Europe and the northern …
View article: Comment on cp-2022-54
Comment on cp-2022-54 Open
Abstract. The Lateglacial (14,700–11,700 cal BP) is a key climate period marked by rapid but contrasted changes in the Northern Hemisphere. Indeed, regional climate differences have been evidenced during the Lateglacial in…
View article: Climate changes during the Lateglacial in South Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy
Climate changes during the Lateglacial in South Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy Open
The Lateglacial (14,700–11,700 cal BP) is a key climate period marked by rapid but contrasted changes in the Northern Hemisphere. Indeed, regional climate differences have been evidenced during the Lateglacial in Europe and the Northern Me…
View article: First pollen record from the Late Holocene forest environment in the Lesser Caucasus
First pollen record from the Late Holocene forest environment in the Lesser Caucasus Open
View article: Holocene climate in Northern Urals (Komi Republic, Russia): a multi-proxy approach based on pollen and brGDGTs
Holocene climate in Northern Urals (Komi Republic, Russia): a multi-proxy approach based on pollen and brGDGTs Open
<p>The functioning of the boreal forests of Russia is still little documented and little understood. It is governed by complex mechanisms that link climate, vegetation and disturbances, such as fires or human impact.In this presentat…
View article: Islands of proglacial lake Ojibway acted as outposts favoring postglacial forest migration in northwestern Qu&#233;bec
Islands of proglacial lake Ojibway acted as outposts favoring postglacial forest migration in northwestern Québec Open
<p>At the beginning of the Holocene, the Laurentide Ice Sheet was progressively melting and liberating Canadian landscapes. Proglacial Lake Ojibway formed at the contact of the glacier and covered western Québec and eastern …
View article: Problems and Solutions: brGDGTs distributions and calibrations for semi-arid environments and application to the wetlands of the Southern Caucasus.
Problems and Solutions: brGDGTs distributions and calibrations for semi-arid environments and application to the wetlands of the Southern Caucasus. Open
<div>The arid and semi-arid mountainous environment of the Southern Caucasus lies between the Black and Caspian Sea with elevations from below sea level to over 5000 m asl and has annual temperatures from -6˚ to 16˚…
View article: Impact of climate changes on vegetation and human societies during the Holocene in the South Caucasus (Vanevan, Armenia): A multiproxy approach including pollen, NPPs and brGDGTs
Impact of climate changes on vegetation and human societies during the Holocene in the South Caucasus (Vanevan, Armenia): A multiproxy approach including pollen, NPPs and brGDGTs Open
View article: Formation and early diagenesis of cold and freshwater terrestrial carbonates (lake Sevan, Armenia)
Formation and early diagenesis of cold and freshwater terrestrial carbonates (lake Sevan, Armenia) Open
International audience
View article: Late Holocene Mongolian climate and environment reconstructions from brGDGTs, NPPs and pollen transfer functions for Lake Ayrag: Paleoclimate implications for Arid Central Asia
Late Holocene Mongolian climate and environment reconstructions from brGDGTs, NPPs and pollen transfer functions for Lake Ayrag: Paleoclimate implications for Arid Central Asia Open
View article: 1.36 million years of Mediterranean forest refugium dynamics in response to glacial–interglacial cycle strength
1.36 million years of Mediterranean forest refugium dynamics in response to glacial–interglacial cycle strength Open
Significance Forest conservation and restoration are important means to counter threats caused by habitat fragmentation and global change. Diverse and resilient forests can only be maintained if we understand their sensitivity to past clim…
View article: Holocene Fire Regime Changes in the Southern Lake Baikal Region Influenced by Climate-Vegetation-Anthropogenic Activity Interactions
Holocene Fire Regime Changes in the Southern Lake Baikal Region Influenced by Climate-Vegetation-Anthropogenic Activity Interactions Open
Catastrophic fire years that have taken place during the last decade in Siberia, and more generally within the boreal forest, have been directly linked to global warming and had strong repercussions on boreal ecosystems and human populatio…
View article: Climate reconstructions based on GDGT and pollen surface datasets from Mongolia and Baikal area: calibrations and applicability to extremely cold–dry environments over the Late Holocene
Climate reconstructions based on GDGT and pollen surface datasets from Mongolia and Baikal area: calibrations and applicability to extremely cold–dry environments over the Late Holocene Open
Our understanding of climate and vegetation changes throughout the Holocene is hampered by representativeness in sedimentary archives. Potential biases such as production and preservation of the markers are identified by comparing these pr…
View article: The human and climate drivers of Holocene grassland fires in the South Caucasus: A macro-charcoal, brGDGTs, and pollen reconstruction
The human and climate drivers of Holocene grassland fires in the South Caucasus: A macro-charcoal, brGDGTs, and pollen reconstruction Open
<p>The mountainous area of Armenia has been a steppe throughout the Holocene with a rich history of fire events throughout this period. Previous research has found that changes in fire are linked to shifts between&a…