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Modelling tracer transport by a cumulus ensemble: Lateral boundary conditions and

Modelling tracer transport by a cumulus ensemble: Lateral boundary conditions and large scale ascent. Advective timescale: necessary condition for model results to be meaningful:. CRM.  Specified lateral boundary conditions (SLBC, horizontal advection)

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Modelling tracer transport by a cumulus ensemble: Lateral boundary conditions and

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  1. Modelling tracer transport by a cumulus ensemble: Lateral boundary conditions and large scale ascent

  2. Advective timescale: necessary condition for model results to be meaningful: CRM  Specified lateral boundary conditions (SLBC, horizontal advection)  Advection of tracers by the large scale vertical wind (VLSAT) Previously (Lu et al., 2000): periodic boundary conditions in cumulus ensemble model also for tracers, but no prescribed horizontal LSA for tracers

  3.  Specified lateral boundary conditions (SLBC, horizontal advection)  Advection of tracers by the large scale vertical wind (VLSAT) Previously: the effect of net large scale ascent e.g. over the Pacific Warm Pool is considered for q,  BUT IT WAS NEGLECTED FOR TRACERS

  4. motivation  case study of the influence of deep convection on atmospheric chemistry

  5. WRF – Weather Research and Forecast Model developed by NCAR and others 2D or 3D  fit for small scale meteorological phenomena www.wrf-model.org

  6. TOGA-COARE intensive flux array

  7. SATELLITE PIC ISCCP clouds IR retrieved cloud top temperatures e.g. Rossow and Schiffer, 1999

  8. MCS schematic

  9. 1000hPa wind Kalnay et al., 1996

  10. Ciesielski et al., 2003 westerly wind burst

  11. ozone Lawrence et al., 2003 flight dates: 94/02/07-94/03/14 Emmons et al., 2000 Thompson et al., 2003 SHADOZ, WOUDC

  12. large scale advection new: and SLBC

  13. Sensitivity Runs – Idealized Tracers  2D runs, 500km horizontal domain  350m vertical grid spacing in the troposphere  Walcek (2000) advection scheme 3(2) different setups:  periodic lateral boundary conditions (PLBC, k=1)  specified lateral boundary conditions (SLBC, k=0) u, (v), w, q, C=  SLBC+VLSAT (k=0)

  14. Hovmöller Diagrams

  15. rain, T, q

  16. Tracer transport  idealized tracers  horizontally homogeneous intialization 3 different tracers:  BL tracer (0-1750m)  MT tracer (7000-8750m)  UT tracer (12250-14000m)

  17. Tracer transport

  18. Tracer transport

  19. Tracer transport

  20. Tracer transport

  21. Tracer transport

  22. time integrated, horizontally avearged tendendencies

  23. conclusions/perspectives  presented a study of idealized tracer transport  SLBC necessary for  TLSAT important (not included in previous study)  chemistry version based on MATCH  data from measurements necessary for SLBC  use WRF nesting capability  comparison with SCM

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