Heat stress during the Black Saturday event in Melbourne, Australia

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• 作者：Stephanie J. Jacobs ; Timo Vihma…
• 关键词：Black Saturday ; Heat stress ; Thermal comfort ; Air pollution ; Human energy budget ; Apparent temperature ; COMFA
• 刊名：International Journal of Biometeorology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：59
• 期：6
• 页码：759-770
• 全文大小：1,171 KB
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• 作者单位：Stephanie J. Jacobs (1)
  Timo Vihma (2)
  Alexandre B. Pezza (3)
  
  1. School of Earth, Atmosphere and Environment, CRC for Water Sensitive Cities, Monash University, Melbourne, Victoria, 3800, Australia
  2. Finnish Meteorological Institute, Helsinki, Finland
  3. University of Melbourne, Melbourne, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Animal Physiology
  Plant Physiology
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1254

文摘

The Black Saturday bushfire event of February 7, 2009, devastated the state of Victoria, Australia, resulting in 173 deaths. On this day, the maximum temperature in Melbourne (state capital of Victoria, population 4 million people) exceeded 46?°C, there were wind gusts of over 80?km?h? and the relative humidity dropped below 5?%. We investigated the severe meteorological conditions of Black Saturday and the risk of heat stress and dehydration for the residents of Melbourne. This was through the analysis of weather station data, air pollution data, the apparent temperature (AT) and the COMfort FormulA human energy budget model. A very strong pressure gradient caused hot and dry air to be advected to Melbourne from the desert interior of Australia creating the extreme weather conditions. The AT showed that on Black Saturday, heat stress conditions were present, though underrepresented due to assumptions in the AT formula. Further investigation into the human energy budget revealed that the conditions required a sweating rate of 1.4?kg?h? to prevent heat accumulation into the body. If sweating stopped, hyperthermia could occur in 15?min. Sensitivity tests indicated that the dry air and strong winds on Black Saturday helped to release latent heat, but the required sweating rate was virtually unattainable for an average person and would result in intense dehydration. Air particulates were at dangerous concentrations in Melbourne on Black Saturday, further intensifying the stresses to the human body. In the future, we recommend that the AT is not used as a thermal comfort measure as it underestimates the physical stress people experience.