Lyla Lindsey
Australia is currently experiencing severe drought conditions, with record low rainfall and high temperatures. This has prompted discussions about the role of climate change in causing or exacerbating the drought. While there is evidence to suggest that climate change may be a contributing factor, the relationship between climate change and drought is complex and multifaceted.
| Characteristics | Values |
|---|---|
| Date of publication | 19 March 2025 |
| Location of drought | Southern Australia |
| Severity of drought | Severe |
| Contributing factors | Dry and warm autumn, Rainfall variability, Climate change |
| Impact | Agriculture, Tourism, Ecosystems, Water security |
| Metrics used | Rainfall deficiencies, Palmer Drought Severity Index, Standardised Precipitation Evaporation Index |
| Future projections | Declining rainfall, Increased drought frequency and intensity |
| Role of climate change | May exacerbate droughts and increase temperature and evaporation |
| Solutions | Resilience-building, Water strategies, Community awareness |
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What You'll Learn
The complexity of drought metrics
Drought is a complex phenomenon that can be measured in various ways, making it challenging to establish direct links between specific drought events and climate change. While some aspects of drought are influenced by climate change, others are not. This complexity arises from the multitude of factors that contribute to drought conditions.
In Australia, the Bureau of Meteorology typically identifies drought conditions based on rainfall deficiencies. However, droughts are exacerbated by other factors such as low humidity, higher wind speeds, warmer temperatures, and increased sunshine. These factors enhance water loss from soils and plants, underscoring the necessity of considering metrics beyond rainfall alone.
To address this complexity, additional indices are employed, including the Palmer Drought Severity Index and the Standardised Precipitation Evaporation Index. These indices provide a more comprehensive understanding of drought by accounting for factors beyond rainfall. For instance, the Standardised Precipitation Evaporation Index considers the interplay between precipitation and evaporation, which is influenced by temperature, humidity, and wind patterns.
The variability of Australia's climate further complicates drought metrics and projections. The country's diverse regions experience distinct climate patterns, making it challenging to develop uniform drought metrics and predictions. This variability also makes it difficult to isolate the impact of climate change on drought events from natural climate variability.
Moreover, the character of droughts is evolving due to the human-induced warming trend. Climate change not only affects rainfall patterns but also influences evaporation rates, wind patterns, and temperature distributions. These interacting factors give rise to unique drought characteristics that may not be fully captured by existing metrics, underscoring the dynamic and multifaceted nature of drought.
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Climate change and rainfall
Australia is the world's driest permanently inhabited continent, and it has a much more variable climate than many other parts of the world. The country is no stranger to droughts, but the recent dry spell has sparked discussions about the role of climate change.
In southern Australia, there has been a rapid decline in winter rainfall, which has been linked to climate change. The Bureau of Meteorology in Australia uses rainfall deficiencies to identify regions that are under drought conditions. However, other factors such as low humidity, higher wind speeds, warmer temperatures, and greater amounts of sunshine also play a role in exacerbating droughts. These factors increase water loss from soils and plants, leading to more frequent and severe droughts.
The Millennium Drought from 2006 to 2010 in southeast Australia resulted in the lowest 13-year rainfall record since 1865. This prolonged drought, along with other widespread droughts, may have been exacerbated by climate change. Climate change is increasing temperatures and affecting rainfall patterns, evaporation, and climate systems in NSW and other parts of Australia. The combination of these effects is likely making drought conditions worse.
While the connection between climate change and specific droughts is complex and challenging to pin down, scientists agree that climate change intensifies the impacts of droughts. For example, future droughts will be hotter, and the character of droughts may change due to the human-induced warming trend. Additionally, rainfall during the cool season from April to October is trending lower in the southwest and southeast of Australia, affecting farmers who rely on winter crops.
To address the potential impacts of future droughts and climate change, the NSW Government is working with local governments and communities to develop regional water strategies and raise community awareness about reducing water use.
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Climate variability
Australia has a much more variable climate than many other parts of the world. The country is no stranger to drought, but the recent dry spell has sparked discussions about the role of climate change. Prime Minister Malcolm Turnbull commented that farmers need to "build resilience" as rainfall "appears to be getting more variable".
The Bureau of Meteorology in Australia uses rainfall deficiencies to identify regions under drought conditions. However, droughts are also exacerbated by other factors such as low humidity, higher wind speeds, warmer temperatures, and greater amounts of sunshine, which increase water loss from soils and plants. This means that other metrics beyond rainfall are often used to describe droughts, such as the Palmer Drought Severity Index and the Standardised Precipitation Evaporation Index.
