Mission Baelo Claudia. Rapport d'activités
(19/10/2026)
LIENSs, INSU - CNRS, ULR, CNRS, HALMA, CNRS, MC, IRAA, UL2, AMU, CNRS, HeRMA [Poitiers], UP, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
First record of the invasive species Ianiropsis serricaudis Gurjanova, 1936 (Crustacea: Isopoda) in Arcachon Bay, Bay of Biscay (NE Atlantic)
The invasive isopod Ianiropsis serricaudis Gurjanova, 1936, originally described from the North-West Pacific Ocean, is herein reported for the first time on the French Atlantic coast. Its presence is probably due to oyster import activity, and the sampling of many brooding females in Arcachon Bay since 2013 suggests a well-established species. Its current European distribution is summarised and some morphological characters are discussed.
(BioInvasions Records. vol. 7, n° 2242-1300, pp. 171-176, 19/10/2026)
EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Steps to improve gender diversity in coastal geoscience and engineering
Robust data are the base of effective gender diversity policy. Evidence shows that gender inequality is still pervasive in science, technology, engineering and mathematics (STEM). Coastal geoscience and engineering (CGE) encompasses professionals working on coastal processes, integrating expertise across physics, geomorphology, engineering, planning and management. The article presents novel results of gender inequality and experiences of gender bias in CGE, and proposes practical steps to address it. It analyses the gender representation in 9 societies, 25 journals, and 10 conferences in CGE and establishes that women represent 30% of the international CGE community, yet there is under-representation in prestige roles such as journal editorial board members (15% women) and conference organisers (18% women). The data show that female underrepresentation is less prominent when the path to prestige roles is clearly outlined and candidates can self-nominate or volunteer instead of the traditional invitation-only pathway. By analysing the views of 314 survey respondents (34% male, 65% female, and 1% ‘‘other’’), we show that 81% perceive the lack of female role models as a key hurdle for gender equity, and a significantly larger proportion of females (47%) felt held back in their careers due to their gender in comparison with males (9%). The lack of women in prestige roles and senior positions contributes to 81% of survey respondents perceiving the lack of female role models in CGE as a key hurdle for gender equality. While it is clear that having more women as role models is important, this is not enough to effect change. Here seven practical steps towards achieving gender equity in CGE are presented: (1) Advocate for more women in prestige roles; (2) Promote high-achieving females; (3) Create awareness of gender bias; (4) Speak up; (5) Get better support for return to work; (6) Redefine success; and, (7) Encourage more women to enter the discipline at a young age. Some of these steps can be successfully implemented immediately (steps 1–4), while others need institutional engagement and represent major societal overhauls. In any case, these seven practical steps require actions that can start immediately.
(Humanities and Social Sciences Communications. vol. 4, 19/10/2026)
UoN, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS
Late Holocene record from a Loire River incised paleovalley (French inner continental shelf): insights into regional and global forcing factors
(19/10/2026)
LPG-ANGERS, LPG, UA, UN UFR ST, UN, INSU - CNRS, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, SHOM
Retrospective analysis of the ecological changes in the Laurentian ecosystem using sclerochronology
(19/10/2026)
MSSMat, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LEMAR, IRD, IFREMER, UBO EPE, CNRS, UFR Santé [Poitiers], UP
Dispersive and dispersive-like bores in channels with sloping banks
In this paper, a detailed analysis of undular bore dynamics in channels of variable cross-section is presented. Two undular bore regimes, Low Froude Number (LFN) and High Froude Number (HFN), are simulated with a Serre-Green-Naghdi model, and the results are compared with the experiments by Treske. We show that contrary to Favre waves and HFN bores, which are controlled by dispersive non-hydrostatic mechanisms, LFN bores correspond to a hydrostatic phenomenon. The dispersive-like properties of the LFN bores is related to wave refraction on the banks in a way similar to that of edge waves in the nearshore. A fully hydrostatic theoretical model allowing to describe these dispersive-like bores is derived and compared to the observations, confirming our claim.
