Spatiotemporal variability of modern precipitation <i>δ</i><sup>18</sup>O in the central Andes and implications for paleoclimate and paleoaltimetry estimates

Fiorella, Richard P.; Poulsen, Christopher J.; Zolá, Ramiro S. Pillco; Barnes, J. B.; Tabor, Clay; Ehlers, Todd A.

doi:10.1002/2014jd022893

Cited by 64 publications

(60 citation statements)

References 126 publications

(334 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Also, the elevation of the Altiplano promotes similar reduction. As a result, an inverse relation between stable isotopes and elevation is observed [8,26]. The rest of the year, with smaller precipitation, the atmospheric moisture source is the Pacific.…”

Section: Isotopic Compositions In Precipitationmentioning

confidence: 94%

“…This tendency has been observed in precipitation at high altitudes across the continent [22,28]. This deuterium excess likely results from additional moisture promoted by fast evaporation of inland water bodies and movement of vapor in the upper troposphere down to the ground surface, both enriched in deuterium due to kinetic fractionation processes [8]. …”

Section: Isotopic Compositions In Precipitationmentioning

confidence: 99%

“…Although stable isotopes of hydrogen and oxygen have been widely used in several climate and paleoclimate studies in the Bolivian Altiplano, the scarcity of data, gaps in series, and lack of consistent sampling methods are common problems reducing accuracy of the results [8,22]. This study includes records of oxygen-18 ( 18 O), deuterium ( 2 H), tritium ( 3 H), carbon-13 ( 13 C), and carbon-14 ( 14 C).…”

Section: Data Sampling and Methodsmentioning

confidence: 99%

“…Those are Laica Cota, El Alto, Oruro, Quillacas and El Choro ( Figure 1a). Sampling methodology for isotopes in precipitation follows the IAEA's procedures and recommendations; monthly precipitations were captured, stored, and transported to specialized laboratories to be analyzed (Laica Cota to IAEA laboratory Vienna, Austria; El Alto to Laboratoire de Geochimie et d'Hydrologie Isotopique, Université de Paris-Sud, Orsay, France; Oruro, Quillacas and El Choro to University of Michigan, Department of Earth and Environmental Sciences, USA) [8,9]. To estimate isotopic compositions, methods based on gas-source mass-spectrometry were applied (Oruro, Quillacas and El Choro using Picarro Cavity Ringdown Spectrometer L2120; Laica Cota and El Alto not reported) [3,8].…”

Section: Data Sampling and Methodsmentioning

confidence: 99%

“…Even if the conceptual description above has been established in previous basic studies, the region has been scarcely researched in the last decades. Earlier attempts, analyzing isotopes, considered different stages in the hydrologic cycle like only precipitation [8,9] or only groundwater [10][11][12]. Also, increased…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

Lopez

Barmen

Rosberg

2016

Water

View full text Add to dashboard Cite

Aridity and seasonality of precipitation are characteristics of the highland region in Bolivia. Groundwater becomes an important and safe source of water when surficial bodies are intermittent and affected by natural and anthropogenic contamination. Decades of exploitation of the Challapampa aquifer, combined with lack of information required to understand the groundwater circulation, represent a challenge for reservoir management. This study analyzes isotopic compositions of deuterium and oxygen-18 in different stages in the hydrologic cycle to assess flow patterns in the aquifer, especially in the alluvial fan of River Paria, where records are more extensive in space and time. Interpretations are based on existing and new data. Some implications, such as the age of water, the evaporation effect in groundwater and some thermal intrusions are supported by stable isotopes, tritium, radiocarbon, and electrical conductivity records. New results confirm that modern precipitation over the mountains surrounding the study area is the most important origin of water for shallow aquifers until exploited depths, 100 m below surface. The origin of water in deeper depths, 400 m, seems related to infiltration at higher altitudes and longer residence times.

show abstract

Section: Isotopic Compositions In Precipitationmentioning

confidence: 94%

Section: Isotopic Compositions In Precipitationmentioning

confidence: 99%

Section: Data Sampling and Methodsmentioning

confidence: 99%

Section: Data Sampling and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

Lopez

Barmen

Rosberg

2016

Water

View full text Add to dashboard Cite

show abstract

What drives interannual variation in tree ring oxygen isotopes in the Amazon?

