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Paleoproductivity evolution off central Chile from the Last Glacial Maximum to the Early Holocene
- Source :
-
Quaternary Research . May2006, Vol. 65 Issue 3, p519-525. 7p. - Publication Year :
- 2006
-
Abstract
- 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. [Copyright &y& Elsevier]
- Subjects :
- *GLACIAL climates
*PALEOCLIMATOLOGY
*PRESSURE
*COLD (Temperature)
Subjects
Details
- Language :
- English
- ISSN :
- 00335894
- Volume :
- 65
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Quaternary Research
- Publication Type :
- Academic Journal
- Accession number :
- 20831123
- Full Text :
- https://doi.org/10.1016/j.yqres.2005.07.003