Fant 9759 publikasjoner. Viser side 81 av 391:
2014
2012
Contribution of fluorescent primary biological aerosol particles to low-level Arctic cloud residuals
Mixed-phase clouds (MPCs) are key players in the Arctic climate system due to their role in modulating solar and terrestrial radiation. Such radiative interactions rely, among other factors, on the ice content of MPCs, which is regulated by the availability of ice-nucleating particles (INPs). While it appears that INPs are associated with the presence of primary biological aerosol particles (PBAPs) in the Arctic, the nuances of the processes and patterns of INPs and their association with clouds and moisture sources have not been resolved. Here, we investigated for a full year the abundance of and variability in fluorescent PBAPs (fPBAPs) within cloud residuals, directly sampled by a multiparameter bioaerosol spectrometer coupled to a ground-based counterflow virtual impactor inlet at the Zeppelin Observatory (475 m a.s.l.) in Ny-Ålesund, Svalbard. fPBAP concentrations (10−3–10−2 L−1) and contributions to coarse-mode cloud residuals (0.1 to 1 in every 103 particles) were found to be close to those expected for high-temperature INPs. Transmission electron microscopy confirmed the presence of PBAPs, most likely bacteria, within one cloud residual sample. Seasonally, our results reveal an elevated presence of fPBAPs within cloud residuals in summer. Parallel water vapor isotope measurements point towards a link between summer clouds and regionally sourced air masses. Low-level MPCs were predominantly observed at the beginning and end of summer, and one explanation for their presence is the existence of high-temperature INPs. In this study, we present direct observational evidence that fPBAPs may play an important role in determining the phase of low-level Arctic clouds. These findings have potential implications for the future description of sources of ice nuclei given ongoing changes in the hydrological and biogeochemical cycles that will influence the PBAP flux in and towards the Arctic
2024
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Control and fate of atmospheric trace metals. Proceedings of the NATO Advanced Research Workshop on Fate and Control of Toxic Metals in the Atmosphere. Gardermoen - Oslo, Norway. 12-16 September 1988. NATO ASI Series, Series C: Mathematical and physical sciences, vol. 268
1989
Denne rapporten presenterer databasen i ICP Materialer for perioden oktober 2017 – november 2018. Den inkluderer
miljødata fra ICP Materialer trend-eksponeringsprogrammet for 2017 – 2018, og i tillegg data for temperatur, relativ
fuktighet og nedbørsmengde tilbake til slutten av forrige års-eksponering i oktober/november 2015. Databasen består av
meteorologiske data (T, RF og nedbørsmengde) og forurensningsdata, som gasskonsentrasjoner, mengde ioner i nedbør, partikkelkonsentrasjoner og mengde avsatte partikler.
NILU
2020
This report presents the ICP Materials database for the period October 2020 to December 2021. It includes environmental data from the ICP Materials trend exposure programme for 2020 - 2021 and, in addition, data for temperature, relative
humidity, and precipitation amount back to the end of the previous annual exposure programme in October/November 2018. The database consists of meteorological data (T, RH and precipitation amount) and pollution data: Gas concentrations, amounts of ions in precipitation, particle concentrations and amounts of particle deposition.
NILU
2023
Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern. NILU PP
2010
Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern. NILU PP
2010
Cooling of the wintertime Arctic stratosphere induced by the western Pacific teleconnection pattern.
2010
2004
2010