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Artículo

Can stable isotopes ride out the storms? The role of convection for water isotope in models, records, and paleoaltimetry studies in the central Andes

Rohrmann, Alexander; Strecker, Manfred R.; Bookhagen, Bodo; Mulch, Andreas; Sachse, Dirk; Pingel, Heiko; Alonso, Ricardo NarcisoIcon ; Schildgen, Taylor F.; Montero Lopez, Maria CarolinaIcon
Fecha de publicación: 24/10/2014
Editorial: Elsevier
Revista: Earth and Planetary Science Letters
ISSN: 0012-821X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geoquímica y Geofísica

Resumen

Abstract: Globally, changes in stable isotope ratios of oxygen and hydrogen (δ18Oand δD) in the meteoric water cycle result from distillation and evaporation processes. Isotope fractionation occurs when air masses rise in elevation, cool, and reduce their water-vapor holding capacity with decreasing temperature. Assuch, δ18Oand δDvalues from a variety of sedimentary archives are often used to reconstruct changes in continental paleohydrology as well as paleoaltimetry of mountain ranges. Based on 234 stream-water samples, wedemonstrate that areas experiencing deep convective storms in the eastern south?central Andes (22?28◦S) do not show the commonly observed relationship between δ18Oand δDwith elevation. These convective storms arise from intermontane basins, where diurnal heating forces warm air masses upward, resulting in cloudbursts and raindrop evaporation. Especially at the boundary between the tropical and extra-tropical atmospheric circulation regimes where deep-convective storms are very common (∼26◦to 32◦N andS), the impact of such storms may yield non-systematic stable isotope-elevation relationships as convection dominates over adiabatic lifting of air masses. Because convective storms can reduce or mask the depletion of heavy isotopes in precipitation as a function of elevation, linking modern or past topography to patterns of stable isotope proxy records can be compromised in mountainous regions, and atmospheric circulation models attempting to predict stable isotope patterns must have sufficiently high spatial resolution to capture the fractionation dynamics of convective cells.
Palabras clave: Isotopes , Andes , Precipitation , Convection
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/6267
URL: http://www.sciencedirect.com/science/article/pii/S0012821X14005767
DOI: http://dx.doi.org/10.1016/j.epsl.2014.09.021
DOI: http://dx.doi.org/ 10.1016/j.epsl.2014.09.021
Colecciones
Articulos(CCT - SALTA-JUJUY)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SALTA-JUJUY
Articulos(IBIGEO)
Articulos de INST.DE BIO Y GEOCIENCIAS DEL NOA
Articulos(INSUGEO)
Articulos de INST.SUP.DE CORRELACION GEOLOGICA
Citación
Rohrmann, Alexander; Strecker, Manfred R.; Bookhagen, Bodo; Mulch, Andreas; Sachse, Dirk; et al.; Can stable isotopes ride out the storms? The role of convection for water isotope in models, records, and paleoaltimetry studies in the central Andes; Elsevier; Earth and Planetary Science Letters; 407; 24-10-2014; 187-195
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