# Iberian Margin IODP U1385 High Resolution Isotope and Trace Metal Data 1235 to 1320 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/19747 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/birner2016/birner2016-isot.txt # # Archive: Paleoceanography # # Parameter_Keywords: carbon isotopes, oxygen isotopes, trace metals in carbonates #--------------------------------------- # Contribution_Date # Date: 2016-02-03 #--------------------------------------- # Title # Study_Name: Iberian Margin IODP U1385 High Resolution Isotope and Trace Metal Data 1235 to 1320 ka #--------------------------------------- # Investigators # Investigators: Birner, Benjamin; Hodell, David A. #--------------------------------------- # Description_Notes_and_Keywords # Description: The study uses sections 1 to 6 in Core 339-U1385D-15H (123.59-135.82 meter below sea floor (mbsf)) and sections 5 and 6 in Core 339-U1385E-16H (135.24-136.97 mbsf). The splice tie point between the cores occurs at 147.32 corrected revised meters composite depth (crmcd) where U1385D-15H-6, 80 cm is tied to U1385E-16H-5, 59 cm, yielding a ~8 m long section (140.26-148.88 crmcd) spanning MIS 37-41. Depth is a corrected revised meter composite depth across all cores. # Instrument precision of repeated standard measurements was 0.06 per mil for d13C and 0.08 per mil for d18O. d18O U. peregrina record uses C. wuellerstorfi and C. mundulus values adjusted by +0.64 per mil. Precision of deep water temperature calculation is 0.87 degrees C. Precision of d18O water is 0.23 per mil SMOW. Error on Mg/Ca U. peregrina analysis: ~4-6%. # Provided Keywords: millennial variability, early Pleistocene, Iberian margin #--------------------------------------- # Publication # Authors: Birner, B., D.A. Hodell, P.C. Tzedakis, and L.C. Skinner # Published_Date_or_Year: 2016 # Published_Title: Similar millennial climate variability on the Iberian margin during two early Pleistocene glacials and MIS 3 # Journal_Name: Paleoceanography # Volume: 31 # Issue: # Pages: # Report Number: # DOI: 10.1002/2015PA002868 # Full_Citation: # Abstract: Although millennial-scale climate variability (<10 ka) has been well studied during the last glacial cycles, little is known about this important aspect of climate in the early Pleistocene, prior to the Middle Pleistocene Transition. Here we present an early Pleistocene climate record at centennial resolution for two representative glacials (marine isotope stages (MIS) 37-41 from approximately 1235 to 1320 ka) during the "41 ka world" at Integrated Ocean Drilling Program Site U1385 (the "Shackleton Site") on the southwest Iberian margin. Millennial-scale climate variability was suppressed during interglacial periods (MIS 37, MIS 39, and MIS 41) and activated during glacial inceptions when benthic d18O exceeded 3.2‰. Millennial variability during glacials MIS 38 and MIS 40 closely resembled Dansgaard-Oeschger events from the last glacial (MIS 3) in amplitude, shape, and pacing. The phasing of oxygen and carbon isotope variability is consistent with an active oceanic thermal bipolar see-saw between the Northern and Southern Hemispheres during most of the prominent stadials. Surface cooling was associated with systematic decreases in benthic carbon isotopes, indicating concomitant changes in the meridional overturning circulation. A comparison to other North Atlantic records of ice rafting during the early Pleistocene suggests that freshwater forcing, as proposed for the late Pleistocene, was involved in triggering or amplifying perturbations of the North Atlantic circulation that elicited a bipolar see-saw response. Our findings support similarities in the operation of the climate system occurring on millennial time scales before and after the Middle Pleistocene Transition despite the increases in global ice volume and duration of the glacial cycles. