Climate Change in Southern South America During the Last Two Millennia

Moy, Christopher; Moreno, Patricio I.; Dunbar, Robert B.; Kaplan, Michael R.; François, J; Villalba, Ricardo; Haberzettl, Torsten

doi:10.1007/978-90-481-2672-9_15

Cited by 55 publications

(62 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Higher 120 precipitation causes greater influx of magnetic minerals to the deep isolated sub-basins within the lake. A 121 prominent decline in Fe through the Holocene towards modern argues for a reduction in westerly derived 122 precipitation, an inference that is opposite from existing records in the region (Huber et al, 2004, 123 Markgraf and Huber, 2010, Moreno et al, 2009). Moreover, magnetic susceptibility levels in all cores 124 collected in the eastern basin increase through the Holocene, signaling an overall increase in the 125 abundance of ferromagnetic minerals that might be associated with enhanced runoff (increased 126 westerlies).…”

Section: Introduction 69mentioning

confidence: 89%

A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

Moy

Dunbar

Guilderson

et al. 2011

Earth and Planetary Science Letters

Self Cite

View full text Add to dashboard Cite

Section: Introduction 69mentioning

confidence: 89%

A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

Moy

Dunbar

Guilderson

et al. 2011

Earth and Planetary Science Letters

Self Cite

View full text Add to dashboard Cite

“…Rainfall and temperature oscillations over South America are due to a complex interplay of large scale ocean-atmosphere processes, such as El Niño Southern Oscillation, the Pacific Decadal Oscillation, the Southern Annual Mode or the Antarctic Oscillation (Moy et al, 2009). These largescale processes play a role on both temperature oscillations at several timescales and on the amount and distribution of precipitation through changes in the strength and latitudinal position of the wind belts.…”

Section: Climate Forcing Of the Laminae Formationmentioning

confidence: 99%

Biogeochemical processes controlling oxygen and carbon isotopes of diatom silica in Late Glacial to Holocene lacustrine rhythmites

Hernández

Bao

Giralt

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

Biogeochemical cycles and sedimentary records in lakes are related to climate controls on hydrology and catchment processes. Changes in the isotopic composition of the diatom frustules (δ 18 O diatom and δ 13 C diatom ) in lacustrine sediments can be used to reconstruct palaeoclimatic and palaeoenvironmental changes. The Lago Chungará (Andean Altiplano, 18°15′S, 69°10′W, 4520 masl) diatomaceous laminated sediments are made up of white and green multiannual rhythmites. White laminae were formed during short-term diatom superblooms, and are composed almost exclusively of large-sized Cyclostephanos andinus. These diatoms bloom during mixing events when recycled nutrients from the bottom waters are brought to the surface and/or when nutrients are introduced from the catchment during periods of strong runoff. Conversely, the green laminae are thought to have been deposited over several years and are composed of a mixture of diatoms (mainly smaller valves of C. andinus and Discostella stelligera) and organic matter. These green laminae reflect the lake's hydrological recovery from a status favouring the diatom super-blooms (white laminae) towards baseline conditions. δ 18 O diatom and δ 13 C diatom from 11,990 to 11,530 cal years BP allow us to reconstruct shifts in the precipitation/evaporation ratio and changes in the lake water dissolved carbon concentration, respectively. δ 18 O diatom values indicate that white laminae formation occurred mainly during low lake level stages, whereas green laminae formation generally occurred during high lake level stages. The isotope and chronostratigraphical data together suggest that white laminae deposition is caused by extraordinary environmental events. El Niño-Southern Oscillation and changes in solar activity are the most likely climate forcing mechanisms that could trigger such events, favouring hydrological changes at interannual-to-decadal scale. This study demonstrates the potential for laminated lake sediments to document extreme pluriannual events.

show abstract

“…In absence of paleoclimatic data, the forcing of the Southern Hemisphere's climate system is poorly known. Several studies have been initiated to fill in this gap 10 (e.g., Villalba et al, 2009;Neukom and Gergis, 2012). As of 2012, 174 monthly to annually resolved climate proxy records covering the last 2000 years have been collected (Neukom and Gergis, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…There are few paleoclimatic data in South America and those are restricted to the southern portion of the continent, which may bias our understanding of the region. This is an important region that lies in the center of the modern westerly wind field and therefore allows for the examination of past westerly wind variability (Boninsegna et al, 2009;Villalba et al, 2009;PAGES-2K Network, 2013;25 Flantua et al, 2016). Moy et al (2009) analyzed multiple paleoclimate records, including meteorological, palynological, and dendrochronological data, and deduced a temperature decrease and an increase in westerly wind intensity during the Little Ice Age, following arid conditions during the Medieval Climate Anomaly.…”

Section: Introductionmentioning

confidence: 99%

“…This is an important region that lies in the center of the modern westerly wind field and therefore allows for the examination of past westerly wind variability (Boninsegna et al, 2009;Villalba et al, 2009;PAGES-2K Network, 2013;25 Flantua et al, 2016). Moy et al (2009) analyzed multiple paleoclimate records, including meteorological, palynological, and dendrochronological data, and deduced a temperature decrease and an increase in westerly wind intensity during the Little Ice Age, following arid conditions during the Medieval Climate Anomaly. Neukom et al (2010) examined the hydroclimate of southern South America for the past 500 years using a multiproxy approach and inferred a multi-centennial increase in summer precipitation and a decrease in winter precipitation into the 20th century.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent climate variations in Chile: constraints from borehole temperature profiles

Pickler¹,

Fausto²,

Beltrami³

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. We have compiled, collected, and analyzed 31 temperature depth profiles from boreholes in the Atacama desert in central and northern Chile. After screening these profiles, we found that only 9 profiles at 4 different sites were suitable to invert for ground temperature history. For all the sites, no surface temperature variations could be resolved for the period 1500-1800. In the northern coastal region of Chile, there is no perceptible temperature variation at all from 1500 to present. In the northern central Chile region, between 26• S and 28• S, the data suggest a cooling from ∼1850 to ∼1980 followed by a 5 1.9 K warming starting ∼20-40 years BP. This result is consistent with the ground surface temperature histories for Peru and the semiarid regions of South America. The duration of the cooling trend is poorly resolved and it may coincide with a marked short cooling interval in the 1960s that is found in meteorological records. The total warming is greater than that inferred from proxy climate reconstructions for central Chile and southern South America, and by the PMIP3/CMIP5 surface temperature simulations for the north-central Chile grid points. The differences between different climate reconstructions, meteorological 10 records, and models are likely due to differences in spatial and temporal resolution between the various data sets and the models.

show abstract

Climate Change in Southern South America During the Last Two Millennia

Cited by 55 publications

References 101 publications

A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

Biogeochemical processes controlling oxygen and carbon isotopes of diatom silica in Late Glacial to Holocene lacustrine rhythmites

Recent climate variations in Chile: constraints from borehole temperature profiles

Contact Info

Product

Resources

About