Presentation Slides for Chapter 11, Part 2 of Fundamentals of Atmospheric Modeling 2 nd Edition Mark Z. Jacobson Department of Civil & Environmental Engineering.

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Presentation transcript:

Presentation Slides for Chapter 11, Part 2 of Fundamentals of Atmospheric Modeling 2 nd Edition Mark Z. Jacobson Department of Civil & Environmental Engineering Stanford University Stanford, CA March 28, 2005

Alkene Reaction With Ozone Ethene(11.89)

Alkene Reaction With Ozone Criegee biradical reaction(11.90) Excited criegee biradical decomposition(11.91)

Alkene Reaction With Ozone Propene(11.92)

Alkene Reaction With Ozone Methylcriegee biradical reaction(11.93) Excited methylcriegee biradical decomposition(11.94)

Alkene Reaction With Nitrate Ethene --> nitrated organic radicals(11.95) Propene --> nitrated organic radicals(11.96)

Aromatic Reaction With OH Toluene oxidation(11.97)

Aromatic Reaction With OH Benzylperoxy radical reaction with NO(11.98)

Aromatic Rxn With Hydroxyl Radical Toluene-hydroxyl radical adduct reaction(11.99)

Fate of Cresol Cresol --> methylphenylperoxy radical and nitrocresol(11.100)

Isoprene Reaction With OH (11.101) All six products convert NO to NO 2

Fate of Isoprene Products Methacrolein production via second product(11.102) Methylvinylketone production via fifth product(11.103)

Isoprene Reaction With Ozone (11.104)

Alcohol Reactions Methanol oxidation by OH (36-h lifetime)(11.105)

Alcohol Reactions Ethanol oxidation by OH (10-h lifetime)(11.106)

Carbon Bond Lumping Organic gases lumped into surrogate groups PAR (paraffins) -- Single carbon atoms with a single-bond between them OLE (olefins) -- Terminal carbon atom pair with a double-bond between the two atoms ALD2 -- Non-terminal carbon atom pairs with a double bond attached to one of the carbons and terminal two-carbon carbonyl groups [C-C(=O)H] KET -- Single carbon ketone groups (C=O) TOL (toluene) -- 7-carbon aromatics XYL (m-xylene) -- 8-carbon aromatics ISOP (isoprene) -- Terpenes UNR -- Unreactive

Carbon Bond Lumping Table 11.7 Ethane : 0.4 PAR UNR n-Butane : 4 PAR 2,2,4-Trimethylpentane : 8 PAR

Carbon Bond Lumping Table 11.7 Trans-2-butene : 2 ALD2 Propene : 1 PAR + 1 OLE Propionaldehyde : 1 PAR + 1 ALD2

Carbon Bond Lumping Table 11.7 Benzaldehyde : 1 ALD2 + 5 UNR 1,2,3-Trimethylbenzene : 1 PAR + 1 XYL Ethylbenzene : 1 PAR + 1 TOL

Vertical Profile of Ozone Fig Altitude (km)

Column Abundance of Ozone Fig. 11.4

Stratospheric Chemistry Ozone mixing ratios stratosphere ≈ 10 ppmv free troposphere ≈ 40 ppbv urban air ≈ ppmv Ozone production in the stratosphere Oxygen photolysis( )

Stratospheric Chemistry Natural ozone formation(11.110) (11.109) Ozone photolysis(11.111) (11.112)

Natural Ozone Destruction by NO x Nitrous oxide reaction: 10% of N 2 O destruction(11.113) Nitrous oxide photolysis: 90% of N 2 O destruction(11.114)

Natural Ozone Destruction by NO x NO catalytically destroys ozone in upper stratosphere( )

Natural Ozone Destruction by HO x Hydroxyl radical formation in stratosphere(11.115)

Natural Ozone Destruction by HO x OH catalytically destroys ozone in lower stratosphere( )

Removal of HO x and NO x (11.118) (11.124) (11.119) Nitric acid and peroxynitric acid photolysis are slow

Stratospheric Source of Water Vapor (11.125)

