Northwest Pacific Productivity Data During the Last Deglaciation Lam, P.J.; Robinson, L.F.; Blusztajn, J.; Li, C.; Cook, M.S.; McManus, J.F.; Keigwin, L.D. Lam, P.J. Robinson, L.F. Blusztajn, J. Li, C. Cook, M.S. McManus, J.F. Keigwin, L.D. earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,archive half of GGC37) earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (232Th,sediment,null,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (230Th,sediment,two standard deviations,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,opal accumulation) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (volcanic material,sediment,null,count per gram,null,paleoceanography,null,null,N,volcanic ash) earth science/paleoclimate/paleoceanography (238U,sediment,null,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (uranium,sediment,two standard deviations,parts per million,null,paleoceanography,null,null,N,authigenic) earth science/paleoclimate/paleoceanography (232Th,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,detrital sediment) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,calcium carbonate accumulation) earth science/paleoclimate/paleoceanography (neodymium,sediment,null,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (volcanic material,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,volcanic material accumulation) earth science/paleoclimate/paleoceanography (dust,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,working half of GGC37) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,opal accumulation) earth science/paleoclimate/paleoceanography (carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (ice rafted debris,null,null,count per gram,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 (231Pa/230Th excess,sediment,null,dimensionless,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,null) earth science/paleoclimate/paleoceanography (232Th,sediment,null,microgram per square centimeter per kiloyear,null,paleoceanography,null,null,N,232Th flux) earth science/paleoclimate/paleoceanography (mineral matter,sediment,null,percent,null,paleoceanography,null,null,N,residual mineral matter) earth science/paleoclimate/paleoceanography (mineral matter,null,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,residual mineral matter accumulation) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (230Th,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (230Th excess,sediment,two standard deviations,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (dust,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron,sediment,two standard deviations,microgram per square centimeter per kiloyear,null,paleoceanography,null,null,N,soluble iron accumulation) earth science/paleoclimate/paleoceanography (231Pa,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (231Pa,sediment,two standard deviations,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (231Pa/230Th excess,sediment,two standard deviations,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (232Th,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,232Th detrital accumulation) earth science/paleoclimate/paleoceanography (identified foraminifer,sediment,null,count per gram,null,paleoceanography,null,null,N,Uvigerina auberiana) earth science/paleoclimate/paleoceanography (mineral matter,null,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,residual mineral matter accumulation) earth science/paleoclimate/paleoceanography (iron,sediment,null,microgram per square centimeter per kiloyear,null,paleoceanography,null,null,N,soluble iron accumulation) earth science/paleoclimate/paleoceanography (87Sr/86Sr,sediment,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (epsilon neodymium,volcanic material,null,epsilon unit,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (87Sr/86Sr,volcanic material,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (volcanic material,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,volcanic material accumulation) earth science/paleoclimate/paleoceanography (uranium,sediment,null,parts per million,null,paleoceanography,null,null,N,authigenic) earth science/paleoclimate/paleoceanography (232Th,sediment,two standard deviations,parts per million,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,two standard deviations,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (231Pa excess,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (231Pa excess,sediment,two standard deviations,disintegration per minute per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,calcium carbonate accumulation) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (V19-4 GGC37>LATITUDE 50.42>LONGITUDE 167.731667) (RAMA 44PC>LATITUDE 53>LONGITUDE 164.65) During the Bølling–Allerød warm period of the last deglaciation, about 14 kyr ago, there was a strong and pervasive spike in primary productivity in the North Pacific Ocean1. It has been suggested that this productivity event was caused by an influx of the micronutrient iron from surrounding continental shelves as they were flooded by sea-level rise2. Here we test this hypothesis by comparing numerous proxies of productivity with iron flux and provenance measured from a core from the subarctic Pacific Ocean. We find no evidence for an abrupt deglacial pulse of iron from any source at the time of peak productivity. Instead, we argue that the deglacial productivity peak was caused by two stepwise events. First, deep convection during early deglaciation increased nutrient supply to the surface but also increased the depth of the mixed layer, which pushed surface production deeper in the water column and induced light limitation. A subsequent input of meltwater from northern American ice sheets then stratified the water column, which relieved light limitation while leaving the surface waters enriched in nutrients. We conclude that iron plays, at most, a secondary role in controlling productivity during the glacial and deglacial periods in the subarctic Pacific Ocean. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lam, P.J. Investigator : Robinson, L.F. Investigator : Blusztajn, J. Investigator : Li, C. Investigator : Cook, M.S. Investigator : McManus, J.F. Investigator : Keigwin, L.D. 2013-08-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14791 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-foram.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-sed.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-44pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-foram.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-sed.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-44pc.txt English https://www.ncdc.noaa.gov/paleo/study/14791 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-foram.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-sed.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-44pc.txt Lam, P.J., L.F. Robinson, J. Blusztajn, C. Li, M.S. Cook, J.F. McManus and L.D. Keigwin. 2013. Transient stratification as the cause of the North Pacific productivity spike during deglaciation. Nature Geoscience, 6, 622-626. DOI: 10.1038/ngeo1873 START YEAR: 23502 cal yr BP * END YEAR: 2849 cal yr BP 164.65 50.42 167.731667 53