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Ocean acidification off the south coast of Japan : A result from time series observations of CO2 parameters from 1994 to 2008

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Title: Ocean acidification off the south coast of Japan : A result from time series observations of CO2 parameters from 1994 to 2008
Authors: Ishii, Masao Browse this author
Kosugi, Naohiro Browse this author
Sasano, Daisuke Browse this author
Saito, Shu Browse this author
Midorikawa, Takashi Browse this author
Inoue, Hisayuki Y. Browse this author →KAKEN DB
Issue Date: 28-Jun-2011
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Oceans
Volume: 116
Start Page: C06022
Publisher DOI: 10.1029/2010JC006831
Abstract: Ocean acidification resulting from increases in present and future atmospheric CO2 levels could seriously affect diverse coastal and oceanic ecosystems. In this work, we determine that a significant trend in ocean acidification is superposed on the large seasonal and interannual variabilities of acidity in surface waters off the south coast of Honshu, Japan, based on our repeated observations of partial pressure of CO2 (pCO2), total inorganic carbon (TCO2), and pH. Multiple regression analysis of TCO2 as a function of temperature, salinity, and timing of observations shows that TCO2 increased at a rate of + 1.23 ± 0.40 μmol kg^[-1] yr^[-1] for the period 1994-2008, while no long-term change has been determined for total alkalinity calculated from TCO2 and pCO2 in seawater. These results indicate that pH and the aragonite saturation state (Ωarag) are decreasing at a rate of -0.020 ± 0.007 decade^[-1] and -0.12 ± 0.05 decade^[-1], respectively. If future atmospheric CO2 levels keep increasing as predicted by the Intergovernmental Panel on Climate Change emission scenario A1FI, which postulates intensive fossil fuel use associated with very rapid economic growth, a further reduction of -0.8 to -1.0 in Ωarag is likely in the next 50 years. Such a rapid reduction of Ωarag could have negative impacts on a variety of calcareous organisms.
Rights: Copyright 2011 by the American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/47870
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 吉川 久幸

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