Overview of the 2005 montreal urban snow experiment muse 2005
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Overview of the 2005 Montreal Urban Snow Experiment (MUSE-2005). Mario Benjamin Bruno Harvey Frédéric Chagnon Gilles Morneau Jocelyn Mailhot Stéphane Bélair Aude Lemonsu. Meteorological Service of Canada. CRTI Urban Canyon Project (0093RD) Annual Meeting – Dorval – August 24-25 2005.

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Overview of the 2005 Montreal Urban Snow Experiment (MUSE-2005)

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Overview of the 2005 montreal urban snow experiment muse 2005

Overview of the 2005Montreal Urban Snow Experiment (MUSE-2005)

Mario Benjamin

Bruno Harvey

Frédéric Chagnon

Gilles Morneau

Jocelyn Mailhot

Stéphane Bélair

Aude Lemonsu

Meteorological Service of Canada

CRTI Urban Canyon Project (0093RD) Annual Meeting – Dorval – August 24-25 2005.


Objectives

Objectives

  • Document the evolution of surface characteristics and energy budgets in a dense urban area during the winter-spring transition

    • Evolution of snow cover from ~100% to 0% in an urban environment

    • Impact of snow on the surface energy and water budgets

    • Quantify anthropogenic fluxes in late winter and spring conditions

  • Evaluate TEB in reproducing the surface characteristics and budgets in these conditions

  • Gain expertise in urban measurements

  • Prepare for a wider effort to be submitted to CFCAS


Acknowledgements

Acknowledgements

  • Prof Sue Grimmond, Indiana University

  • Prof Tim R. Oke, University of British Columbia

  • Prof James A. Voogt, University of Western Ontario

  • Sarah M. Roberts

  • This project was funded by CBRN Research and Technology Initiative as project # 02-0093RD


Selection of the site

Selection of the site

  • Selection of Montreal

    • Large city with significant accumulation of snow (2.14 m/year)

    • Representative of Eastern Canada winter climate

    • Availability of technical staff

    • Meso-scale surface meteorological network

    • Wind profiler, RASS, McGill weather radar

  • Residential location seeked

    • Horizontal homogeneity, two and three-storey attached buildings

    • Away from tall buildings and trees, rivers, mountains, parks

  • Easy and safe access to the site


Selection of the site1

Selection of the site

N

1 km


Continuous measurements 17 march to 14 april 2005

Continuous measurements17 March to 14 April 2005

20 m tower

Radiative surface temperatures

IR camera in heated case

Incoming and outgoing radiation

CNR1 radiometer Kipp & Zonen

Turbulent fluxes by eddy covariance 10Hz

3D sonic anemometer CSAT3

H2O/CO2 analyzer Li-Cor 7500

Fine wire thermocouple ASPTC

Air temperature and humidity in canyons

Radiative temperature of walls


Intensive observation periods

Intensive observation periods

  • Clear skies and southwest winds

  • Four 26-hour IOPs (March 17-18, 22-23, 30-31, April 5-6)

  • Measurements:

    • Hourly radiative surface temperatures using IR thermometer

    • Albedo (5 daytime measurements)

    • Snow depth and density (5 daytime measurements)

    • Pictures to document snow cover, snow melt, wet fraction


Radiative temperatures and roof snow fraction from ir camera

Radiative temperatures and roof snow fraction from IR camera

Sidewalk

Street

Roof

18 March 2005

19 March 2005


Infrared temperatures

Infrared temperatures


Frozen portion of the roof

Frozen portion of the roof

19356 pixels used by images


Evolution of snow cover

Evolution of snow cover

22 March

17 March

30 March

5 April

Alley

Street


Evolution of snow depth

Evolution of snow depth


Evolution of snow density

Evolution of snow density


Radiation measurements

Radiation measurements


Turbulent fluxes

Turbulent fluxes


Next steps

Next steps

  • Complete the quality control and post-processing of the data

  • Format the data into an easy-to-use database

  • Estimate anthropogenic heat using energy consumption data

  • Evaluation of TEB

  • Preparation of the second phase

    • Rural, suburban and urban sites


The muse 2005 team

The MUSE-2005 team

Project management:

Michel Jean

Jocelyn Mailhot

Mario Benjamin

Station installation

Bruno Harvey

Frédéric chagnon

IOP manual measurements

Stavros Antonopoulos

Najat Benbouta

Mario Benjamin

Frédéric Chagnon

Olivier Gagnon

Bruno Harvey

Aude Lemonsu

Gilles Morneau

Radenko Pavlovic

Weather briefings

Jean Morissette

Robert Michaud

Evaluation of TEB

Stéphane Bélair

Aude Lemonsu

Claude Pelletier


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