<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE article SYSTEM "http://www.adv-geosci.net/inc/adgeo/copernicus.dtd">
<article language="en">
	<journal>
		<journal_title>Advances in Geosciences</journal_title>
		<journal_url>www.adv-geosci.net</journal_url>
		<issn>1680-7340</issn>
		<eissn>1680-7359</eissn>
		<volume_number>22</volume_number>
		<volume_title>4th EGU Alexander von Humboldt Conference &quot;The Andes: Challenge for Geosciences&quot;</volume_title>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/adgeo-22-13-2009</doi>
	<article_url>http://www.adv-geosci.net/22/13/2009/</article_url>
	<abstract_html>http://www.adv-geosci.net/22/13/2009/adgeo-22-13-2009.html</abstract_html>
	<fulltext_pdf>http://www.adv-geosci.net/22/13/2009/adgeo-22-13-2009.pdf</fulltext_pdf>
	<start_page>13</start_page>
	<end_page>25</end_page>
	<publication_date>2009-10-13</publication_date>
	<article_title content_type="html">Climate variability of the tropical Andes since the late Pleistocene</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>A. Bräuning</name>
			<email>abraeuning@geographie.uni-erlangen.de</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Institute for Geography, University of Erlangen-Nuremberg, Germany</affiliation>
	</affiliations>
	<abstract content_type="html">Available proxy records witnessing palaeoclimate of the tropical Andes are
comparably scarce. Major implications of palaeoclimate development in the
humid and arid parts of the Andes are briefly summarized. The long-term
behaviour of ENSO has general significance for the climatic history of the
Andes due to its impact on regional circulation patterns and precipitation
regimes, therefore ENSO history derived from non-Andean palaeo-records is
highlighted. Methodological constraints of the chronological precision and
the palaeoclimatic interpretation of records derived from different natural
archives, such as glacier sediments and ice cores, lake sediments and
palaeo-wetlands, pollen profiles and tree rings are addressed and
complementary results concerning former climatic conditions are discussed in
terms of possible implications of former atmospheric circulation patterns
and main climatic forcing factors. During the last years, increasing
tree-ring information is getting available from the tropical Andes,
providing high-resolution climate-sensitive records covering the past
centuries for the study of climate variability.</abstract>
	<references>
		<reference numeration="1" content_type="text"> % vor jede Referenz Abbott, M. B., Wolfe, B. B., Wolfe, A. P., Seltzer, G. O., Aravena, R., Mark, B. G., Polissar, P. J., Rodbell, D. T., Rowe, H. D., and Vuille, M.: Holocene paleohydrology and glacial history of the central Andes using multiproxy lake sediment studies, Palaeogeogr. Palaeocl., 194, 123–138, 2003. </reference>
		<reference numeration="2" content_type="text"> Amman, C., Jenny, B., Kammer, K., and Messerli, B.: Late Quaternary glacier response to humidity changes in the arid Andes of Chile (18–29&amp;deg; S), Palaeogeogr. Palaeocl., 172, 313–326, 2001. </reference>
		<reference numeration="3" content_type="text"> Baker, P. A., Rigsby, C. A., Seltzer, G. O., Fritz, S. C., Lowenstein, T. K., Bacher, N. P., and Veliz, C.: Tropical climate changes at millennial and orbital timescales on the Bolivian Altiplano, Nature, 409, 698–701, 2001a. </reference>
		<reference numeration="4" content_type="text"> Baker, P. A., Seltzer, G. O., Fritz, S. C., Dunbar, R. B., Grove, M. J., Tapia, P. M., Cross, S. L., Rowe, H. D., and Broda, J. P.: The history of South American tropical precipitation for the past 25000 years, Science, 291, 640–643, 2001b. </reference>
