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Pampas

"Pampa" redirects here. For other uses, see Pampa (disambiguation) and Pampas (disambiguation).
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Pampas
Natural region
Landscape in the Pampas at eye level
Landscape in the Pampas at eye level
Approximate location and borders of the Pampas encompassing the southeastern area of South America bordering the Atlantic Ocean
Approximate location and borders of the Pampas encompassing the southeastern area of South America bordering the Atlantic Ocean
Countries Argentina, Uruguay and Brazil
Elevation 160 m (520 ft)

The Pampas (from Quechua pampa, meaning "plain"[1]) are fertile South American lowlands, covering more than Script error: No such module "convert"., that include the Argentine provinces of Buenos Aires, La Pampa, Santa Fe, Entre Ríos and Córdoba; most of Uruguay; and the southernmost Brazilian State, Rio Grande do Sul. These vast plains are a natural region only interrupted by the low Ventana and Tandil hills near Bahía Blanca and Tandil (Argentina), with a height of Script error: No such module "convert". and Script error: No such module "convert". respectively.

The climate is mild, with precipitation of Script error: No such module "convert". to Script error: No such module "convert"., more or less evenly distributed through the year, making the soils appropriate for agriculture. This area is also one of the distinct physiography provinces of the larger Paraná-Paraguay Plain division. These plains contain unique wildlife because of the different terrains around it. Some of this wildlife includes the rhea, the pampas deer, several species of armadillos, the pampas fox, the White-eared opossum, the Elegant Crested Tinamou, and several other species.

Climate

File:Pasillo de los tornads de América del Sur.jpg
The Pampas "Tornado Alley" of South America. The gray zone denotes high risk, red zone denotes medium risk.

The climate of the Pampas is generally temperate, gradually giving way to a more subtropical climate in the north, and to a semi-arid climate on the western fringes (e.g. San Luis Province and western La Pampa Province). Summer temperatures are more uniform than winter temperatures, generally ranging from Script error: No such module "convert". during the day. However, most cities in the Pampas occasionally have high temperatures that push Script error: No such module "convert".. This occurs when a warm, dry northerly wind blows from southern Brazil. Autumn arrives gradually in March, and peaks in April and May. In April, highs will range from Script error: No such module "convert". and lows from Script error: No such module "convert".. The first frosts arrive in mid-April in the south, and in late May or early June in the north.

Winters are generally mild, although cold waves do occur. Normal temperatures range from Script error: No such module "convert". during the day, and from Script error: No such module "convert". at night. With strong northerly winds, days of over Script error: No such module "convert". can be recorded almost everywhere, whereas during cold waves, high temperatures can be only Script error: No such module "convert".. Frost occurs everywhere in the Pampas, although it is much more frequent in the southwest, and less so around the Parana and Uruguay rivers. Temperatures under Script error: No such module "convert". can occur everywhere, whereas values of Script error: No such module "convert". or lower are confined to the south and west. Snow never falls in the northernmost third, and is rare and light elsewhere, except for exceptional events where depths have reached Script error: No such module "convert"..

Springs are very variable, it is warmer than fall in most areas (especially in the west) but significantly colder along the Atlantic. Violent storms are more common, as well as wide temperature variations: days of Script error: No such module "convert". can give way to nights of under Script error: No such module "convert". or even frost, all within only a few days.

Precipitation ranges from Script error: No such module "convert". in the northeast, to about Script error: No such module "convert". in the southern and western edges. In the west, it is highly seasonal, with some places recording averages of Script error: No such module "convert". monthly in the summer, and only Script error: No such module "convert". monthly in the winter. The eastern areas have small peaks in the fall and in the spring, with relatively rainy summers and winters that are only slightly drier. However, where summer rain falls as short, heavy storms, winter rain falls mostly as cold drizzle, so that the amount of rainy days is fairly constant. Very intense thunderstorms are common in the spring and summer, and it has among the most frequent lightning and highest convective cloud tops in the world.[2][3] The severe thunderstorms produce intense hailstorms, and both floods and flash floods, as well as the most consistently active tornado region outside the central and southeastern US.[4]

Vegetation

Frequent wildfires ensure that only small plants such as grasses flourish, and trees are rare. The dominant vegetation types are grassy prairie and grass steppe in which numerous species of the grass genus Stipa are particularly conspicuous. "Pampas Grass" (Cortaderia selloana) is an iconic species of the Pampas. Vegetation typically includes perennial grasses and herbs. Different strata of grasses occur because of gradients of water availability.

The World Wildlife Fund divides the Pampas into three distinct ecoregions. The Uruguayan Savanna lies east of the Parana River, and includes all of Uruguay, most of Entre Ríos and Corrientes provinces in Argentina, and the southern portion of Brazil's state of Rio Grande do Sul. The Humid Pampas include eastern Buenos Aires Province, and southern Entre Ríos Province. The Semi-arid Pampas includes western Buenos Aires Province and adjacent portions of Santa Fe, Córdoba, and La Pampa provinces. The Pampas are bounded by the drier Argentine espinal grasslands, which form a semicircle around the north, west, and south of the Humid Pampas.

Winters are cool to mild and summers are very warm and humid. Rainfall is fairly uniform throughout the year but is a little heavier during the summer. Annual rainfall is heaviest near the coast and decreases gradually further inland. Rain during the late spring and summer usually arrives in the form of brief heavy showers and thunderstorms. More general rainfall occurs the remainder of the year as cold fronts and storm systems move through. Although cold spells during the winter often send nighttime temperatures below freezing, snow is quite rare. In most winters, a few light snowfalls occur over inland areas.

Central Argentina boasts a successful agricultural business, with crops grown on the Pampas south and west of Buenos Aires. Much of the area is also used for cattle and more recently to grow vineyards in the Buenos Aires wine region. These farming regions are particularly susceptible to flooding during the thunderstorms. In the Pampas the weather averages out to be Script error: No such module "convert". round year.

File:Autódromo Eusebio Marcilla.jpg
View of the northern Pampas grain belt
File:Laguna de Gomez.jpg
Lake Gómez, near Junín, in the heart of the Pampas grain belt. The Pampa extends from the foothills of the Andes Mountains on the west to the Atlantic Ocean on the east. The region is peppered with finger lakes, holdovers from the last Ice Ages.

See also

References

  1. ^ "Etymolgy of Pampa" (in Spanish). Retrieved 2015-04-24. 
  2. ^ Zipser, E. J.; C. Liu, D. J. Cecil, S. W. Nesbitt, D. P. Yorty (2006). "Where are the Most Intense Thunderstorms on Earth?". B. Am. Meteorol. Soc. 87 (8): 1057–71. doi:10.1175/BAMS-87-8-1057. 
  3. ^ Virts, Katrina S.; J. M. Wallace, M. L. Hutchins, R. H. Holzworth (2013). "Highlights of a New Ground-Based, Hourly Global Lightning Climatology". B. Am. Meteorol. Soc. 94 (9): 1381–91. doi:10.1175/BAMS-D-12-00082.1. 
  4. ^ Rasmussen, Kristen L.; M. D. Zuluaga, R. A. Houze Jr. (2014). "Severe convection and lightning in subtropical South America". Geophys. Res. Lett. 41 (20): 7359–66. doi:10.1002/2014GL061767. 


External links

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