# South Atlantic Coccolith Assemblage and Morphology Data from the Early Oligocene #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/37661 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-ocean-37661.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleoceanography # # Dataset_DOI: 10.25921/v1pb-vb30 # # Science_Keywords: Milankovitch, biogeography #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleocean/atlantic/ma2023/ma2023-dsdp522_perc_abund.txt # Data_Download_Description: NOAA Template File; Coccolith Assemblage Data # #--------------------------------------- # Contribution_Date # Date: 2023-02-27 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-04-12 #--------------------------------------- # Title # Study_Name: South Atlantic Coccolith Assemblage and Morphology Data from the Early Oligocene #--------------------------------------- # Investigators # Investigators: Ma, Ruigang; Liu, Chuanlian; Jin, Xiaobo #--------------------------------------- # Description_Notes_and_Keywords # Description: The dataset includes coccolithophores morphology and assemblage from the South Atlantic Ocean, early Oligocene (~32.8-33.1 Ma). The data are derived from 45 marine sediment samples collected at DSDP Site 522, Core 33. The first dataset is the relative abundances (%) of different species/genera of coccolithophores. The second dataset is the morphology record (size, given in µm) that obtained by measuring 100, 30 and 30 specimens of coccolithophore genra Reticulofenestra, Dictyococcites and Coccolithus, repectively. #--------------------------------------- # Publication # Authors: Ma, R.; Jin, X.; Liu C. # Published_Date_or_Year: 2023-04-01 # Published_Title: High-resolution coccolithophores morphologic changes in response to orbital forcings during early Oligocene # Journal_Name: Geochemistry, Geophysics, Geosystems # Volume: 24 # Edition: # Issue: 4 # Pages: # Report_Number: e2022GC010746 # DOI: 10.1029/2022GC010746 # Online_Resource: # Full_Citation: # Abstract: Early Oligocene global climate was characterized by initiated Antarctic glaciation and meridional overturning circulation, which then led to profound eutrophication in the upper ocean. Generating a high-resolution coccolith record help to understand the responses of the marine phytoplankton to the newly established environment. Using highly resolved (~6 kyr time-resolution) marine sediment samples from Deep Sea Drilling Project Site 522 in the South Atlantic Ocean, we conducted a comprehensive morphologic study on coccoliths from the genera Reticulofenestra, Dictyococcites and Coccolithus, that dominated the interval between ~33.1 to 32.8 Ma. Our results showed that the size variations of three measured genera are significantly correlated (p<0.01) to each other, indicating homogeneous responses to the environmental changes. Moreover, spectrum analysis on integrated morphologic data of all measured coccoliths showed distinct obliquity (~40-kyr) and precession (~23-kyr and ~18-kyr) cycles. We suggest that these variations were mainly driven by temperate, short-term ecological fluctuations, which periodically altered the nutrient condition