Fant 9759 publikasjoner. Viser side 83 av 391:
SHIPMATE - Ship traffic particulate matter emissions. Final project report. NILU report
I SHIPMATE-prosjektet er det gjennomført målinger av en rekke forurensningskomponenter og aerosoler på Mt. Zeppelin observatoriet i løpet av 2014 og 2015. Målet for prosjektet var 1) å kartlegge hvor mye skipstrafikken bidrar til de observerte svevestøv-nivåene og 2) identifisere tidsrom i eksisterende tidsserier som i betydelig grad er påvirket av lokale utslipp fra skipstrafikken. Det siste er viktig for at tidsserien skal kunne benyttes for å studere regionale trender for ulike forurensningskomponenter i atmosfæren. Basert på en vurdering av gunstig vindretning mot målestasjonen med samtidige skipsanløp til Ny-Ålesund, er det identifisert alt åtte 3-dagers episoder hvor utslipp fra skipsfart påvirker datagrunnlaget. I disse episodene bidro utslipp fra skipstrafikken med ca. 50% av konsentrasjoner av følgende tungmetaller: Cu, Ni, Zn og Cd. Disse resultatene understøttes av en berikelsesfaktoranalyse av prøvene. Forekomst av episoder hvor skipstrafikk påvirker målingene ved målestasjonen på Mt. Zeppelin forekommer derimot sjeldent.
2016
Per- and polyfluoroalkyl substances (PFAS) have gained significant global attention due to their extensive industrial use and harmful effects on various organisms. Among these, perfluoroalkyl acids (PFAAs) are well-studied, but their diverse precursors remain challenging to monitor. The Total Oxidizable Precursor (TOP) assay offers a powerful approach to converting these precursors into detectable PFAAs. In this study, the TOP assay was applied to samples from the East Asian-Australian Flyway, a critical migratory route for millions of shorebirds. Samples included shellfish from China's coastal mudflats, key stopover sites for these birds, and blood and liver samples from shorebirds overwintering in Australia. The results showed a substantial increase in perfluorocarboxylic acids (PFCAs) across all sample types following the TOP assay, with the most significant increases in shorebird livers (Sum PFCAs increased by 18,156 %). Intriguingly, the assay also revealed unexpected increases in perfluorosulfonic acids (PFSAs), suggesting the presence of unidentified precursors. These findings highlight the need for further research into these unknown precursors, their sources, and their ecological impacts on shorebirds, other wildlife, and potential human exposure. This study also provides crucial insights into the TOP assay’s strengths and limitations in studying PFAS precursor dynamics in biological matrices.
Elsevier
2025
Sheath formation time for spherical Langmuir probes
The formation time of the surrounding sheath of Langmuir probes in an ionospheric plasma has been studied to better understand the constraints this puts on the sampling frequency of a probe. A fully kinetic three-dimensional particle-in-cell model is used to simulate the temporal effects in the electron saturation region as the sheath forms. The stability of the probe current and the stability of the ion and electron density in the vicinity of the probe have been used to evaluate when the sheath was formed. Simulated results were compared with theoretical models and are in good agreement with the theoretical results. This shows that theoretical models can be used as guidance to estimate the formation time and to determine the sampling rate for a swept bias Langmuir system. Our results also show that the formation time is less affected by the plasma temperature and bias voltage as we move into the thick sheath regime, and will instead be determined by the plasma density. The presented results also show that applying a step function to the probe could be used to characterise ions species composition, or to estimate the ion density.
Cambridge University Press
2023
SF6 as a greenhouse gas: An assessment of Norwegian global sources and the global warming potential. NILU OR
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2009
SESS report 2018. The State of Environmental Science in Svalbard – an annual report.
Svalbard Integrated Arctic Earth Observing System (SIOS)
2019
Separation of volcanic ash and sulfur dioxide from the Eyjafjallajökull eruption, April-May 2010. NILU F
2010
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Sensitivity analysis of ammonia emission reductions on exceedances of PM air quality standards. ETC/ACM Technical Paper, 2013/12
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2017
Low-cost air quality sensor systems can be deployed at high density, making them a significant candidate of complementary tools for improved air quality assessment. However, they still suffer from poor or unknown data quality. In this paper, we report on a unique dataset including the raw sensor data of quality-controlled sensor networks along with co-located reference data sets. Sensor data are collected using the AirSensEUR sensor system, including sensors to monitor NO, NO2, O3, CO, PM2.5, PM10, PM1, CO2 and meteorological parameters. In total, 85 sensor systems were deployed throughout a year in three European cities (Antwerp, Oslo and Zagreb), resulting in a dataset comprising different meteorological and ambient conditions. The main data collection included two co-location campaigns in different seasons at an Air Quality Monitoring Station (AQMS) in each city and a deployment at various locations in each city (also including locations at other AQMSs). The dataset consists of data files with sensor and reference data, and metadata files with description of locations, deployment dates and description of sensors and reference instruments.
Springer Nature
2023