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Methyl halide emission estimates from domestic biomass burning in Africa
M Iqbal Mead, M Anwar H Khan, Iain R White, Graham Nicless, Dudley E Shallcross, 2008, izvirni znanstveni članek

Opis: Inventories of methyl halide emissions from domestic burning of biomass in Africa, from 1950 to the present day and projected to 2030, have been constructed. By combining emission factors from Andreae and Merlet [2001. Emission of trace gases and aerosols from biomass burning. Global Biogeochemical Cycles 15, 955-966], the biomass burning estimates from Yevich and Logan [2003. An assessment of biofuel use and burning of agricultural waste in the developing world. Global Biogeochemical Cycles 17(4), 1095, doi:10.1029/2002GB001952] and the population data from the UN population division, the emission of methyl halides from domestic biomass usage in Africa has been estimated. Data from this study suggest that methyl halide emissions from domestic biomass burning have increased by a factor of 4-5 from 1950 to 2005 and based on the expected population growth could double over the next 25 years. This estimated change has a non-negligible impact on the atmospheric budgets of methyl halides.
Ključne besede: Africa, Biofuel, Domestic biomass burning, Emission factor, Methyl halide
Objavljeno: 17.07.2019; Ogledov: 0; Prenosov: 0
.pdf Polno besedilo (781,64 KB)

3.
A study of pollutant concentration variability in an urban street under low wind speeds
Adrian Dobre, Graham Nickless, Iain R White, Catheryn S Price, Damien Martin, Dudley E Shallcross, 2008, izvirni znanstveni članek

Opis: The short time‐scale variability in pollutant concentrations in an urban street under very low wind speed conditions and short source–receptor distance has been investigated using the inert tracer sulfur hexafluoride (SF6) as a continuous point‐source (release times ≥ 5 min), and fast detection using separation by gas chromatography coupled with a μ‐electron capture detector (ECD). The results are complex but can be broadly interpreted in terms of horizontal wind speed and direction coherence. Comparisons with a simple dispersion model suggest that observed time‐averaged maximum concentrations approach predicted values, whilst instantaneous maximum concentrations vary greatly and would therefore be difficult to predict.
Ključne besede: dispersion, tracer, intermittency
Objavljeno: 17.07.2019; Ogledov: 0; Prenosov: 1
.pdf Polno besedilo (289,67 KB)

4.
An estimation of the global emission of methyl bromide from rapeseed (Brassica napus) from 1961 to 2003
2008, izvirni znanstveni članek

Opis: Gan et al. [Gan, J., Yates, S.R., Ohr, H.D., Sims, J.J., 1998. Production of methyl bromide by terrestrial higher plants. Geophysical Research Letters 25 (19), 3595–3598] have reported that plants of the family Brassicaceae take up bromide from soils and subsequently release methyl bromide (CH3Br) to the atmosphere deriving a significant emission from this source of about 7 Gg(109 g) yr−1. In this study, we determine a yearly global emission rate for CH3Br from one such species, rapeseed, from 1961 to 2003 using data on crop harvest index and growth rate in conjunction with global production data. This study suggests that CH3Br emissions from rapeseed have increased 10-fold from 1961 to 2003 and by a factor of 3–4 since 1980. It also suggests that the geographical distribution of emissions has also changed substantially in the last 40 yr. The annual emission of CH3Br from mustard and cabbage is also estimated; whilst relative levels emitted from these species are less significant, as these crops are continually exploited for new applications CH3Br emissions are set to increase.
Ključne besede: CH3Br, Rapeseed, Brassica, Ozone, Biosphere
Objavljeno: 17.07.2019; Ogledov: 0; Prenosov: 0
.pdf Polno besedilo (574,91 KB)

5.
Determination of source specific black carbon and CO2 emission rates by means of 222Rn tracer
Asta Gregorič, Luka Drinovec, Irena Ježek, Janja Vaupotič, Griša Močnik, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: black carbon emission, radon
Objavljeno: 17.07.2019; Ogledov: 0; Prenosov: 0
.pdf Polno besedilo (13,70 MB)

6.
Evaluation of VOC denuder efficiency and positive artefactdue to denuder breakthrough using TCA08
Asta Gregorič, Gašper Lavrič, Martin Rigler, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: VOC denuder, TCA08, sampling artefact
Objavljeno: 17.07.2019; Ogledov: 0; Prenosov: 0
.pdf Polno besedilo (6,60 MB)

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Photothermal spectrophotometer for meaurements of low absorption in liquid samples
J. Akbar, Humberto Cabrera, Dorota Korte Kobylinska, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: photothermal spectroscopy techniques, halogen lamps, TL signal
Objavljeno: 16.07.2019; Ogledov: 1; Prenosov: 0
.pdf Polno besedilo (324,00 KB)

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