NDLI: Helium isotopes of seawater in the Japan Sea

Content Provider	Springer Nature Link
Author	Takahata, Naoto Sa, Yuji Horiguchi, Keika Shirai, Kotaro Gamo, Toshitaka
Copyright Year	2008
Abstract	We have collected fifty-five seawater samples at seven stations at various depths in the Yamato and Japan Basins of the Japan Sea and measured their helium isotopic ratios. The $^{3}$He/$^{4}$He ratios vary from 0.997 R$_{atm}$ to 1.085 R$_{atm}$ where R$_{atm}$ is the atmospheric ratio. The maximum $^{3}$He excesses about 8%, are observed at mid-depth (1000 m), and these values are significantly lower than those observed in deep Pacific waters. This implies that mantle-derived helium in deep Pacific water cannot enter the Japan Sea since it is an almost landlocked marginal sea. The observed 8% excess $^{3}$He may be attributable to the decay product of tritium. Slightly higher $^{3}$He/$^{4}$He ratios in the Bottom Water were observed in the Yamato Basin than in the Japan Basin. The ventilation ages of seawater shallower than 1000 m are calculated as about 5 to 20 years, which is consistent with the CFC ages reported in the literature. There is a positive correlation between the apparent oxygen utilization and $^{3}$H-$^{3}$He ages. The estimated oxygen utilization rate from the correlation in a layer between 500 m and 1000 m is about 3 µmol/kg/yr, which is similar to that in the eastern subtropical North Atlantic.
Starting Page	293
Ending Page	301
Page Count	9
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	64
Issue Number	2
e-ISSN	1573868X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{3}$He/$^{4}$He ratios deep circulation Japan Sea $^{3}$H-$^{3}$He age oxygen utilization rate Oceanography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Oceanography

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