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Processes Controlling the Carbonate Chemistry of Surface seawater Along the 150°E Transect in the Northwest Pacific Ocean

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Journal of Ocean University of China 2022年第6期21卷 1529-1537页

作者： MOU Liang ZHANG Honghai CHEN Zhaohui HU Yubin Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

The problem of ocean acidification caused by the increase of atmospheric carbon dioxide concentration is becoming increasingly prominent.Field observation in the northwest Pacific Ocean was carried out along the 150°E transect in November 2019.The distribution characteristics and influencing factors of the surface seawater carbonate chemistry,including dissolved inorganic carbon(DIC),total alkalinity(TA),ph,partial pressure of carbon dioxide(pCO_(2))and aragonite saturation state(Ω_(arag))were investigated.DIC and TA ranged from 1915 to 2014μmol kg^(−1)and 2243 to 2291μmol kg^(−1),respectively;DIC in general decreased with decreasing latitude,but TA had no clear latitudinal gradient.pCO_(2)values increased with the decrease of latitude and were all below the atmospheric pCO_(2)level,ranging from 332 to 387μatm.ph on the total hydrogen ion concentration scale(ph_(T))decreased with the decrease of latitude in the range of 8.044–8.110,whileΩ_(arag) increased with the decrease of latitude in the range of 2.61–3.88,suggesting that the spatial distributions of ph_(T) andΩ_(arag) were out of phase.Compared with the present,the predicted values of ph_(T) and Ω_(arag) by the end of this century would decrease remarkedly;larger declines were found in the higher ph_(T) and Ω_(arag) regions,resulting in the differences along the meridional gradient becoming smaller for bothph_(T) and Ω_(arag).

关键词： ocean acidification carbonate system aragonite saturation state seawater ph Pacific Ocean

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Projections of changes in marine environment in coastal China seas over the 21^st century based on CMIP5 models

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Journal of Oceanology and Limnology 2020年第6期38卷 1676-1691页

作者： TAN Hongjian CAI Rongshuo HUO Yunlong GUO Haixia Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China

The increases of atmospheric carbon dioxide and other greenhouse gases have caused fundamental changes to the physical and biogeochemical properties of the oceans,and it will continue to occur in the foreseeable future.Based on the outputs of nine Earth System Models from the fifth phase of the Coupled Model Intercomparison Project(CMIP5),in this study,we provided a synoptic assessment of future changes in the sea surface temperature(SST),salinity,dissolved oxygen(DO),seawater ph,and marine net primary productivity(NPP)in the coastal China seas over the 21st century.The results show that the mid-high latitude areas of the coastal China seas(East China Seas(ECS),including the Bohai Sea,Yellow Sea,and East China Sea)will be simultaneously exposed to enhanced warming,deoxygenation,acidification,and decreasing NPP as a consequence of increasing greenhouse gas emissions.The magnitudes of the changes will increase as the greenhouse gas concentrations increase.Under the high emission scenario(Representative Concentration Pathway 8.5),the ECS will experience an SST increase of 3.24±1.23℃,a DO concentration decrease of 10.90±3.92μmol/L(decrease of 6.3%),a ph decline of 0.36±0.02,and a NPP reduction of-17.7±6.2 mg/(m2·d)(decrease of 12.9%)relative to the current levels(1980-2005)by the end of this century.The co-occurrence of these changes and their cascade effects are expected to induce considerable biological and ecological responses,thereby making the ECS among the most vulnerable ocean areas to future climate change.Despite high uncertainties,our results have important implications for regional marine assessments.

关键词： Coupled Model Intercomparison Project(CMIP5) sea surface temperature(SST) dissolved oxygen(DO) seawater ph net primary productivity

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