Using the natural spatial pattern of marine productivity in the Subarctic North Pacific to evaluate paleoproductivity proxies

摘要: Sedimentary proxies used to reconstruct marine productivity suffer from variable preservation and are sensitive factors other than productivity. Therefore, proxy calibration is warranted. Here we map the spatial patterns of two paleoproductivity proxies, biogenic opal barium fluxes, a set core-top sediments recovered in Subarctic North Pacific. Comparisons data with independent estimates primary export production, surface water macronutrient concentrations, biological pCO2 drawdown indicate that neither shows significant correlation or for entire region. Biogenic when corrected using 230Th-normalized accumulation rates, show good along volcanic arcs (τ = 0.71, p = 0.0024) throughout western Pacific p = 0.0107). Moderate correlations flux production (τ = 0.57, p = 0.0022) silicate concentrations (τ = 0.70, p = 0.0002) observed central eastern For reasons unknown, however, no found between reference data. Nonetheless, barite saturation, uncertainty lithogenic corrections, problems sets not responsible lack Further studies evaluating controlling variability constituents desirable this