What is it about?
The Bohai Sea, a semienclosed and shallow‐water inland sea of China, was subject to stepwise decline in summertime bottom water dissolved oxygen after the launch of the China “Reform and Openness” policy in 1978. Associated with the seasonal DO shortage, the metabolism‐enhanced CO2 accumulation in subsurface waters in summer resulted in critical aragonite saturation states of close to or even less than 1.5, threatening calcifiers with potentially severe consequences for valuable shellfish fisheries.
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Why is it important?
This study demonstrated a simple procedure in the projection of future coastal carbonate mineral suppression under the combined stresses of global atmospheric CO2 intrusion and the regional metabolism enhancement. This approach may have applicability in many other shallow‐water coastal oceans with seasonal stratification and eutrophication‐related dissolved oxygen depletion.
Perspectives
The Bohai Sea is at its early stage along a critical path of deoxygenation, due to the combined effect of increasing human activities (such as fertilizer use, sewage discharge, and marine aquaculture) and the climate change (affecting the stratification).
Dr Wei-Dong Zhai
Shandong University
Read the Original
This page is a summary of: Emergence of Summertime Hypoxia and Concurrent Carbonate Mineral Suppression in the Central Bohai Sea, China, Journal of Geophysical Research Biogeosciences, September 2019, American Geophysical Union (AGU),
DOI: 10.1029/2019jg005120.
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