Paleoproductivity evolution off central Chile from the Last Glacial Maximum to the Early Holocene

• Published in: Quaternary Research
• Main Authors: Romero, Oscar E., Kim, Jung-Hyn, Hebbeln, Dierk
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2006
• Subjects: Antarctic; The Antarctic; Antarc*
• Online Access: http://dx.doi.org/10.1016/j.yqres.2005.07.003; http://api.elsevier.com/content/article/PII:S0033589405000992?httpAccept=text/xml; http://api.elsevier.com/content/article/PII:S0033589405000992?httpAccept=text/plain; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400027666

Abstract A geochemical and paleontological reconstruction of paleoproductivity, upwelling intensity and sea surface temperature (SST) off central Chile at 35°S (GeoB3359-3) reveals marked changes from the Last Glacial Maximum (LGM) through the Early Holocene. Surface-water productivity was determined by the interaction between the atmospheric (the Southern Westerlies) and oceanographic (the Antarctic Circumpolar Current, ACC) systems from the LGM through early Termination I (TI). The northward shift of the climate zones during the LGM brought the ACC, as the main macronutrient source, closer to the GeoB3359-3, SST lowered, and surface water productivity and accumulation rates of biogenic components enhanced. With the poleward return of the Southern Westerlies and the ACC, the subtropical high-pressure system became the dominant atmospheric component southward till 35°S during the late TI and Early Holocene and caused surface water productivity to increase through enhanced upwelling.