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Natural Environmental Research Council (NERC) # Grant: NE/K005804/1 #--------------------------------------- # Site Information # Site_Name: IODP U1385 # Location: Iberian margin # Country: Portugal # Northernmost_Latitude: 37.571417 # Southernmost_Latitude: 37.571417 # Easternmost_Longitude: -10.126033 # Westernmost_Longitude: -10.126033 # Elevation: -2578 #--------------------------------------- # Data_Collection # Collection_Name: IODP U1385-339-U1385D-15H-16H Trace Metals and DWT Birner16 # First_Year: 1320000 # Last_Year: 1235000 # Time_Unit: cal yr BP # Core_Length: 140.26-148.88 corrected revised meter composite depth (crmcd) # Notes: #--------------------------------------- # Chronology_Information # Chronology: # This age model is a refinement of the previously published local insolation-tuned age model of Hodell et al. (2015) by tuning the sediment lightness parameter L* to orbital precession instead for the study interval. # Depth (crmcd) Age (ka) # 134.58 1184.25 # 140.54 1241 # 142.03 1260.75 # 144.64 1281 # 146 1298.25 # 148.48 1314.6 # 154.85 1355.7 # #--------------------------------------- # 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) ## sampleID sample ID,,, ,,paleoceanography,,,C ## depth_crmcd Depth,,,corrected revised meter composit ,,,unified depth scale of all four holes,,N ## age-prec age,,,calendar kiloyears before present,,,,age based on tuning sediment lightness L* to orbital precession,N ## Mg/Ca-u.pereg Magnesium/Cacium,Uvigerina peregrina,,mmol/mol,,paleoceanography,,,N ## BWT-Mg/Ca-u.pereg temperature,bottom water,,degrees Celsius,,climate reconstruction,,using Mg/Ca U.peregrina,N ## d18Ou.pereg-eq delta 18O,Uvigerina peregrina and equivalent values,,per mil PDB,,paleoceanography,,add 0.64 per mil to C. wuellerstorfi and C. mundulus values,N ## d18O-w delta 18O,water,,per mil SMOW,,paleoceanography,,,N ## notes notes,,,,,paleoceanography,,,C #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN sampleID depth_crmcd age-prec Mg/Ca-u.pereg BWT-Mg/Ca-u.pereg d18Ou.pereg-eq d18O-w notes U1385D-15H-1, 100-101 140.08 1236.62 1.394 3.9 3.35 0.38 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-1, 125-128 140.32 1238.91 1.29 2.9 3.57 0.34 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-1, 131-132 140.38 1239.48 1.269 2.7 2.97 -0.31 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-1, 136-137 140.43 1239.95 1.338 3.4 3.36 0.25 U1385D-15H-1, 140-141 140.47 1240.33 1.206 2.1 3.42 -0.02 U1385D-15H-1, 145-146 140.51 1240.71 1.456 4.6 3.36 0.54 U1385D-15H-2, 0-1 140.57 1241.4 1.322 3.2 3.18 0.03 U1385D-15H-2, 5-6 140.62 1242.06 1.324 3.2 3.22 0.08 U1385D-15H-2, 5-6 140.62 1242.06 1.271 2.7 3.28 0 U1385D-15H-2, 10-11 140.67 1242.72 1.274 2.7 3.35 0.08 U1385D-15H-2, 15-16 140.72 1243.39 1.339 3.4 3.28 0.17 U1385D-15H-2, 20-21 140.77 1244.05 1.245 2.4 3.26 -0.08 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-2, 25-26 140.82 1244.71 1.305 3 3.52 0.32 U1385D-15H-2, 30-31 140.87 1245.37 1.368 3.7 3.19 0.15 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-2, 34-35 140.91 1245.9 1.404 4 3.81 0.87 U1385D-15H-2, 35-36 140.92 1246.04 1.469 4.7 4.01 1.23 U1385D-15H-2, 39-40 140.96 1246.57 1.204 2 4.3 0.86 U1385D-15H-2, 41-42 140.98 1246.83 1.24 2.4 4.09 0.73 U1385D-15H-2, 45-46 141.02 1247.36 1.131 1.3 4.54 0.91 U1385D-15H-2, 51-52 141.08 1248.16 1.269 2.7 4.29 1 d18O U. pereg