in the common living habitats for the studied coccolithophores. We proposed two tentative explanations focusing on the obliquity signal. First, the cyclic variation could result from obliquity-modulated ice volume changes and variations in ocean circulation intensity, which influenced nutrient export from deep waters to the upper ocean. Alternatively, the changes in coccolith size may indicate the strength of seasonality that influenced the upper ocean mixing on the west coast of South Africa. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 41930536 #--------------------------------------- # Site_Information # Site_Name: DSDP 522 # Location: South Atlantic Ocean # Northernmost_Latitude: -26.114 # Southernmost_Latitude: -26.115 # Easternmost_Longitude: 5.129 # Westernmost_Longitude: 5.128 # Elevation_m: -4441 #--------------------------------------- # Data_Collection # Collection_Name: DSDP522_perc_abund # First_Year: 33101670 # Last_Year: 32823050 # Time_Unit: calendar year before present # Core_Length_m: 148.7 # Parameter_Keywords: other # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## Depth depth,,,meter,,Paleoceanography,,,N, ## Age age,,,million years ago,,Paleoceanography,,,N, ## Reticulofenestra identified coccolithophore,,,percent,,Paleoceanography,,,N,Reticulofenestra including Cy.floridanus ## C.pelagicus identified coccolithophore,,,percent,,Paleoceanography,,,N,C.pelagicus ## Dictyococcites identified coccolithophore,,,percent,,Paleoceanography,,,N,Dictyococcites ## Coccolithus_formosus identified coccolithophore,,,percent,,Paleoceanography,,,N,Coccolithus formosus ## Helicosphaera identified coccolithophore,,,percent,,Paleoceanography,,,N,Helicosphaera ## Discoaster identified coccolithophore,,,percent,,Paleoceanography,,,N,Discoaster ## Sphenolithus identified coccolithophore,,,percent,,Paleoceanography,,,N,Sphenolithus ## R.umbilicus identified coccolithophore,,,percent,,Paleoceanography,,,N,R.umbilicus ## C.subdistichus identified coccolithophore,,,percent,,Paleoceanography,,,N,C.subdistichus ## Others identified coccolithophore,,,percent,,Paleoceanography,,,N,Others including Triquetrorhabdulus Zygrhablithus and Catinaster etc. #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: Depth Age Reticulofenestra C.pelagicus Dictyococcites Coccolithus_formosus Helicosphaera Discoaster Sphenolithus R.umbilicus C.subdistichus Others 126.37 32.82305 71.856287 4.79041916 11.0778 1.1976 0 1.7964 7.1856 0.2994 1.1976 0.5988 126.42 32.82843 72.378517 3.83631714 8.95141 0.2558 0 1.2788 10.23 0 2.8133 0.2558 126.48 32.8349 65.384615 6.49038462 15.1442 0.4808 0 1.9231 7.9327 0.2404 2.4038 0 126.53 32.84028 67.365269 6.88622754 8.38323 4.1916 0 0.5988 7.1856 0.5988 4.7904 0 126.57 32.84459 69.66967 5.10510511 9.00901 0.3003 0 1.8018 9.9099 0.3003 3.9039 0 126.62 32.84997 66.200466 6.06060606 6.75991 0.9324 0.6993 1.6317 12.121 0.4662 4.1958 0.9324 126.67 32.85536 68.051948 5.97402597 4.41558 1.5584 0.2597 1.8182 13.506 0.2597 4.1558 0 126.73 32.86182 67.326733 9.24092409 5.94059 1.3201 0 2.9703 9.571 0.33 3.3003 0 126.78 32.867 71.381579 4.27631579 7.23684 1.9737 0.9868 0.6579 6.9079 0.3289 4.2763 