noaa-ocean-21009 Juan de Fuca Ridge Mass Flux Data over the Last 500 ka Costa, K.; McManus, J.F. Juan de Fuca Ridge Mass Flux Data over the Last 500 ka 2016-12-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21009 Investigator K. Costa Investigator J.F. McManus earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography accumulation rate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass flux earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography accumulation rate,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass flux earth science paleoclimate paleocean lithology earth science paleoclimate paleocean radiogenic isotope geoscientificInformation 16769 cal yr BP 309737 cal yr BP Complete 44.88717 45.04507 -130.8785 -130.45737 -2794 -2655 Ocean Pacific Ocean North Pacific Ocean AT26-19 05PC>LATITUDE 44.97283>LONGITUDE -130.8785 Ocean Pacific Ocean North Pacific Ocean AT26-19 38PC>LATITUDE 44.97053>LONGITUDE -130.60653 Ocean Pacific Ocean North Pacific Ocean AT26-19 12PC>LATITUDE 44.8975>LONGITUDE -130.50433 Ocean Pacific Ocean North Pacific Ocean AT26-19 35PC>LATITUDE 44.99118>LONGITUDE -130.45737 Ocean Pacific Ocean North Pacific Ocean AT26-19 39BB>LATITUDE 45.04507>LONGITUDE -130.83318 Ocean Pacific Ocean North Pacific Ocean AT26-19 09PC>LATITUDE 44.88717>LONGITUDE -130.63683 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 Costa, K.M. and J.F. McManus 2017 Geochimica et Cosmochimica Acta 197 215-225 10.1016/j.gca.2016.10.034

230Th normalization is an indispensable method for reconstructing sedimentation rates and mass fluxes over time, but the validity of this approach has generated considerable debate in the paleoceanographic community. 230Th systematics have been challenged with regards to grain size bias, sediment composition (CaCO3), water column advection, and other processes. In this study, we investigate the consequences of these effects on 230Th normalization from a suite of six cores on the Juan de Fuca Ridge. The proximity of these cores (<30 km) suggests that they should receive the same particle rain rate of sediment, but the steep bathymetry of the ridge leads to substantial sediment redistribution and variable carbonate preservation, both of which may limit the usage of 230Th in this region. Despite anticipated complications, 230Th normalization effectively recon- structs nearly identical particle rain rates from all six cores, which are summarily unrelated to the total sedimentation rates as calculated from the age models. Instead the total sedimentation rates are controlled almost entirely by sediment focusing and winnowing, which are highly variable even over the short spatial scales investigated in this study. Furthermore, no feed- backs on 230Th systematics were detected as a consequence of sediment focusing, coarse fraction variability, or calcium car- bonate content, supporting the robustness of the 230Th normalization technique. STUDY NOTES: 11-Oct-17: Data table for 12PC updated to correct ordering of depths.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-05pc.txt Formatted Text File; AT26-19 05PC Mass Flux Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-38pc.txt Formatted Text File; AT26-19 38PC Mass Flux Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-39bb.txt Formatted Text File; AT26-19 39BB Mass Flux Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-12pc.txt Formatted Text File; AT26-19 12PC Mass Flux Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-09pc.txt Formatted Text File; AT26-19 09PC Mass Flux Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017/costa2017-35pc.txt Formatted Text File; AT26-19 35PC Mass Flux Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11