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Trace of the recent deep water formation in the Japan Sea Deduced from historical 137 Cs data
Author(s) -
Miyao Takashi,
Hirose Katsumi,
Aoyama Michio,
Igarashi Yasuhito
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011406
Subject(s) - deep water , bay , geology , surface water , spatial distribution , oceanography , period (music) , deep sea , surface layer , mineralogy , environmental science , layer (electronics) , chemistry , physics , remote sensing , organic chemistry , environmental engineering , acoustics
Historical 137 Cs data obtained in the Japan Sea were statistically analyzed. 137 Cs concentrations in the upper 200 m layer decreased almost monotonously after 1970's, while those in the deeper layers below 1500 m depth sharply increased during the period of 1985–1995, accompanied with the increase of the 137 Cs inventory. It follows that considerable amount of 137 Cs‐rich surface water was conveyed into the deep layers after 1985, suggesting that the deep water formation occurred. The spatial distribution of 137 Cs in the deep layers in 1990's indicates that the recent deep water formation occurred in the northwestern area of the Japan Sea, around Peter the Great Bay.