Sierra Nevada

Sierra Nevada

Sierra Nevada, chief mountain range of S Spain, in Granada prov., running from east to west for c.60 mi (100 km), parallel to the Mediterranean Sea. The range's highest peak is Mulhacén (11,411 ft/3,478 m). The range, which contains Spain's largest national park, is popular with skiers.
Sierra Nevada, mountain range, c.400 mi (640 km) long and from c.40 to 80 mi (60-130 km) wide, mostly in E Calif. It rises to 14,495 ft (4,418 m) in Mt. Whitney, the highest peak in the United States outside Alaska. The mountains extend NW from Tehachapi Pass near Bakersfield, Calif., to the gap S of Lassen Peak. A tilted fault-block in structure (the largest in the United States), the Sierra Nevada's eastern front rises sharply from the Great Basin, while its western slope descends gradually to the hills bordering the Central Valley of California. Heavy winter precipitation is economically important to the surrounding areas; snow-fed streams supply irrigation water to the Central Valley and to W Nevada and also generate hydroelectric power. High, rugged, and frequently snowbound in winter, the mountains are a formidable barrier to overland travel. Donner Pass (alt. 7,089 ft/2,161 m), the principal pass across the mountains, was used by thousands of California-bound gold-seekers and immigrants in the middle and late 1800s. The Sierra Nevada are known for their magnificent scenery (especially in the High Sierra S of Lake Tahoe and in Yosemite, Sequoia, and Kings Canyon national parks) and for their year-round resorts.

Mountain range, eastern California, U.S. The Sierra Nevada range extends more than 250 mi (400 km) from the Mojave Desert to the Cascade Range, and it averages about 50 mi (80 km) in width. The peaks of the range are 11,000–14,000 ft (3,350–4,270 m) high; Mount Whitney is the highest mountain. It is a year-round recreation centre and is easily accessed from the state's large urban areas.

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The Sierra Nevada (Spanish for "Snowy Range") is a mountain range located in the U.S. state of California. In a few places, it overlaps into neighboring Nevada. The range is also known informally as the Sierra, the High Sierra, and the Sierras.

Geography

The Sierra Nevada stretches 400 miles (650 km), from Fredonyer Pass in the north to Tehachapi Pass in the south. It is bounded on the west by California's Central Valley, and on the east by the Great Basin.

Physiographically, it is a section of the Cascade-Sierra Mountains province, which in turn is part of the larger Pacific Mountain System physiographic division.

In west-east cross section, the Sierra is shaped like a trapdoor: the elevation gradually increases on the west slope, while the east slope forms a steep escarpment. Thus, the crest runs principally along the eastern edge of the Sierra Nevada range. Rivers flowing west from the Sierra Crest eventually drain into the Pacific Ocean, while rivers draining east flow into the Great Basin and do not reach any ocean. However, water from several streams and the Owens River is redirected to the city of Los Angeles (see Los Angeles Aqueduct). Thus, by artificial means, some east-flowing river water does make it to the Pacific Ocean.

There are several notable geographical features in the Sierra Nevada:

The height of the mountains in the Sierra Nevada gradually increases from north to south. Between Fredonyer Pass and Lake Tahoe, the peaks range from 5,000 feet (1,524 m) to 8,000 feet (2,438 m). The crest near Lake Tahoe is roughly 9,000 feet (2,700 m) high, with several peaks approaching the height of Freel Peak (10,881 feet, 3,316 m), including Mount Rose (10,776 feet, 3,285 m), which overlooks Reno from the north end of the Carson Range. The crest near Yosemite National Park is roughly 13,000 feet (4,000 m) high at Mount Dana and Mount Lyell, and the entire range attains its peak at Mount Whitney (14,505 feet, 4,421 m). South of Mount Whitney, the range diminishes in elevation, but there are still several high points like Florence Peak (12,405 feet, 3,781 m) and Olancha Peak (12,123 feet, 3,695 m). The range still climbs almost to 10,000 feet (3,048 m) near Lake Isabella, but south of the lake, the peaks reach only to a modest 8,000 feet (2,438 m).

Geology

See Geology of the Yosemite area for a detailed article about the geology of the central Sierra Nevada.

The well-known granite that makes up most of the southern Sierra started to form in the Triassic period. At that time, an island arc collided with the West coast of North America and raised a set of mountains, in an event called the Nevadan orogeny. This event produced metamorphic rock. At roughly the same time, a subduction zone started to form at the edge of the continent. This means that an oceanic plate started to dive beneath the North American plate. Magma from the melting oceanic plate rose in plumes (plutons) deep underground, their combined mass forming what is called the Sierra Nevada batholith. These plutons formed at various times, from 115 million to 87 million years ago. By 65 million years ago, the proto-Sierra Nevada was worn down to a range of rolling low mountains, a few thousand feet high.

