# Central Equatorial Pacific Dust Flux Reconstruction 110-150 ka #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/19723 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/jacobel2016/jacobel2016-37bb.txt # # Archive: Paleoceanography # # Parameter_Keywords: radiogenic isotopes, geochemistry, reconstruction #--------------------------------------- # Contribution_Date # Date: 2016-01-25 #--------------------------------------- # Title # Study_Name: Central Equatorial Pacific Dust Flux Reconstruction 110-150 ka #--------------------------------------- # Investigators # Investigators: Jacobel, A.W.; McManus, J.F.; Anderson, B.A.; Winckler, G. #--------------------------------------- # Description and Notes # Description: 230Thxs,0-normalized 232Th fluxes converted to dust fluxes; Note: Age-depth relationships for cores ML1208-37BB, 31BB and 17PC were developed on the basis of planktonic oxygen isotope stratigraphies (dataset: noaa-ocean-1001374), which were tied to the LR04 benthic stack with the assistance of a modified Monte-Carlo-enabled cross-correlation maximization scheme and random walk algorithm (MonteXCM). # Provided Keywords: Younger Dryas, glacial, thorium, dust #--------------------------------------- # Publication # Authors: Jacobel, A.W., J.F. McManus, R.F. Anderson, and G. Winckler # Published_Date_or_Year: 2016 # Published_Title: Large Deglacial Shifts of the Pacific Intertropical Convergence Zone # Journal_Name: Nature Communications # Volume: 7 # Issue: # Pages: # Report Number: # DOI: 10.1038/ncomms10449 # Full_Citation: # Abstract: The position of the Intertropical Convergence Zone (ITCZ) is sensitive to changes in the balance of heat between the hemispheres, which has fundamental implications for tropical hydrology and atmospheric circulation. Although the ITCZ is thought to experience the largest shifts in position during deglacial stadial events, the magnitude of shifts has proven difficult to reconstruct, in part because of a paucity of high-resolution records, particularly those including spatial components. Here, we track the position of the ITCZ from 150-110 ka at three sites in the central equatorial Pacific at sub-millennial time resolution. Our results provide the first evidence of large, abrupt changes in tropical climate during the penultimate deglaciation, coincident with North Atlantic Heinrich Stadial 11 (~136-129 ka). We identify this event both as a northern hemisphere increase in aeolian dust and as a shift in the mean position of the ITCZ a minimum of four degrees southwards at 160°W. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: AGS-1502889, NSF OCE-1003374, OCE-1159053, OCE-1158886 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Comer Science and Education Foundation # Grant: #--------------------------------------- # Site Information # Site_Name: ML1208-37 # Location: Central Equatorial Pacific # Country: # Northernmost_Latitude: 7.04 # Southernmost_Latitude: 7.04 # Easternmost_Longitude: -161.63 # Westernmost_Longitude: -161.63 # Elevation: -2798 #--------------------------------------- # Data_Collection # Collection_Name: ML1208-37BB_Dust_Flux Jacobel16 # First_Year: 149900 # Last_Year: 111100 # Time_Unit: cal yrBP # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth_cm depth,,,cm,,,,,N ## age_calkaBP age,,,calendar kyr before present,,,,,N ## dustflux-Th dust flux,230Thxs,0-normalized 232Th fluxes,,g/cm2/kyr,,Paleoceanography,,analytical technique: isotope dilution mass spectrometry (Element XR ICP-MS),N ## dustflux-Th_err.2s dust flux,230Thxs,0-normalized 232Th fluxes,two standard deviations,g/m2/yr,,Paleoceanography,,,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: depth_cm age_calkaBP dustflux-Th dustflux-Th_err.2s 132 111.1 0.164 0.009 134 112.8 0.146 0.006844297 136 114.7 0.145 0.007450856 138 117.0 0.124 0.006033242 140 119.3 0.115 0.00542746 142 122.4 0.105 0.00474215 144 125.1 0.108 0.005562951 146 126.9 0.134 0.007045629 148 128.7 0.153 0.008189201 149 129.5 0.172 0.0080045 150 130.2 0.191 0.011132402 151 130.9 0.242 0.014586295 152 131.5 0.239 0.013322088 154 132.8 0.277 0.016634046 156 134.1 0.273 0.015609289 158 135.5 0.279 0.019439503 160 137.1 0.273 0.018254073 161 137.9 0.282 0.019633021 162 138.7 0.259 0.017765114 164 140.3 0.239 0.01371925 166 141.9 0.260 0.018368385 168 143.5 0.268 0.018625999 170 145.1 0.277 0.021065959 172 146.7 0.253 0.017850977 174 148.3 0.277 0.016606364 176 149.9 0.293 0.023617817