9:45 AM - 10:00 AM
[AOS25-04] Ocean acidification detected in coastal water around Japan
Keywords: Ocean acidification , pH , Coastal water in Japan
Apparent 368 acidification and 18 alkalization trends were detected. Among them, 78 acidification and 13 alkalization trends were statistically significant. Progressing speed of ocean acidification in coastal waters is averagely at -0.0015 pH/yr, which is comparable to the estimates at the other fixed monitoring stations in open ocean, such as JMA 137E line, BATS and HOT program stations. Some industrial port sites including Ishinomaki in Miyagi, Tomakomai in Hokkaido and Tokyo Bay in Tokyo prefectures show 10 times as fast progressing speed as the average. We would clarify the mechanisms of the differences among local regions, and possible influences on marine ecosystems, in future study.
Our talk will also provide a tendency of ocean acidification/alkalization in each prefecture, and a diagnostic estimation of aragonite saturation rate (ΩAR) to see an influence on crustacean in present.