noaa-ocean-15326 Panama Basin Thorium and Uranium Sediment Data for the Last 25,000 Years Singh, A.; Marcantonio, F.; Lyle, M. Panama Basin Thorium and Uranium Sediment Data for the Last 25,000 Years 2013-10-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/15326 Investigator A. Singh Investigator F. Marcantonio Investigator M. Lyle earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography 230Th excess,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography 238U,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography 232Th,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean radiogenic isotope geoscientificInformation 25340 cal yr BP 857 cal yr BP Complete -1.42 7.85583 -92.4 -82.07 -2830 -712 Ocean Pacific Ocean South Pacific Ocean V19-27>LATITUDE -.47>LONGITUDE -82.07 Ocean Pacific Ocean Eastern Pacific Ocean TR163-11>LATITUDE 6.4>LONGITUDE -85.8 Ocean Pacific Ocean North Pacific Ocean TR163-22>LATITUDE .52>LONGITUDE -92.4 Ocean Pacific Ocean Eastern Pacific Ocean RC8-102>LATITUDE -1.42>LONGITUDE -86.85 Ocean Pacific Ocean Eastern Pacific Ocean ME0005A-43JC>LATITUDE 7.85583>LONGITUDE -83.60833 Ocean Pacific Ocean North Pacific Ocean V21-29>LATITUDE .95>LONGITUDE -89.35 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

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Boulder CO 80305-3328 USA online ASCII Singh, A., F. Marcantonio and M. Lyle 2011 Earth and Planetary Science Letters 309 33-44

Age-model derived sediment mass accumulation rates (MARs) are consistently higher than 230Th-normalized MARs in the Equatorial Pacific Ocean during the past 25 ka. The offset, being highest in the Panama Basin, suggests a significant role for deep-sea sediment redistribution (i.e., sediment focusing) in this region. Here, we test the hypothesis that downslope transport of sediments from topographically high regions that surround the Panama Basin is the cause of higher-than-expected xs230Th inventories over the past 25 ka in the deeper parts of the basin. We find little difference in xs230Th inventories between the highest and lowest reaches of the basin. Furthermore, there is no correlation between xs230Th-derived sediment focusing factors and water depth which suggests that the topographic highs do not serve as a source of xs230Th. A spatial analysis suggests that there may be an enhanced scavenging effect on xs230Th concentrations in sediment closest to the equator whe! re productivity is the highest, although further data is necessary to corroborate this. At the equator xs230Th-derived focusing factors are high and range from about 1 to 5 during the Holocene and about 1 to 11 during the last glacial. In contrast, non-equatorial cores show a smaller range in variability from about 0.7 to 2.8 during the Holocene and from 0.7 to 3.6 during the last glacial. Based on 232Th flux measurements, we hypothesize that the location at which eolian detrital fluxes surpass the riverine detrital fluxes is approximately 300 km from the margin. While riverine fluxes from coastal margins were higher during the Holocene, eolian fluxes were higher during the last glacial. STUDY NOTES: Standard uranium series analysis by inductively-coupled plasma mass spectrometry was used.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-tr163-11.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-v21-29.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-tr163-22.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-rc8-102.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-me0005A-43JC.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/singh2011/singh2011-v19-27.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11