Changes in Monthly-Averaged Global Ozone From Fig Percent difference in global ozone from 1979 monthly average

Variation with Latitude of October Zonally-Averaged Ozone in ‘79, ‘99, ‘00 Fig Ozone (Dobson units)

Variation with Altitude of CFCs and Other Chlorinated Compounds Fig Altitude (km)

Variations With Altitude of CFCs and Other Chlorinated Compounds Photolysis of chlorinated compounds above 20 km(11.126) (11.127)

Natural Sources of Chlorine Methyl chloride photolysis(11.130) Methyl chloride scavenging by hydroxyl radical(11.128)

Chlorine Emission to Stratosphere WMO (1994) Chemical Percent emission to stratosphere Anthropogenic sources CFC-12 (CF 2 Cl 2 )28 CFC-11 (CFCl 3 )23 Carbon tetrachloride (CCl 4 )12 Methyl chloroform(CH 3 CCl 3 )10 CFC-113 (CFCl 2 CF 2 Cl)6 HCFC-22 (CF 2 ClH)3 Natural sources Methyl chloride (CH3Cl)15 Hydrochloric acid (HCl)3 Total100

Ozone Destruction by Chlorine Chlorine catalytic ozone destruction cycle(11.130) (11.131) (11.132) Only 1% of chlorine is typically active as Cl or ClO

Conversion of Active Chlorine to Reservoirs Conversion of Cl and ClO(11.133) (11.134)

Conversion of Reservoirs to Active Chlorine HCl reservoir leaks(11.135) ClONO 2 reservoir leaks

Ozone Destruction by Bromine CH 3 Br = methyl bromide (produced biogenically in the oceans and anthropogenically as soil fumigant) Photolysis of methyl above 20 km(11.137)

Ozone Destruction by Bromine Catalytic ozone destruction by bromine( )

Conversion of Active Bromine to Reservoirs Conversion of Br and BrO(11.141) (11.142)

Conversion of Reservoirs to Active Bromine HBr and BrONO 2 reservoir leaks(11.143)

Change in Size of Antarctic Ozone Hole Fig Ozone minimum (Dobson units) Ozone hole area (10 6 km 2 )

Polar Stratospheric Cloud Reactions Type I Polar Stratospheric Clouds (PSCs) nitric acid and water temperature of formation < 195 K diameter ≈  m number concentration ≈ 1 particle cm -3 Type II Polar Stratospheric Clouds Water ice temperature of formation < 187 K diameter ≈  m number concentration ≈ 0.1 particle cm -3

Polar Stratospheric Cloud Reactions Reactions on Polar Stratospheric Cloud Surfaces( )

Surface Reaction Rates First-order rate coefficient (s -1 ) (11.150) Thermal speed of impinging gas (cm s -1 )(11.151)

Reaction Probabilities Table 11.9 Fractional loss of a species from the gas phase due to reaction with a particle surface. Accounts for diffusion of the gas to the surface and reaction with the surface. Reaction Probability Reaction Type I PSCType II PSC ClONO 2 (g) + H 2 O(a) ClONO 2 (g) + HCl(a) N 2 O 5 (g) + H 2 O(a) N 2 O 5 (g) + HCl(a) HOCl(g) + HCl(a)0.10.3

Polar Ozone Destruction Cl 2 and HOCl photolysis in early spring( ) Chlorine nitrite photolysis in early spring(11.163)

Polar Ozone Destruction Catalytic ozone destruction by dimer mechanism( )

Polar Ozone Destruction A second catalytic cycle that involves bromine( )

Conversion of Cl Reservoirs to Active Cl Fig. 11.9

Ozone Regeneration Fig Change in globally-averaged ozone column abundance during two global model simulations in which all ozone was initially removed and chlorine was present and absent, respectively. Average global ozone column (Dobson units)

Regeneration of Ozone Vertical Profile Time-evolution of modeled profile of ozone (a) mixing ratio and (b) number concentration at 34 o N latitude, starting with zero ozone. Altitude (km) Fig Altitude (km)