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Abstract As one of the most widespread components in marine sediments, calcium carbonate (CaCO 3 ) plays a crucial role in the global carbon cycle and climate changes. To efficiently semi‐quantify the CaCO 3 concentration, a more effective, non‐destructive, economic, and accurate technique is required. Diffuse reflectance spectroscopy (DRS) has been widely used for the detection and quantification of minerals but has been less studied for CaCO 3 . This study synthesized a series of samples with well‐determined content of CaCO 3 to analyze the visible and near‐infrared DRS characteristics. Results show that the intensity of the second derivative of Kubelka‐Munk (K‐M) remission functions of the DRS spectra at 2,340 nm ( I 2340 ) is linearly correlated with the CaCO 3 content. Then, the new proxy I 2340 was applied for marine sediments from the Pacific Ocean with known CaCO 3 concentrations determined previously by chemical methods, and the robustness of the I 2340 as the proxy for CaCO 3 concentration was attested.
Cao et al. (Sat,) studied this question.