The impact of natural non-methane hydrocarbon oxidation on the free radical and ozone budgets above a eucalyptus forest

Poisson, N.; Kanakidou, Maria; Bonsang, B.; Behmann, T.; Burrows, J. P.; Fischer, H.; Gölz, C.; Harder, Hartwig; Lewis, Alastair C.; Moortgat, G. K.; Nunes, Teresa; Pio, Casimiro; Platt, U.; Sauer, Frank; Schuster, G.; Seakins, Paul W.; Senzig, J.; Seuwen, R.; Trapp, D.; Volz‐Thomas, A.; Zenker, T.; Zitzelberger, R.

doi:10.1016/s1465-9972(01)00016-2

Cited by 32 publications

(19 citation statements)

References 28 publications

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“…The hydrocarbon chemical scheme used in the present study is an update of the Poisson et al (2001) scheme to IUPAC recommendations (Atkinson et al, 2006) and includes NO 3 radical and some surface reactions as described by Tsigaridis and Kanakidou (2002) and Vrekousis et al (2004Vrekousis et al ( , 2006. No direct heterogeneous ozone losses are taken into account whereas NO x and RO x heterogeneous losses are parameterized as explained by Tsigaridis and Kanakidou (2002) and Vrekoussis et al (2004).…”

Section: Model Descriptionmentioning

confidence: 99%

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

et al. 2007

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Abstract. In situ continuous hourly measurements of C 2 -C 8 non-methane hydrocarbons (NMHC S ) have been performed from March to October 2006 at two coastal locations (natural and rural) on the island of Crete, in the Eastern Mediterranean. Well defined diel variations were observed for several short lived NMHC S (including ethene, propene, n-butane, n-pentane, n-hexane, 2-methyl-pentane). The daytime concentration of hydroxyl (OH) radicals estimated from these experimental data varied from 1.3×10 6 to ∼4.0×10 6 radical cm −3 , in good agreement with boxmodel simulations. In addition the relative variability of various hydrocarbon pairs (at least 7) was used to derive the tropospheric levels of Cl atoms. The Cl atom concentration has been estimated to range between 0.6×10 4 and 4.7×10 4 atom cm −3 , in good agreement with gaseous hydrochloric acid (HCl) observations in the area. Such levels of Cl atoms can be of considerable importance for the oxidation capacity of the troposphere on a regional scale.

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Section: Model Descriptionmentioning

confidence: 99%

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

et al. 2007

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“…The chemical scheme used for this purpose is based on Poisson et al (2001) as updated by Tsigaridis and Kanakidou (2002) for the inorganic and hydrocarbon chemistry (up to C 5 ) including NO 3 radical reactions with peroxy radicals. Reaction rates have been updated according to Atkinson et al (2003) (IUPAC-web version 2003) recommendations.…”

Section: The Modelmentioning

confidence: 99%

“…During the night its concentration is, in most situations, negligible, thus, NO 3 radicals and O 3 are the main oxidants (e.g. Platt et al, 1984;Wayne et al, 1991;Poisson et al, 2001). NO 3 reacts with a number of VOCs initiating their night time degradation (Atkinson et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

et al. 2004

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Abstract. During the MINOS campaign (28 July-18 August 2001) the nitrate (NO 3 ) radical was measured at Finokalia station, on the north coast of Crete in South-East Europe using a long path (10.4 km) Differential Optical Absorption Spectroscopy instrument (DOAS). Hydroxyl (OH) radical was also measured by a Chemical Ionization MassSpectrometer . These datasets represent the first simultaneous measurements of OH and NO 3 radicals in the area. NO 3 radical concentrations ranged from less than 3×10 7 up to 9×10 8 radicals . cm −3 with an average nighttime value of 1.1×10 8 radicals . cm −3 .The observed NO 3 mixing ratios are analyzed on the basis of the corresponding meteorological data and the volatile organic compound (VOC) observations which were measured simultaneously at Finokalia station. The importance of the NO 3 radical chemistry relatively to that of OH in the dimethylsulfide (DMS) and nitrate cycles is also investigated. The observed NO 3 levels regulate the nighttime variation of DMS. The loss of DMS by NO 3 during night is about 75% of that by OH radical during day. NO 3 and nitrogen pentoxide (N 2 O 5 ) reactions account for about 21% of the total nitrate (HNO 3(g) +NO − 3(g) ) production.

