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Long-term ozone data analysis
Vjera Butković, Tomislav Cvitaš, Katja Džepina, Nenad Kezele, Leo Klasinc, 2002, izvirni znanstveni članek

Opis: Various approaches to the analysis of 10-year continuous ozone monitoring from the EUROTRAC-TOR network station Puntijarka near Zagreb are reported. The site has a rural character (45.90degrees N; 15.97degrees E, 980 m a.s.l.) and is representative of the lower troposphere of a wider region. Mean hourly ozone volume fractions measured from 1990-1999, autocorrelation plots for all data and for data for summer periods (May-Sep.), box and whiskers representations of diurnal variations during winter (Nov.-March) and summer periods, mean monthly values and 12-month moving averages, and the Fourier transform of the complete set of 94,248 hourly mean ozone volume fractions are discussed. The data show no increase, or possibly a slight decrease, of the ozone volume fraction toward the end of the decade.
Ključne besede: long term ozone data, fourier analysis, ozone trend analysis, Puntijarka field station
Objavljeno v RUNG: 12.04.2021; Ogledov: 2149; Prenosov: 0
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3.
Use of reactive tracers to determine ambient OH radical concentrations: Application within the indoor environment
Iain R. White, Damien Martin, Maria Paz Muñoz, Fredrik K Petersson, Stephen J Henshaw, Graham Nickless, Guy C Lloyd-Jones, Keven C Clemitshaw, Dudley E. Shallcross, 2010, izvirni znanstveni članek

Opis: The hydroxyl radical (OH) plays a key role in determining indoor air quality. However, its highly reactive nature and low concentration indoors impede direct analysis. This paper describes the techniques used to indirectly quantify indoor OH, including the development of a new method based on the instantaneous release of chemical tracers into the air. This method was used to detect ambient OH in two indoor seminar rooms following tracer detection by gas chromatography- mass spectrometry (GCMS). The results from these tests add to the small number of experiments that have measured indoor OH which are discussed with regard to future directions within air quality research.
Ključne besede: Ozone, Indoor air pollution, Indoor ozone, chemical tracers
Objavljeno v RUNG: 18.07.2019; Ogledov: 3106; Prenosov: 0
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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 v RUNG: 17.07.2019; Ogledov: 2975; Prenosov: 0
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