		<reference numeration="5" content_type="text"> Barichivich, J., Sauchyn, D. J., and Lara, A.: Climate signals in high elevation tree-rings from the semiarid Andes of north-central Chile: Responses to regional and large-scale variability, Palaeogeogr. Palaeocl., doi:10.1016/j.palaeo.2007.10.033, in press, 2008. </reference>
		<reference numeration="6" content_type="text"> Berger, A. and Loutre, M. F.: Insolation values for the climate of the last 10 Million years, Quaternary Sci. Rev., 10, 297–317, 1991. </reference>
		<reference numeration="7" content_type="text"> Betancourt, J. L., Latorre, C., Rech, J. A., Quade, J., and Rylander, K. A.: A 22000-year record of monsoonal precipitation from Northern Chile&apos;s Atacama desert, Science, 289, 1542–1546, 2000. </reference>
		<reference numeration="8" content_type="text"> Biondi, F.: A 400-year tree-ring chronology from the tropical treeline of North America, Ambio, 30, 162–166, 2001. </reference>
		<reference numeration="9" content_type="text"> Bradley, R. S., Vuille, M., Hardy, D., and Thompson, L. G.: Low latitude ice cores record Pacific sea surface temperatures, Geophys. Res. Lett., 30, 1174, doi:10.1029/2002GL016546, 2003. </reference>
		<reference numeration="10" content_type="text"> Bobst, A. L., Lowenstein, T. K., Jordan, T. E., Godfrey, L. V., Ku, T.-L., and Luo, S.: A 106 ka paleoclimate record from drill core of the Salar de Atacama, northern Chile, Palaeogeogr. Palaeocl., 173, 21–42, 2001. </reference>
		<reference numeration="11" content_type="text"> Bräuning, A., Homeier, J., Cueva, E., Beck, E., and Günter, S.: Growth dynamics of trees in tropical mountain ecosystems, Ecol. Stud., 198, 291–302, 2008a. </reference>
		<reference numeration="12" content_type="text"> Bräuning, A., von Schnakenburg, P., Volland-Voigt, F., and Peters, T.: Seasonal growth dynamics and its climate forcing in a tropical mountain rain forest in southern Ecuador, TRACE – Tree Rings in Archaeology, Climatology and Ecology, 6, 27–30, 2008b. </reference>
		<reference numeration="13" content_type="text"> Bush, M. B., Colinvaux, P. A., Wiemann, M. C., Piperno, D. R., and Liu, K.-B: Late Pleistocene temperature depression and vegetation change in Ecuadorian Amazonia, Quaternary Res., 34, 330–345, 1990. </reference>
		<reference numeration="14" content_type="text"> Bush, M. B., Hansen, C. S., Rodbell, D. T., Seltzer, G. O., Young, K. R., Leon, B., Abott, M. B., Silman, M. R., and Gosling, W. D.: A 17000-year history of Andean climate and vegetation change from Laguna de Chochos, Peru, J. Quaternary Sci., 20, 703–714, 2005. </reference>
		<reference numeration="15" content_type="text"> Christie, D. A., Lara, A., Barichivich, J., Villalba, R., Morales, M. A., and Cuq, E.: El Niño-Southern Oscillation signal in the world&apos;s highest-elevation tree-ring chronologies from the Altiplano, Central Andes, Palaeogeogr. Palaeocl., doi:10.1016/j.palaeo.2007.10.033, in press, 2008. </reference>
		<reference numeration="16" content_type="text"> Clapperton, C. M., Clayton, J. D., Benn, D. I., Marden, C. J., and Argollo, J.: Late Quaternary glacier advances and palaeolake highstands in the Bolivian Altiplano, Quatern. Int., 38–39, 49–59, 1997. </reference>
		<reference numeration="17" content_type="text"> Clapperton, C. M.: Interhemispheric synchroneity of marine oxygen isotope stage 2 glacier fluctuations along the American cordilleras transect, J. Quaternary Sci., 15, 435–468, 2000. </reference>
