{"id":28473,"date":"2023-02-10T08:53:37","date_gmt":"2023-02-10T00:53:37","guid":{"rendered":"https:\/\/www.oc.ntu.edu.tw\/oceng\/?p=17112"},"modified":"2023-08-02T05:01:32","modified_gmt":"2023-08-01T21:01:32","slug":"rapid-increase-of-pco2-and-seawater-acidification-along-kuroshio-of-the-east-china-sea","status":"publish","type":"post","link":"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/28473\/","title":{"rendered":"Rapid increase of pCO2 and seawater acidification along Kuroshio of the East China Sea"},"content":{"rendered":"

<\/p>\n

Shou-En Tsao<\/strong>, Chun-Mao Tseng*<\/sup><\/strong><\/strong><\/p>\n

\u00a0<\/sup><\/strong><\/p>\n

Since the industrial revolution, the level of atmospheric carbon dioxide (CO2<\/sub>) has increased by ~50% due to human activities in the past centuries which accelerated global change and a warming threat to the earth. Meanwhile, the ocean has absorbed around 30% of the emitted anthropogenic carbon through the air-sea exchange and has played a major buffering role in slowing down the accumulation of atmospheric CO2<\/sub> and mitigating climate change. The uptake of CO2<\/sub> has led to ocean acidification, referring to the decline of pH through the years, which enhances CaCO3<\/sub> dissolution and poses a threat to marine life. Thus, understanding the long-term changes in ocean carbonate chemistry under anthropogenic influence is greatly important.<\/p>\n

 <\/p>\n

In this study, we explored the trends of seawater acidification and the increased partial pressure of carbon dioxide (pCO2<\/sub>) in the western boundary current of East Asia by analyzing nine-year carbonate data sampled during 2010-2018 along Kuroshio Current near East China Sea (ECS) by the Japan Meteorological Agency. Professor Tseng\u2019s lab group found trends of surface seawater p<\/em>CO2 <\/sub>at 3.70\u00b10.57 \u00b5<\/span>atm year-1<\/sup> and pH at -0.0033\u00b10.0009 unit year-1<\/sup>, <\/sub>which were significantly greater than the expected rates from CO2 <\/sub>air-sea equilibrium and those reported from other oceanic time-series studies. We assessed potential drivers, processes, fluxes, and implications of CO2<\/sub> cycling in the Kuroshio under climate change. A much faster effect of temperature increase on the rapid rates of p<\/em>CO2 <\/sub>increase and acidification under a sustained supply of dissolved inorganic carbon (DIC) was first identified and then CO2 <\/sub>flux declined significantly by ~50% (~-0.8 to -0.4 mole C m-2<\/sup> y-1<\/sup>) over the Kuroshio study region estimated. If this trend continued and the atmospheric CO2 <\/sub>continued to increase at its current rate, the faster-warming Kuroshio regions could potentially become a CO2<\/sub> source from a sink status and eventual loss of oceanic CO2<\/sub> uptake under climate change near future ca. 2030-2040.<\/p>\n

 <\/p>\n

In summary, this study explored the effects of seawater warming and sustained DIC supply on the CO2 uptake and acidification along the Kuroshio Current in the ECS. Other \u201cwarming hotspots\u201d of the global ocean located along western boundary currents with a continuous DIC supply should exhibit similarly accelerated acidification and p<\/em>CO2<\/sub> rise, which could lead to a significant reduction in ocean CO2<\/sub> uptake. It is eventually of great significance to prevent marine pollution by reducing carbon release to maintain the health of the earth.<\/p>\n

 <\/p>\n

Web link\uff1ahttps:\/\/www.sciencedirect.com\/science\/article\/pii\/S0025326X22011535<\/a>
\n\"\"<\/a><\/p>\n

Conceptual illustration of effects of ocean warming and possible DIC sources on CO2<\/sub> increase and acidification in the Kuroshio seawater of the East China Sea<\/p>\n

\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Shou-En Tsao, Chun-Mao Tseng* \u00a0 Since the industrial revolution, the level of atmospheric carbon dioxide (CO2) has increased by ~50% due to human activities in the past centuries which accelerated global change and a warming threat to the earth. Meanwhile, the ocean has absorbed around 30% of the emitted anthropogenic carbon through the air-sea exchange […]<\/p>\n","protected":false},"author":11,"featured_media":17113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[119],"tags":[142],"class_list":["post-28473","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-highlights","tag-research-highlights-en"],"acf":[],"yoast_head":"\nRapid increase of pCO2 and seawater acidification along Kuroshio of the East China Sea - Institute of Oceanography, NTU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/28473\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rapid increase of pCO2 and seawater acidification along Kuroshio of the East China Sea - Institute of Oceanography, NTU\" \/>\n<meta property=\"og:description\" content=\"Shou-En Tsao, Chun-Mao Tseng* \u00a0 Since the industrial revolution, the level of atmospheric carbon dioxide (CO2) has increased by ~50% due to human activities in the past centuries which accelerated global change and a warming threat to the earth. 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