A secondary ionization mass spectrometry calibration of Cibicidoides pachyderma Mg/Ca with temperature
MetadataShow full item record
An evaluation of C. pachyderma Mg/Ca using a new suite of warm water multicores from the Florida Straits shows that the slope of Mg/Ca with temperature is shallower than previously thought. Using secondary ionization mass spectrometry, we have documented that the distribution of magnesium within the polished walls of foraminiferal tests is Gaussian, suggesting that the Mg/Ca in these samples is not affected by the addition of a secondary high-magnesium calcite in the walls. The Mg/Ca within a typical C. pachyderma test varies by about ±20% (1σ/μ · 100), and the variability increases slightly in tests with higher Mg/Ca. The regression of C. pachyderma Mg/Ca with temperature has a slope of 0.13 ± 0.05 mmol mol−1 per °C, indistinguishable from the slope observed in inductively coupled plasma–mass spectrometry measurements from a different subset of the same multicores, but about one half the slope of previously published calibrations. The largest differences between the calibrations comes at the warm water end of the regression, where previously published C. pachyderma Mg/Ca values from Little Bahama Bank are at least 3 mmol mol−1 higher than observed in these new cores. The reasons for this difference are not fully known but are most likely related to diagenesis at Little Bahama Bank.
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 9 (2008): Q04009, doi:10.1029/2007GC001620.
Suggested CitationArticle: Curry, William B., Marchitto, Thomas M., "A secondary ionization mass spectrometry calibration of Cibicidoides pachyderma Mg/Ca with temperature", Geochemistry Geophysics Geosystems 9 (2008): Q04009, DOI:10.1029/2007GC001620, https://hdl.handle.net/1912/3258
Showing items related by title, author, creator and subject.
Evaluation and recommendations for improving the accuracy of an inexpensive water temperature logger Lentz, Steven J.; Churchill, James H.; Marquette, Craig D.; Smith, Jason C. (American Meteorological Society, 2013-07)Onset's HOBO U22 Water Temp Pros are small, reliable, relatively inexpensive, self-contained temperature loggers that are widely used in studies of oceans, lakes, and streams. An in-house temperature bath calibration of ...
Studies of the waters on the continental shelf, Cape Cod to Chesapeake Bay. I. The cycle of temperature Bigelow, Henry Bryant (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1933-12)When the U. S. Bureau of Fisheries, in cooperation with the Museum of Comparative Zoology, commenced the oceanographic survey of the Gulf of Maine in the summer of 1912 (Bigelow, 1925-1927), it was in the hope that this ...
Lund, David C.; Curry, William B. (American Geophysical Union, 2006-05-05)The salinity and temperature of the Florida Current are key parameters affecting the transport of heat into the North Atlantic, yet little is known about their variability on centennial time scales. Here we report replicated, ...