# Florida Straits Cadmium and Mg/Li-Derived Intermediate Water Temperature Data over the past 2000 years #----------------------------------------------------------------------- # 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.ncdc.noaa.gov/access/paleo-search/study/36153 # 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-recon-36153.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Climate Reconstructions # # Dataset_DOI: 10.25921/dt5g-my32 # # Science_Keywords: Atmospheric and Oceanic Circulation Patterns Reconstruction, Medieval Warm Period #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/reconstructions/valley2022/valley2022-knr166-262mc-a.txt # Data_Download_Description: NOAA Template File; Cadmium and Mg/Li-Derived Intermediate Water Temperature Data # #--------------------------------------- # Contribution_Date # Date: 2022-03-14 #--------------------------------------- # File_Last_Modified_Date # Date: 2022-07-08 #--------------------------------------- # Title # Study_Name: Florida Straits Cadmium and Mg/Li-Derived Intermediate Water Temperature Data over the past 2000 years #--------------------------------------- # Investigators # Investigators: Valley, Shannon (https://orcid.org/https://orcid.org/0000-0002-9214-2895); Lynch-Stieglitz, Jean (https://orcid.org/https://orcid.org/0000-0002-9353-1972); Marchitto, Thomas (https://orcid.org/https://orcid.org/0000-0003-2397-8768); Oppo, Delia (https://orcid.org/https://orcid.org/0000-0003-2946-5904) #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Little Ice Age, Common Era, intermediate water temperature #--------------------------------------- # Publication # Authors: Valley, S.G., Lynch-Stieglitz, J., Marchitto, T.M., and Oppo, D.W. # Published_Date_or_Year: 2022-05-01 # Published_Title: Seawater Cadmium in the Florida Straits over the Holocene and implications for Upper AMOC Variability # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 37 # Edition: # Issue: 5 # Pages: # Report_Number: e2021PA004379 # DOI: 10.1029/2021PA004379 # Online_Resource: # Full_Citation: # Abstract: Atlantic Meridional Overturning Circulation (AMOC) plays a central role in the global redistribution of heat and precipitation during both abrupt and longer-term climate shifts. Over the next century, AMOC is projected to weaken due to greenhouse gas warming, though projecting its future behavior is dependent on a better understanding of how AMOC changes are forced. Seeking to resolve an apparent contradiction of AMOC trends from paleorecords of the more recent past, we reconstruct seawater cadmium, a nutrient-like tracer, in the Florida Straits over the last ~8,000 years, with emphasis on the last millennium. The gradual reduction in seawater Cd over the last 8,000 years could be due to a reduction in AMOC, consistent with cooling Northern Hemisphere temperatures and a southward shift of the Intertropical Convergence Zone. However, it is difficult to reconcile this finding with evidence for an increase in geostrophic flow through the Florida Straits over the same time period. We combine data from intermediate water depth sediment cores to extend this record into the Common Era at sufficient resolution to address the broad scale changes of this time period. There is a small decline in the Cd concentration in the Late Little Ice Age relative to the Medieval Climate Anomaly, but this change was much smaller than the changes observed over the Holocene and on the deglaciation. This suggests that any trend in the strength of AMOC over the last millennium must have been very subtle. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: Florida Straits - Core KNR166-2 62MC-A # Location: North Atlantic Ocean # Northernmost_Latitude: 24.326667 # Southernmost_Latitude: 24.326667 # Easternmost_Longitude: -83.256667 # Westernmost_Longitude: -83.256667 # Elevation_m: -547 #--------------------------------------- # Data_Collection # Collection_Name: KNR166-2 62MC-A_valley2022 # First_Year: 695 # Last_Year: -52 # Time_Unit: calendar year before present # Core_Length_m: # Parameter_Keywords: trace metals in carbonates # Notes: Ages for core KNR 166-2 62MC-A are reconstructed from radiocarbon dates reported in Lund, D. C., & Curry, W. B., Florida Current surface temperature and salinity variability during the last millennium. Paleoceanography 21, PA2009, doi:10.1029/2005PA001218 (2006). #--------------------------------------- # 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,,,centimeter,,paleoceanography; climate reconstructions,,,N, ## age age,,,calendar year before present,,paleoceanography; climate reconstructions,,,N, ## Cd/Ca cadmium/calcium,benthic foraminifer,,micromole per mole,,paleoceanography,,inductively-coupled plasma mass spectrometry,N,Hoeglundina elegans ## sw_Cd cadmium,,,nanomole per kilogram,,paleoceanography,,regression analysis,N, ## outlier_flag_Cd notes,,,count,,paleoceanography,,,N,Cadmium outliers beyond 2 standard deviations of a Lowess smoothed time series are indicated 1 and omitted from interpretation in related publication. ## Mg/Li magnesium/lithium,benthic foraminifer,,mole per milimole,,paleoceanography,,inductively-coupled plasma mass spectrometry,N,Hoeglundina elegans ## temp sea water temperature,magnesium/lithium,,degree Celsius,,paleoceanography; climate reconstructions,,regression analysis,N, ## outlier_flag _T notes,,,count,,paleoceanography,,,N,Temperature outliers beyond 2 standard deviations of a Lowess smoothed time series are indicated 1 and omitted from interpretation in related publication. #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: depth age Cd/Ca sw_Cd outlier_flag_Cd Mg/Li temp outlier_flag _T 0.25 0 0.0261 0.261 1 0.194 2.15 1 1.25 28 0.0390 0.390 0.031 -5.40 1 1.75 46 0.0404 0.404 0.185 1.69 1 2.25 65 0.0395 0.395 0.274 6.30 2.25 65 0.0356 0.356 0.282 6.78 2.75 83 0.0358 0.358 0.281 6.71 3.25 101 0.0567 0.567 1 0.265 5.81 3.75 120 0.0339 0.339 NaN NaN 4.75 157 0.0393 0.393 NaN NaN 4.75 157 0.0362 0.362 0.278 6.54 5.25 175 0.0352 0.352 NaN NaN 5.75 194 0.0332 0.332 NaN NaN 6.25 212 0.0382 0.382 NaN NaN 6.75 230 0.0432 0.432 NaN NaN 7.25 249 0.0427 0.427 NaN NaN 7.25 249 0.0366 0.366 0.272 6.19 7.75 267 0.0366 0.366 NaN NaN 8.25 286 0.0469 0.469 NaN NaN 8.25 286 0.0385 0.385 0.281 6.72 8.75 304 0.0393 0.393 NaN NaN 9.25 323 0.0363 0.363 NaN NaN 9.75 341 0.0397 0.397 0.368 11.77 1 10.25 360 0.0424 0.424 0.270 6.10 10.75 378 0.0422 0.422 0.270 6.12 11.75 401 0.0421 0.421 0.297 7.57 12.25 413 0.0318 0.318 0.279 6.60 12.75 424 0.0344 0.344 0.289 7.11 13.25 436 0.0427 0.427 0.275 6.38 13.75 447 0.0433 0.433 0.274 6.30 13.75 447 0.0435 0.435 0.271 6.16 14.25 459 0.0413 0.413 0.271 6.15 14.75 470 0.0438 0.438 0.282 6.74 15.25 482 0.0431 0.431 0.292 7.32 15.75 493 0.0347 0.347 0.297 7.61 15.75 493 0.0324 0.324 0.275 6.39 16.25 505 0.0361 0.361 0.278 6.51 16.25 505 0.0371 0.371 0.253 5.20 16.75 516 0.0472 0.472 1 0.319 8.83 1 16.75 516 0.0368 0.368 0.274 6.29 17.25 528 0.0398 0.398 0.274 6.31 17.75 539 0.0388 0.388 0.274 6.30 17.75 539 0.0365 0.365 0.263 5.73 18.25 551 0.0382 0.382 0.276 6.40 18.25 551 0.0380 0.380 0.278 6.52 18.75 562 0.0339 0.339 0.270 6.08 19.25 574 0.0387 0.387 0.275 6.39 19.25 574 0.0382 0.382 0.273 6.24 19.75 585 0.0369 0.369 0.271 6.13 20.25 597 0.0428 0.428 0.279 6.56 20.75 608 0.0359 0.359 0.278 6.52 20.75 608 0.0356 0.356 0.280 6.66 21.25 620 0.0395 0.395 0.273 6.27 21.25 620 0.0356 0.356 0.268 5.98 21.75 631 0.0374 0.374 0.259 5.49 21.75 631 0.0343 0.343 0.263 5.70 22.25 643 0.0347 0.347 0.264 5.79 22.25 643 0.0353 0.353 0.271 6.16 22.75 654 0.0333 0.333 0.271 6.13 22.75 654 0.0314 0.314 0.284 6.87 23.25 666 0.0467 0.467 0.272 6.23 23.75 677 0.0357 0.357 0.263 5.71 23.75 677 0.0366 0.366 0.258 5.44 24.25 689 0.0369 0.369 0.264 5.76 24.25 689 0.0381 0.381 0.269 6.03 24.75 700 0.0401 0.401 0.264 5.78 24.75 700 0.0379 0.379 0.259 5.49 25.25 712 0.0355 0.355 0.272 6.23 25.75 723 0.0390 0.390 0.273 6.28 25.75 723 0.0378 0.378 0.269 6.04 26.25 735 0.0374 0.374 0.276 6.45 26.75 746 0.0371 0.371 0.272 6.23 27.25 758 0.0408 0.408 0.271 6.14 27.75 769 0.0417 0.417 0.274 6.32 27.75 769 0.0404 0.404 0.272 6.21 28.25 781 0.0443 0.443 0.262 5.65 28.25 781 0.0416 0.416 0.264 5.76 28.75 792 0.0395 0.395 0.263 5.72 29.25 804 0.0372 0.372 0.274 6.31 29.75 816 0.0379 0.379 0.266 5.91