Baker

Gloor

Spracklen

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

Oxygen isotope ratios in tree rings (δ18OTR) from northern Bolivia record local precipitation δ18O and correlate strongly with Amazon basin‐wide rainfall. While this is encouraging evidence that δ18OTR can be used for paleoclimate reconstructions, it remains unclear whether variation in δ18OTR is truly driven by within‐basin processes, thus recording Amazon climate directly, or if the isotope signal may already be imprinted on incoming vapor, perhaps reflecting a pan‐tropical climate signal. We use atmospheric back trajectories combined with satellite observations of precipitation, together with water vapor transport analysis to show that δ18OTR in Bolivia are indeed controlled by basin‐intrinsic processes, with rainout over the basin the most important factor. Furthermore, interannual variation in basin‐wide precipitation and atmospheric circulation are both shown to affect δ18OTR. These findings suggest δ18OTR can be reliably used to reconstruct Amazon precipitation and have implications for the interpretation of other paleoproxy records from the Amazon basin.

show abstract

Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes

et al. 2017

View full text Add to dashboard Cite

Tectonic development of the Andean Cordillera has profoundly changed the topography, climate, and vegetation patterns of the southern central Andes. The Cenozoic Bermejo Basin in Argentina (~30°S) provides a key record of thrust belt kinematics and paleoclimate south of the high‐elevation Puna Plateau. Ongoing debate regarding the timing of initiation of upper plate shortening and Andean uplift persists, precluding a thorough understanding of the earlier tectonic and climatic controls on basin evolution. We present new sedimentology, detrital geochronology, sandstone petrography, and subsidence analysis from the Bermejo Basin that reveal siliciclastic‐evaporative fluvial and lacustrine environments prior to the main documented phase of Oligocene‐Miocene shortening of the Frontal Cordillera and Argentine Precordillera. We report the first radiometric dates from detrital zircons collected in the Ciénaga del Río Huaco Formation, previously mapped as Permian, that constrain a Late Cretaceous (~95–93 Ma) maximum depositional age. Provenance and paleocurrent data from these strata indicate that detritus was derived from dissected arc and cratonic sources in the north and northeast. Detrital zircon U‐Pb ages of ~37 Ma from the overlying red beds suggest that foredeep sedimentation began by at least the late Eocene. At this time, sediment dispersal shifted from axial southward to transversal eastward from the Andean Arc and Frontal Cordillera. Subsidence analysis of the basin fill is compatible with increasing tectonic deformation beginning in Eocene time, suggesting that a distal foredeep maintained fluvial connectivity to the hinterland during topographic uplift and unroofing of the Frontal Cordillera, prior to Oligocene‐Miocene deformation across the Precordillera.

show abstract

Spatiotemporal variability of modern precipitation δ¹⁸O in the central Andes and implications for paleoclimate and paleoaltimetry estimates

Cited by 64 publications

References 126 publications

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

What drives interannual variation in tree ring oxygen isotopes in the Amazon?

Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes

Contact Info

Product

Resources

About

Spatiotemporal variability of modern precipitation δ18O in the central Andes and implications for paleoclimate and paleoaltimetry estimates

Cited by 64 publications

References 126 publications

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

Groundwater Origins and Circulation Patterns Based on Isotopes in Challapampa Aquifer, Bolivia

What drives interannual variation in tree ring oxygen isotopes in the Amazon?

Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes

Contact Info

Product

Resources

About

Spatiotemporal variability of modern precipitation δ¹⁸O in the central Andes and implications for paleoclimate and paleoaltimetry estimates