WOCE AMS Radiocarbon I: Pacific Ocean Results (P6, P16 and P17)

• Format: Article in Journal/Newspaper
• Language: English
• Published: Radiocarbon 1996
• Subjects: Pacific; Southern Ocean
• Online Access: https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1918

AMS radiocarbon results from the World Ocean Circulation Experiment in the Pacific Ocean show dramatic changes in the inventory and distribution of bomb-produced 14C since the time of the GEOSECS survey (8/73-6/74). Nearsurface 4C values for the eastern portion of both the northern and southern subtropical gyres decreased by 25-50%, with the change being greater in the north. Equatorial near-surface values have increased by ca. 25%. Changes in the 250-750-m depth range are dramatically different between the northern and southern basins. The intermediate and mode waters of the southern basin have increased by as much as 75%o since GEOSECS. Waters of similar density in the northern hemisphere are not exposed to the Southern Ocean circulation regime and are significantly less ventilated, showing maximum changes of ca. 50%.