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Migration area of the Tsushima Warm Current Branches within the Sea of Japan: Implications from transport of 228Ra.
- Source :
-
Continental Shelf Research . Jul2017, Vol. 143, p167-174. 8p. - Publication Year :
- 2017
-
Abstract
- We investigated lateral profiles of 228 Ra (half-life; 5.75 years) activity and 228 Ra/ 226 Ra (1600 years) activity ratio using 241 surface water samples collected in/around the Sea of Japan and the East China Sea (ECS) during June–October of 2009–2014. In the ECS, the 228 Ra/ 226 Ra ratio in the surface waters exhibited markedly wide variation (<0.05–3.5) in June, predominantly reflecting the mixing between the 228 Ra-rich continental shelf water and the 228 Ra-depleted Kuroshio Current water. In July, the surface waters of the central Sea of Japan (135–138°E) became separated into three currents: the Offshore Branch of the Tsushima Warm Current (OBTWC) ( 228 Ra/ 226 Ra =0.7–1.2) at 39–41°N, the Coastal Branch of the TWC (CBTWC) (~0.7) on the southern side, and sub-Arctic Current (~0.7) on the northern side. From the central to northeastern Sea of Japan, the 228 Ra/ 226 Ra ratio at the surface (0.8–1.0) was within a range between that of the CBTWC and OBTWC. The fraction of continental shelf water in the CBTWC, OBTWC, and in their combined current was estimated to be 11–16%, ~8%, and 10–11%, respectively. [ABSTRACT FROM AUTHOR]
- Subjects :
- *RADIUM isotopes
*OCEANOGRAPHY
*SEAWATER salinity
*MARINE ecology
TSUSHIMA Current
Subjects
Details
- Language :
- English
- ISSN :
- 02784343
- Volume :
- 143
- Database :
- Academic Search Index
- Journal :
- Continental Shelf Research
- Publication Type :
- Academic Journal
- Accession number :
- 124142450
- Full Text :
- https://doi.org/10.1016/j.csr.2016.08.010