Les brusques périodes de réchauffement qui ont affecté le Saalien Supérieur entre 130 et 190 ka n'étaient certainement pas liées au bilan carbone des Néandertaliens
(pp. 31-32, 24/04/2026)
CReAAH, UM, UR, UR2, CNRS, UFR HHAA, UN, MC, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Chronostratigraphie et paléoenvironnements du Pléistocène supérieur sur la bordure sud-Atlantique du Maroc. Les séquences de l'oued supérieur.
(pp. 206-227, 24/04/2026)
UPVD, LAMPEA, AMU, CNRS, MC, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, GEOTRAC, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, OCEANIS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA
Acquisition of detrital magnetization in four turbidites
Turbiditic events are mostly avoided in paleomagnetic studies and therefore their remanence and magnetic properties are poorly described. Turbidites are exempt of bioturbation and potentially provide pertinent information about depositional remanence. We studied four quaternary turbidites of different origins in marine sediment cores. Upward fining of both magnetic and sedimentary fractions indicates that coarser grains reached the bottom first. We observe a progressive shallowing of the magnetic inclinations between the upper and bottom layers of the turbidites that increases with the size of the events and obeys a simple linear scaling law. Measurements of magnetic anisotropy suggest that hydrodynamic conditions prevailing during deposition seem to be dominant for the alignment of the magnetic grains. We suggest that small spherical grains are randomly oriented with zero resultant magnetization in presence of strong turbulent conditions, while the alignment of elongated grains is constrained by the competition between gravity and magnetic forces. A possible scenario is that under turbulent conditions they tend to rest at the bottom with their long axes parallel to the sediment surface and therefore with shallow inclinations, whereas weakly turbulent conditions like during the smallest (26 cm thick) event do not disturb the magnetic alignment and therefore do not generate inclination shallowing.
(Geochemistry, Geophysics, Geosystems. vol. 17, pp. 3207-3223, 24/04/2026)
IPGP - UMR_7154, INSU - CNRS, IGN, UR, IPG Paris, CNRS, UPCité, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, PALEOCEAN, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Groenland. Climat, Ecologie, Société
(pp. 300, 24/04/2026)
LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, LCE, CNRS, UFC, UBFC, CEFE, UPVM, INRA, Montpellier SupAgro, EPHE, PSL, UM, CNRS, IRD [Occitanie], Montpellier SupAgro, CEARC, UVSQ, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Paradoxical cold conditions during the medieval climate anomaly in the Western Arctic
In the Northern Hemisphere, most mountain glaciers experienced their largest extent in the last millennium during the Little Ice Age (1450 to 1850 CE, LIA), a period marked by colder hemispheric temperatures than the Medieval Climate Anomaly (950 to 1250 CE, MCA), a period which coincided with glacier retreat. Here, we present a new moraine chronology based on 36Cl surface exposure dating from Lyngmarksbræen glacier, West Greenland. Consistent with other glaciers in the western Arctic, Lyngmarksbræen glacier experienced several advances during the last millennium, the first one at the end of the MCA, in ~1200 CE, was of similar amplitude to two other advances during the LIA. In the absence of any significant changes in accumulation records from South Greenland ice cores, we attribute this expansion to multi-decadal summer cooling likely driven by volcanic and/or solar forcing, and associated regional sea-ice feedbacks. Such regional multi-decadal cold conditions at the end of the MCA are neither resolved in temperature reconstructions from other parts of the Northern Hemisphere, nor captured in last millennium climate simulations.
(Scientific Reports. vol. 6, n° 2045-2322, pp. 32984, 24/04/2026)
LGP, UP1, UPEC UP12, CNRS, OSUG, Grenoble INP, INSU - CNRS, IRSTEA, USMB [Université de Savoie] [Université de Chambéry], CNRS, UGA [2016-2019], LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, GLACCIOS, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CEREGE, IRD, INRA, AMU, CdF (institution), INSU - CNRS, CNRS, MMU
Unprecedented coring performance with the upgraded Research Vessel Marion Dufresne
(Past Global Changes Magazine. vol. 24, n° 2411-605X, pp. 27, 24/04/2026)
CLIMAG, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, CNRS, PALEOCEAN, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Potential exposure routes and accumulation kinetics for poly- and perfluorinated alkyl compounds for a freshwater amphipod: Gammarus spp. (Crustacea)
Gammarids were exposed to sediments from a deposition site located on the Rh^one River (France) downstream of a fluoropolymer manufacturing plant. Gammarids accumulated to various extents four long-chain perfluoroalkyl carboxylic acids (PFCAs) from C9 to C13, one sulfonate, perfluorooctane sulfonate (PFOS) and three of its precursors (the perflurooctane sulfonamide (FOSA), the N-methyl perfluorooctane sulfonamidoacetic acid (MeFOSAA), the N-ethyl perfluorooctane sulfonamidoacetic acid (EtFOSAA) and the 6:2 fluorotelomer sulfonic acid (6:2 FTSA). Whatever the compound, the steady state was not achieved after a 3-week exposure; elimination was almost complete after a 3-week depuration period for perfluorononanoic acid (PFNA), PFOS, the three precursors and the 6:2FTSA. However, this was not the case for long-chain PFCAs, whose elimination rates decreased with increasing chain length. PFAS accumulation in gammarids occurred via the trophic and respiratory pathways, in proportions varying with the carbon chain length and the terminal moiety.