There is evidence to suggest that prolonged droughts, like the Millennium Drought from 2006 to 2010, may be worse than droughts in recent centuries and could be exacerbated by climate change. During the Millennium Drought, southeast Australia experienced its lowest 13-year rainfall record since 1865. Climate change is increasing temperatures and affecting rainfall and climate systems, making drought conditions in southeast Australia worse.
While scientists cannot say definitively that a specific drought is caused by climate change, they can state that climate change intensifies the effects of droughts, making them more damaging. Climate models project a continuing decline in rainfall over southern Australia in the next century. Dry conditions are expected to become more frequent, even with low global warming targets associated with the Paris Agreement.
In addition to the environmental impacts, droughts have significant consequences for Australia's industries, economy, and people. The Millennium Drought caused a severe drop in tourism to the Murray River region, resulting in a $70 million loss to the regional tourism industry. Droughts also affect the agriculture industry, leading to damage to farmable land, reduced food production, and job losses.
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The character of droughts is changing
Australia is the world's driest permanently inhabited continent, with 90% of the rain that falls evaporating back into the atmosphere. The country has a long history of droughts, but the character of these droughts is changing, and they are becoming more severe.
There is evidence to suggest that prolonged droughts, like the Millennium Drought from 2006 to 2010, are worse than other droughts in recent centuries and are exacerbated by climate change. Climate change is increasing temperatures and affecting rainfall, evaporation, and climate systems, making drought conditions worse. For example, the Murray-Darling Basin, Australia's food bowl, experienced record-low rainfall and record-high temperatures in 2019, for the third year in a row.
The Bureau of Meteorology identifies drought conditions using rainfall deficiencies, but other metrics, such as the Palmer Drought Severity Index and the Standardised Precipitation Evaporation Index, are also used. These metrics indicate that droughts are becoming more complex and are affected by various factors, including low humidity, higher wind speeds, warmer temperatures, and greater amounts of sunshine, all of which increase water loss from soils and plants.
Climate change is also linked to a rapid decline in winter rainfall in southwestern Australia, and while there has also been a decline in southeastern Australia, it is harder to distinguish from year-to-year variability. Climate models project that dry conditions will become more frequent in southeastern Australia, even with low global warming targets.
The changing character of droughts in Australia has severe impacts on the environment, industries, economy, and people's health and well-being. It threatens iconic species, such as the platypus, and impacts agriculture, tourism, and related industries.
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The impact on industries, economies, and people
Australia is the world's driest inhabited continent, and its industries, economies, and people are heavily impacted by drought. The country has a variable climate, and while it is used to droughts, the recent dry spell has sparked discussions about the role of climate change.
Drought impacts some of Australia's biggest industries, including tourism and agriculture. During the Millennium Drought, tourism to the Murray River region dropped, causing a $70 million loss to the region's tourism industry. Drought also affects agricultural land, reducing food and fibre production, causing job losses, and impacting related industries such as manufacturing and retail.
The agriculture sector is particularly vulnerable to drought, as farmers rely on rainfall to grow crops. With climate change, rainfall patterns are changing, and this impacts the ability to farm effectively. The character of droughts is also changing, with higher temperatures and lower humidity, increasing water loss from soils and plants. This means that even when rain does fall, more of it evaporates back into the atmosphere, and less ends up as runoff, further impacting water supplies.
The impact of drought on industries has a flow-on effect on the economy. Job losses in agriculture, for example, impact local economies and communities. The Australian government has also had to invest in strategies to secure water for the future, which comes at a cost.
Finally, drought impacts people's lives directly, including their physical and mental health. This is particularly true in rural and agricultural communities, where people's livelihoods are directly impacted by the weather.
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Frequently asked questions
Australia is currently experiencing severe drought conditions, particularly in the southern half of the continent, after a very dry and warm autumn.
The drought has impacted Australia's environment, industries, economy, and people. It has caused damage to farmable land, reduced food and fibre production, and resulted in job losses. It has also affected physical and mental health, and threatened iconic species such as the platypus and important ecosystems like eucalyptus forests.
The answer is complicated. Climate change may be exacerbating the drought, but it is challenging to discern its exact role due to Australia's variable climate. Some aspects of drought are linked to climate change, while others are not. Climate change is increasing temperatures and affecting rainfall patterns, which can worsen drought conditions. However, the specific connection between climate change and individual drought events is complex and depends on various metrics and factors.