Twenty million years ago, crustal extension associated with the Basin and Range Province caused extensive volcanism in the Sierra. About 4 million years ago, the Sierra Nevada started to form and tilt to the west. Rivers started cutting deep canyons on both sides of the range. The Earth's climate cooled, and ice ages started about 2.5 million years ago. Glaciers carved out characteristic U-shaped canyons throughout the Sierra. The combination of river and glacier erosion exposed the uppermost portions of the plutons emplaced millions of years before, leaving only a remnant of metamorphic rock on top of some Sierra peaks.

Uplift of the Sierra Nevada continues today, especially along its eastern side. This uplift causes large earthquakes, such as the Lone Pine earthquake of 1872.

Ecology

The Sierra Nevada is divided into a number of biotic zones

History

The earliest identified inhabitants of the Sierra Nevada were the Paiute tribe on the east side and the Mono and Sierra Miwok tribe on the western side. Today, passes such as Duck Pass are littered with discarded obsidian arrowheads that date back to trade between tribes. There were also prehistorical territorial disputes between the Paiute and Sierra Miwok tribes Archaeological excavations placed Martis people in northcentral Sierra Nevada during the period of 3,000 BC to 500 AD. Washo and Maidu were also in this area prior to the exploration era.

History of exploration

European-American exploration of the mountain range started in the 1840s. In the winter of 1844, Lieutenant John C. Frémont, accompanied by Kit Carson, was the first white man to see Lake Tahoe.

By 1860, even though the California Gold Rush populated the flanks of the Sierra Nevada, most of the Sierra remained unexplored. Therefore, the state legislature authorized the California Geological Survey to officially explore the Sierra (and survey the rest of the state). Josiah Whitney was appointed to head the survey.

Men of the survey, including William H. Brewer, Charles F. Hoffmann, and Clarence King, explored the backcountry of what would become Yosemite National Park in 1863. In 1864, they explored the area around Kings Canyon. King later recounted his adventures over the Kings-Kern divide in his book Mountaineering in the Sierra Nevada. In 1871, King mistakenly thought that Mount Langley was the highest peak in the Sierra and climbed it. However, before he could climb the true highest peak (Mount Whitney), fishermen from Lone Pine climbed it and left a note.

Between 1892 and 1897, Theodore Solomons was the first explorer to attempt to map a route along the crest of the Sierra (what would eventually become the John Muir Trail, along a different route). On his 1894 expedition, he took along Leigh Bierce, son of writer Ambrose Bierce.

Other noted early mountaineers included:

Features in the Sierra are named after these men.

Etymology

In 1542 Juan Rodriguez Cabrillo, sighting the Santa Cruz Mountains while off the peninsula of San Francisco, gave them the name Sierra Nevada meaning "snowy range" in Spanish. As more specific names were given to California's coastal ranges, the name was used in a general way to designate less familiar ranges towards the interior. In April of 1776 Padre Pedro Font on the second de Anza expedition, looking northeast across the Tulare Lake, described the mountains seen beyond:
Looking northeast we saw an immense plain without any trees, through which the water extends for a long distance, having in it several little islands of lowland. And finally, on the other side of the immense plain, and at a distance of about forty leagues, we saw a great Sierra Nevada whose trend appeared to me to be from south-southeast to north-northwest.

Its most common nickname is the Range of Light. This nickname comes from John Muir, which is a description of the unusually light colored granite exposed by glacial action.

Climate and meteorology

During the fall, winter, and spring, precipitation in the Sierra ranges from where it occurs mostly as snow above . Rain on snow is common. Summers are dry with low humidity, however afternoon thunderstorms are not uncommon. Summer temperature averages 42 to 60 degrees Fahrenheit (5.5 to 15.5 degrees Celsius). The growing season lasts 20 to 230 days, strongly dependent on elevation.

A unique peculiarity of the Sierra Nevada is that, under certain wind conditions, a large round tube of air begins to roll on the southeast side. This is known as the "Sierra Nevada Rotor" or a "Sierra Wave. This "mountain wave" forms when dry continental winds from the east cause the formation of a stacked set of counter-revolving cylinders of air reaching into the stratosphere. As of 2004, no sailplane has found its top. Similar features occur on many mountain ranges, but it is often observed and utilized in the Sierra. The phenomenon was the subject of an Air Force-funded study in the early 1950s called the Sierra Wave Project. Many recent world altitude records set in unpowered aircraft were set in the Sierra Nevada Wave, most flown from Mojave Airport.

The Sierra Nevada casts the valleys east of the Sierra in a rain shadow, which makes Death Valley and Owens Valley "the land of little rain".

Protected Status

In much of the Sierra Nevada, development is restricted or highly regulated. A complex system of National Forests, National Parks, Wilderness Areas and Zoological Areas designates permitted land uses within the stretch of the Sierra. These areas are jointly administered by the U.S. Forest Service, the Bureau of Land Management, and the National Park Service. See List of Sierra Nevada topics for a list of protected areas.

See also

References

External links

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