Australia
In Australia, areas around the Tropic have some of the world's most variable rainfall.[4] In the east advanced plants such as flowering shrubs and eucalyptus and in most bioregions grasses have adapted to cope with means such as deep roots and little transpiration. Wetter areas, seasonally watered, are widely pasture farmed. As to animals, birds and marsupials are well-adapted. Naturally difficult arable agriculture specialises in dry fruits, nuts and modest water consumption produce. Other types are possible given reliable irrigation sources and, ideally, water-retentive enriched or alluvial soils, especially wheat; shallow irrigation sources very widely dry up in and after drought years. The multi-ridge Great Dividing Range brings relief precipitation enough to make hundreds of kilometres either side cultivable, and its rivers are widely dammed to store necessary water; this benefits the settled areas of New South Wales and Queensland.
Behind the end of the green hills, away from the Pacific, which is subject to warm, negative phases of the El Niño–Southern Oscillation (colloquially this is an "El Niño year/season") is a white, red and yellow landscape of 2,800 to 3,300 kilometres of rain shadow heading west in turn feature normally arid cattlelands of the Channel Country, the white Kati Thanda-Lake Eyre National Park, the mainly red Mamungari Conservation Park, then the Gibson Desert, after others the dry landscape settlement of Kalbarri on the west coast and its rest, northward. The Channel Country features an arid landscape with a series of ancient flood plains from rivers which only flow intermittently. The principal rivers are Georgina River, Cooper Creek and the Diamantina River. When there is sufficient rainfall in their catchment area these rivers flow into Lake Eyre, South Australia. In most years the flood waters are absorbed into the earth or evaporate, however. One of the most significant rainfall events occurred in 2010 when a monsoonal low from ex-Cyclone Olga created a period of exceptional rainfall.[5]
El Niño adverse phases cause a shift in atmospheric circulation; rainfall becomes reduced over Indonesia and Australia, rainfall and tropical cyclone formation increases over the tropical Pacific.[6] The low-level surface trade winds, which normally blow from east to west along the equator, either weaken or start blowing from the other direction.[6]
Tropic of Capricorn as it runs through Australia in the 1794 Dunn Map of the World
Road sign marking Tropic of Capricorn in Western Australia
Monument marking the Tropic of Capricorn just north of Alice Springs, Northern Territory
Tropic of Capricorn on the Diamantina Developmental Road, Amaroo, Queensland
Roadside monument marking Tropic of Capricorn in Rochhampton, Queensland
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