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Wet Bulb Globe Temperature: Indicating Extreme Heat Risk on a Global Grid.

Chloe Brimicombe1,2,3, Chun Hay Brian Lo4, Florian Pappenberger2

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A new method improves the calculation of the Wet Bulb Globe Temperature (WBGT), a key heat index. This updated approach offers a reliable tool for global heatwave early warning systems.

Keywords:
WBGTclimate change and healthheat stressheatwavesmean radiant temperaturenumerical weather prediction

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Area of Science:

  • Environmental Science
  • Climate Science
  • Occupational Health

Background:

  • The Wet Bulb Globe Temperature (WBGT) is a crucial metric for assessing heat stress across various sectors.
  • Direct WBGT observations are limited, necessitating reliance on less accurate approximations.
  • Existing approximations, like those by Liljegren et al. and the American College of Sports Medicine, have limitations.

Purpose of the Study:

  • To develop and evaluate an updated, globally applicable WBGT calculation method.
  • To assess the accuracy of the new method against existing approximations.
  • To establish a foundation for a global heatwave early warning system.

Main Methods:

  • Implementation of an updated WBGT calculation using ECMWF ERA5 gridded meteorological data.
  • Calculation of globe temperature utilizing mean radiant temperature.
  • Evaluation of the new method against established WBGT approximations using three heatwave case studies.

Main Results:

  • The updated WBGT method demonstrates high accuracy when compared to existing approximations.
  • The new method, utilizing mean radiant temperature for globe temperature, proves reliable.
  • One existing approximation was found to be inadequate for WBGT estimation.

Conclusions:

  • The developed WBGT calculation method provides an accurate and globally applicable solution.
  • This new method is a strong candidate for integration into global forecasting and early warning systems for heat extremes.
  • Improved WBGT assessment can enhance public health and safety during heat events.