ESTIMATED PRECISION OF pCO<sub>2</sub> BASED ON CARBONATE CHEMISTRY IN BRACKISH WATERS

DOI Web Site 1 Citations 9 References
  • NAKAMURA Wataru
    東京大学大学院 新領域創成科学研究科社会文化環境学専攻
  • ENDO Masanori
    東京大学 新領域創成科学研究科社会文化環境学専攻
  • SASAKI Jun
    東京大学 新領域創成科学研究科社会文化環境学専攻
  • ENDO Toru
    大阪公立大学大学院 工学研究科都市系専攻
  • ZHAO Yue
    東京大学大学院 新領域創成科学研究科社会文化環境学専攻
  • UEMURA Kenta
    大阪市立大学大学院 工学研究科都市系専攻
  • OGURA Kazuki
    大阪公立大学大学院 工学研究科都市系専攻

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Other Title
  • 炭酸化学理論に基づく汽水域における水中CO<sub>2</sub>分圧の推定精度

Abstract

<p> pCO2 is a dominant factor for controlling CO2 exchange between air and water. Based oncarbonate chemistry, we estimated the precision of pCO2 in waters of Tokyo Bay, Osaka Bay, and the Fukido estuary, Ishigaki, Okinawa.</p><p> We evaluated the precisions of reported formulas for dissociation contents of carbonic acid required for calculating pCO2. Millero (2010) achieved the highest precision in Tokyo Bay, while Schockman et al. (2021) did in Osaka Bay and the Fukido estuary. The precision of estimated pCO2 based on portable pH and salinity sensors exceeded 190 μatm; it was significantly larger when pCO2 was above 800 μatm. Below a pCO2 value of 800 μatm, the precision based on total alkalinity estimated by salinity was less than 34μatm (13.13%). By contrast, the precision based on portable pH sensors (precision of 0.1 or greater) was greater and varied between 73 – 171 μatm (13.16 – 64.88%). The pCO2 calculated from the pH and salinity is subject to errors in both observations. Therefore, the validity of the values should be studied by considering that atmospheric pCO2 is around 400 μatm.</p>

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