		<reference numeration="18" content_type="text"> Clayton, J. D. and Clapperton, C. M.: Broad synchrony of a Late Glacial glacier advance and the highstand of paleolake Tauca in the Bolivian Altiplano, J. Quaternary Sci., 12, 169–182, 1997. </reference>
		<reference numeration="19" content_type="text"> Cleaveland, M. K., Stahle, D. W., Therrell, M. D., Villanueva-Diaz, J., and Burns, B. T.: Tree-ring reconstructed winter precipitation and tropical teleconnections in Durango, Mexico, Climatic Change, 59, 369–388, 2003. </reference>
		<reference numeration="20" content_type="text"> Clement, A. C., Seager, R., and Cane, M. A.: Suppression of El Niño during the mid-Holocene by changes in the earth&apos;s orbit, Paleoceanography, 15, 731–737, 2000. </reference>
		<reference numeration="21" content_type="text"> Clement, A. C., Cane, M. A., and Seager, R.: An orbitally driven tropical source of abrupt climate change, J. Climate, 14, 2369–2375, 2001. </reference>
		<reference numeration="22" content_type="text"> D&apos;Arrigo, R., Cook, E. R., Wilson, R. J., Allan, R., and Mann, M. E.: On the variability of ENSO over the past six centuries, Geophys. Res. Lett., 32, L03711, doi:10.1029/2004GL0220554, 2005. </reference>
		<reference numeration="23" content_type="text"> Diaz, H. F. and Markgraf, V.: El Niño. Historical and paleoclimatic aspects of the Southern Oscillation, Cambridge University Press, Cambridge, 1992. </reference>
		<reference numeration="24" content_type="text"> Díaz, S. C., Touchan, R., and Swetnam, T. W.: A tree-ring reconstruction of past precipitation for Baja California Sur, Mexico, Int. J. Climatol., 21, 1007–1019, doi:10.1002/joc.664, 2001. </reference>
		<reference numeration="25" content_type="text"> Evans, M. N. and Schrag, D. P.: A stable isotope-based approach to tropical dendroclimatology, Geochim. Cosmochim. Ac., 68, 3295–3305, 2004. </reference>
		<reference numeration="26" content_type="text"> Favier, V., Wagnon, P., and Ribstein, P.: Glaciers of the outer and inner tropics: A different behaviour but a common response to climatic forcing, Geophys. Res. Lett., 31, L16403, doi:10.1029/2004GL020654, 2004. </reference>
		<reference numeration="27" content_type="text"> Fornari, M., Risacher, F., and Féraud, G.: Dating of paleolakes in the central Altiplano of Bolivia, Palaeogeogr. Palaeocl., 172, 269–282, 2001. </reference>
		<reference numeration="28" content_type="text"> Francou, B., Vuille, M., Wagnon, P., Mendoza, J., and Sicart, J.-E.: Tropical climate change recorded by a glacier in the central Andes during the last decades of the twentieth century: Chacaltaya, Bolivia, 16&amp;deg; S, J. Geophys. Res., 108(D5), 4154, doi:10.1029/2002JD002959, 2003. </reference>
		<reference numeration="29" content_type="text"> Francou, B., Vuille, M., Favier, V., and Cáceres, B.: New evidence for an ENSO impact on low-latitude glaciers: Antizana 15, Andes of Ecuador, 0&amp;deg;28´ S, J. Geophys. Res., 109, D18106, doi:10.1029/2003JD004484, 2004. </reference>
		<reference numeration="30" content_type="text"> Garreaud, R., Vuille, M., and Clement, A. C.: The climate of the Altiplano: observed current conditions and mechanisms of past changes, Palaeogeogr. Palaeocl., 194, 5–22, 2003. </reference>
		<reference numeration="31" content_type="text"> Garreaud, R. D., Vuille, M., Compagnucci, R., and Marengo, J.: Present-day South American climate, Palaeogeogr. Palaeocl., doi:10.1016/j.palaeo.2007.10.032, in press, 2008. </reference>
		<reference numeration="32" content_type="text"> Gedalof, Z., Mantua, N. J., and Peterson, D. L.: A multi-century perspective of variability in the Pacific Decadal Oscillation: new insights from tree rings and coral, Geophys. Res. Lett., 29(D5), 4154, doi:10.1029/2002GL015824, 2002. </reference>
