Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS

Pavel P. Povinec, Takafumi Aramaki, George S. Burr, A. J Timothy Jull, Laval Liong Wee Kwong, Orihiko Togawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In the framework of the Worldwide Marine Radioactivity Studies (WOMARS) project, water profile samples for radiocarbon measurements were taken during the IAEA'97 cruise at 10 stations in the southwestern North Pacific Ocean. While 14C concentrations were rapidly decreasing from the surface (Δ14C about 100‰) down to about 800 m at all visited stations (Δ14C about-200‰), the concentrations below 1000 m were almost constant. Some stations were in proximity to the GEOSECS stations sampled in 1973; thus, 14C profiles could be compared after a 24-yr interval. Generally, 14C concentrations had decreased in surface waters (by 50-80°‰) and increased (by about the same amount) in intermediate waters when compared with GEOSECS data. In deep waters (below 1000 m), the observed 14C concentrations were similar to GEOSECS values. The bomb-produced 14C inventory had increased by more than 20% over the 24 yr from 1973 to 1997 and was estimated to be about (32 ± 5) 1012 atom m-2, with an annual 14C flux of (1.3 ± 0.3) 1012 atom m-2 yr-1. The results suggest that bomb-produced 14C has been advected northwards by the Kuroshio Current and the Kuroshio Extension and stored in the intermediate layer as North Pacific Intermediate Water.

Original languageEnglish (US)
Pages (from-to)583-594
Number of pages12
JournalRadiocarbon
Volume46
Issue number2
StatePublished - 2004

Fingerprint

water column
Water
intermediate water
Atoms
Radioactivity
Surface waters
radioactivity
deep water
Fluxes
surface water
North Pacific Ocean
station
Pacific Ocean
Radiocarbon
water
Intermediate

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Povinec, P. P., Aramaki, T., Burr, G. S., Jull, A. J. T., Kwong, L. L. W., & Togawa, O. (2004). Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS. Radiocarbon, 46(2), 583-594.

Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS. / Povinec, Pavel P.; Aramaki, Takafumi; Burr, George S.; Jull, A. J Timothy; Kwong, Laval Liong Wee; Togawa, Orihiko.

In: Radiocarbon, Vol. 46, No. 2, 2004, p. 583-594.

Research output: Contribution to journalArticle

Povinec, PP, Aramaki, T, Burr, GS, Jull, AJT, Kwong, LLW & Togawa, O 2004, 'Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS', Radiocarbon, vol. 46, no. 2, pp. 583-594.
Povinec, Pavel P. ; Aramaki, Takafumi ; Burr, George S. ; Jull, A. J Timothy ; Kwong, Laval Liong Wee ; Togawa, Orihiko. / Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS. In: Radiocarbon. 2004 ; Vol. 46, No. 2. pp. 583-594.
@article{c9e210e04091459baee576fb50e2c9d7,
title = "Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS",
abstract = "In the framework of the Worldwide Marine Radioactivity Studies (WOMARS) project, water profile samples for radiocarbon measurements were taken during the IAEA'97 cruise at 10 stations in the southwestern North Pacific Ocean. While 14C concentrations were rapidly decreasing from the surface (Δ14C about 100‰) down to about 800 m at all visited stations (Δ14C about-200‰), the concentrations below 1000 m were almost constant. Some stations were in proximity to the GEOSECS stations sampled in 1973; thus, 14C profiles could be compared after a 24-yr interval. Generally, 14C concentrations had decreased in surface waters (by 50-80°‰) and increased (by about the same amount) in intermediate waters when compared with GEOSECS data. In deep waters (below 1000 m), the observed 14C concentrations were similar to GEOSECS values. The bomb-produced 14C inventory had increased by more than 20{\%} over the 24 yr from 1973 to 1997 and was estimated to be about (32 ± 5) 1012 atom m-2, with an annual 14C flux of (1.3 ± 0.3) 1012 atom m-2 yr-1. The results suggest that bomb-produced 14C has been advected northwards by the Kuroshio Current and the Kuroshio Extension and stored in the intermediate layer as North Pacific Intermediate Water.",
author = "Povinec, {Pavel P.} and Takafumi Aramaki and Burr, {George S.} and Jull, {A. J Timothy} and Kwong, {Laval Liong Wee} and Orihiko Togawa",
year = "2004",
language = "English (US)",
volume = "46",
pages = "583--594",
journal = "Radiocarbon",
issn = "0033-8222",
publisher = "University of Arizona",
number = "2",

}

TY - JOUR

T1 - Radiocarbon in the water column of the southwestern North Pacific Ocean - 24 Years after GEOSECS

AU - Povinec, Pavel P.

AU - Aramaki, Takafumi

AU - Burr, George S.

AU - Jull, A. J Timothy

AU - Kwong, Laval Liong Wee

AU - Togawa, Orihiko

PY - 2004

Y1 - 2004

N2 - In the framework of the Worldwide Marine Radioactivity Studies (WOMARS) project, water profile samples for radiocarbon measurements were taken during the IAEA'97 cruise at 10 stations in the southwestern North Pacific Ocean. While 14C concentrations were rapidly decreasing from the surface (Δ14C about 100‰) down to about 800 m at all visited stations (Δ14C about-200‰), the concentrations below 1000 m were almost constant. Some stations were in proximity to the GEOSECS stations sampled in 1973; thus, 14C profiles could be compared after a 24-yr interval. Generally, 14C concentrations had decreased in surface waters (by 50-80°‰) and increased (by about the same amount) in intermediate waters when compared with GEOSECS data. In deep waters (below 1000 m), the observed 14C concentrations were similar to GEOSECS values. The bomb-produced 14C inventory had increased by more than 20% over the 24 yr from 1973 to 1997 and was estimated to be about (32 ± 5) 1012 atom m-2, with an annual 14C flux of (1.3 ± 0.3) 1012 atom m-2 yr-1. The results suggest that bomb-produced 14C has been advected northwards by the Kuroshio Current and the Kuroshio Extension and stored in the intermediate layer as North Pacific Intermediate Water.

AB - In the framework of the Worldwide Marine Radioactivity Studies (WOMARS) project, water profile samples for radiocarbon measurements were taken during the IAEA'97 cruise at 10 stations in the southwestern North Pacific Ocean. While 14C concentrations were rapidly decreasing from the surface (Δ14C about 100‰) down to about 800 m at all visited stations (Δ14C about-200‰), the concentrations below 1000 m were almost constant. Some stations were in proximity to the GEOSECS stations sampled in 1973; thus, 14C profiles could be compared after a 24-yr interval. Generally, 14C concentrations had decreased in surface waters (by 50-80°‰) and increased (by about the same amount) in intermediate waters when compared with GEOSECS data. In deep waters (below 1000 m), the observed 14C concentrations were similar to GEOSECS values. The bomb-produced 14C inventory had increased by more than 20% over the 24 yr from 1973 to 1997 and was estimated to be about (32 ± 5) 1012 atom m-2, with an annual 14C flux of (1.3 ± 0.3) 1012 atom m-2 yr-1. The results suggest that bomb-produced 14C has been advected northwards by the Kuroshio Current and the Kuroshio Extension and stored in the intermediate layer as North Pacific Intermediate Water.

UR - http://www.scopus.com/inward/record.url?scp=4644247648&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4644247648&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:4644247648

VL - 46

SP - 583

EP - 594

JO - Radiocarbon

JF - Radiocarbon

SN - 0033-8222

IS - 2

ER -