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Abstract:

Drought episodes during the early-mid 20th century were recognized and described in several places around the world, with extreme dry conditions and widespread landscape denudation, like during the famous 'Dust Bowl' in North America. However, there is scant documentation of droughts in southern South America, particularly from the Pampas, and none based on the geological record. In this article, we provide clear evidence of aeolian reactivation and sand deposition in some areas of La Pampa and San Luis provinces, western Pampas (Argentina), during early-mid 20th century in response to drier conditions, probably amplified, like historic droughts in North America, by anthropogenic factors (e.g. significant population increase and agriculture expansion into a fragile environment). Evidence includes widespread bare sand blowouts, extensive surfaces with active sand migration, steep dune lee slopes, and sharp crests covered by weak soil development (A/C profile), accompanied by historical documents. Optically stimulated luminescence (OSL) ages on aeolian beds confirm mobilization and sedimentation by wind processes c. 95-60 yr BP. Considering the dominant (over 70%) austral spring-summer precipitation, it is possible the rainfall deficit in western Pampas was linked to positive sea surface temperature (SST) anomalies in the western subtropical South Atlantic Ocean (20-30°S and 30-50° W), according to significant canonical correlation between the precipitation field in subtropical South America and the Atlantic Ocean SST anomalies. © The Author(s) 2013.

Registro:

Documento: Artículo
Título:Geological evidence for a drought episode in the western Pampas (Argentina, South America) during the early-mid 20th century
Autor:Tripaldi, A.; Zárate, M.A.; Forman, S.L.; Badger, T.; Doyle, M.E.; Ciccioli, P.
Filiación:IGEBA-CONICET, University of Buenos Aires, Argentina
INCITAP-CONICET, University of La Pampa, Argentina
EaES Department, University of Illinois at Chicago, United States
CIMA-CONICET, University of La Pampa, Argentina
Palabras clave:20th century; aeolian record; optically stimulated luminescence dating; Pampas Dust Bowl; South America; western Pampas; anthropogenic effect; depositional environment; drought stress; eolian deposit; landscape; luminescence; mobilization; precipitation (climatology); rainfall; sea surface temperature; sedimentation; twentieth century; Argentina; Atlantic Ocean; Atlantic Ocean (South); Pampas
Año:2013
Volumen:23
Número:12
Página de inicio:1731
Página de fin:1746
DOI: http://dx.doi.org/10.1177/0959683613505338
Título revista:Holocene
Título revista abreviado:Holocene
ISSN:09596836
CODEN:HOLOE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09596836_v23_n12_p1731_Tripaldi

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Citas:

---------- APA ----------
Tripaldi, A., Zárate, M.A., Forman, S.L., Badger, T., Doyle, M.E. & Ciccioli, P. (2013) . Geological evidence for a drought episode in the western Pampas (Argentina, South America) during the early-mid 20th century. Holocene, 23(12), 1731-1746.
http://dx.doi.org/10.1177/0959683613505338
---------- CHICAGO ----------
Tripaldi, A., Zárate, M.A., Forman, S.L., Badger, T., Doyle, M.E., Ciccioli, P. "Geological evidence for a drought episode in the western Pampas (Argentina, South America) during the early-mid 20th century" . Holocene 23, no. 12 (2013) : 1731-1746.
http://dx.doi.org/10.1177/0959683613505338
---------- MLA ----------
Tripaldi, A., Zárate, M.A., Forman, S.L., Badger, T., Doyle, M.E., Ciccioli, P. "Geological evidence for a drought episode in the western Pampas (Argentina, South America) during the early-mid 20th century" . Holocene, vol. 23, no. 12, 2013, pp. 1731-1746.
http://dx.doi.org/10.1177/0959683613505338
---------- VANCOUVER ----------
Tripaldi, A., Zárate, M.A., Forman, S.L., Badger, T., Doyle, M.E., Ciccioli, P. Geological evidence for a drought episode in the western Pampas (Argentina, South America) during the early-mid 20th century. Holocene. 2013;23(12):1731-1746.
http://dx.doi.org/10.1177/0959683613505338