		<reference numeration="33" content_type="text"> Geyh, M., Grosjean, M., N\&apos;uñez, L., and Schotterer, U.: Radiocarbon reservoir effect and the timing of the late-glacial/early holocene humid phase in the Atacama Desert, Quaternary Res., 52, 143–153, 1999. </reference>
		<reference numeration="34" content_type="text"> Grosjean, M., Cartajena, I., Geyh, M., and Nuñez, L.: From proxy data to paleoclimate interpretation: the mid-Holocene paradox of the Atacama Desert, northern Chile, Palaeogeogr. Palaeocl., 194, 247–258, 2003. </reference>
		<reference numeration="35" content_type="text"> Grosjean, M., Geyh, M. A., Messerli, B., Schreier, H., and Veit, H.: A late-holocene ($&lt;$2600 BP) glacial advance in the south-central Andes (29&amp;deg; S), northern Chile, Holocene, 8, 473–479, 1998. </reference>
		<reference numeration="36" content_type="text"> Grosjean, M., N\&apos;uñez, L., Cartajena, I., and Messerli, B.: Mid-Holocene climate and culture change in the Atacama Desert, Northern Chile, Quaternary Res., 48, 239–246, 1997. </reference>
		<reference numeration="37" content_type="text"> Grosjean, M., Geyh, M. A., Messerli, B., and Schotterer, U.: Late-glacial and early Holocene lake sediments, ground-water formation and climate in the Atacama Altiplano 22–24&amp;deg; S, J. Paleolimnol., 14, 241–252, 1995. </reference>
		<reference numeration="38" content_type="text"> Grosjean, M.: Paleohydrology of the Laguna Lejía (north Chilean Altiplano) and climatic implications for late-glacial times, Palaeogeogr. Palaeocl., 109, 89–100, 1994. </reference>
		<reference numeration="39" content_type="text"> Hansen, B. C. S., Rodbell, D. T., Seltzer, G. O., Leon, B., Young, K. R., and Abott, M.: Late-glacial and Holocene vegetational history from two sites in the western Cordillera of southwestern Ecuador, Palaeogeogr. Palaeocl., 194, 79–108, 2003. </reference>
		<reference numeration="40" content_type="text"> Hansen, B. C. S. and Rodbell, D. T.: A Late Glacial/Holocene pollen record from the eastern Andes of northern Peru, Quaternary Res., 44, 216–227, 1995. </reference>
		<reference numeration="41" content_type="text"> Hardy, D. R., Vuille, M., and Bradley, R. S.: Variability of snow accumulation an isotopic composition on Nevado Samja, Bolivia, J. Geophys. Res., 108(D22), 4693, doi:10.1029/2003JD003623, 2003. </reference>
		<reference numeration="42" content_type="text"> Hastenrath, S.: Past glaciation in the tropics, Quaternary Sci. Rev., 28, 790–798, 2009. </reference>
		<reference numeration="43" content_type="text"> Haug, G. H., Hughen, K. A., Sigman, D. M., Peterson, L. C., and Röhl, U.: Southward migration of the Intertropical Convergence Zone through the Holocene, Science, 293, 1304–1308, 2001. </reference>
		<reference numeration="44" content_type="text"> Heine, K. and Heine, J. T.: Late Glacial fluctuations: Glacier retreat during Younger Dryas time, Arctic Alpine Res., 28, 496–501, 1996. </reference>
		<reference numeration="45" content_type="text"> Henning, I. and Henning, D.: Die klimatologische Wasserbilanz der Kontinente, Münstersche Geographische Arbeiten, 19, Ferdinand Schöningh Verlag, Paderborn, 83~pp., 1984. </reference>
		<reference numeration="46" content_type="text"> Hoffmann, G., Ramirez, E., Taupin, J. D., Francou, B., Ribstein, P., Delmas, R., Dürr, H., Gallaire, R., Simões, J., Schotterer, U., Stievenard, M., and Werner, M.: Coherent isotope history of Andean ice cores over the last century, Geophys. Res. Lett., 30, 1179, doi:10.1029/2002GL014870, 2003. </reference>
