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Wet-bulb globe temperature index estimation using meteorological data from São Paulo State, Brazil
Paulo Alves Maia1, Álvaro Cézar Ruas1, Daniel Pires Bitencourt2
1Fundacentro, Florianopolis, SC, Brazil.
International Journal of Biometeorology
|January 31, 2015
Summary
This study introduces a new method to estimate the wet-bulb globe temperature (WBGT) index using data from automatic weather stations. This approach accurately monitors heat stress in large outdoor work areas, like agricultural settings, improving worker safety.
Area of Science:
- Environmental Science
- Occupational Health
- Meteorology
Background:
- Excessive heat exposure poses significant health risks, including heat disorders and mortality.
- The wet-bulb globe temperature (WBGT) index is crucial for evaluating heat stress in workers but direct measurement is challenging in large outdoor areas.
- Current methods for WBGT assessment are often impractical for extensive agricultural work environments.
Purpose of the Study:
- To develop and validate an estimation method for the WBGT index using readily available atmospheric variables from automatic meteorological stations.
- To provide a feasible solution for monitoring heat stress in large-scale outdoor work environments, particularly in agriculture.
- To enhance the real-time monitoring and investigation of heat-related disorders.
Main Methods:
- Utilized atmospheric data from automatic meteorological stations in São Paulo, Brazil, as a test-bed.
- Developed an algorithm to estimate WBGT, incorporating a cloudiness factor derived from solar radiation measurements.
- Validated the estimation method against direct WBGT measurements, considering data from stations within an 80 km range.
Main Results:
- The proposed WBGT estimation method, incorporating cloudiness, demonstrated high efficiency comparable to direct measurement techniques.
- Estimated WBGT values derived from meteorological station data were found to be reliable for stations located less than 80 km apart.
- The method proved viable for real-time heat stress monitoring and retrospective analysis of heat-related issues.
Conclusions:
- The estimation of WBGT using atmospheric data from meteorological stations is a viable and efficient approach for assessing heat stress.
- This method offers a practical solution for monitoring heat exposure in large outdoor work areas, especially in agriculture.
- The findings support the use of this estimation technique for improving occupational safety and understanding heat-related health impacts in affected populations.
