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The Universal Thermal Climate Index UTCI COST Action 730 dwd.de/UTCI

The Universal Thermal Climate Index UTCI COST Action 730 www.dwd.de/UTCI. Gerd Jendritzky, Germany George Havenith, U.K. Philipp Weihs, Austria Ekaterina Batchvarova, Bulgaria. gerd.jendritzky@meteo.uni-freiburg.de. Why UTCI?.

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The Universal Thermal Climate Index UTCI COST Action 730 dwd.de/UTCI

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  1. The Universal Thermal Climate Index UTCICOST Action 730www.dwd.de/UTCI Gerd Jendritzky, Germany George Havenith, U.K. Philipp Weihs, Austria Ekaterina Batchvarova, Bulgaria gerd.jendritzky@meteo.uni-freiburg.de

  2. Why UTCI? • Assessment of the thermal environment: Key issue in human biometeorology • History: >100 simple thermal indices • Last 35 years: Heat budget modelling • Integration of new knowledge and concerns • Need: Harmonization  UTCI (ISB, WMO) • COST Action (Example: UV-Index) gerd.jendritzky@meteo.uni-freiburg.de

  3. George Havenith, 2003

  4. The human heat budget M + W + Q* + QH + QL + QSW + QRe + S = 0 M Metabolic rate W Mechanical power Q* Radiation budget (Tmrt,v) QH Turbulent flux of sensible heat (Ta,v) QL Turbulent flux of latent heat (diffusion water vapour) (e,v) QSW Turbulent flux of latent heat (sweat evaporation) (e,v) QRe Respiratory heat flux (sensible and latent) (Ta,e) S Storage

  5. Problem: Insufficiency of available assessment procedures. Thus strong need to make use of the progress in science and modelling in thermophysiology of the last 30-40 years.Strategy: Bundling of interdisciplinary expertise in aCOST Action 730 in close cooperation with ISB Commission 6 on UTCI. Experts from 18 countries plus WMO in three working groups : WG1 Thermophysiological modelling and testing WG2 Meteorological and environmental data WG3 Applications. gerd.jendritzky@meteo.uni-freiburg.de

  6. Thermophysiological Assessment of the Thermal Environment Meteorology Descriptive term Thermophysiology PMV - PT* °C PET °C OUT_SET* °C AT 1,2,3 °C (WCT) °C Tsk °C SR kgs-1 ESK Wm-2 Wsk % Icl clo etc. A s s e s s m e n t WG1 Ta Tmrt v e Heat budget models

  7. Action 730 on UTCI Fiala et al. 2001

  8. Simulated whole body and local thermophysiological variables • Mean skin temperature, Tsk,m • Head core temperature (hypothalamus), Thy • Total evaporative heat loss from the skin, Esk • Skin wettedness, wsk • Local skin temperatures of face and hands, Tsk,f,h • Cooling time for Tsk,f,h < 0°C Assessment problem!

  9. Thermophysiological Assessment of the Thermal Environment Meteorology Descriptive term Thermophysiology WG2 PMV - PT* °C PET °C OUT_SET* °C AT 1,2,3 °C (WCT) °C Tsk °C SR kgs-1 ESK Wm-2 Wsk % Icl clo etc. A s s e s s m e n t Ta Tmrt v e Heat budget models

  10. TmrtUniform temperature of a black body enclodure that results in the same radiant heat exchange as under actual conditions • Direct solar radiation • Diffuse solar radiation • Reflected solar radiation • Infrared radiation from the sky • Infrared radiation from the surroundings

  11. Projected Surface Area gerd.jendritzky@meteo.uni-freiburg.de

  12. WG 3 Applications • Public weather service • Public health system • Precautionary planning • Climate impact research

  13. Selected subproplems • Heat budget modelling WG1 • Assessment of physiological variables WG1 • Acclimatisation WG1 • Meteorological input, in particular radiation  TmrtWG2 • Definition of areas of validity, requirements WG2 • Applications (Needs of users) WG3

  14. Summary: Basic features of UTCI • Thermophysiologically significant in the whole • range of heat exchange conditions • Valid in all climates, seasons and scales • Steady-state conditions: Applicability • Independent of individual characteristics • Prediction of whole body and local thermal • effects • Based on the most advanced multi-node models • Temperature scale index • International standard • for human biometeorological core applications

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