(19/10/2026)
IRSTEA, UGA [2016-2019], EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CARDAMOM, IMB, UB, Bordeaux INP, CNRS, Inria
Les effets de la crue de juin 2016 sur la qualité de l'eau du bassin de la Seine
Page de couverture Le PIREN-Seine est un programme de recherche interdisciplinaire en environnement dont l'objectif est de développer une vision d'ensemble du fonctionnement du bassin versant de la Seine et de la société humaine qui l'investit, pour permettre une meilleure gestion qualitative et quantitative de la ressource en eau. Il est l’un des programmes composant la Zone Atelier Seine du CNRS. La cellule transfert des connaissances a pour but de valoriser les productions de savoirs scientifiques issues des recherches du PIREN-Seine, et de favoriser la mise à disposition de ces informations à un large public, des professionnels de la gestion de l’eau aux élus en passant par les usagers. Soutenue par l'Agence de l'eau Seine-Normandie et l'EPTB Seine Grands Lacs, et animée depuis octobre 2016 par l'association ARCEAU-IdF, cette cellule répond à une forte volonté de la part des chercheurs de participer au transfert des savoirs scientifiques et techniques vers la société civile. Elle est ainsi chargée de la rédaction et de l’édition de documents thématiques, de la mise en ligne de contenus scientifiques adaptés à la fois aux professionnels et au grand public, et de la mise en place d’ateliers de co-réflexion du programme. La collection des fascicules du PIREN-Seine analyse différents aspects du fonctionnement du bassin de la Seine, correspondant aux multiples domaines de recherche du programme. Ils s’adressent à tous les publics concernés par l’analyse et la gestion du bassin versant de la Seine et des problématiques environnementales et humaines qui y sont liées. Tous ces fascicules sont disponibles en téléchargement gratuit au format PDF sur le site du programme. Une première série de neuf fascicules a été publiée en 2009. En 2011, six nouveaux titres sont venus enrichir la collection. En 2017, la production des fascicules reprend avec une nouvelle collection, pour permettre aux acteurs du domaine de l’eau et de l’environnement de rester informés des dernières recherches scientifiques menées par le PIREN-Seine.
(pp. 70 p., 19/10/2026)
GEOSCIENCES, PSL, METIS, EPHE, PSL, INSU - CNRS, SU, CNRS, GIP-Seine-Aval, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, LEESU, ENPC, UPEC UP12, GEDI, LSCE, UVSQ, INSU - CNRS, CNRS, DRF (CEA), CEA, LISIS, CNRS, INRAE
Equilibrium modeling of the beach profile on a macrotidal embayed low tide terrace beach
Eleven-year long time series of monthly beach profile surveys and hourly incident wave conditions are analyzed for a macrotidal Low Tide Terrace beach. The lower intertidal zone of the beach has a pluriannual cycle, whereas the upper beach profile has a predominantly seasonal cycle. An equilibrium model is applied to study the variation of the contour elevation positions in the intertidal zone as a function of the wave energy, wave power, and water level. When forcing the model with wave energy, the predictive ability of the equilibrium model is around 60% in the upper intertidal zone but decreases to 40% in the lower intertidal zone. Using wave power increases the predictive ability up to 70% in both the upper and lower intertidal zones. However, changes around the inflection point are not well predicted. The equilibrium model is then extended to take into account the effects of the tide level. The initial results do not show an increase in the predictive capacity of the model, but do allow the model free parameters to represent more accurately the values expected in a macrotidal environment. This allows comparing the empirical model calibration in different tidal environment. The interpretation of the model free parameter variation across the intertidal zone highlights the behavior of the different zones along the intertidal beach profile. This contributes to a global interpretation of the four model parameters for beaches with different tidal ranges, and therefore to a global model applicable at a wide variety sites.
(Ocean Dynamics. vol. 68, n° 1616-7341, pp. 1207-1220, 19/10/2026)
LGO, UBS, IFREMER, UBO EPE, CNRS, LHSV, ENPC, EDF R&D, EDF [E.D.F.], Cerema Equipe-projet HA, Cerema, Cerema Equipe-projet HA, Cerema, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, UBO EPE, LETG - Brest, LETG, UNICAEN, NU, UA, EPHE, PSL, UBO EPE, UR2, CNRS, IGARUN, UN
Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia
Deltaic and shallow marine sediments represent unique natural archives to study the evolution of surface coastal ocean water properties as compared to environmental changes in adjacent continents. Sea surface temperatures (SSTs) and higher plant biomarker records were generated from the Rhone and Var River deltaic sediments (NW Mediterranean Sea), and three sites in the South Adriatic Sea (Central/Eastern Mediterranean Sea), spanning all or part of the past three millennia. Because of the high sediment accumulation rates at all core sites, we were able to produce time series at decadal time scale. SSTs in the Gulf of Lion and the convection area of the South Adriatic Sea indicate similar cold mean values (around 17 °C) and pronounced cold spells, reflecting strong wind‐driven surface water heat loss. However, they differ in the rate of postindustrial warming, which is steeper in the Gulf of Lion. The three Adriatic Sea SST records are notably different reflecting different hydrological influence from nearshore to open sea sites. The compositional features of higher plant n‐alkanes in the Rhone and Var delta sediments and inferred vegetation types show differences consistent with the latitudinal extension of the drainage basins of both river streams. In the Adriatic Sea, both coastal and open sea sediments indicate enhanced land‐derived material over the past 500 years, which is not seen in the NW Mediterranean record. We suggest that increased erosion as the result of changes in land use practices is the most likely cause for this trend.
