A review of Late Quaternary inland dune systems of South America east of the Andes

Tripaldi, Alfonsina; Zárate, Marcelo

doi:10.1016/j.quaint.2014.06.069

Cited by 44 publications

(20 citation statements)

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“…The age of these dunes is tens of thousands of years, and the direction of many of them indicates paleowinds rather than modern winds [ Zárate and Tripaldi , ], which may explain the multidirectionality of the observed dunes. Similar results have been reported for other countries in South America, as reviewed by Tripaldi and Zárate []. The South American dunes present an excellent example of the disadvantages of using dunes as wind indicators.…”

Section: Discussionsupporting

confidence: 87%

Earth aeolian wind streaks: Comparison to wind data from model and stations

2017

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Wind streak is a collective term for a variety of aeolian features that display distinctive albedo surface patterns. Wind streaks have been used to map near‐surface winds and to estimate atmospheric circulation patterns on Mars and Venus. However, because wind streaks have been studied mostly on Mars and Venus, much of the knowledge regarding the mechanism and time frame of their formation and their relationship to the atmospheric circulation cannot be verified. This study aims to validate previous studies' results by a comparison of real and modeled wind data with wind streak orientations as measured from remote‐sensing images. Orientations of Earth wind streaks were statistically correlated to resultant drift direction (RDD) values calculated from reanalysis and wind data from 621 weather stations. The results showed good agreement between wind streak orientations and reanalysis RDD (r = 0.78). A moderate correlation was found between the wind streak orientations and the weather station data (r = 0.47); a similar trend was revealed on a regional scale when the analysis was performed by continent, with r ranging from 0.641 in North America to 0.922 in Antarctica. At sites where wind streak orientations did not correspond to the RDDs (i.e., a difference of 45°), seasonal and diurnal variations in the wind flow were found to be responsible for deviation from the global pattern. The study thus confirms that Earth wind streaks were formed by the present wind regime and they are indeed indicative of the long‐term prevailing wind direction on global and regional scales.

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Section: Discussionsupporting

confidence: 87%

Earth aeolian wind streaks: Comparison to wind data from model and stations

2017

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“…Using the revised accumulation model, new proxy data are generated to test against independent records of climate and environmental conditions that provide information on potential drivers of dune activity. While the focus is on the Southern Hemisphere, we do not include the numerous South American dunefields in this analysis, as collectively these have in total fewer than 80 published luminescence ages (Tripaldi and Zarate, ), often from geographically scattered contexts and with very few from any individual dunefield.…”

Section: Approachmentioning

confidence: 99%

Is there evidence for global‐scale forcing of Southern Hemisphere Quaternary desert dune accumulation? A quantitative method for testing hypotheses of dune system development

Thomas

Bailey

2017

Earth Surf Processes Landf

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Luminescence dating of desert dune sediments has generated many hundreds of ages, many used in reconstructions of Quaternary environmental changes, others in attempts to elucidate dune processes. Environmental and climatic interpretations of these records have proved problematic and it remains challenging to test hypotheses of the systematic response of dunefields to changes in external forcing in the past and to make predictions of the future. We use a method that quantifies dune sediment accumulation to interpret dune luminescence age datasets, rather than simply using the ages themselves as proxies of change. The Accumulation Intensity method allows periods of dune sediment accumulation, here over the timescale 102–105 years, to be identified from compilations of dated sand sea stratigraphic sequences. We apply this approach to two of the largest dune age datasets, from southern Africa and Australia, testing whether or not dunefield accumulation has co‐varied in the Late Quaternary and whether systematic relationships to external drivers at global, hemispheric, regional and local scales can be identified. Copyright © 2017 John Wiley & Sons, Ltd.

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“…150 ka (cf. Z arate and Tripaldi, 2012;Tripaldi and Z arate, 2014). The source for these vast eolian deposits are mainly the major west to east flowing rivers emanating from the Andes (Iriondo, 1990), together other sources from the Pampean Ranges and the Brazilian Shield (Morr as, 1999;Z arate, 2003) and possibly contribution of particles by production within the Pampean Sand Sea (cf.…”

Section: Introductionmentioning

confidence: 99%