Found 10488 publications. Showing page 1 of 420:
2026
Assessment of the extremely low TOC at three European stations during February 2023
Exceptionally low total ozone column (TOC) values were observed over Europe in February 2023, affecting both Arctic and mid-latitude regions. This study investigates the evolution and underlying mechanisms of this low-ozone episode by integrating ground-based observations, satellite measurements, and atmospheric reanalysis data. Daily TOC data from Andøya, Oslo/Kjeller, and Hradec Králové are complemented by multi-sensor reanalysis products and vertically resolved measurements from the Microwave Limb Sounder (MLS). The lowest TOC values occurred on 14 February 2023, when all three stations recorded anomalies below the 2σ climatological threshold. This period coincided with a cold stratospheric polar vortex, which promoted the formation of polar stratospheric clouds and subsequent chemical ozone loss. MLS observations reveal pronounced decreases in HNO3 and HCl, accompanied by enhanced ClO concentrations, indicating active halogen-driven ozone loss. The strongest chemical ozone depletion was observed over Scandinavia and later extended toward Central Europe. In addition to chemical processes, dynamical factors significantly contributed to the observed TOC reduction. Elevated tropopause heights and the transport of ozone-poor air from lower latitudes further reduced TOC, particularly over Central Europe. The results demonstrate that the February 2023 low-ozone event arose from the combined effects of chemical ozone loss within cold polar vortex air and large-scale dynamical processes, emphasizing the importance of integrated chemical–dynamical analyses for understanding extreme Arctic ozone events.
2026
2026
Assessing Earth system responses arising from carbon dioxide removal (CDR) requires developing and simulating pairs of scenarios – a mitigation scenario with deployment of CDR and a corresponding no-CDR baseline. The latter describes a world where no CDR is deployed, such that net carbon emissions are higher and a given temperature target may be missed. While over the past years a rich literature on mitigation scenarios with CDR has been emerging, no-CDR baselines have mostly been explored in stylized Earth system model (ESM) experiments. In such simulations, a no-CDR baseline simply assumes that CDR is “switched off”, while socio-economic constraints are not considered. However, the deployment of CDR in mitigation scenarios, created by integrated assessment models (IAMs), is embedded in a consistent socio-economic description of plausible futures, and disallowing CDR may affect climate drivers due to changes in the energy system and in land-use dynamics. Particularly, when moving towards an activity-driven representation of CDR in emission-driven ESMs, where the activity that draws down CO2 from the atmosphere is explicitly modelled, the creation of no-CDR baselines comes with challenges and trade-offs. Here, we conceptualize a framework for emission-driven ESM simulations of IAM scenarios that allows us to determine carbon-cycle feedbacks and biogeophysical effects of CDR deployment using no-CDR baselines. We show that different options exist for the creation of no-CDR baselines, which offer different insights and have their specific advantages and limitations. We also demonstrate that internal variability of the climate system inherently limits our ability to detect the small signals related to CDR deployment and its feedbacks. Hence, unless a sufficiently large initial conditions ensemble is employed, stylized modelling approaches may remain preferable for some applications, e.g., the quantification of regional biogeophysical effects of CDR deployment. Both, the efficiency of CDR (defined as CO2 removed per unit of resources employed) as well as related carbon-cycle feedbacks and biogeophysical effects are expected to be scenario- and model-dependent. Our simulation design of concentration- and emission-driven no-CDR baselines, together with an improved representation of CDR in the IAM – ESM modelling chain, opens an avenue towards estimating CDR efficiencies and their uncertainties under various future scenarios in upcoming model intercomparison activities.
2026
Kvinnelige forskere får tilsendt sexmeldinger og penisbilder
Siden Hilde Gunn Slottemo ble nestleder i Forskerforbundet, har innboksen vært fylt med flørtende og seksualiserte meldinger fra fremmede menn. Hun er langt fra den eneste forskeren som opplever uønsket oppmerksomhet.
2026
2026
2026
Start-up asked for regulation changes to allow controversial marine carbon storage | RNZ
An international start-up has been pushing for regulation changes to allow it to carry out controversial marine carbon storage in New Zealand waters.
2026
Marine carbon dioxide removal is a big idea - with big hurdles | RNZ
Explainer - A start-up company wants to carry out marine carbon dioxide removal in New Zealand waters. What is mCDR and why is it controversial?
2026
Datasenter, Klimagassutslipp | Datasenter i Fyresdal vil bruke like mye diesel som 1600 biler
Datasenter vil bruke like mye diesel som 1600 biler.
2026
2026
Airborne microplastics and nanoplastics (MNPs) are emerging contaminants of global concern due to their persistence, widespread distribution, and potential health impacts. With sizes comparable to PM2.5, they are inhalable and may penetrate deep into the respiratory tract. Their detection and quantification remain challenging because of low environmental concentrations, complex matrices, and particle sizes often below the detection limits of current micro spectroscopic techniques. Pyrolysis–gas chromatography–mass spectrometry (Py-GC-MS) offers a powerful mass-based approach, enabling identification and quantification of polymers regardless of particle size. This review critically examines current methodologies for airborne MNP analysis using Py-GC-MS, including sampling strategies, pretreatment protocols, instrumental parameters, and data modeling approaches. A technological readiness level assessment highlights limited methodological harmonization and insufficient validation, particularly for nanoplastics. Progress toward routine atmospheric monitoring requires standardized workflows, agreed polymer-specific markers, interlaboratory validation, and improved reporting practices to establish Py-GC-MS as a cornerstone technique for airborne MNP assessment.
2026
2026
2026
Monitoring of environmental contaminants in freshwater food webs (MILFERSK), 2025
This report presents data from the fifth year of a five-year period for the MILFERSK program. In 2025, the monitoring program focused on the sampling and analysis of the pelagic food chain in Lake Mjøsa, encompassing the following sample types: zooplankton mainly epipelagic species, Mysis, vendace, E. smelt, and brown trout. Additionally, brown trout from the reference lake, Femunden, were collected. The concentrations of 228 individual compounds/isomers were determined, with frequent detections of specific per- and polyfluoroalkyl substances (PFAS), polybrominated diphenyl ethers (PBDEs), mercury (Hg), and siloxanes exhibiting biomagnifying properties throughout the food chain. Time series of these
contaminant groups show declining concentrations in brown trout in Lake Mjøsa. We also observe lower concentrations in the pelagic biota for phthalates and UVcompounds, compared to in 2023 when last pelagic biota was included in the program. Out of the 14 car tyre compounds included in the analysis of pelagic biota in 2025, only DPG and 6PPD Q were detected at low levels in zooplankton and Mysis.
Norsk institutt for vannforskning (NIVA)
2026
Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2025
This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya and Ny-Ålesund. The UV measurements started in 1995. The results show that there was a significant decrease in stratospheric ozone above Norway between 1979 and 1997. After that, the ozone layer stabilized at a level ~2% below pre-1980 level. The year 2025 was characterized by low total ozone values most of the year, especially at Kjeller and Andøya, which contributed to high annual UV doses at these stations
NILU
2026
Data Report 2024. Particulate matter, carbonaceous and inorganic compounds
This report presents an overview of annual statistical summaries and methods for sampling and analysis of particulate matter, carbonaceous and inorganic compounds measured under the EMEP monitoring programme in 2024.
NILU
2026
Transboundary pollution by heavy metals and POPs
Meteorological Synthesizing Centre – East (MSC-E)
2026