Holocene environmental changes in the fuegian forest and steppe, Argentina

CORONATO, ANDREA; BORROMEI, ANA MARÍA; PONCE, JUAN FEDERICO; CANDEL, SOLEDAD; MUSOTTO, LORENA; FERNÁNDEZ, MARILÉN; LAPRIDA, CECILIA; MEHL, ADRIANA; MONTES, ALEJANDRO; SAN MARTÍN, CRISTINA; SAVORETTI, ADOLFINA; CUSMINSKY, GABRIELA; GORDILLO, SANDRA; ORGEIRA, MARÍA JULIA; LÓPEZ, RAMIRO; ALLI, PAMELA; QUIROGA, DIEGO

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2022 vol. 119

0895-9811

Environmental changes were reconstructed from a multiproxy synthesis of over 30 localities from the Isla Grandede Tierra del Fuego and Isla de los Estados, southernmost South America. At a local scale, the results from themountain forest and gently undulating steppe areas were integrated as well as those from the marine environmentsof the Beagle Channel and the Atlantic coasts. At a regional scale, the results were integrated with thosepublished for the southernmost Andean and Extra-Andean Patagonia and the Antarctic Peninsula. This studyfocuses on the environmental evolution during the Late Glacial-Holocene transition, the Middle to Late Holocenetransgressive-regressive hemicycle and wet-dry oscillations, the Medieval Climate Anomaly, the Little Ice Age,the tephra inputs from the Patagonian Andes, and the recent climatic warming. Most paleoenvironmentalchanges are related to variations in the latitudinal position and intensity of the Southern Westerly Winds (SWW)while others are associated with astronomical or endogenous forcings. At a strong intensity of the SWW, a greatercontribution of humidity to the forest areas and an increase in the rainfall gradient create windy and aridconditions in the steppe. At a weak intensity of the SWW, lower humidity input in the forest areas and theadvection of air masses from the Atlantic Ocean promoted humid and slightly windy conditions in the steppe.Similar environmental trends are observed between terrestrial and marine environments in the center and southof Tierra del Fuego, Isla de los Estados and the Antarctic Peninsula, and between the Fuegian steppe and Extra-Andean Patagonia. The paleoclimatic evidence reveal high environmental variability in the last 10,000 years forthis sector of the Southern Hemisphere.