Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Lupo, Liliana Concepción; Bianchi, Martha S.; Aráoz, Ezequiel; Grau, Ricardo; Lucas, Christoph; Kern, R.; Camacho, María Dolores Polo; Tanner, W. F; Grosjean, Martín

doi:10.1016/j.quaint.2006.05.015

Cited by 21 publications

(17 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…50-60 μm (e.g. Chang Huang et al 2006, Lupo et al 2006. Specifically, in African savanna ecosystems, 50 μm seems to be a threshold where charcoal count reflects fire proximity and intensity (Duffin et al 2008).…”

Section: Relevant Charcoal Measurements To Study Grassland Fire Regimesmentioning

confidence: 99%

Fire history reconstruction in grassland ecosystems: amount of charcoal reflects local area burned

Leys

Brewer

McConaghy

et al. 2015

Environ. Res. Lett.

View full text Add to dashboard Cite

Fire is one of the most prevalent disturbances in the Earth system, and its past characteristics can be reconstructed using charcoal particles preserved in depositional environments. Although researchers know that fires produce charcoal particles, interpretation of the quantity or composition of charcoal particles in terms of fire source remains poorly understood. In this study, we used a unique four-year dataset of charcoal deposited in traps from a native tallgrass prairie in mid-North America to test which environmental factors were linked to charcoal measurements on three spatial scales. We investigated small and large charcoal particles commonly used as a proxy of fire activity at different spatial scales, and charcoal morphotypes representing different types of fuel. We found that small (125-250 μm) and large (250 μm-1 mm) particles of charcoal are well-correlated (Spearman correlation=0.88) and likely reflect the same spatial scale of fire activity in a system with both herbaceous and woody fuels. There was no significant relationship between charcoal pieces and fire parameters <500 m from the traps. Moreover, local area burned (<5 km distance radius from traps) explained the total charcoal amount, and regional burning (200 km radius distance from traps) explained the ratio of non arboreal to total charcoal (NA/T ratio). Charcoal variables, including total charcoal count and NA/T ratio, did not correlate with other fire parameters, vegetation cover, landscape, or climate variables. Thus, in long-term studies that involve fire history reconstructions, total charcoal particles, even of a small size (125-250 μm), could be an indicator of local area burned. Further studies may determine relationships among amount of charcoal recorded, fire intensity, vegetation cover, and climatic parameters.

show abstract

Section: Relevant Charcoal Measurements To Study Grassland Fire Regimesmentioning

confidence: 99%

Fire history reconstruction in grassland ecosystems: amount of charcoal reflects local area burned

Leys

Brewer

McConaghy

et al. 2015

Environ. Res. Lett.

View full text Add to dashboard Cite

show abstract

“…The relief maps further highlight the similarities between the Del Medio and Coiruro catchments, both of which are characterized by an extensive area of high relief in their upper parts. The low‐relief area in the middle of the Yala catchment is the consequence of a landslide that impounded streams and formed several small lakes [ González Díaz and Mon , ; Lupo et al ., ].…”

Section: Resultsmentioning

confidence: 99%

Climatic controls on debris‐flow activity and sediment aggradation: The Del Medio fan, NW Argentina

et al. 2016

View full text Add to dashboard Cite

In the Central Andes, several studies on alluvial terraces and valley fills have linked sediment aggradation to periods of enhanced sediment supply. However, debate continues over whether tectonic or climatic factors are most important in triggering the enhanced supply. The Del Medio catchment in the Humahuaca Basin (Eastern Cordillera, NW Argentina) is located within a transition zone between subhumid and arid climates and hosts the only active debris‐flow fan within this intermontane valley. By combining 10Be analyses of boulder and sediment samples within the Del Medio catchment, with regional morphometric measurements of nearby catchments, we identify the surface processes responsible for aggradation in the Del Medio fan and their likely triggers. We find that the fan surface has been shaped by debris flows and channel avulsions during the last 400 years. Among potential tectonic, climatic, and autogenic factors that might influence deposition, our analyses point to a combination of several favorable factors that drive aggradation. These are in particular the impact of occasional abundant rainfall on steep slopes in rock types prone to failure, located in a region characterized by relatively low rainfall amounts and limited transport capacity. These characteristics are primarily associated with the climatic transition zone between the humid foreland and the arid orogen interior, which creates an imbalance between sediment supply and sediment transfer. The conditions and processes that drive aggradation in the Del Medio catchment today may provide a modern analog for the conditions and processes that drove aggradation in other nearby tributaries in the past.

