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Advanced Ozone Modeling and Analysis in Atmospheric Chemistry: A Comprehensive Study

This study focuses on the detailed modeling of ozone dynamics, incorporating advanced atmospheric chemistry and analysis techniques with a focus on stratospheric and tropospheric interactions. The research provides insights into the impact of various parameters on ozone production and loss rates, including temperature, ozone mixing ratio, and total ozone column. The model also evaluates the influence of perturbations and perturbation responses on the equilibrium state. Version 2.1 of the model introduces the consideration of Khet coefficients and cold air tracer effects. The analysis includes the evaluation of ozone changes in response to variations in nitrous oxides, carbon monoxide, and water vapor concentrations. Rapid evaluation techniques are employed to assess steady-state ozone variations in various atmospheric regions, offering valuable insights into atmospheric composition dynamics.

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Advanced Ozone Modeling and Analysis in Atmospheric Chemistry: A Comprehensive Study

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  1. ADOMOCA Meeting Novembre 2008 D. Cariolle

  2. The linerized ozone scheme [Cariolle and Déqué, JGR, 1986; Cariolle et Teyssèdre, ACPD, 2007]  rO3 /  t = A1 + A2 (rO3 - A3) + A4 (T – A5) + A6 ( - A7) + A8 rO3 A1 = (P-L) : Production-Loss rate A2 =  (P-L) /  rO3 A3 ; rO3 : ozone mixing ratio A4 =  (P-L) /  T A5 ; T : temperature A6 =  (P-L) /   A7 ;  : ozone column A8 = - Khet 2D coefficients ( , p) from the 2D photochemical Model (MOBIDIC) quadratic function of total chlorine

  3. The 2D MOBIDIC model [Cariolle, CNRM, 1984 ; Teyssèdre, UPS, 1994] • 2 dimensions (latitude, pressure) • thermodynamic forcing from ARPEGE-Climat (T, v*, w*) • Stratospheric chemistry: 56 species, 175 reactions • impact studies • parameterisation of the ozone Production and Loss rates: • At equilibrium => (P-L) ; rO3 ; T ;  • perturbations +/- 10%;+/- 10 K => new equilibrium:  (P-L) /  rO3 ; •  (P-L) /  T ;  (P-L) /  

  4. Version 2.1 Original: Version 1.0

  5. Version 2.1 A8 = - Khet Khet = (1/8days)(Clx/2ppbv)2 (daytime and T<195K)

  6. COLD AIR TRACER • x/  t = 1/1 (1-x) – 1/ 2 x With 1equal to a few hours and 1/ 2=0 if T<195 K And 2equal to several days (rate of HNO3 destruction) and 1/ 1=0 if T> 195K  rO3 /  t = A1 + …. + A8 rO3 T>195 K T<195 K With A8 = - Khet .x. (195/T) 4,5 (daytime)

  7. v2 without cold tracer v2 with cold tracer

  8. Analyse CEPMMT 5/11/2007

  9.  rO3 /  t = A1 + A2 (rO3 - A3) + A4 (T – A5) + A6 ( - A7) + A8 rO3 • + B1 (rNOx - B2) • + B3 (rCO - B4) • + B5 (rH2O - B6) • B1 =  (P-L) /  rNOy ; B3 =  (P-L) /  rCO ; B5 =  (P-L) /  rH2O • B2 = rNOy ; B4 = rCO ; B6 = rH2O from the 2D photochemical rNOy - B2 or (rNOy - B2)/B2 from aircraft, boats, road traffic scenarios and CTM. Idem for CO and H2O

  10. Destruction • in the upper • stratosphere • Production • in the lower stratosphere and troposphere

  11. Destruction in • most of the stratosphere

  12. Rapid evaluation at steady state: ∆rO3 (%) = (- B1 B2 /A1A2 )∆rNOy(%) Or ∆rO3 (%) = (- B3 B4 /A1A2 )∆rCO(%) Or ∆rO3 (%) = (- B5 B6 /A1A2 )∆rH2O(%)

  13. The linerized CO and HNO3 schemes  rx/  t = A1 + A2 (rx - A3) + A4 (T – A5) A1 = (P-L) : Production-Loss rate A2 =  (P-L) /  rx A3 ; rx: CO or HNO3 mixing ratio A4 =  (P-L) /  T A5 ; T : temperature 2D coefficients ( , p) from the 2D photochimical Model (MOBIDIC)

  14. Assimilation: • CO: • ODIN, MLS profiles • MOPIT, IASI columns • HNO3: • MLS profiles • IASI columns

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