1. Application of a Two-Layer Box Model to Dissolved Oxygen Budget in Uranouchi Bay
- Author
-
Haruyasu Kimura and Yukihiro Munekage
- Subjects
Hydrology ,geography ,Box model ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,chemistry.chemical_element ,Inlet ,01 natural sciences ,Oxygen ,Anoxic waters ,010305 fluids & plasmas ,chemistry ,0103 physical sciences ,Spring (hydrology) ,Phytoplankton ,Respiration ,General Earth and Planetary Sciences ,Environmental science ,Bay ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
An estimation method for dissolved oxygen (DO) budget is described and seasonal variations of the DO budgets in Uranouchi Bay, a typical semi-enclosed inlet, are estimated. The formation mechanism of anoxic water mass in the inlet is investigated on the basis of the results.In the upper layer, although phytoplankton produces abundant oxygen from spring to fall, 60% of the oxygen produced escapes to the air above. In the lower layer, biological-chemical DO consumption of water accounts for 70% of the total DO removal. The DO consumption by respiration of cultured fish increases to 20% of the total DO removal in the fall. The DO production by phytoplankton accounts for 80% of the total DO supply in spring and fall, but for only 25% in summer. The DO transport through tidal exchange from the outside of the bay increases to 50% in summer. The DO transport through vertical mixing decreases to 7% of the total in July and accounts for 20 to 45% in spring and fall.The anoxic water mass in the lower layer ...
- Published
- 1992