Daily Variations in Nutrient Concentrations of Seawater at 321 m Depth in Toyama Bay, Japan Sea
Source: Journal of Oceanography, Volume 56, Number 5, October 2000 , pp. 553-558(6)
Abstract:Nutrient concentrations (nitrate + nitrite, phosphate and silicate) in deep seawater (321 m depth) of Toyama Bay, Japan, were measured from August 1996 to July 1997 to determine the magnitude of daily variations. Significant daily variations were observed; concentrations ranged from 4.42 to 22.4 µM for nitrate + nitrite, from 0.86 to 1.98 µM for phosphate, and from 9.91 to 47.7 µM for silicate, respectively. However, there were not significant relationships between nutrient concentrations and water temperature, or between nutrients and salinity. Since temperature and salinity in the >300 m depth layer were constant through the year, the results suggest that there may be water masses with different nutrient concentrations in the deep layers (at about 320 m depth) of the bay, and a horizontal advection of these water masses may be responsible for the observed daily variations.
Document Type: Regular Paper
Affiliations: 1: Shohoku College, 248 Nurumizu, Atsugi, Kanagawa 243-8501, Japan E-mail: firstname.lastname@example.org 2: Toyama Prefectural Fisheries Research Institute, 364 Takatuka, Namerikawa, Toyama 936-8536, Japan 3: Department of Ocean Sciences, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan
Publication date: October 1, 2000