Citation:

bg-14-5693-2017

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Abstract:

Over the last decade, hydrogen isotopes of long-chain alkenones have been shown to be a promising proxy for reconstructing paleo sea surface salinity due to a strong hydrogen isotope fractionation response to salinity across different environmental conditions. However, to date, the decoupling of the effects of alkalinity and salinity, parameters that co-vary in the surface ocean, on hydrogen isotope fractionation of alkenones has not been assessed. Furthermore, as the alkenone-producing haptophyte, Emiliania huxleyi, is known to grow in large blooms under high light intensities, the effect of salinity on hydrogen isotope fractionation under these high irradiances is important to constrain before using dDC37 to reconstruct paleosalinity. Batch cultures of the marine haptophyte E. huxleyi strain CCMP 1516 were grown to investigate the hydrogen isotope fractionation response to salinity at high light intensity and independently assess the effects of salinity and alkalinity under low light conditions. Our results suggest that alkalinity does not significantly influence hydrogen isotope fractionation of alkenones, but salinity does have a strong effect. Additionally, no significant difference was observed between the fractionation responses to salinity recorded in alkenones grown under both high and low light conditions. Comparison with previous studies suggests that the fractionation response to salinity in culture is similar under different environmental conditions, strengthening the use of hydrogen isotope fractionation as a paleosalinity proxy.

Project(s):

NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University (NIOZ_UU)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Species	Species		Weiss, Gabriella M
2	Strain	Strain		Weiss, Gabriella M
3	Salinity	Sal		Weiss, Gabriella M	PSU
4	Temperature, water	Temp	°C	Weiss, Gabriella M
5	Radiation, photosynthetically active	PAR	µmol/m²/s	Weiss, Gabriella M
6	Growth rate	µ	#/day	Weiss, Gabriella M
7	δ Deuterium, water	δD H2O	‰ SMOW	Weiss, Gabriella M	culture water, initial
8	δ Deuterium, standard deviation	δD std dev	±	Weiss, Gabriella M	culture water, initial
9	δ Deuterium, water	δD H2O	‰ SMOW	Weiss, Gabriella M	culture water, end
10	δ Deuterium, standard deviation	δD std dev	±	Weiss, Gabriella M	culture water, end
11	δ Deuterium, alkenone, C37	δD C37	‰ SMOW	Weiss, Gabriella M
12	δ Deuterium, alkenone, C37, standard deviation	δD C37 std dev	±	Weiss, Gabriella M
13	Fractionation factor	Frac Factor		Weiss, Gabriella M	alpha C37, between water and C37 alkenones
14	Fractionation factor, error	Frac Factor e	±	Weiss, Gabriella M
15	Alkalinity, total	AT	mmol(eq)/l	Weiss, Gabriella M	culture water, initial
16	Alkalinity, total	AT	mmol(eq)/l	Weiss, Gabriella M	culture water, end
17	pH	pH		Weiss, Gabriella M	culture water, initial
18	pH	pH		Weiss, Gabriella M	culture water, end

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

628 data points

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