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“…The impact of the observed changes in meteorological and chemical parameters during the eclipse on the oxidant levels has been studied with a chemical box model (ECPL box model; Poisson et al, 2001;Tsigaridis and Kanakidou, 2002;Vrekoussis et al, 2004). The commercially available software FACSIMILE (Curtis and Sweetenham, 1988), which uses automatic time step selection and error control appropriate to solve stiff equations like the system of non linear chemical reactions occurring in the troposphere, was used to solve the differential equations with a high accuracy required for chemistry studies.…”

Section: Box Modellingmentioning

confidence: 99%

“…The condensed chemistry scheme of the box model has been evaluated for its ability to compute oxidant fields by comparison to a detailed chemistry scheme for C1-C5 chemistry as shown in Poisson et al (2001) as well as to several field observations under different conditions in the boundary layer (Poisson et al, 2001;Sciare et al, 2000b;Tsigaridis and Kanakidou, 2002;Vrekoussis et al, 2004;. Ethene, propene, ethane, propane and butanes diurnal mean mixing ratios, measured at Finokalia, Crete, in 2004 (Liakakou, 2007), are adopted in the model as initial conditions for all stations due to the absence of VOC data for the other locations.…”

Section: Box Modellingmentioning

confidence: 99%

Effects on surface atmospheric photo-oxidants over Greece during the total solar eclipse event of 29 March 2006

et al. 2007

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Abstract.This study investigates the effects of the total solar eclipse of 29 March 2006 on surface air-quality levels over Greece based on observations at a number of sites in conjunction with chemical box modelling and 3-D air-quality modelling. Emphasis is given on surface ozone and other photooxidants at four Greek sites Kastelorizo, Finokalia (Crete), Pallini (Athens) and Thessaloniki, which are located at gradually increasing distances from the path of the eclipse totality and are characterized by different air pollution levels. The eclipse offered the opportunity to test our understanding of air pollution build-up and the response of the gas-phase chemistry of photo-oxidants during a photolytical perturbation using both a photochemical box model and a regional air-quality offline model based on the modeling system WRF/CAMx. At the relatively unpolluted sites of Kastelorizo and Finokalia no clear signal of the solar eclipse on surface O 3 , NO 2 and NO concentrations can be deduced from the observations while there is no correlation of observed O 3 , NO 2 and NO with observed global radiation. The box and regional model simulations for the two relatively unpolluted sites indicate that the calculated changes in net ozone production rates between eclipse and non eclipse conditions are rather small compared to the observed short-term ozone variability. Furthermore the simulated ozone lifetime is in the range of a few days at these sites and hence the solar eclipse effects on ozone can be easily masked by local and regional transport. At the polluted sites of Thessaloniki and Pallini, the solar eclipse effects on O 3 , NO 2 and NO concentrations are revealed from both the measurements and modeling with the net effect being a decrease in O 3 and NO and an increase in NO 2 as NO 2 formedCorrespondence to: P. Zanis (zanis@auth.gr) from the reaction of O 3 with NO while at the same time NO 2 is not efficiently photolysed. This result is also supported by a positive correlation of observed global radiation with O 3 and NO and a negative correlation with NO 2 . It is evident from the 3-D air quality modeling over Greece that the maximum effects of the eclipse on O 3 , NO 2 and NO are reflected on the large urban agglomerations of Athens, and Thessaloniki where the maximum of the emissions occur.

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The impact of natural non-methane hydrocarbon oxidation on the free radical and ozone budgets above a eucalyptus forest

Cited by 32 publications

References 28 publications

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Effects on surface atmospheric photo-oxidants over Greece during the total solar eclipse event of 29 March 2006

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The impact of natural non-methane hydrocarbon oxidation on the free radical and ozone budgets above a eucalyptus forest

Cited by 32 publications

References 28 publications

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site

Role of the NO&lt;sub&gt;3&lt;/sub&gt; radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Effects on surface atmospheric photo-oxidants over Greece during the total solar eclipse event of 29 March 2006

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Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign