Lexi Webster
Australia has been experiencing significant changes in its climate, with the country warming by approximately 1.51°C since national records began in 1910. This warming trend has resulted in an increase in extreme heat events, with Australia's warmest year on record being 2019. The increasing temperatures have led to a rise in heat-related health issues, such as heat stress, and behavioural changes, such as reduced outdoor activities and increased soft drink consumption. Climate change has been identified as a key factor contributing to these heat waves, with human-induced factors playing a significant role. The impact of climate change is evident in the warming of the oceans, rising sea levels, and the increasing frequency and intensity of heatwaves. The changing climate in Australia has far-reaching consequences for the country's ecosystems, infrastructure, and communities, highlighting the importance of understanding the science behind these heat changes.
| Characteristics | Values |
|---|---|
| Average increase in temperature since national records began in 1910 | 1.51 °C |
| Average increase in temperature since 1880 | 1.2 °C |
| Average increase in sea surface temperature since 1900 | 1.08 °C |
| Highest annual average temperature | 40.3 °C (2013) |
| Number of days with extremely high nationally-averaged mean temperatures in 2019 | 40 |
| Number of days when national daily average maximum temperatures exceeded 39 °C in 2019 | 33 |
| Number of days with very high monthly maximum temperatures in 1960-1989 | 2% of the time |
| Number of days with very high monthly maximum temperatures in 2009-2023 | 11% of the time |
| Number of days with very high night-time temperatures in 1960-1989 | 2% of the time |
| Number of days with very high night-time temperatures in 2009-2023 | 10% of the time |
| Number of days with extremely cold nights in parts of south-east and south-west Australia in 1980s | Frequency of frost relatively unchanged |
| Occurrence of very cold days and nights across Australia | Declined |
| Number of heatwaves since 2013 | 2 |
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What You'll Learn
Australia's warming climate
The impact of this warming is evident in the increasing frequency and intensity of heatwaves across Australia. The country has witnessed a rise in ''hot days,", defined by the Bureau of Meteorology as days with maximum temperatures surpassing 35 °C. Notably, the year 2019 stood out as Australia's warmest year on record, and eight of the nine warmest years have occurred since 2013. This trend has continued, with heat records being broken in subsequent years.
The warming climate has brought about shifts in rainfall patterns, leading to drier conditions in the south-west and south-east regions of Australia. The number of heavy short-term rainfall events has increased, and the mean sea level atmospheric pressure over Australia is rising. These changes contribute to the overall warming trend and impact ecosystems and infrastructure.
Sea surface temperatures surrounding Australia have risen by an average of 1.08 °C since 1900, with nine of the ten warmest years occurring since 2010. This warming of the oceans has extended to the Indian Ocean region to the west of Australia and has resulted in longer and more frequent marine heatwaves. The warming ocean waters interact with the atmosphere, influencing the formation of heatwaves and weather patterns.
The consequences of Australia's warming climate are far-reaching, impacting human health, ecosystems, and infrastructure. Heatwaves pose significant health risks, particularly to vulnerable individuals such as the elderly, young children, pregnant women, and people with chronic illnesses. Additionally, the increasing temperatures have led to behavioural changes, with people reducing outdoor activities, increasing soft drink and alcohol consumption, and relying more on air conditioning for relief from the heat.
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The impact of heat on human health
Australia has warmed by an average of 1.51°C since national records began in 1910, with most of the warming occurring since 1950. The country has witnessed an increase in extreme heat events, with the frequency of very hot days in summer rising. Climate change, caused by the trapping of extra heat in the Earth's atmosphere, is a serious threat to human health.
Heat can affect human health in several ways, including direct and indirect impacts. Directly, heat can cause dehydration, heat exhaustion, and heat stroke. It can also worsen health risks for those with chronic conditions, such as cardiovascular, respiratory, and diabetes-related issues. The strain on the body to cool itself stresses the heart and kidneys, which can lead to acute kidney injury. Additionally, hot weather can increase the risk of accidents and reduce work productivity.
Indirectly, heat can alter human behaviour, influence disease transmission, disrupt health service delivery, and impact air quality. It can also affect mental health, particularly for those with pre-existing mental health issues or those on medications that limit the body's natural cooling functions. The scale and nature of health impacts depend on various factors, including the timing, intensity, and duration of the heat event, as well as the level of acclimatization and adaptability of the local population.
To mitigate the impact of heat on human health, individuals should stay out of the sun, stay hydrated, and find places to cool off. Communities need to develop heat action plans, early warning systems, and implement public health initiatives to protect their members. Additionally, addressing climate change by reducing greenhouse gas emissions is crucial to limit the magnitude of human costs from extreme heat.
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The influence of El Niño
Australia has been experiencing significant changes in its climate, with an average warming of 1.51°C since national records began in 1910. This warming has led to an increase in extreme heat events, with hotter daily temperature extremes across the country.
One of the key influences on Australia's climate is the El Niño-Southern Oscillation (ENSO). El Niño is a phase of ENSO that has a significant impact on Australia's weather patterns. During El Niño events, the sea surface temperatures in the central and eastern Pacific Ocean rise, while the western Pacific Ocean cools. This temperature change weakens the easterly trade winds, leading to reduced rainfall over eastern and northern Australia. As a result, El Niño increases the likelihood of hot and dry conditions in Australia, with higher temperatures and less rain.
The effects of El Niño on Australia's climate are profound and far-reaching. El Niño events increase the risk of heatwaves, droughts, and bushfires across the country. The combination of higher temperatures and reduced rainfall can have devastating consequences for Australia's ecosystems, infrastructure, and communities. For example, the 2015-2016 El Niño event contributed to Australia's third-driest spring on record, leading to an early start to the bushfire season with over 125 fires in Victoria and Tasmania.
El Niño events typically occur every 3-7 years and can last from 6 months to 2 years. They usually begin in the Southern Hemisphere autumn and winter, peak in late spring to early summer, and then weaken in the following year's autumn. The frequency and intensity of El Niño events are expected to increase due to global warming, leading to more extreme weather conditions in Australia.
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The science of heatwaves
Australia has warmed by an average of 1.51°C since national records began in 1910, with most of the warming occurring since 1950. Every decade since 1950 has been warmer than the previous decade, and the warming trend shows no signs of slowing down. The country experienced its hottest year on record in 2013, with eight of the nine warmest years on record occurring since then.
The warming in Australia is consistent with global trends, driven by the increased greenhouse effect. The concentration of carbon dioxide in the atmosphere is now around 524 parts per million, the highest in at least 2 million years. This has led to a rise in average global air and ocean temperatures, with the heat content of the oceans increasing by more than 90% since the 1970s.
In Australia, this warming has resulted in more frequent and intense heatwaves. The Bureau of Meteorology defines 'hot days' as those with a maximum temperature higher than 35°C, and heatwaves as 'three or more days where maximum and minimum temperatures are unusually high for a location'. The intensity and frequency of these heatwaves are linked to climate change, and they are now a defining feature of the Australian climate.
The impact of heatwaves on human health and well-being is significant. People often adapt by reducing outdoor activities, increasing soft drink and alcohol consumption, and using more air conditioning. These behavioural changes can have long-term health consequences, particularly for vulnerable individuals such as the elderly, young children, pregnant women, and people with chronic illnesses.
Additionally, extreme heat has caused more deaths in Australia than any other natural hazard, and it also impacts ecosystems and infrastructure. As the planet continues to warm, the deep-seated atmospheric patterns that drive large-scale weather and climate patterns will likely be affected, leading to even more significant changes in Australia's climate.
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The impact of climate change on the ocean
Oceans play a critical role in stabilising the Earth's climate, covering 71% of the planet's surface. They act as a carbon sink, absorbing and storing carbon dioxide as part of the carbon cycle. Oceans have absorbed over 90% of the excess heat caused by climate change and roughly 30% of the carbon dioxide produced by humans since the Industrial Revolution. Without this absorption, global temperatures would have risen even higher.
However, the ocean's ability to absorb carbon dioxide and heat is finite, and the subsequent rise in ocean temperatures, sea levels, and ocean acidification is threatening marine biodiversity and ecosystems. For instance, the warming of surface waters is causing changes in water density and mixing with cooler, deeper water. This has led to a reduction in phytoplankton and zooplankton, which form the base of the ocean food web, and a decline in fish populations.
The warming of oceans has also contributed to longer and more frequent marine heatwaves, particularly off the east coast of Australia in 2023-24. Sea levels are rising due to the expansion of warmer water and the melting of polar ice, resulting in increased flooding, coastal erosion, and damage to coastal infrastructure and communities.
Ocean acidification, a lesser-known consequence of climate change, poses a grave threat to marine life. As carbon dioxide dissolves in seawater, it forms carbonic acid, increasing the water's acidity. This has impacted a wide range of organisms, including corals, algae, molluscs, and plankton, altering fish behaviour and making it harder for some to detect predators.
The delicate balance of marine ecosystems is at risk, with coral reefs, dubbed the 'rainforests of the sea', being particularly vulnerable. Coral reefs are home to over 25% of marine life, and their disruption has knock-on effects on the food and shelter of many species. Warmer waters are leading to an increase in coral bleaching, and it is estimated that 70-90% of coral reefs will disappear with rising global temperatures.
Climate change is causing significant loss of marine biodiversity, including apex predators and keystone species, which disrupts food webs and reduces the resilience of marine ecosystems to environmental change. This has impacted species like whales and sharks, which face reduced food availability and increased difficulty in reproducing, threatening their survival.
The impact of climate change on ocean temperatures has altered the distribution of fish and other species, affecting vulnerable coastal communities that rely on fishing for their livelihoods. It has also exacerbated existing issues such as shoreline erosion, flooding, and water pollution.
Overall, the far-reaching consequences of climate change on the oceans highlight the urgent need to prioritise their health and stability, as they are one of our greatest assets in mitigating the effects of a changing climate.
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Frequently asked questions
Climate change is the main driver of the increase in heat waves in Australia. The planet's warming is caused by an increase in greenhouse gases, which has led to a rise in both air and ocean temperatures.
Australia has warmed by approximately 1.51°C since national records began in 1910, with most of the warming occurring since 1950. Every decade since 1950 has been warmer than the previous one, and the warming trend is expected to continue.
Heatwaves have severe impacts on human health, agriculture, wildlife, and infrastructure in Australia. They have caused more deaths than any other natural hazard, including bushfires and floods. Heatwaves also increase pressure on water and energy supplies, leading to water restrictions and power shortages.
People in Australia are adapting to extreme heat by reducing outdoor activities, increasing their use of air conditioning, and consuming more soft drinks and alcohol. These behaviours can have negative long-term health effects, and there is a need to provide appropriate advice on heat adaptation.