		<reference numeration="47" content_type="text"> Jordan, E., Ungerechts, L., Cáceres, B., Peñafiel, A., and Francou, B.: Estimation by photogrammetry of the glacier recession on the Cotopaxi volcano (Ecuador) between 1956 and 1997, Hydrolog. Sci. J., 50, 959–961, 2005. </reference>
		<reference numeration="48" content_type="text"> Koutavas, A., Lynch-Stieglitz, J., Marchitto Jr., T. M., and Sachs, J. P.: El Niño-like pattern in ice age tropical Pacific sea surface temperature, Science, 297, 226–230, 2002. </reference>
		<reference numeration="49" content_type="text"> Kull, C. and Grosjean, M.: Albedo changes, Milankovitch forcing, and late Quaternary climate changes in the central Andes, Clim. Dyn., 14, 871–881, 1998. </reference>
		<reference numeration="50" content_type="text"> Kull, C., Imhof, S., Grosjean, M., Zech, R., and Veit, H.: Late Pleistocene glaciation in the Central Andes:~temperature versus humidity control - A case study from the eastern Bolivian Andes (17&amp;deg; S) and regional synthesis, Global Planet. Change, 60, 148–164, 2008. </reference>
		<reference numeration="51" content_type="text"> Latorre, C., Betancourt, J. L., Rylander, K. A., Quade, J., and Matthei, O.: A vegetation history from the arid prepuna of northern Chile (22–23&amp;deg; S) over the last 13500 years, Palaeogeogr. Palaeocl., 194, 223–246, 2003. </reference>
		<reference numeration="52" content_type="text"> Latorre, C.: Late Quaternary vegetation and climate history of a perennial river canyon in the Río Salado basin (22\r S) of Northern Chile, Quaternary Res., 65, 450–466, 2006. </reference>
		<reference numeration="53" content_type="text"> Lea, D. W., Pak, D. K., and Spero, H. J.: Climate impact of late Quaternary equatorial Pacific sea surface temperature variations, Science, 289, 1719–1724, 2000. </reference>
		<reference numeration="54" content_type="text"> Liu, Z., Kutzbach, J., and Wu, L.: Modeling climate shift of El Nino variability in the Holocene, Geophys. Res. Lett., 27, 2265–2268, 2000. </reference>
		<reference numeration="55" content_type="text"> Maldonado, A., Betancourt, J. L., Latorre, C., and Villagran, C.: Pollen analyses from a 50000-yr rodent midden series in the southern Atacama Desert (25&amp;deg;30´ S), J. Quaternary Sci., 20, 493–507, 2005. </reference>
		<reference numeration="56" content_type="text"> Moy, C. M., Seitzer, G. O., Rodbell, D. T., and Anderson, D. M.: Variability of El Niño/Southern Oscillation activity at millennial timescales during the Holocene epoch, Nature, 420, 162–165, 2002. </reference>
		<reference numeration="57" content_type="text"> Niemann, H. and Behling, H.: Late Quaternary vegetation, climate and fire dynamics inferred from the El Tiro record in the southeastern Ecuadorian Andes, J. Quaternary Sci., 23, 203–212, doi:10.1002/jqs.1134, 2008. </reference>
		<reference numeration="58" content_type="text"> Otto-Bliesner, B. L.: El Niño/La Niña and Sahel precipitation during the Holocene, Geophys. Res. Lett., 26, 87–90, 1999. </reference>
		<reference numeration="59" content_type="text"> Paduano, G. M., Bush, M. B., Baker, P. A., Fritz, S. C., and Seltzer, G. O.: A vegetation and fire history of Lake Titicaca since the Last Glacial Maximum, Palaeogeogr. Palaeocl., 194, 259–279, 2003. </reference>
		<reference numeration="60" content_type="text"> Porter, S. C.: Snowline depression in the tropics during the Last Glaciation, Quaternary Sci. Rev., 20, 1067–1091, 2001. </reference>
		<reference numeration="61" content_type="text"> Poussart, P. F., Evans, M. N., and Schrag, D. P.: Resolving seasonality in tropical trees: multi-decade, high-resolution oxygen and carbon isotope records from Indonesia and Thailand, Earth Planet Sc. Lett., 218, 301–316, 2004. </reference>
