aridity index

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aridity index

[ə′rid·əd·ē ‚in‚deks]
(climatology)
An index of the degree of water deficiency below water need at any given station; a measure of aridity.
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We know from the study of extremophiles on Earth that life can not only survive, but thrive in conditions that are hyperarid, very saline or otherwise 'extreme' in comparison to what is habitable to a human.
Hamdi-Aissa B, Valles V, Aventurier A, Ribolzi O (2004) Soils and brine geochemistry and mineralogy of hyperarid desert playa, Ouargla Basin, Algerian Sahara.
We discuss the specific environmental conditions that led to the King Valley fire, show that remote-sensing can document effects of fire in a hyperarid environment, and evaluate effects of fire in relation to changes in communities of plants by comparing standard transects in burned and unburned communities.
This can be related to the sudden onset of a warmer and wetter climate in the Early Holocene that enabled the resettling of the Sahara after the hyperarid phase of the last glacial maximum, the 'Ogolien' (Nelson et al.
2007) proposed that supergene copper oxide minerals were later replaced by atacamite following the onset of hyperarid climatic conditions.
Specimens analyzed were from muscle and visceral tissues in excavated, naturally mummified human bodies buried in that hyperarid desert during the past 9 millennia.
This produced the hyperarid climates that rapidly reached their greatest extent and development during the Pleistocene and the Holocene (e.
We suggest that not only tropical hyperarid and hot, or isolated, environments can mold semelparous life histories, but that semelparity also can occur at high-elevation zones in central Mexico (2,800-4,200 m; Rodriguez-Romero et al.
The geological sequences showed that the early MSA was followed by a hyperarid period, representing OIS 4 (Barich et al.
Malesherbiaceae are largely absent from the hyperarid regions of the Atacama Desert (Fig.
Jacobberger's work is part of a larger study exploring the changes in brightness and color of a spectrum of environments: hyperarid Egypt; Mali, which is undergoing active desertification; and Botswana, which has sand dunes stabilized by plants with ample water.
microphylla) is a common member of the zonal vegetation (arbosuffrutescent and crassicaulescent deserts) along with several columnar cacti, whereas in hyperarid and lower-arid areas, it is restricted to rocky places (sarcocaulescent desert) and wet soils (vegetation on drainage ways).