Sensitivity Studies of the Effects of Model Formulation on the Evaluation of Control Strategies for Photochemical Air Pollution Formation in the United Kingdom

Hov, Øystein; Derwent, R.G.

doi:10.1080/00022470.1981.10465355

Cited by 8 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Lesser degree of nonlinearity exists at urban levels of 03 precursors (U.S. EPA, 1977;Hov and Derwent, 1981;Sakamaki et al 1982). Lesser degree of nonlinearity exists at urban levels of 03 precursors (U.S. EPA, 1977;Hov and Derwent, 1981;Sakamaki et al 1982).…”

Section: Ozone Formation In Summermentioning

confidence: 99%

Tropospheric Ozone

1988

View full text Add to dashboard Cite

show abstract

Section: Ozone Formation In Summermentioning

confidence: 99%

Tropospheric Ozone

1988

View full text Add to dashboard Cite

show abstract

“…Με βάση λοιπόν αυτό το σκεπτικό, η αρχή της 'αντικατάστασης', η οποία προτείνει τις ελεγχόμενες εκπομπές των πιο δραστικών υδρογονανθράκων και την βαθμιαία αντικατάσταση τους με άλλους, λιγότερο δραστικούς υδρογονάνθρακες εφαρμόζεται συχνά,[155]. Σε αυτό όμως το σημείο, αντιτάσονται πιο πρόσφατες μελέτες,[156],[157],[158], οι οποίες αφορούν την ρύπανση σε μη αστικές περιοχές και οι οποίες δείχνουν ότι οι μεγαλύτεροι χρόνοι αντίδρασης των λιγότερο δραστικών ενώσεων μπορούν να έχουν ως αποτέλεσμα την μεταφορά τους και τον τελικό σχηματισμό φωτοοξειδωτικών στις μη αστικές περιοχές. Είναι λοιπόν σαφές, πως η εύρεση μίας πραγματικά αποτελεσματικής στρατηγικής, για μία δεδομένη περιοχή, είναι όχι μόνο ένας βασικός στόχος των ατμοσφαιρικών μελετών αλλά και ένας τομέας που χρειάζεται λεπτομερέστατη περαιτέρω μελέτη.Η εργασία μας εξετάζει κατά πόσο οι στρατηγικές ελέγχου των εκπομπών των οξειδίων του αζώτου θα πρέπει να χρησιμοποιούνται παράλληλα με τις στρατηγικές εκείνες, οι οποίες στηρίζονται στον έλεγχο των εκπομπών των δραστικών οργανικών ενώσεων για την μείωση των φωτοχημικών ρύπων.…”

unclassified

Σκοτεινοι Και Φωτολυτικοι Μετασχηματισμοι Αζωτουχων Ενωσεων Ατμοσφαιρικης Σημασιας.

Μινεσχοσ¹

View full text Add to dashboard Cite

with the mentioned sulfur compounds were determined at 3.7, 2.8, 13.0, 0.9 and 1.8 χ 10 16 cm 3 s _1 respectivelly. We also noticed the formation of a standard compound, which is considered to be of the type R-SNO.The irradiations of the hydrocarbons -the main part of this study -were studied in two smog chambers, one glass and one of teflon film, because due to the different absorbsnce characteristics of the two materials, completely different chemistry was expected to take place.By varying the hydrocarbon concentration under constant N0 2 concetration at 100 ppb, in both chambers, it is shown that η-butane and toluene have the lowest forming potential for ozone at all levels of the ratio HC/NO x , while olefins are particularly reactive and form the greatest amounts of ozone at low levels of the ratio HC/NO x . We point out that the rate of the reaction of hydrocarbons with the hydroxyl radicals is not, in all cases, a criterion for the ozone that can be formed. Thus, t-2-butene seems to be less reactive than expected on the base of the rate of its reaction with OH, since the internal double bond of the molecule reacts with ozone and consequently the latter is not only formed but destroyed as well. Propylene is a particular case, because as it has intermediate reactivity with both the hydrxyl radicals and ozone, it finally favours the formation of ozone. Concerning the formation of PAN we found out that the potential of the five hydrocarbons is of the following order : t-2-butene > propylene > toluene > aethene > η-butane. The latter, because of its slow reaction with hydroxyl radicals, forms the lowest amount of PAN, aethen is, as mentioned before, a special case while olefins form the highest amounts of PAN and, because of its chemical structure t-2-butene forms twice the quantity formed by propylene. Toluene is forming PAN in higher than the expected amounts, probably due to the the formation of predominant for PAN compounds, diacetyl and methyl glyoxal, formed by aromatic species.At the second section of the irradiations in the teflon chamber, under increasing concentration of N0 2 and constant concentration of the hydrocarbon, we noticed an increase in the formation of ozone formed as the N0 2 concentration increased, until the point of deactivation of the system. The fact that the maximums of ozone were determined at longer times than those of our previous experiments, is something which we expected because of the reaction of ozone with the NO formed. As far as PAN is concerned, we noticed a decrease at its maximum as the N0 2 levels increase,

show abstract

Model Studies of Background Ozone Formation

Liu

1988

Tropospheric Ozone

View full text Add to dashboard Cite

Sensitivity Studies of the Effects of Model Formulation on the Evaluation of Control Strategies for Photochemical Air Pollution Formation in the United Kingdom

Cited by 8 publications

References 9 publications

Tropospheric Ozone

Tropospheric Ozone

Σκοτεινοι Και Φωτολυτικοι Μετασχηματισμοι Αζωτουχων Ενωσεων Ατμοσφαιρικης Σημασιας.

Model Studies of Background Ozone Formation

Contact Info

Product

Resources

About