The danger of heat and cold across Australia

climate
Credit: CC0 Public Domain

Cold temperatures are not nearly as deadly as heat, with around 2% of all deaths in Australia related to heat, according to new research from the University of Technology Sydney.

The study, published today in the journal Climatic Change, reveals that in warmer regions of Australia up to 9% of deaths were related to heat, with the elderly facing the greatest risk.

Cold weather had a much smaller impact (-0.4% nationwide) except in the coldest zone, where 3.6% of deaths could be linked to cold temperatures.

"Accurately measuring temperature-related is an important step towards understanding the , particularly across different climate zones," says study author Dr. Thomas Longden, from the UTS Centre for Health Economics Research and Evaluation.

The study is the first to use a national data set of mortality records to calculate the number of deaths linked to heat and cold in Australia. A key part of the analysis was estimating temperature-related deaths across six climate zones.

The climate zones range from areas with hot, humid summers in Northern Australia, to areas with mild summers and cold winters in Tasmania, ACT and parts of NSW and Victoria.

Regions with warm, humid summers, including Brisbane, Coffs Harbour and the Gold Coast, had the highest proportion of deaths linked to heat (9.1%).

The coldest climate zone, which encompasses Tasmania and the NSW and Victorian alpine regions, saw 3.6% of deaths attributed to and a 3.3% reduction in deaths during warmer months.

The study also revealed that in some regions, particularly those with warm, humid summers, colder temperatures actually reduced deaths in comparison to the median temperature.

"While the cold is more dangerous in the colder climate zones, in four of the six regions, there was a decrease in deaths during colder weather. This is because most of the cold days in warmer climate zones are quite moderate," says Dr. Longden.

Previous studies that used data for Sydney, Melbourne and Brisbane have suggested that despite increasing temperatures due to climate change, there would be a net reduction in temperature-related deaths due to the reduction in cold-related deaths.

However, this study reveals that nationwide there would be a net cost from climate change, as increased heat-related deaths would not be offset by a reduction in cold-related deaths in most climate zones.

"Whether an increase in heat-related mortality is offset by a reduction in cold-related mortality is crucial to finding a net benefit or cost from climate change when using temperature-mortality relationships," Dr. Longden says.

"The main differences between the earlier studies and this one is the use of a national mortality data set, which allows for the analysis of differences between climate zones, and the reference used to measure the relative risk of mortality," says Dr. Longden.


Explore further

Deaths from cardiovascular diseases attributable to heat and cold down 38% in Spain

More information: Thomas Longden, The impact of temperature on mortality across different climate zones, Climatic Change (2019). DOI: 10.1007/s10584-019-02519-1
Journal information: Climatic Change

Citation: The danger of heat and cold across Australia (2019, September 10) retrieved 19 September 2019 from https://phys.org/news/2019-09-danger-cold-australia.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
13 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more