Found 9876 publications. Showing page 278 of 396:
2018
2018
2018
In the project there were monitoring of mercury (Hg) in air at one station and sampling and analysis of Hg in precipitation at two stations as well as analysis of Hg in 14 fish from the Pasvik water course. The monitoring results for Hg in air in Karpdalen show background levels around 1,3 - 1,4 ng/m3. Enhanced concentrations of Hg correspond to enhanced concentrations of SO2 (episodes). It is therefore likely that there exist a small local source of Hg in the border areas co-located with the sources of SO2. Concentrations and deposition of Hg in precipitation are higher at Svanvik than in Karpdalen, but lower than background stations in Southern Norway. Analysis of Hg in fish meat show that the largest fish (pike, trout, perch) have concentrations higher than the threshold value of 0,5 mg/kg. White fish showed low values.
NILU
2018
2018
American Geophysical Union (AGU)
2018
2018
Recent Arctic ozone depletion: Is there an impact of climate change?
After the well-reported record loss of Arctic stratospheric ozone of up to 38% in the winter 2010–2011, further large depletion of 27% occurred in the winter 2015–2016. Record low winter polar vortex temperatures, below the threshold for ice polar stratospheric cloud (PSC) formation, persisted for one month in January 2016. This is the first observation of such an event and resulted in unprecedented dehydration/denitrification of the polar vortex. Although chemistry–climate models (CCMs) generally predict further cooling of the lower stratosphere with the increasing atmospheric concentrations of greenhouse gases (GHGs), significant differences are found between model results indicating relatively large uncertainties in the predictions. The link between stratospheric temperature and ozone loss is well understood and the observed relationship is well captured by chemical transport models (CTMs). However, the strong dynamical variability in the Arctic means that large ozone depletion events like those of 2010–2011 and 2015–2016 may still occur until the concentrations of ozone-depleting substances return to their 1960 values. It is thus likely that the stratospheric ozone recovery, currently anticipated for the mid-2030s, might be significantly delayed. Most important in order to predict the future evolution of Arctic ozone and to reduce the uncertainty of the timing for its recovery is to ensure continuation of high-quality ground-based and satellite ozone observations with special focus on monitoring the annual ozone loss during the Arctic winter.
Elsevier
2018
2018
2018
There is a concern that continued emissions of man-made per- and polyfluoroalkyl substances (PFASs) may cause environmental and human health effects. Now widespread in human populations and in the environment, several PFASs are also present in remote regions of the world, but the environmental transport and fate of PFASs are not well understood. Phasing out the manufacture of some types of PFASs started in 2000 and further regulatory and voluntary actions have followed. The objective of this review is to understand the effects of these actions on global scale PFAS concentrations.
2018
2018
2018
2018
American Meteorological Society
2018
CITI-SENSE Citizens' Observatories Architecture
This paper introduces the architecture of the CITI-SENSE Citizens’ Observatories based on the ISO 19119 reference model. It describes the various parts of the architecture including boundary services with sensors and apps and data management services with the CITI-SENSE data model. It also describes the Web Feature Service (WFS) storage support and the reusable visualisation widgets used for both apps and web portals in various Citizens’ Observatories.
European Commission Joint Research Centre
2018
Signals from the south; humpback whales carry messages of Antarctic sea‐ice ecosystem variability
John Wiley & Sons
2018