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1.
Pipistrel Taurus G4
Gregor Veble, Jure Tomažič, Tine Tomažič, Vid Plevnik, Franc Popit, Sašo Kolar, Rado Kikelj, Jacob W. Langelaan, Kirk Miles, 2011, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: električna letala, konstrukcija, učinkovitost, modeliranje zmogljivosti, poskusi letenja
Objavljeno: 10.07.2015; Ogledov: 3497; Prenosov: 18
URL Polno besedilo (0,00 KB)

2.
Substantial brown carbon emissions from wintertime residential wood burning over France
Jean-Luc Jaffrezo, Valérie Gros, Griša Močnik, Gilles Levigoureux, Marta Dominik-Sègue, Eve Chrétien, Sabrina Pontet, Gregory Gille, Florie Chevrier, Véronique Jacob, Jean-Eudes Petit, Alexandre Albinet, Yunjiang Zhang, Olivier Favez, 2020, izvirni znanstveni članek

Opis: Brown carbon (BrC) is known to absorb light at subvisible wavelengths but its optical properties and sources are still poorly documented, leading to large uncertainties in climate studies. Here, we show its major wintertime contribution to total aerosol absorption at 370 nm (18–42%) at 9 different French sites. Moreover, an excellent correlation with levoglucosan (r2 = 0.9 and slope = 22.2 at 370 nm), suggesting important contribution of wood burning emissions to ambient BrC aerosols in France. At all sites, BrC peaks were mainly observed during late evening, linking to local intense residential wood burning during this time period. Furthermore, the geographic origin analysis also highlighted the high potential contribution of local and/or small-regional emissions to BrC. Focusing on the Paris region, twice higher BrC mass absorption efficiency value was obtained for less oxidized biomass burning organic aerosols (BBOA) compared to more oxidized BBOA (e.g., about 4.9 ± 0.2 vs. 2.0 ± 0.1 m2 g−1, respectively, at 370 nm). Finally, the BBOA direct radiative effect was found to be 40% higher when these two BBOA fractions are treated as light-absorbing species, compared to the non-absorbing BBOA scenario.
Najdeno v: osebi
Ključne besede: Brown carbon, Multi sites, Residential wood burning, Mass absorption efficiency, France
Objavljeno: 20.07.2020; Ogledov: 991; Prenosov: 0
.pdf Polno besedilo (2,94 MB)

3.
Atmospheric peroxyacetyl nitrate (PAN)
H. B. Singh, A. Roiger, Katja Džepina, D. B. Millet, Jiandong Mao, F. Paulot, R. M. Yantosca, M. P. Sulprizio, E. V. Fischer, D. J. Jacob, 2014, izvirni znanstveni članek

Opis: Peroxyacetyl nitrate (PAN) formed in the atmospheric oxidation of non-methane volatile organic compounds (NMVOCs) is the principal tropospheric reservoir for nitrogen oxide radicals (NOx = NO + NO2). PAN enables the transport and release of NOx to the remote troposphere with major implications for the global distributions of ozone and OH, the main tropospheric oxidants. Simulation of PAN is a challenge for global models because of the dependence of PAN on vertical transport as well as complex and uncertain NMVOC sources and chemistry. Here we use an improved representation of NMVOCs in a global 3-D chemical transport model (GEOS-Chem) and show that it can simulate PAN observations from aircraft campaigns worldwide. The immediate carbonyl precursors for PAN formation include acetaldehyde (44 % of the global source), methylglyoxal (30 %), acetone (7 %), and a suite of other isoprene and terpene oxidation products (19 %). A diversity of NMVOC emissions is responsible for PAN formation globally including isoprene (37 %) and alkanes (14 %). Anthropogenic sources are dominant in the extratropical Northern Hemisphere outside the growing season. Open fires appear to play little role except at high northern latitudes in spring, although results are very sensitive to plume chemistry and plume rise. Lightning NOx is the dominant contributor to the observed PAN maximum in the free troposphere over the South Atlantic.
Najdeno v: osebi
Ključne besede: peroxyacetyl nitrate, non-methane volatile organic compounds, global 3-D chemical transport model, GEOS-chem
Objavljeno: 11.04.2021; Ogledov: 391; Prenosov: 0
.pdf Polno besedilo (4,98 MB)

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