value is d18O C. mundulus + 0.64 per mil U1385D-15H-2, 55-56 141.12 1248.69 1.139 1.4 4.74 1.13 U1385D-15H-2, 59-60 141.16 1249.22 1.144 1.4 4.74 1.14 U1385D-15H-2, 61-62 141.18 1249.48 1.169 1.7 4.48 0.95 U1385D-15H-2, 65-66 141.22 1250.01 1.106 1.1 4.62 0.93 U1385D-15H-2, 70-71 141.27 1250.68 1.115 1.1 4.54 0.87 U1385D-15H-2, 76-77 141.33 1251.47 1.196 2 4.95 1.48 U1385D-15H-2, 80-81 141.37 1252 1.197 2 4.56 1.1 U1385D-15H-2, 85-86 141.42 1252.66 0.993 -0.1 4.94 0.97 U1385D-15H-2, 90-91 141.47 1253.33 1.082 0.8 4.71 0.96 U1385D-15H-2, 95-96 141.52 1253.99 1.148 1.5 4.94 1.36 U1385D-15H-2, 95-96 141.52 1253.99 1.101 1 5 1.3 U1385D-15H-2, 95-96 141.52 1253.99 1.081 0.8 4.93 1.18 U1385D-15H-2, 100-101 141.57 1254.65 1.168 1.7 4.76 1.22 U1385D-15H-2, 101-102 141.58 1254.79 1.063 0.6 4.9 1.1 U1385D-15H-2, 101-102 141.58 1254.79 1.064 0.6 4.87 1.08 U1385D-15H-2, 105-106 141.62 1255.32 1.188 1.9 4.86 1.38 U1385D-15H-2, 110-111 141.67 1255.98 1.179 1.8 4.38 0.87 U1385D-15H-2, 115-116 141.72 1256.64 1.067 0.7 4.74 0.95 U1385D-15H-2, 120-121 141.77 1257.3 0.981 -0.2 4.7 0.7 U1385D-15H-2, 125-126 141.82 1257.97 1.057 0.6 4.7 0.89 U1385D-15H-2, 125-126 141.82 1257.97 1.04 0.4 4.76 0.9 U1385D-15H-2, 130-131 141.87 1258.63 1.055 0.5 4.68 0.86 U1385D-15H-2, 135-136 141.92 1259.29 0.983 -0.2 4.52 0.52 U1385D-15H-2, 140-141 141.97 1259.95 1.153 1.5 4.29 0.72 U1385D-15H-2, 145-146 142.02 1260.62 1.063 0.6 4.48 0.69 U1385D-15H-3, 0-1 142.1 1261.29 1.078 0.8 4.22 0.46 U1385D-15H-3, 10-11 142.2 1262.07 1.001 0 4.34 0.39 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 22-23 142.32 1263 0.998 0 4.15 0.19 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 22-23 142.32 1263 1.106 1.1 4.15 0.46 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 30-31 142.4 1263.62 1.158 1.6 4.28 0.73 U1385D-15H-3, 40-41 142.5 1264.4 1.163 1.6 4.18 0.63 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 50-51 142.6 1265.17 1.4 4 4.29 1.34 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 60-61 142.7 1265.95 1.123 1.2 4.07 0.42 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 61-62 142.71 1266.03 1.109 1.1 4.14 0.46 U1385D-15H-3, 70-71 142.8 1266.72 1.092 0.9 4.13 0.4 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-3, 71-72 142.81 1266.8 1.157 1.6 4.26 0.69 U1385D-15H-3, 80-81 142.9 1267.5 1.171 1.7 3.99 0.46 U1385D-15H-3, 80-81 142.9 1267.5 1.11 1.1 4.03 0.35 U1385D-15H-3, 90-91 143 1268.28 1.384 3.8 3.97 0.98 U1385D-15H-3, 100-101 143.1 1269.05 1.298 3 3.69 0.49 U1385D-15H-3, 111-112 143.21 1269.91 1.157 1.6 4.1 0.53 U1385D-15H-3, 120-121 143.3 1270.6 1.291 2.9 3.81 0.58 U1385D-15H-3, 129-130 143.39 1271.3 1.16 1.6 4.02 0.46 U1385D-15H-3, 141-142 143.51 1272.23 1.262 2.6 3.92 0.62 U1385D-15H-4, 1-2 143.64 1273.24 1.122 1.2 3.83 0.18 d180 from U1385D-15H-4, 0-1. d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 10-11 143.73 1273.94 1.102 1 3.78 0.08 U1385D-15H-4, 20-21 143.83 1274.72 1.486 4.9 3.65 0.91 d180 from U1385D-15H-4, 21-22. d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 31-32 143.94 1275.57 1.209 2.1 3.5 0.07 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 41-42 144.04 1276.34 1.424 4.2 3.62 0.72 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 51-52 144.14 1277.12 1.179 1.8 3.67 0.16 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 59-60 144.22 1277.74 1.2 2 3.49 0.04 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 62-63 144.25 1277.97 1.206 2.1 3.73 0.29 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-4, 71-72 144.34 1278.67 1.344 3.4 3.66 0.56 U1385D-15H-4, 81-82 144.44 1279.45 1.351 3.5 3.53 0.45 U1385D-15H-4, 90-91 144.53 1280.15 1.341 3.4 3.71 0.61 