[57], When rain falls in deserts, as it occasionally does, it is often with great violence. A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. They usually receive precipitation from 250 mm (10 in) to 500 mm (20 in) but this can vary due to evapotranspiration and soil nutrition. [49], Sand dunes are accumulations of windblown sand piled up in mounds or ridges. Kangaroos keep cool by increasing their respiration rate, panting, sweating and moistening the skin of their forelegs with saliva.

], The Santa Ana winds are commonly portrayed in fiction as being responsible for a tense, uneasy, wrathful mood among Angelenos. It does rain in the desert, but not often. These also occur parallel to a strong wind that blows in one general direction. [1] The correlation between aridity and sparse population is complex and dynamic, varying by culture, era, and technologies; thus the use of the word desert can cause confusion. They occur in regions where large temperature differences occur between sea and land. A semi-arid desert or a steppe is a version of the arid desert with much more rainfall, vegetation and higher humidity.

[13], Although the winds often have a destructive nature, they have some benefits as well. In common usage, cold is often a subjective perception.A lower bound to temperature is absolute zero, defined as 0.00 K on the Kelvin scale, an absolute thermodynamic temperature scale.

The cream-colored courser flits gracefully across the ground on its long legs, stopping periodically to snatch up insects. [21] Trade wind deserts occur either side of the horse latitudes at 30° to 35° North and South. The maid sulks. [6] Semi-deserts are regions which receive between 250 and 500 mm (10 and 20 in) and when clad in grass, these are known as steppes.

[96] The long-legged darkling beetle in Namibia stands on its front legs and raises its carapace to catch the morning mist as condensate, funnelling the water into its mouth. They are mostly in areas remote from the sea where most of the moisture has already precipitated from the prevailing winds. [38] In a study of a dust storm in China in 2001, it was estimated that 6.5 million tons of dust were involved, covering an area of 134,000,000 km2 (52,000,000 sq mi). [2] Phrases such as "desert island"[3] and "Great American Desert", or Shakespeare's "deserts of Bohemia" (The Winter's Tale) in previous centuries did not necessarily imply sand or aridity; their focus was the sparse population. [19] Like arid deserts, temperatures can vary greatly in semi deserts. University of California, Los Angeles, Meteorology Dept.

When they reach the crest, they cascade down the far side. This article is about the seasonal strong winds in Southern California. When it has passed through the gut of a pronghorn it germinates readily, and the little pile of moist dung provides an excellent start to life well away from the parent tree. Biosphere reserves are the areas of terrestrial and coastal ecosystems which promote the conservation of biodiversity with its sustainable use. When the Los Angeles Basin was primarily an agricultural region, the winds were feared particularly by farmers for their potential to destroy crops.[2].

On nights like that every booze party ends in a fight. The National Weather Service defines Santa Ana winds as "Strong down slope winds that blow through the mountain passes in southern California. Also sometimes called "devil winds",[2][3] the Santa Anas are infamous for fanning regional wildfires. The combination of wind, heat, and dryness accompanying the Santa Ana winds turns the chaparral into explosive fuel feeding the infamous wildfires for which the region is known. [26] Serious complications include severe pneumonia, lung nodules, and disseminated disease, where the fungus spreads throughout the body. [citation needed].

These larger particles anchor the other particles in place and may also be packed together on the surface so as to form a miniature desert pavement. The Santa Ana winds were also a factor in the November 2008 California wildfires. [36], Sand and dust storms are natural events that occur in arid regions where the land is not protected by a covering of vegetation. [30] During the day the sky is usually clear and most of the sun's radiation reaches the ground, but as soon as the sun sets, the desert cools quickly by radiating heat into space. They occur in the Arctic, the Antarctic and Greenland, as well as above the tree lines of mountain ranges.

[54] The Tassili Plateau in Algeria is an impressive jumble of eroded sandstone outcrops, canyons, blocks, pinnacles, fissures, slabs and ravines. When Santa Ana conditions prevail, with winds in the lower two to three kilometers (1.25-1.8 miles) of the atmosphere from the north through east, the air over the coastal basin is extremely dry, and this dry air extends out over offshore waters of the Pacific Ocean. A desert is an arid (very dry) biome.

[86] Carnivores can obtain much of their water needs from the body fluids of their prey. Warfare in the desert offered great scope for tacticians to use the large open spaces without the distractions of casualties among civilian populations. The increased temperature on the cold deserts makes the water level also increase. Cold deserts often have high concentrations of salt in the soil. Wadis, stream channels that are normally dry, can quickly fill after heavy rain, causing a flash flood. The cold deserts of India are located adjacent to the Himalaya Mountains. Ground water may be drawn to the surface by evaporation and the formation of salt crystals may dislodge rock particles as sand or disintegrate rocks by exfoliation. They may survive by growing roots that are very near the surface to absorb the rain that may fall before it evaporates. The disseminated form of Coccidioidomycosis can devastate the body, causing skin ulcers, abscesses, bone lesions, severe joint pain, heart inflammation, urinary tract problems, meningitis, and often death. [24] They used terracing techniques and grew gardens beside seeps, in moist areas at the foot of dunes, near streams providing flood irrigation and in areas irrigated by extensive specially built canals. Evidence suggests that the Atacama may not have had any significant rainfall from 1570 to 1971.

There are not many animals in the desert, but some animals are able to survive.

In December 2017, a cluster of twenty-five Southern California wildfires were exacerbated by long-lasting and strong Santa Ana winds. Cold Desert has an area of 7,770 square kilometres (1,920,000 acres). Other water from the river is piped to urban communities but all this has been at the expense of the river, which below the extraction sites no longer has any above-ground flow during most of the year. Examples of animals that live in hot deserts are lizards, small rodents, snakes, and camels.

These can experience flash floods, becoming raging torrents with surprising rapidity after a storm that may be many kilometers away. Problems they need to solve include how to obtain enough water, how to avoid being eaten and how to reproduce. [88] Mammals living in cold deserts have developed greater insulation through warmer body fur and insulating layers of fat beneath the skin. Winter temperatures vary considerably between different deserts and are often related to the location of the desert on the continental landmass and the latitude.

They originate from cool, dry high-pressure air masses in the Great Basin. Reptiles cannot survive at this temperature and lizards will be prostrated by heat at 45 °C (113 °F). [122], Many centuries later, both world wars saw fighting in the desert. [118] Large swaths of this desert are covered in mirrors.

I rekindle a waning argument with the telephone company, then cut my losses and lie down, given over to whatever is in the air.



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