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The Gaussen Index (or Bagnouls-Gaussen Index) or xerothermic index is a method of calculating and comparing aridity.
According to Henri Gaussen (French botanist and biogeographer), a given period is said to be arid, when:
.[1][2]
(P: total precipitation in millimeters over the given period, T: average temperature in °C over the given period)
The resulting index number indicates the number of biologically dry days in a year for a given location (it therefore ranges between 0 and 365). The data includes not only precipitation stricto sensu but also fog, dew and humidity of the air.
In general, it is accepted that an environment is non-arid when the index is less than 100, semi-arid between 100 and 290, arid between 290 and 350, and hyperarid between 350 and 365.
This index is very useful for the use of an ombrothermic diagram [fr], the latter always constructed on the scale model: 1 °C = 2 mm precipitation.
Other indices such as the Louis Emberger rainfall quotient (which is not unique) have been defined. However, the Gaussen index which is simple and precise is still preferable.[3] Indeed Henri Gaussen defines precisely the 4 nuances of Mediterranean climate just against this index,[4] while Emberger defines the level of humidity in a region of Mediterranean climate but does not support precisely this Mediterranean climate.[3]
The calculation does not reflect reality because it is based on averages. For example, according to the calculation, we find a total of 0 biologically dry days in Lyon, for 60 biologically dry days in Marseille.[5]
^Gaussen and Bagnouls 1952, pp. 10–11.
^Gaussen and Bagnouls 1957, p. 194.
^ abTassin, Claude (31 May 2012). Paysages végétaux du domaine méditerranéen : bassin méditerranéen, Californie, Chili central, Afrique du Sud, Australie méridionale [Mediterranean Vegetation Landscapes : Mediterranean basin, California, Central Chile, South Africa, South Australia] (in French). Marseille: IRD Éditions. ISBN 978-2-7099-1731-5.
The GaussenIndex (or Bagnouls-GaussenIndex) or xerothermic index is a method of calculating and comparing aridity. According to Henri Gaussen (French...
Gaussen is a surname. Notable people by that name include: François Gaussen (1790–1863), Swiss Protestant divine. Henri Gaussen (1891-1981), French botanist...
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situated within Mid-Ulster District. The village was founded by Daniel Gaussen in 1788. He built a forge on the shore of Lough Neagh for manufacturing...
motivación golpista. Lima: Instituto de Estudios Peruanos. pp. 46–47. Gaussens, Pierre (2020). "The forced serilization of indigenous population in Mexico...
1771–1773 39 James Sperling 1773–1775 40 Samuel Beachcroft 1775–1777 41 Peter Gaussen 1777–1779 42 Daniel Booth 1779–1781 43 William Ewer 1781–1783 44 Richard...
radically restructure state-society relations along neoliberal lines. Gaussens, Pierre (2020). "The forced serilization of indigenous population in Mexico...
24, 2016. General Register Office. England and Wales Civil Registration Indexes. Bullingdon Registration District, Oxfordshire. Volume 699 Page 574. Cobb...
d'habitants ("spoken in the South of France by fourteen million inhabitants"). Gaussen 1927, p. 4: ...défendre une langue, qui est aujourd'hui la mère de la nôtre...
Prices Index (RPI) inflation target of 2.5%. The target has changed to 2% since the Consumer Price Index (CPI) replaced the Retail Prices Index as the...
Revolutionary War chaplain. John Gast (1715–1788), Irish minister. François Gaussen (1790–1863), pastor and eschatologist, Calvinist who was influential on...
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in CD form in 2001, and the Royal Botanic Garden Edinburgh have made an index to the plant names available online. The idea of a pan-European Flora was...
Kew. n.d. Retrieved December 30, 2022. "Capuron, René Paul Raymond | International Plant Names Index". www.ipni.org. Retrieved 18 December 2021. v t e...
& M. Raynal (2011). Tentacules: de la science à la fiction. Éditions Gaussen, Marseille. 144 pp. ISBN 2-356-98034-2. (in French) Gerhardt, M.I. (1966)...
XCVII. Marriage contract in Paris ANF : Y 195, f. 386v, mentioned after Gaussen 1960 (pp. 200). Claude de Montalan on data.bnf.fr Paris ANF : H 5, 4276/4277...
- Plan Tortue. DONALD-7: Claude Geisenberger, Yves Lebigre and Gérard Gaussen dropped on DZ Devidoire near Nangis, Seine et Marne on 22 May 1944. Objective...
motivación golpista. Lima, Peru: Instituto de Estudios Peruanos. pp. 46–47. Gaussens, Pierre (2020). "The forced serilization of indigenous population in Mexico...
végétaux dans la région méditerranéenne française, Paris, 1897 (publié par Gaussen en 1937) Essai d’une carte botanique et forestière de la France, 1897 La...
of drought (deficit of precipitations, according to the xerothermic index of Gaussen). However, Ciudad Bolívar's climate is not representative of the entire...
establishment Phytotron at Gif-sur-Yvette. In 1962, with his friend Henri Gaussen, he was instrumental in the creation of the Pyrenees National Park. Both...
motivación golpista. Lima, Peru: Instituto de Estudios Peruanos. pp. 46–47. Gaussens, Pierre (2020). "The forced serilization of indigenous population in Mexico...
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