(Paleoceanography and Paleoclimatology. vol. 33, n° 2572-4525, pp. 579-593, 19/10/2026)
LOCEAN-VOG, LOCEAN, MNHN, IRD, INSU - CNRS, SU, CNRS, IPSL (FR_636), ENS-PSL, UVSQ, CEA, INSU - CNRS, X, CNES, SU, CNRS, UPCité, BTP, LOCEAN, IPSL, ENS-PSL, UVSQ, UPMC, CEA, INSU - CNRS, X, CNES, CNRS, MNHN, IRD, UPMC, INSU - CNRS, CNRS, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, CNR, CEFREM, UPVD, INSU - CNRS, CNRS, GM, IFREMER, DiSTAR, UNINA, LOCEAN-CYBIOM, LOCEAN, MNHN, IRD, INSU - CNRS, SU, CNRS, IPSL (FR_636), ENS-PSL, UVSQ, CEA, INSU - CNRS, X, CNES, SU, CNRS, UPCité
Modulation of the vertical particle transfer efficiency in the oxygen minimum zone off Peru
The fate of the organic matter (OM) produced by marine life controls the major biogeochemical cycles of the Earth's system. The OM produced through photosynthe-sis is either preserved, exported towards sediments or degraded through remineralisation in the water column. The productive eastern boundary upwelling systems (EBUSs) associated with oxygen minimum zones (OMZs) would be expected to foster OM preservation due to low O 2 conditions. But their intense and diverse microbial activity should enhance OM degradation. To investigate this contradiction, sediment traps were deployed near the oxycline and in the OMZ core on an instrumented moored line off Peru. Data provided high-temporal-resolution O 2 series charac-terising two seasonal steady states at the upper trap: sub-oxic ([O 2 ] < 25 µmol kg −1) and hypoxic-oxic (15 < [O 2 ] < 160 µmol kg −1) in austral summer and winter-spring, respectively. The OMZ vertical transfer efficiency of particulate organic carbon (POC) between traps (T eff) can be classi-Published by Copernicus Publications on behalf of the European Geosciences Union. 5094 M. Bretagnon et al.: Modulation of the vertical particle transfer efficiency fied into three main ranges (high, intermediate, low). These different T eff ranges suggest that both predominant preservation (high T eff > 50 %) and remineralisation (intermediate T eff 20 < 50 % or low T eff < 6 %) configurations can occur. An efficient OMZ vertical transfer (T eff > 50 %) has been reported in summer and winter associated with extreme limitation in O 2 concentrations or OM quantity for OM degradation. However, higher levels of O 2 or OM, or less refractory OM, at the oxycline, even in a co-limitation context, can decrease the OMZ transfer efficiency to below 50 %. This is especially true in summer during intraseasonal wind-driven oxygenation events. In late winter and early spring, high oxy-genation conditions together with high fluxes of sinking particles trigger a shutdown of the OMZ transfer (T eff < 6 %). Transfer efficiency of chemical elements composing the majority of the flux (nitrogen, phosphorus, silica, calcium car-bonate) follows the same trend as for carbon, with the lowest transfer level being in late winter and early spring. Regarding particulate isotopes, vertical transfer of δ 15 N suggests a complex pattern of 15 N impoverishment or enrichment according to T eff modulation. This sensitivity of OM to O 2 fluctuations and particle concentration calls for further investigation into OM and O 2-driven remineralisation processes. This should include consideration of the intermittent behaviour of OMZ towards OM demonstrated in past studies and climate projections .
(Biogeosciences. vol. 15, n° 1726-4170, pp. 5093-5111, 19/10/2026)
LEGOS, IRD, UT3, Comue de Toulouse, INSU - CNRS, CNES, CNRS, LOV, INSU - CNRS, SU, CNRS, IMEV, INSU - CNRS, SU, CNRS, IMARPE, MIO, IRD, AMU, INSU - CNRS, UTLN, CNRS, CAU, UABC, CICESE, IGP, EPOC, EPHE, PSL, UB, INSU - CNRS, CNRS, IMARPE, IMAGO, INSU - CNRS, LOPS, IRD, IFREMER, INSU - CNRS, UBO EPE, CNRS