1.9737 126.83 32.87259 73.913043 6.08695652 5.50725 2.029 0 1.4493 5.2174 0.5797 4.3478 0.8696 126.92 32.88228 68.367347 6.8877551 5.35714 2.8061 0 1.7857 5.3571 1.2755 7.6531 0.5102 126.98 32.88875 71.076923 7.07692308 4.61538 1.2308 0 1.2308 4.6154 0.9231 7.3846 1.8462 127.03 32.89413 67.320261 9.47712418 3.26797 3.9216 0 1.9608 6.5359 0.3268 5.8824 1.3072 127.06 32.897 69.444444 6.38888889 3.05556 3.6111 0 2.2222 5.2778 0.5556 7.5 1.9444 127.11 32.90275 68.404908 7.97546012 3.98773 2.7607 0 0.6135 7.0552 0.9202 8.2822 0 127.18 32.91029 73.351648 5.49450549 3.2967 0.8242 0 0.8242 7.967 1.0989 6.8681 0.2747 127.23 32.91567 55.948553 11.5755627 9.6463 3.8585 0 0.6431 9.0032 0.9646 6.4309 1.9293 127.29 32.92213 60.596026 13.2450331 6.62252 2.9801 0 0.9934 4.6358 2.9801 5.9603 1.9868 127.34 32.92752 62.5 8.22368421 11.5132 3.2895 0.6579 1.6447 5.2632 1.3158 3.9474 1.6447 127.39 32.9329 71.525424 5.08474576 9.15254 0.339 0 0.339 5.7627 2.0339 4.0678 1.6949 127.44 32.93829 75.375375 4.8048048 3.3033 0.3003 0 0.3003 8.4084 0.3003 4.5045 2.7027 127.51 32.94583 63.002681 7.50670241 8.31099 1.6086 0 1.8767 8.311 1.6086 6.7024 1.0724 127.57 32.95229 68.480726 5.66893424 7.93651 2.9478 0 1.3605 5.6689 0.6803 6.1224 1.1338 127.63 32.95875 62.402089 12.2715405 6.52742 1.3055 1.0444 0.7833 6.0052 1.0444 7.0496 1.5666 127.75 32.975 70.132743 6.63716814 6.63717 0.6637 0.4425 1.7699 5.3097 1.7699 5.531 1.1062 127.83 32.985 59.666667 7.33333333 10.3333 1.3333 0.6667 2.3333 10.333 1 4.3333 2.6667 127.88 32.989 62.650602 5.72289157 14.759 0.3012 1.2048 1.506 10.542 0.3012 2.4096 0.6024 127.93 32.993 68.847352 6.85358255 7.16511 0.3115 1.2461 1.2461 7.1651 0.3115 6.8536 0 128.00 32.9986 63.131313 6.56565657 10.101 0.5051 1.0101 2.5253 9.8485 0.5051 3.5354 2.2727 128.06 33.00506 76.875 4.0625 5.9375 0 0 0.9375 5.625 0.3125 5.625 0.625 128.12 33.01152 81.168831 4.87012987 4.54545 0 0 0.3247 5.5195 0.3247 2.5974 0.6494 128.14 33.01368 67.346939 7.14285714 8.41837 0.2551 0.7653 1.0204 7.1429 0.2551 3.5714 4.0816 128.20 33.02014 67.676768 5.72390572 13.468 2.3569 0.3367 1.3468 6.734 0.3367 0.6734 1.3468 128.27 33.02768 75.433526 6.3583815 8.09249 0.578 0.8671 0.289 4.0462 0.289 2.6012 1.4451 128.33 33.03414 65.625 5.90277778 9.375 0.6944 1.0417 1.0417 10.069 0.6944 3.125 2.4306 128.40 33.04168 72.049689 6.21118012 9.62733 0.6211 0.6211 0.3106 4.0373 0.9317 3.4161 2.1739 128.47 33.04922 55.717762 9.9756691 18.0049 0.4866 0.2433 2.1898 5.3528 0.9732 5.1095 1.9465 128.60 33.06158 69.300912 5.47112462 6.99088 0 0.6079 0.6079 4.8632 0.304 9.7264 2.1277 128.68 33.0684 66.835443 6.58227848 7.08861 0.5063 0.7595 1.519 6.3291 0.7595 8.3544 1.2658 128.74 33.07352 64.451827 7.97342193 10.9635 0.6645 0 0.9967 4.3189 0.3322 8.3056 1.9934 128.82 33.08035 67.721519 7.91139241 6.64557 0.6329 0 0.6329 8.8608 0.6329 6.0127 0.9494 128.87 33.08461 64 9.6 10.4 0.5333 0 0.8 8.8 0.8 4 1.0667 128.95 33.09144 65.527066 5.41310541 10.8262 1.4245 1.4245 0.2849 7.1225 0.5698 6.2678 1.1396 129.01 33.09655 55.01355 13.2791328 8.13008 1.897 0.813 1.626 11.111 0.813 6.7751 0.542 129.07 33.10167 60.703812 9.97067449 9.38416 0.5865 0 2.346 8.7977 0.5865 6.4516 1.173