Figure 2
From: Acceleration of modern acidification in the South China Sea driven by anthropogenic CO2
Coral-inferred pHsw in the SCS and atmospheric CO2 (ref. 32).
Comparison of the pHsw (red circles and lines) based on boron isotope and atmospheric CO2 (gray dots and yellow line) from (a) AD 1000–2000 and two enlarged sections during (b) AD 1030–1100 and (c) AD 1830–2000. CO2 data after 1958 (included) are annual averages of direct observations from Mauna Loa and the South Pole32. CO2 data before 1958 are from ice cores33. Vertical red bars denote the 2σ uncertainty of pHsw. Dark blue triangle in (c) indicates position of 230Th-dated layer. The chronology of fossil sample was set by year intervals relative to the dating layer.
