noaa-ocean-16135 Mytilus californianus Skeletal Chemistry Data From Cabrillo National Monument, San Diego, CA Ford, H.L.; Schellenberg, S.A.; Becker, B.J.; Deutschman, D.L.; Dyck, K.A.; Koch, P.L. Mytilus californianus Skeletal Chemistry Data From Cabrillo National Monument, San Diego, CA 2014-03-04 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16135 Investigator H.L. Ford Investigator S.A. Schellenberg Investigator B.J. Becker Investigator D.L. Deutschman Investigator K.A. Dyck Investigator P.L. Koch earth science paleoclimate paleoceanography strontium/calcium,bivalve,null,millimole per mole,null,paleoceanography,null,null,N,Mytilus californianus earth science paleoclimate instrumental delta 18O,sea water,null,per mil VSMOW,null,instrumental,null,null,N,null earth science paleoclimate instrumental sea water temperature,null,null,degree Celsius,null,instrumental,averaged,null,N,null earth science paleoclimate paleoceanography delta 13C,bivalve,null,per mil VPDB,null,paleoceanography,null,null,N,Mytilus californianus earth science paleoclimate instrumental delta 18O,sea water,null,per mil VSMOW,null,instrumental,averaged,null,N,null earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,bivalve,null,per mil VPDB,null,paleoceanography,null,null,N,Mytilus californianus earth science paleoclimate instrumental salinity,sea water,null,practical salinity unit,null,instrumental,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Boundary dates earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Sample Date earth science paleoclimate paleoceanography growth rate,bivalve,null,millimeter,null,paleoceanography,null,null,N,Mytilus californianus outplant accretion earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Sample Mid-date earth science paleoclimate paleoceanography magnesium/calcium,bivalve,null,millimole per mole,null,paleoceanography,null,null,N,Mytilus californianus earth science paleoclimate paleoceanography growth rate,bivalve,null,millimeter,null,paleoceanography,null,null,N,Mytilus californianus earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean physical properties geoscientificInformation 2004 AD 2005 AD -54 cal yr BP -55 cal yr BP Complete 32.664333 32.664333 -117.2425 -117.2425 Ocean Pacific Ocean Eastern Pacific Ocean Cabrillo National Monument>LATITUDE 32.664333>LONGITUDE -117.2425 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Ford, H.L., Schellenberg, S.A., Becker, B.J., Deutschman, D.L., Dyck, K.A., and Koch, P.L. 2010 Paleoceanography 25 10.1029/2008PA001677

Molluscan shell chemistry may provide an important archive of mean annual temperature (MAT) and mean annual range in temperature (MART), but such direct temperature interpretations may be confounded by biologic, metabolic, or kinetic factors. To explore this potential archive, we outplanted variously sized specimens of the common mussel Mytilus californianus at relatively low and high intertidal positions in San Diego, California, for 382 days with in situ recording of ambient temperature and periodic sampling of water chemistry. The prismatic calcite layer of eight variously sized specimens from each intertidal position were then serially microsampled and geochemically analyzed. Average intraspecimen δ18O values significantly covaried only with temperature, whereas Mg/Ca values showed a strong and significant positive correlation with growth rate. To assess intra-annual variations in shell chemistry as proxy for MART, each specimen's δ18O record was ordinated in the time domain and compared to the predicted isotopic equilibrium δ18O values from environmental data. Observed specimen values were significantly correlated with predicted equilibrium values, but show 18O enrichments of 0.2 to 0.5‰. In contrast, Mg/Ca values were poorly correlated with temperature due to significant positive relationships with growth rate and intertidal position. Within the extrapallial fluid, pH, carbonate solution chemistry, Rayleigh fractionation and/or an undetermined source of disequilibrium may cause δ18O values to deviate from predicted equilibrium precipitation for ambient seawater. Despite this consistent 18O enrichment, intraskeletal variations in δ18O values readily characterize the instrumental MAT and 5–95% MART values, making M. californianus a valuable source of information for paleoceanographic reconstructions. STUDY NOTES: Molluscan shell chemistry may provide an important archive of mean annual temperature (MAT) and mean annual range in temperature (MART), but such direct temperature interpretations may be confounded by biologic, metabolic, or kinetic factors. To explore this potential archive, we outplanted variously sized specimens of the common mussel Mytilus californianus at relatively low and high intertidal positions in San Diego, California, for 382 days with in situ recording of ambient temperature and periodic sampling of water chemistry. The prismatic calcite layer of eight variously sized specimens from each intertidal position were then serially microsampled and geochemically analyzed. Average intraspecimen d18O values significantly covaried only with temperature, whereas Mg/Ca values showed a strong and significant positive correlation with growth rate. To assess intra-annual variations in shell chemistry as proxy for MART, each specimen’s d18O record was ordinated in the t! ime domain and compared to the predicted isotopic equilibrium d18O values from environmental data. Observed specimen values were significantly correlated with predicted equilibrium values, but show 18O enrichments of 0.2 to 0.5%. In contrast, Mg/Ca values were poorly correlated with temperature due to significant positive relationships with growth rate and intertidal position. Within the extrapallial fluid, pH, carbonate solution chemistry, Rayleigh fractionation and/or an undetermined source of disequilibrium may cause d18O values to deviate from predicted equilibrium precipitation for ambient seawater. Despite this consistent 18O enrichment, intraskeletal variations in d18O values readily characterize the instrumental MAT and 5–95% MART values, making M. californianus a valuable source of information for paleoceanographic reconstructions. Keywords: mollusc, mytilus

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