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Copyright © 2013 by The Geochemical Society of Japan. physical processes (e.g., upwelling, stratification) have together controlled the atmospheric partial pressure of CO2 (pCO2 atm) (François et al., 1997). With regard to the response of pCO2 atm to global climate changes, one of the most important areas linking the atmosphere and the ocean is the Southern Ocean (François et al., 1997; Anderson et al., 2009; Sigman et al., 2010), where upwelling of deep water brings carbon from one of the world’s largest carbon reservoirs directly to the atmosphere. During glacial periods, strengthened productivity and an efficient biological pump in the North Pacific, equatorial Pacific, and Southern oceans may have contributed to low pCO2 atm values (Broecker, 1982; McElroy, 230Th-normalized fluxes of biogenic components from the central and southernmost Chilean margin over the past 22,000 years

<sup>230</sup>Th-normalized fluxes of biogenic components from the central and southernmost Chilean margin over the past 22,000 years