Articles | Volume 15, issue 15
https://doi.org/10.5194/bg-15-4759-2018
https://doi.org/10.5194/bg-15-4759-2018
Technical note
 | 
09 Aug 2018
Technical note |  | 09 Aug 2018

Technical note: A refinement of coccolith separation methods: measuring the sinking characteristics of coccoliths

Hongrui Zhang, Heather Stoll, Clara Bolton, Xiaobo Jin, and Chuanlian Liu

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Cited articles

Bach, L. T., Riebesell, U., Sett, S., Febiri, S., Rzepka, P., and Schulz, K. G.: An approach for particle sinking velocity measurements in the 3–400 µm size range and considerations on the effect of temperature on sinking rates, Mar. Biol., 159, 1853–1864, https://doi.org/10.1007/s00227-012-1945-2, 2012. 
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Baumann, K.-H.: Importance of size measurements for coccolith carbonate flux estimates, Micropaleontology, 50, 35–43, 2004. 
Beaufort, L., Lancelot, Y., Camberlin, P., Cayre, O., Vincent, E., Bassinot, F., and Labeyrie, L.: Insolation cycles as a major control of equatorial Indian Ocean primary production, Science, 278, 1451–1454, https://doi.org/10.1126/science.278.5342.1451, 1997. 
Beltran, C., de Rafélis, M., Minoletti, F., Renard, M., Sicre, M. A., and Ezat, U.: Coccolith δ18O and alkenone records in middle Pliocene orbitally controlled deposits: High-frequency temperature and salinity variations of sea surface water, Geochem. Geophy. Geosy., 8, Q05003, https://doi.org/10.1029/2006GC001483, 2007. 
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The sinking speeds of coccoliths are relevant for laboratory methods to separate coccoliths for geochemical analysis. However, in the absence of estimates of coccolith settling velocity, previous implementations have depended mainly on time-consuming method development by trial and error. In this study, the sinking velocities of cocooliths were carefully measured for the first time. We also provide an estimation of coccolith sinking velocity by shape, which will make coccolith separation easier.
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