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GENERAL OVERVIEW OF MSC’s CONTRIBUTION to CRTI COMPONENT 2

GENERAL OVERVIEW OF MSC’s CONTRIBUTION to CRTI COMPONENT 2. S téphane Bélair Jocelyn Mailhot. 3 rd Annual Meeting on CRTI Urban Canyon Project – Dorval QC – 22-23 August 2006. MAIN OBJECTIVES of OUR ACTIVITIES.

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GENERAL OVERVIEW OF MSC’s CONTRIBUTION to CRTI COMPONENT 2

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  1. GENERAL OVERVIEW OF MSC’s CONTRIBUTION to CRTI COMPONENT 2 Stéphane Bélair Jocelyn Mailhot 3rd Annual Meeting on CRTI Urban Canyon Project – Dorval QC – 22-23 August 2006

  2. MAIN OBJECTIVES of OUR ACTIVITIES • Improve the representation of urban surfaces and boundary layer in meso--scale and micro--scale atmospheric models in order to: • Improve forecasting of the urban environment at the mesoscales • Produce realistic representation of dispersion on the mesoscales • Provide better initial and lateral boundary conditions for high-resolution dispersion models

  3. Urban Modeling System • Main features of the new urban modeling system: • High-resolution capability for micro-α scale applications (down to ~250m) • Urban processes with Town Energy Balance (TEB) scheme • Generation of fields characterizing urban type covers • 3D LES-type turbulent diffusion scheme. • First validation of the urban modeling system: • Impact of urban processes on structure of urban boundary layer • Comparison against observations from the Joint Urban 2003 experimental campaign in Oklahoma City in July 2003 • Comparison against observations from MUSE-2005 (March-April 2005) for cold conditions and snow melt period.

  4. Prototype of Urban Modeling System « Urbanized » Regional-15 km GEM-variable Off-line surface modeling At 100-200 m • TEB • Urban surfaces • Anthropogenic sources Built areas are parameterized, i.e., we need IC + LBC « Urbanized » Meso--scale 2.5 km GEM-LAM 1D (vertical) turbulence is sufficient Operational • TEB • Urban surface databases • Anthropogenic heat sources IC + LBC Prototype « Urbanized » Meso--scale 1km GEM-LAM IC + LBC « Urbanized » Micro--scale 250 m MC2-LAM 3D turbulence is required IC + LBC High-res Microscale (CFD) Partners Built areas are resolved

  5. Modeling prototype configuration • Preliminary results based on Joint Urban 2003 Experiment • IOPs 6 and 9 (July 2003) - Clear sky / southerly winds 15-km Regional model IC + LBC GEM-LAM 2.5 km GEM-LAM 250 m IC + LBC OKC TEB is used in 2.5 km, 1 km, and 250-m models IC + LBC GEM-LAM 1 km Incoming flow

  6. Issues with high-resolution (250 m) grid 1000-m Vertical Motion OKC Flow is quasi-laminar in the first portion of the domain (why we use a rectangular domain oriented along the low-level winds) (valid at 2100 UTC)

  7. PRESENTATIONS to FOLLOW • Urban surface databases (Leroux) • Urban anthropogenic flux databases (Benbouta) • MUSE-2 and CFCAS field campaign (Benjamin / Chagnon) • Mesoscale 3D turbulence (Mailhot / Zhu) • Oklahoma City mesoscale model results (Lemonsu) • Mesoscale model coupling with CFD model (Bélair)

  8. Conferences and Publications • Conferences, presentations: • Royal Met. Society 2005 Conference: Sept 2005 - Exeter UK • 6th Symposium on Urban Environment / AMS Annual Meeting: Jan 2006 - Atlanta GA (5 presentations) • 17th Symposium on Boundary Layers and Turbulence: May 2006 - San Diego CA • Visit to LLNL/ NARAC: June 2206 – Livermore CA • 6th International Conference on Urban Climate: June 2006 - Göteborg SWEDEN (4 presentations) • Publications: • 2 papers in IAUC (International Association for Urban Climate) Newsletter, April and June issues (http://www.urban-climate.org) • CMOS Bulletin SCMO, August 2006, 34, 110-114 • Newsletter of European Geosciences Union, September issue (http://www.the-eggs.org) • 2 papers to be submitted to J. Appl. Meteor. on 1) Urban cover classification and 2) MUSE-1

  9. Outlook • Longer-term wider effort in Canada: • Extension of urban model to major Canadian cities • Development of a national observation network • Urban sites for surface and upper-air profiles • Monitoring of the urban boundary layer • Partnership with various organizations across Canada • Funding by CFCAS (Canadian Foundation for Climate and Atmospheric Sciences)

  10. CFCAS Urban Proposal Network Grant Proposal to the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) “ENVIRONMENTAL PREDICTION FOR CANADIAN CITIES” Co-Principal Investigators: J.A. Voogt (The University of Western Ontario) T.R. Oke (The University of British Columbia) Total requested Budget: $1,447,000 February 10th, 2006

  11. Environmental Prediction for Canadian Cities5 Major Objectives Forecasting Weather for Canadian Cities 5 Major Objectives • Field observations (Montreal + Vancouver: urban / suburban / rural sites) • Oke, Benjamin, Strachan, Grimmond, Voogt • Detailed urban heat and water balances (continuous 2-year measurements) • Canadian optimized version of TEB-ISBA • Bélair, Lemonsu, Mailhot, Oke • Specifics of Canadian cities: building materials, vegetation, snow and cold winter conditions • Modeling studies of the urban boundary layer • Mailhot, Bélair, Lemonsu, Masson, Zawadzki • Impact of TEB on UBL and clouds/precipitation/types; urban-induced circulations • Urban component of off-line modeling system • Bélair, Lemonsu • Urban remote sensing • Voogt, Coops, Wang, Bélair, Lemonsu

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