: Paleoclimatology: arid environment

natural environment > arid environment

arid environment

Arid environments encompass more than 35% of the world’s land area, nearly 60 million square kilometers, and represent the most common habitat on Earth after oceans (Mares, 1999). According to the United Nations Environmental Programme, arid environments can be categorized by their Aridity Index (AI), defined as the ratio between the mean annual precipitation and the mean annual evapotranspiration (Barrow, 1992). Arid deserts (AI < 0.2) experienced low and irregular precipitation events, around 250 mm annually. However, more extreme regions—the so-called hyperarid deserts—experienced an annual mean precipitation below 25 mm (AI < 0.05). A number of hot and cold deserts around the world fits these later characteristics and are also considered analog environments for Mars (Friedmann, 1986; Domagal-Goldman et al., 2016) (Adapted from: https://www.sciencedirect.com/topics/earth-and-planetary-sciences/arid-environment)

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