Analysis of Occurrence Mechanism of Hypoxic Water in the Western Interior Parts of the Ariake Sea Using a Two-layer Box Model

Seguchi, Masahiro; Koriyama, Masumi; Ishitani, Tetuhiro

doi:10.2208/proce1989.55.1016

Cited by 1 publication

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1c) near St. 3 and St. 4 (Fig. 6), ranged from 1.29 to 1.70 mg L −1 day −1 (Seguchi et al 2008). The measured R could not be strictly compared to R app , because the measured R was oxygen consumption rate in the water column.…”

Section: Analytical Results and Discussionmentioning

confidence: 94%

“…Nakayama et al (2003) and Tokunaga et al (2005) showed experimentally that the oxygen consumption due to SS plays an important role in the variation of DO concentration in the bottom layer. Moreover, Seguchi et al (2008) found that DO consumption rate in the bottom layer was closely related to POM.…”

Section: Analytical Results and Discussionmentioning

confidence: 99%

“…The oxygen consumption by suspended solids (SS) plays an important role in the formation of oxygen-deficient water in the study area (Tokunaga et al 2005). A significant correlation has been found between the oxygen consumption rate and the concentration of particulate organic matter (POM) (Seguchi et al 2008). On the other hand, the vertical diffusion coefficient in the Ariake Sea has only been studied by Yanagi and Shimomura (2006) using box model analysis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of hypoxia in the western interior parts of the Ariake Sea, Japan, using a box model

Koriyama

Seguchi

Ishitani

et al. 2010

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

To clarify the mechanism of hypoxia in the western interior parts of the Ariake Sea (WIAS), field observation data collected in the period of 1972-2004 were analyzed using a two-layer box model. Monthly averages of advection velocity, vertical diffusion coefficient (K(z)), and biochemical oxygen consumption rate (R) in WIAS were evaluated quantitatively during the above period. The estimated advection velocity comparatively corresponded to the observed residual flow pattern of bay head in summer and winter. The estimated K(z) was relatively high (0.6-5.3 cm(2) s( -1)) from September to March but lower (0.2-0.4 cm(2) s( -1)) from April to August. The estimated R ranged from 0.30 to 0.46 mg L( -1) day( -1) during May to August. In summer, the temporal variation of dissolved oxygen (DO) concentration in the lower layer was controlled largely by K ( z ) and R. Monthly variations of K(z), R, and degree of density stratification (P) in the 1970s, the 1980s, and the 1990s-early 2000s were analyzed. P, K ( z ), and R were not significantly different among the calculated periods (p = 0.93, 0.23, and 0.49). However, the variations of R in summer between the 1970s and the other calculated periods changed. DO consumption period was longer in the 1980s and the 1990s-early 2000s than in the 1970s. R in the 1980s was highest among the calculated periods. The increase in R in the 1980s was caused by the increase in organic matter load originating from red tide phytoplankton due to a decrease in the suspension feeders.

show abstract

Section: Analytical Results and Discussionmentioning

confidence: 94%

Section: Analytical Results and Discussionmentioning

confidence: 99%