		<reference numeration="62" content_type="text"> Quinn, W. H. and Neal, V. T.: The historical record of El Niño events, in: Climate since AD 1500, edited by: Bradley, R. S. and Jones, P. D., Routledge, London and New York, 623–648, 1992. </reference>
		<reference numeration="63" content_type="text"> Rech, J. A., Quade, J., and Betancourt, J. L.: Late Quaternary paleohydrology of the ventral Atacama Desert (lat 22&amp;deg;–24&amp;deg; S), Chile, GSA Bulletin, 114, 334–348, 2002. </reference>
		<reference numeration="64" content_type="text"> Rein, B., Lückge, A., and Sirocko, F.: A major Holocene ENSO anomaly during the Medieval period, Geophys. Res. Lett., 31, L17211, doi:10.1029/2004GL020161, 2004. </reference>
		<reference numeration="65" content_type="text"> Rodbell, D. T., Seltzer, G. O., Anderson, D. M., Abbott, M. B., Enfield, D. B., and Newman, J. H.: An ~15000-year record of El Niño-driven alluviation in southwestern Ecuador, Science, 283, 516–520, 1999. </reference>
		<reference numeration="66" content_type="text"> Rodriguez, R., Mabres, A., Luckman, B., Evans, M., Masiokas, M., and Ektvedt, T. M.: &quot;El Niño&quot; events recorded in dry-forest species of the lowlands of northwest Peru, Dendrochronologia, 22, 181–186, 2005. </reference>
		<reference numeration="67" content_type="text"> Sandweiss, D. H., Richardson III, J. B., Reitz, E. J., Rollins, H. B., and Maasch, K. A.: Geoarchaeological evidence from Peru for a 5000 years B.P. onset of El Niño, Science, 273, 1531–1533, 1996. </reference>
		<reference numeration="68" content_type="text"> Seltzer, G. O., Rodbell, D. T., Baker, P. A., Fritz, S. C., Tapia, P. M., Rowe, H. D., and Dunbar, R. B.: Early warming of tropical South America at the last glacial-interglacial transition, Science, 296, 1685–1986, 2002. </reference>
		<reference numeration="69" content_type="text"> Servant, M. and Servant-Vildary, S.: Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes, Palaeogeogr. Palaeocl., 194, 187–206, 2003. </reference>
		<reference numeration="70" content_type="text"> Stahle, D. W., D&apos;Arrigo, R. D., Krusic, P. J., Cleaveland, M. K., Cook, E. R., Allan, R. J., Cole, J., Dunbar, R. B., Therrell, M. D., Gay, D. A., Moore, M. D., Stokes, M. A., Burns, B. T., Villanueva-Diaz, J., and Thompson, L. G.: Experimental dendroclimatic reconstruction of the southern oscillation, B. Am. Meteorol. Soc., 79, 2137–2152, 1998. </reference>
		<reference numeration="71" content_type="text"> Stokes, M. A. and Smiley, T. L.: An Introduction to Tree-Ring Dating, The University of Chicago Press: Chicago, London, p 73, 1968. </reference>
		<reference numeration="72" content_type="text"> Stuut, J.-B. W., and Lamy, F.: Climate variability at the southern boundaries of the Namib (southwestern Africa) and Atacama (northern Chile) coastal deserts during the last 120000 yr., Quaternary Res., 62, 301–309, 2004. </reference>
		<reference numeration="73" content_type="text"> Sylvestre, F., Servant, M., Servant-Vildary, S., Causse, C., Fournier, M., and Ybert, J.-P.: Lake-level chronology on the southern Bolivian Altiplano (18&amp;deg;–23&amp;deg; S) during late-glacial time and the early Holocene, Quaternary Res., 51, 54–66, 1999. </reference>
		<reference numeration="74" content_type="text"> Thompson, L. G., Mosley-Thompson, E., Davis, M. E., Lin, P. N., Henderson, K., and Mashiotta, T. A.: Tropical glaciers and ice core evidence of climate change on annual to millennial time scales, Climatic Change, 59, 137–155, 2003. </reference>
