South Atlantic Younger Dryas Cd/Ca and Cdw Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: South Atlantic Younger Dryas Cd/Ca and Cdw Data LAST UPDATE: 12/2003 (Original Receipt by WDC Paleo) CONTRIBUTOR: Rosemarie E. Came, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2003-087 SUGGESTED DATA CITATION: Came, R.E., et al., 2003, South Atlantic Younger Dryas Cd/Ca and Cdw Data, IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2003-087. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Came, R.E., D.W. Oppo, and W.B. Curry. 2003. Atlantic Ocean circulation during the Younger Dryas: Insights from a new Cd/Ca record from the western subtropical South Atlantic. Paleoceanography, Vol. 18, No. 4, 1086, doi:10.1029/2003PA000888. GEOGRAPHIC REGION: Western subtropical South Atlantic PERIOD OF RECORD: 21 KYrBP - present DESCRIPTION: Benthic foraminiferal Cd/Ca ratio data from core KNR159-5-36GGC, western subtropical South Atlantic (27.51S, 46.47W, 1268m. depth), and derived Cd (seawater), as a proxy for Younger Dryas North Atlantic Intermediate Water (NAIW) southward penetration. Three consistency standards were treated as samples in each of the six runs. Mean values for CS1, CS2, and CS3 are presented, along with standard deviations (Std Dev) and relative standard deviations (RSD). Cdw data are presented, along with Age, Depth, and mean Cdw. Rejected data points are presented in parentheses. ABSTRACT: Benthic foraminiferal Cd/Ca from an intermediate depth, western South Atlantic core documents the history of southward penetration of North Atlantic Intermediate Water (NAIW). Cd seawater estimates (CdW) for the last glacial are consistent with the production of NAIW and its export into the South Atlantic. At ~14.5 ka concurrently with the onset of the Bølling-Allerød to Younger Dryas cooling, the NAIW contribution to the South Atlantic began to decrease, marking the transition from a glacial circulation pattern to a Younger Dryas circulation. High CdW in both the deep North Atlantic and the intermediate South Atlantic imply reduced export of deep and intermediate water during the Younger Dryas and a significant decrease in northward oceanic heat transport. A modern circulation was achieved at ~9 ka, concurrently with the establishment of Holocene warmth in the North Atlantic region, further supporting a close linkage between deepwater variability and North Atlantic climate. DATA: 1. Mean, standard deviations (Std Dev), and relative standard deviations (RSD) for three consistency standards CS1, CS2, and CS3 (treated as samples). MEAN STD DEV RSD CS3 [Ca] 28.46239091 0.498358306 1.7509362 CS3 [Cd] 3.613902004 0.141643333 3.9194016 CS3 Cd/Ca 0.127081417 0.006961089 5.47766075 CS2 [Ca] 24.44752513 0.355138806 1.4526575 CS2 [Cd] 2.173288684 0.111861244 5.14709549 CS2 Cd/Ca 0.088893301 0.004323061 4.86320253 CS1 [Ca] 28.36942374 0.691563128 2.43770594 CS1 [Cd] 1.067109902 0.15926268 14.9246745 CS1 Cd/Ca 0.037599411 0.005529992 14.7076562 2. Seawater Cd (Cdw) estimates, with Age, Depth, and mean Cdw. Rejected data points are presented in parentheses. Age (kyr) Depth Cdw Mean Cdw 0.642 0.5 (0.9235133) 2.503 12 0.5447976 0.5447976 2.724 14 (1.0179633) 2.946 16 0.4922056 0.4922056 3.926 23 0.449062 0.449062 4.066 24 0.5368115 0.5368115 4.276 25.5 0.6399901 0.6399901 4.627 28 0.3349048 0.3349048 5.07 31 0.58454 0.58454 5.218 32 0.61931 0.61931 5.81 36 0.4789523 0.5166846 5.81 36 0.5544169 6.402 40 0.4218722 0.5023047 6.402 40 0.5827372 7.043 44 0.5674929 0.50655235 7.043 44 0.4456118 7.043 44 (0.8261097) 7.684 48 0.5932751 0.58455445 7.684 48 0.5758338 8.324 52 0.6312273 0.6312273 8.965 56 0.582386 0.582386 10.262 60 0.541464 0.541464 10.973 64 0.4836483 0.4700526 10.973 64 0.4564569 11.683 68 0.6347263 0.54125363 11.683 68 0.4729486 11.683 68 0.516086 12.104 72 0.5587862 0.5587862 12.524 76 0.5601881 0.5601881 12.945 80 0.534706 0.534706 13.31 84 0.5449492 0.5449492 13.674 88 0.4830338 0.4830338 13.927 92 0.4345378 0.4345378 14.515 96 0.3928272 0.3928272 15.103 100 0.4905128 0.4905128 15.691 104 0.4174333 0.4174333 15.75 108 0.4229322 0.4229322 15.808 112 0.3766595 0.3766595 15.999 116 0.4016755 0.4016755 16.19 120 0.3864572 0.3864572 16.381 124 0.4005561 0.4005561 16.572 128 0.3943877 0.3943877 16.762 132 0.3964352 0.3964352 16.953 136 0.3754268 0.3754268 17.192 141 0.3632745 0.3632745 17.452 144 0.3854069 0.3854069 17.8 148 0.4080725 0.4080725 18.147 152 0.3819965 0.3819965 18.494 156 0.4216572 0.4216572 18.841 160 0.2558201 0.2558201 19.188 164 0.31739 0.31739 19.536 168 0.4618405 0.4618405 19.883 172 0.3676075 0.3676075 20.23 176 0.4719577 0.4719577 20.577 180 0.4251911 0.4251911 20.924 184 0.4818397 0.4818397 21.271 188 0.3711655 0.3711655