show abstract

“…In higher elevations, mapping and modelling efforts on mainly glacial but also periglacial archives have documented evidence for severe temperature reductions in NW Argentina, which triggered the decrease of vegetation belts and snowlines, and multiple glacial advances in the Late Quaternary (Schä-bitz 1999; Zipprich et al 2000;Ahumada 2002;Haselton, Hilley & Strecker 2002;Kull et al 2003;Kull et al 2008). On Holocene timescales, the analysis of sedimentary and archaeological archives along the Quebrada de Humahuaca and in the Eastern Cordillera has produced manifold evidence for variations in precipitation amounts and distribution with a marked dry phase during the Mid-Holocene and the return to modern, semi-arid conditions within the last 2 ka BP (Fernández 1984;Alcalde & Kulemeyer 1999;Kulemeyer et al 1999;Maas et al 1999;Kulemeyer 2005;Yacobaccio & Morales 2005;Lupo et al 2006). Most of these results are based on the detailed analysis of a single archive or location.…”

Section: Abbmentioning

confidence: 99%

“…The morphodynamic situation in the Quebrada de Purmamarca is dominated by strong badland formation and gullying along and up the valley slopes, having led to floodplain aggradation and intense debris flow dynamics over the last decades (Becker 1966;Aguero 1986;Chayle & Wayne 1995;Cencetti, Rivelli & Tacconi 2006). Throughout the entire Quebrada de Humahuaca drainage basin, human impact has likely enhanced the degradation of vegetation cover and slopes since at least two thousand years (García Codron et al 1999;Lupo et al 2006).…”

Section: Study Areamentioning

confidence: 99%

Late Quaternary morphodynamics in the Quebrada de Purmamarca, NW Argentina

May

Soler

2011

E&G Quaternary Sci. J.

View full text Add to dashboard Cite

Abstract. Ziel dieser Arbeit ist die Dokumentation geomorphologischer, sedimentärer und paläopedologischer Archive in der Quebrada de Purmamarca. Die Interpretation dieser Archive in Bezug auf die Paläoumweltbedingungen basiert hauptsächlich auf Feldforschungen und geomorphologischer Kartierung (May 2008). Einen Schwerpunkt dieser Studie bildet eine aus grobem Material aufgeschüttete Terrassenfolge. Während die Erosions- und Akkumulationsprozesse vermutlich auf das Zusammenspiel klimatischer und tektonischer Prozesse zurückzuführen sind, steht die Ablagerung der jüngsten ca. 150 m mächtigen Terrassenfläche wohl in Zusammenhang mit dem Absinken des periglazialen Einflussbereiches um mehr als 1000 m unter die heutige Höhenlage. Nach dem Ende der Terrassenschüttung, bieten vor allem Schwemmkegel, äolische Sande und gut entwickelte Paläoböden wertvolle Hinweise auf die durch Feuchtigkeitsveränderungen gesteuerte spätglaziale Landschaftsentwicklung. Die Hauptphase der Einschneidung datiert um einiges nach dem Ende der Terrassenaufschüttung und wurde vermutlich durch eine Zunahme der monsunalen Niederschläge gesteuert. Abschließend konnten die Auswirkungen kleinerer, vermutlich holozäner Schwankungen der Feuchtigkeitsverhältnisse über paläopedologische und geomorphologische Beobachtungen auf der Terrassenoberfläche und den Hängen beschrieben werden.

show abstract

Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Cited by 21 publications

References 19 publications

Fire history reconstruction in grassland ecosystems: amount of charcoal reflects local area burned

Fire history reconstruction in grassland ecosystems: amount of charcoal reflects local area burned

Climatic controls on debris‐flow activity and sediment aggradation: The Del Medio fan, NW Argentina

Late Quaternary morphodynamics in the Quebrada de Purmamarca, NW Argentina

Contact Info

Product

Resources

About