		<reference numeration="75" content_type="text"> Thompson, L. G., Mosley-Thompson, E., and Henderson, K. A.: Ice core palaeoclimate records in tropical South America since the last glacial maximum, J. Quaternary Sci., 15, 377–394, 2000. </reference>
		<reference numeration="76" content_type="text"> Trenberth, K. E. and Caron, J. M.: The Southern Oscillation revisited: sea level pressures, surface temperatures, and precipitation, J. Climate, 13, 4358–4365, 2000. </reference>
		<reference numeration="77" content_type="text"> Tudhope, A. W., Chilcott, C. P., McCulloch, M. T., Cook, E., Chappell, J., Ellam, R. M., Lea, D. W., Lough, J. M., and Shimmield, G. B.: Variability in the El Niño-Southern Oscillation through a glacial-interglacial cycle, Science, 291, 1511–1517, 2001. </reference>
		<reference numeration="78" content_type="text"> Valero-Garcés, B. L., Grosejean, M., Schwalb, A., Geyh, M., Messerli, B., and Kelts, K.: Limnogeology of Laguna Miscanti: evidence for mid to late Holocene moisture changes in the Atacama Altiplano (Northern Chile), J. Paleolimnol., 16, 1–21, 1996. </reference>
		<reference numeration="79" content_type="text"> van der Hammen, T.: The Pleistocene changes of vegetation and climate in tropical South America, J. Biogeogr., 1, 3–26, 1974. </reference>
		<reference numeration="80" content_type="text"> van Geel, B., Heusser, C. J., Renssen, H., and Schuurmans C. J. E.: Climatic change in Chile at around 2700 BP and global evidence for solar forcing: a hypothesis, Holocene, 10, 659–664, 2000. </reference>
		<reference numeration="81" content_type="text"> Vetter, R. E.: Growth periodicities and age of Amazonian tree species. Methods for their determination, in: Dendrocronología in América Latina, edited by: Roig, F. A., EDIUNC, Mendoza, 133–155, 2000. </reference>
		<reference numeration="82" content_type="text"> Villalba, R.: Tree-ring and glacial evidence for the medieval Warm Epoch and the Little Ice Age in southern South America, Climatic Change, 26, 183–197, 1994. </reference>
		<reference numeration="83" content_type="text"> Volland-Voigt, F., Bräuning, A., and Ganzhi, O.: High-resolution dendrometer measurements in a tropical mountain rainforest and a dry forest in South Ecuador, TRACE – Tree Rings in Archaeology, Climatology and Ecology, 7, 85–88, 2009. </reference>
		<reference numeration="84" content_type="text"> von Schnakenburg, P., Bräuning, A., and Helle, G.: Detecting annual growth rhythms from high-frequency densitometry and carbon isotopes in tropical mountain rain forest trees in southern Ecuador. TRACE – Tree Rings in Archaeology, Climatology and Ecology, 6, 96–99, 2008. </reference>
		<reference numeration="85" content_type="text"> Wells, L.: Holocene history of the El Niño phenomenon as recorded in flood sediments of northern coastal Peru, Geology, 18, 1134–1137, 1990. </reference>
		<reference numeration="86" content_type="text"> Wigley, T., Briffa, K. R., and Jones, P. D.: On the average value of correlated time series, with applications in dendroclimatology and hydrometeorology, J. Appl. Meteorol., 23, 201–213, 1984. </reference>
		<reference numeration="87" content_type="text"> Worbes, M.: One hundred years of tree-ring research in the tropics: a brief history and an outlook to future challenges, Dendrochronologia, 20, 217–231, 2002. </reference>
		<reference numeration="88" content_type="text"> Zech, R., May, J.-H., Kull, C., Ilgner, J., Kubik, P. W., and Veit, H.: Timing of the Late Quaternary glaciation in the Andes from 15 to 40&amp;deg; S, J. Quaternary Sci., 23, 635–674, 2008. </reference>
	</references>
</article>