U1385D-15H-4, 100-101 144.63 1280.92 1.301 3 3.89 0.69 U1385D-15H-4, 115-116 144.78 1282.78 1.337 3.4 3.68 0.57 U1385D-15H-4, 120-121 144.83 1283.41 1.401 4 3.81 0.86 U1385D-15H-4, 125-126 144.88 1284.04 1.405 4 3.69 0.75 U1385D-15H-4, 130-131 144.93 1284.68 1.292 2.9 3.75 0.53 U1385D-15H-4, 135-136 144.98 1285.31 1.155 1.6 3.86 0.3 U1385D-15H-4, 140-141 145.03 1285.95 1.087 0.9 4.35 0.61 U1385D-15H-4, 145-146 145.08 1286.58 1.192 1.9 3.93 0.46 U1385D-15H-5, 0-1 145.15 1287.47 1.067 0.7 4.1 0.31 U1385D-15H-5, 5-6 145.2 1288.1 1.148 1.5 3.96 0.38 U1385D-15H-5, 5-6 145.2 1288.1 1.139 1.4 4.03 0.42 U1385D-15H-5, 5-6 145.2 1288.1 1.16 1.6 4.03 0.48 U1385D-15H-5, 10-11 145.25 1288.74 1.121 1.2 4.24 0.59 U1385D-15H-5, 16-17 145.31 1289.5 1.333 3.3 4.02 0.9 U1385D-15H-5, 20-21 145.35 1290.01 1.216 2.2 4.12 0.7 U1385D-15H-5, 25-26 145.4 1290.64 1.222 2.2 4.18 0.78 U1385D-15H-5, 30-31 145.45 1291.27 1.086 0.9 4.19 0.45 U1385D-15H-5, 35-36 145.5 1291.91 1.14 1.4 4.22 0.61 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-5, 40-41 145.55 1292.54 1.211 2.1 4.33 0.91 U1385D-15H-5, 46-47 145.61 1293.3 1.071 0.7 3.3 -0.48 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-5, 50-51 145.65 1293.81 1.092 0.9 4.62 0.9 U1385D-15H-5, 55-56 145.7 1294.44 0.993 -0.1 4.45 0.48 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-5, 55-56 145.7 1294.44 1.035 0.3 4.48 0.61 U1385D-15H-5, 60-61 145.75 1295.08 1.047 0.5 4.59 0.76 U1385D-15H-5, 66-67 145.81 1295.84 0.919 -0.8 4.57 0.41 U1385D-15H-5, 70-71 145.85 1296.35 1.103 1 4.39 0.7 U1385D-15H-5, 76-77 145.91 1297.11 1.112 1.1 4.35 0.68 U1385D-15H-5, 76-77 145.91 1297.11 1.118 1.2 4.38 0.72 U1385D-15H-5, 80-81 145.95 1297.62 1.119 1.2 4.29 0.63 U1385D-15H-5, 85-86 146 1298.25 0.993 -0.1 4.29 0.32 U1385D-15H-5, 85-86 146 1298.25 1.044 0.4 4.31 0.47 U1385D-15H-5, 85-86 146 1298.25 1.025 0.2 4.42 0.52 U1385D-15H-5, 90-91 146.05 1298.58 1.401 4 4.18 1.22 U1385D-15H-5, 95-96 146.1 1298.91 0.986 -0.1 4.48 0.49 U1385D-15H-5, 100-101 146.15 1299.24 0.991 -0.1 4.54 0.56 U1385D-15H-5, 109-112 146.25 1299.9 1.097 1 4.35 0.64 Combined Samples (109-110 & 111-112). d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-5, 130-131 146.45 1301.22 0.969 -0.3 4.28 0.25 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-5, 139-140 146.54 1301.81 1.156 1.6 3.9 0.34 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385D-15H-6, 20-21 146.87 1303.99 1.14 1.4 4.35 0.75 U1385D-15H-6, 40-41 147.02 1304.97 1.036 0.4 4.24 0.37 U1385D-15H-6, 40-41 147.03 1305.04 1.224 2.2 4.17 0.78 U1385D-15H-6, 60-61 147.17 1305.96 1.168 1.7 4.1 0.56 U1385D-15H-6, 60-61 147.17 1305.96 1.071 0.7 4.06 0.29 U1385D-15H-6, 80-81 147.31 1306.89 1.007 0.1 4.1 0.16 U1385E-16H-5, 60-61 147.33 1307.02 1.018 0.2 4.18 0.27 U1385E-16H-5, 80-81 147.5 1308.14 1.159 1.6 4.13 0.57 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-5, 100-101 147.67 1309.26 1.087 0.9 3.88 0.14 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-5, 120-121 147.84 1310.38 1.287 2.9 3.67 0.43 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-5, 140-141 148.01 1311.5 1.526 5.3 3.79 1.15 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-6, 0-1 148.14 1312.36 1.235 2.3 4.2 0.83 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-6, 20-21 148.41 1314.14 1.198 2 3.96 0.5 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-6, 40-41 148.56 1315.12 1.178 1.8 3.7 0.19 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-6, 60-61 148.72 1316.15 1.334 3.3 3.64 0.52 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil U1385E-16H-6, 80-81 148.88 1317.18 1.467 4.7 3.57 0.78 d18O U. pereg value is d18O C. wuellerstorfi + 0.64 per mil