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- W2989564810 abstract "Abstract The removal of exchangeable oxygen from diatom opal prior to δ 18 O diatom analysis is a crucial first step before analyzing frustule oxygen isotopes for paleoceanographic applications. We present the results of experiments that quantify the temperature‐dependent reactivity of biogenic silica with water under laboratory conditions. We demonstrate that controlled exchange between rinse water and diatom opal at room temperature results in predictable alteration of δ 18 O diatom , after vacuum dehydroxylation. Diatom samples equilibrated with an 18 O‐enriched δ 18 O equil. water solution of +94.4‰ at ~21 °C for 70 hr prior to dehydroxylation yield δ 18 O diatom data that can be directly interpreted with existing empirical δ 18 O diatom versus temperature relationships. We compare sediment trap‐based δ 18 O diatom temperature data with modern δ 18 O foram temperatures. Finally, we present an ~220 year record of δ 18 O diatom data from an eastern Pacific Guaymas Basin boxcore, analyzed using the microfluorination technique, that indicates diatom chlorophyll maximum (Chl max ) temperatures have shifted from a period during the late eighteenth and nineteenth centuries that was 8 °C cooler during the fall bloom relative to mean annual alkenone sea surface temperature, to the late twentieth century when we observe no difference between alkenone sea surface temperature and diatom Chl max . These data suggest a twentieth century seasonal shift in the timing of fall upwelling and Guaymas Basin stratification breakdown that could be due to reduced upwelling efficiency and/or increased summer mixed layer thermal stratification." @default.
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- W2989564810 date "2020-01-31" @default.
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- W2989564810 title "220 Year Diatom δ<sup>18</sup>O Reconstruction of the Guaymas Basin Thermocline Using Microfluorination" @default.
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- W2989564810 doi "https://doi.org/10.1029/2019pa003749" @default.
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