Identification of CO_2 disposal locations in an ocean general circulation model of the North Pacific

A basin-wide ocean general circulation model of the North Pacific is used to identify which location is more efficient for ocean CO2 sequestration in the North Pacific.Four injection depths at each one of fifteen locations are chosen.In terms of effectiveness index（EI） and escape factor（EF）,it is clear that the effectiveness increases with increasing latitude at the end of the 50 a injection period.Site-by-site differences in the EI can be over 9% for the 1 000 m injection depth in the western North Pacific at the end of 50 a of continuous injection.The difference is much larger for the 500 m injection.The difference decreases with increasing injection depth.However,the site-by-site difference is small for the injection in the eastern North Pacific.The sequestration is more efficient for the injection in the east than in the west.For the 500 m injection depth,the difference in effectiveness between the west and the east is over 10% at the end of 50 a injection period.The largest concentration of sequestered CO2 increases with increasing injection depth.For the injection in both the western and central North Pacific,the largest exchange flux always appears to be at about 42°N,150°E,whereas for the injection in the eastern area the large flux appears to be in the equatorial region（120°W）.