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Recent climate events such as extremely high temperatures and widespread drought have focused government and public attention on the effects of climate change in Australia. [153] Rainfall in southwestern Australia has decreased by 10–20% since the 1970s, while southeastern Australia has also experienced a moderate decline since the 1990s. [150]
Amongst OECD nations Australia is ranked fourth-highest in water use per capita. [5] Total water runoff in 2004–05 was estimated at 243 billion cubic meters (BCM) and total groundwater recharge was estimated at 49 BCM, giving a total inflow to Australia's water resources of 292 BCM. Over 50 per cent of runoff occurred in northern Australia.
Rainfall is expected to become heavier and more infrequent, as well as more common in summer rather than in winter. Australia's annual average temperatures are projected to increase 0.4–2.0 °C above 1990 levels by the year 2030, and 1–6 °C by 2070.
March Rainfall was 74% above average for NSW, and 35% above average for Victoria however overall rain was 27% below average for Australia. A large number of sites in NSW recorded their wettest March on record, in Greater Sydney, Illawarra, Northern Rivers and the Mid North Coast saw numerous daily records and monthly records broken.
The current is mainly seasonal, being weaker in winter and stronger in summer, and is affected by the winds in that area. [2] [3] [4]In addition to the West Australian Current flowing on the Western Australian Coast, the Leeuwin Current [5] and Southern Australian Countercurrent, also flow along this coast, with the former flowing in the opposite direction.
The Australian monsoon (AUM), also known as the Australian summer monsoon (ASM), [2] and the Australian-Indonesian monsoon (AIM), [3] is a monsoon system that increases thunderstorms and rainfall over many areas of Indonesia and northern Australia, from the far northern tropics of the region to the semi-arid zone of Australia, typically between ...
Rainfall is expected to become heavier and more infrequent, as well as more common in summer rather than in winter. Australia's annual average temperatures are projected to increase 0.4–2.0 °C above 1990 levels by the year 2030, and 1–6 °C by 2070.
Recent climate events such as extremely high temperatures and widespread drought have focused government and public attention on the effects of climate change in Australia. [8] Rainfall in southwestern Australia has decreased by 10–20% since the 1970s, while southeastern Australia has also experienced a moderate decline since the 1990s. [5]