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Tropical Zone Expanding, Temperate Regions Shrinking
The authors of the review concluded that the effects of a poleward expansion of the tropical and subtropical zones were immense, resulting in a variety of social, political, economic and environmental implications.
Conducted by Dr Joanne Isaac, Post-Doctoral Fellow at JCUs Centre for Tropical Biodiversity and Climate Change, with Professor Steve Turton, from JCUs School of Earth and Environment Sciences, the review looked at scientific findings from long-term satellite measurements, weather balloon data, climate models and sea surface temperature studies.
Professor Turton said that the review - Expansion of the Tropics: Evidence and Implications - encompassed about 70 peer-reviewed scientific papers and reports from scientists and institutions right around the world.
The review found that of particular concern were regions which border the subtropics and currently experience a temperate Mediterranean climate.
Such areas include heavily populated regions of southern Australia, southern Africa, the southern Europe-Mediterranean-Middle East region, the south-western United States, northern Mexico, and southern South America all of which are predicted to experience severe drying.
If the dry subtropics expand into these regions, the consequences could be devastating for water resources, natural ecosystems and agriculture, with potentially cascading environmental, social and health implications.
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