Upwelling signals in radiocarbon from early 20th-century Peruvian bay scallop ( Argopecten purpuratus ) shells
2009; Cambridge University Press; Volume: 72; Issue: 3 Linguagem: Inglês
10.1016/j.yqres.2009.07.008
ISSN1096-0287
AutoresKevin B. Jones, Gregory Hodgins, Miguel F. Etayo-Cadavid, C. Fred T. Andrus,
Tópico(s)Pacific and Southeast Asian Studies
ResumoAbstract We quantified Δ 14 C, δ 18 O, and δ 13 C cycles along ontogeny within four bay scallop ( Argopecten purpuratus ) shells collected from Callao Bay, Salaverry, and Sechura Bay, Peru following the 1907–1908 non-El Niño years and the 1925–1926 El Niño. Δ 14 C and δ 13 C generally covary; Δ 14 C and δ 18 O vary inversely. Simultaneous decreases in Δ 14 C and increases in δ 18 O in non-El Niño shells are followed by constant Δ 14 C and gradually decreasing δ 18 O, which we interpret as evidence for discrete marine upwelling events followed by warming of the initially cold upwelled water. Upwelling changes from El Niño events are detectable with difficulty in mollusk shell Δ 14 C.
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