The climate is temperate, with precipitation of 600 to 1,200 mm (23.6 to 47.2 in) that is more or less evenly distributed throughout the year, making the soils appropriate for agriculture. The area is also one of the distinct physiography provinces of the larger Paraná–Paraguay plain division.
This region has generally low elevations, whose highest levels generally do not exceed 600 metres (2,000 ft) in altitude. The coastal areas and most of the Buenos Aires Province are predominantly plain (with some wetlands) and the interior areas (mainly in the southern part of the Brazilian state of Rio Grande do Sul and Uruguay) have low ranges of hills (like Serras de Sudeste in Brazil and Cuchilla Grande in Uruguay). Low hills covered by grasslands are called coxilhas (Portuguese pronunciation:[koˈʃiʎɐs]) in Portuguese and cuchillas (Spanish pronunciation:[kuˈtʃiʝas]) in Spanish, and it is the most typical landscape of the countryside areas in the northern parts of the Pampas. The highest elevations of the Pampas region are found in the Sierra de la Ventana mountains, in the southern part of Buenos Aires Province, with 1,239 metres (4,065 ft) at the summit of Cerro Tres Picos.
The Ventana mountains ranges are the most important system in the Pampas Plain.
The climate of the Pampas is generally temperate, gradually giving way to a more humid subtropical climate in the north (Cfa, according to the Köppen climate classification, with a Cwa tendency (drier winters) in the northwestern edge); a cold semi-arid climate (BSk) on the southern and western fringes (like San Luis Province, western La Pampa Province and southern Buenos Aires Province); and an oceanic climate (Cfb) in the southeastern part (in the localities of Mar del Plata, Necochea, Tandil and the Sierra de la Ventana mountains, Argentina). Summer temperatures are more uniform than winter temperatures, generally ranging from 28 to 33 °C (82 to 91 °F) during the day. However, most cities in the Pampas occasionally have high temperatures that push 38 °C (100 °F), as occurs when warm, dry, northerly winds blow from southern Brazil, northern Argentina or Paraguay. Autumn arrives gradually in March and peaks in April and May. In April, highs range from 20 to 25 °C (68 to 77 °F) and lows from 9 to 13 °C (48 to 55 °F). The first frosts arrive in mid-April in the south and late May or early June in the north.
Coxilhas (low hills covered by grasslands) in Morro Redondo, Rio Grande do Sul, Brazil
Winters are generally mild, but cold waves often occur. Typical temperatures range from 12 to 19 °C (54 to 66 °F) during the day, and from 1 to 6 °C (34 to 43 °F) at night. With strong northerly winds, days of over 25 °C (77 °F) can be recorded almost everywhere, and during cold waves, high temperatures can be only 6 °C (43 °F). Frost occurs everywhere in the Pampas, but it is much more frequent in the southwest than around the Parana and Uruguay Rivers. Temperatures under −5 °C (23 °F) can occur everywhere, but values of −10 °C (14 °F) or lower are confined to the south and west. Snow almost never falls in the northernmost third and is rare and light elsewhere, except for exceptional events in which depths have reached 30 cm (12 in). 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 35 °C (95 °F) can give way to nights of under 5 °C (41 °F) or even frost, all within only a few days.
Precipitation ranges from 1,400 millimetres (55 in) in the northeast to about 400 millimetres (16 in) or less in the southern and western edges. It is highly seasonal in the West, with some places recording averages of 120 millimetres (4.7 in) monthly in the summer, and only 20 millimetres (0.79 in) monthly in the winter. The eastern areas have small peaks in the fall and 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, and so 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.[1][2] The severe thunderstorms produce intense hailstorms, both floods and flash floods, and the most consistently active tornado region outside the central and southeastern US.[3]
Human activity has caused major changes to the wildlife of the Pampas. Most big or medium-sized species such as puma, rhea, Capybara, plains viscacha, maned wolf,[4]marsh deer and Pampas deer have lost their habitats especially due to the spread of agriculture and ranching, and are only present in very few relicts of the pampas.[5] Other species, such as the Jaguar and the Guanaco have been extirpated completely from this habitat.
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.
Why the pristine pampas were treeless regions has been much debated. Perhaps the most commonly cited explanation is seasonal drought. A related hypothesis is that grass roots compete for water and exclude tree seedlings. The effect might be increased by heavy, clayed soils which limit tap root penetration. Other causes that have been proposed are fires set by indigenous peoples for land clearance; the existence of heavy-bodied herbivores; and that the pampas are relicts of drier past climates. These explanations have been criticised as mono-causal. "Overall, we expect that low propagule pressure, abiotic stresses, biotic resistance, and a paucity of specific symbionts might have exerted a synergistic influence in slowing tree invasion rates ".[11]
The World Wildlife Fund divides the Pampas into three distinct ecoregions. The Uruguayan Savanna lies east of the Paraná 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 Semiarid 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 cold to mild, and summers are hot 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 cultivate vineyards in the Buenos Aires wine region. The area is also used for farming honey using European honeybees. These farming regions are particularly susceptible to flooding during thunderstorms. The weather averages out to be 16 °C (60 °F) year-round in the Pampas.
Starting in the 1840s but intensifying after the 1880s, European immigrants began to migrate to the Pampas, first as part of government-sponsored colonization schemes to settle the land and later as tenant farmers "working as either a sharecropper or as paid laborers for absentee landowners"[12] in an attempt to make a living for themselves.
However, many immigrants eventually moved to more permanent employment in cities, as industrialization picked up after the 1930s. As a result, Argentina's history of immigration in Buenos Aires Province is typically associated with cities and urban life, unlike in Entre Ríos Province and Santa Fe Province, where European immigration took on a more rural profile.
^Chaneton, Enrique J.; Mazía, Noemí; Batista, William B.; Rolhauser, Andrés G.; Ghersa, Claudio M. (2012). "Woody Plant Invasions in Pampa Grasslands: A Biogeographical and Community Assembly Perspective". In Myster, Randall W. (ed.). Ecotones Between Forest and Grassland. Springer. doi:10.1007/978-1-4614-3797-0_5. ISBN978-1-4614-3797-0. Retrieved 7 May 2024., pp. 122-7.
^Meade, Teresa A. (2016). History of Modern Latin America: 1800 to the Present. Wiley Blackwell Concise History of the Modern World. Wiley. ISBN978-1-118-77248-5.
Argentina
Brazil
Uruguay
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Skeleton of the giant ground sloth Megatherium americanum, a former denizen of the Pampas
Skeleton of Toxodon
Skeleton of Doedicurus
Skeleton of Notiomastodon
Skeleton of the equine Hippidion
Skeleton of Macrauchenia
Skeleton of Smilodon populator
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Argentina
Buenos Aires: 17,569,053
Córdoba: 3,978,984
Santa Fe: 3,556,522
Buenos Aires City: 3,120,612
Entre Ríos: 1,426,426
La Pampa: 366,022
Brazil
Rio Grande do Sul: 10,882,965
Uruguay