(Chemosphere. vol. 155, n° 0045-6535, pp. 380-387, 24/04/2026)
UR MALY, IRSTEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Monitoring the state of the spawning ground for future return of Acipenser sturio in the Gironde
Cette présentation synthétise les résultats des effets des contaminants organiques et minéraux présents sur les frayères et évalue la tolérance oxy-thermique des embryons et jeunes larves
(pp. 29, 24/04/2026)
UR EABX, IRSTEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, INRA
Evaluation of spectral methods for high-frequency multiannual time series in coastal transitional waters: advantages of combined analyses: Tests of spectral analysis on coastal time series
High-frequency monitoring is currently a major component in the management and research of the coastal system responses to ongoing global changes. This monitoring is essential in tidal systems to address the multiscale variability of physico-chemical parameters. The analysis of the resulting multiscale, nonlinear, non-stationary and noisy time series requires adequate techniques; however, to date, there are no standardized methods. Spectral methods might be useful tools to reveal the main variability time scales, and thus their associated forcings. The most widely used methods in coastal systems are Lomb-Scargle Periodogram (LSP), Singular Spectral Analysis (SSA), Continuous Wavelet Transform (CWT), and Empirical Mode Decomposition (EMD), but their relevance for high-frequency, long-term records is still largely unexplored. In this article, these spectral methods are tested and compared using a high-frequency 10-yr turbidity dataset in the Gironde estuary. Advantages and limitations of each method are evaluated on the basis of five criteria: (1) efficiency for incomplete time series, (2) appropriateness for time-varying analysis, (3) ability to recognize processes without complementary environmental variables, (4) capacity to calculate the relative importance of forcings, and (5) capacity to identify long-term trends. SSA is the only analysis method to satisfy all the criteria, even with 70% missing data. Combining methods is also a promising strategy; i.e., SSA1LSP for better recognition of processes; CWT1SSA and EMD1CWT for short-term (seasonal) and long-term (>1 yr) analysis, respectively. The purpose of this methodological framework is to serve as a reference for future postprocessing of data from monitoring programs in coastal waters.
(Limnology and Oceanography: Methods. vol. 14, n° 1541-5856, pp. 381-396, 24/04/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
The expansion of Central and Northern European Neolithic populations was associated with a multi-century warm winter and wetter climate
It is still debated whether climate changes had an impact on the emergence, spread, and disappearance of early production-based (Neolithic) adaptations. To date, and despite the incorporation of various paleoclimatic proxies, there exists no spatial reconstruction of the regional impact of the North Atlantic cooling events on Central-Western European climate and environments during the early Holocene. In order to address these two issues, we estimated seasonal and annual temperature and precipitation from a marine pollen record from Trondheimsfjord (central Norway) along with 68 pollen records distributed across Central-Western Europe for the time period associated with the Linearbandkeramik (LBK) cultural tradition, 7600-6900 yr cal. BP. Two distinct vegetation-derived rapid, <100 years, climate changes, contemporaneous with reduced warm Atlantic water (AW) inflow and winter storminess in the northern North Atlantic, bracket the expansion of the LBK. The geographic expansion of LBK populations appears to coincide with winter warming by ca. 2.5 degrees C on average, and an increase in summer and winter precipitation, while its decline is associated with decreases in winter temperature, by similar to 1.5 degrees C on average, and summer rainfall. Our results confirm that LBK subsistence practices were well-adapted to wet and relatively warm winters and cool summers, which are favorable to some cultigens, such as einkorn. This is in contrast to the hypothesis that cooler and wetter climatic conditions would induce increased instability of agricultural communities leading to the decline of LBK populations.
(The Holocene. vol. 26, n° 0959-6836, pp. 1188--1199, 24/04/2026)
EPHE, PSL, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, PACEA, UB, CNRS, CReAAH, UM, UR, UR2, CNRS, UFR HHAA, UN, MC, MCC