noaa-ocean-14169 Healy-Oden Trans Arctic Expedition(HOTRAX) Grain Size, XRF, and Reflectance Data Ortiz, J.D. ; Polyak, L.; Darby, D. Healy-Oden Trans Arctic Expedition(HOTRAX) Grain Size, XRF, and Reflectance Data 2013-03-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/14169 Investigator J.D. Ortiz Investigator L. Polyak Investigator D. Darby earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean physical properties geoscientificInformation Arctic 8000 cal yr BP 2000 cal yr BP Complete 71.628034 78.2938 -176.98615 -156.627917 -1163 -90 Ocean Arctic Ocean HLY05-01-07TC>LATITUDE 72.299326>LONGITUDE -156.627917 Ocean Arctic Ocean HLY05-01-08TC>LATITUDE 71.628034>LONGITUDE -156.859142 Ocean Arctic Ocean HLY05-01-01TC>LATITUDE 72.905244>LONGITUDE -158.42049 Ocean Arctic Ocean HLY05-03-06JPC>LATITUDE 78.2938>LONGITUDE -176.98615 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Joseph D. Ortiz, Leonid Polyak, Jacqueline M. Grebmeier, Dennis Darby, Dennis D. Eberl, Sathy Naidu, Doron Nof. 2009. Provenance of Holocene sediment on the Chukchi-Alaskan margin based on combined diffuse spectral reflectance and quantitative X-Ray Diffraction analysis. Global and Planetary Change, Vol. 68, Issues 1-2, pp. 73-84. DOI: 10.1016/j.gloplacha.2009.03.020 Darby, D.A., J. Ortiz, L. Polyak, S. Lund, M. Jakobsson, R.A. Woodgate. 2009. The role of currents and sea ice in both slowly deposited central Arctic and rapidly deposited Chukchi-Alaskan margin sediments. Global and Planetary Change, Vol. 68, Issues 1-2, pp. 58-72. DOI: 10.1016/j.gloplacha.2009.02.007

Sediment clay and silt mineral assemblages provide an excellent means of assessing the provenance of fine-grained Arctic sediment especially when a unique mineral assemblage can be tied to specific source areas. The diffuse spectral reflectance (DSR) first derivative measurements and quantitative X-Ray Diffraction (qXRD) on a high-resolution sediment core from the continental slope north of Alaska constrain the sediment mineralogy. DSR results are augmented by measurements on several adjacent cores and compared to surface sediment samples from the northern Alaskan shelf and slope. Using Principal Component Analysis (PCA), we infer that the three leading DSR modes relate to mixtures of smectite + dolomite, illite + goethite, and chlorite + muscovite. This interpretation is consistent with the down core qXRD results. While the smectite + dolomite, and illite + goethite factors show increased variability down core, the chlorite + muscovite factor had highest positive loadings in the middle Holocene, between ca. 6.0 and 3.6 ka. Because the most likely source of the chlorite + muscovite suite in this vicinity lies in the North Pacific, we argue that the oscillations in chlorite + muscovite values likely reflect an increase in the inflow of Pacific water to the Arctic through the Bering Strait. The time interval of this event is associated in other parts of the globe with a non-linear response of the climate system to the decrease in insolation, which may be related to changes in water exchange between the Pacific and Arctic Ocean. STUDY NOTES: The Grainsize measurements were generated as follows: Dried sample measured with a Malvern Mastersizer 200 equipped with an MU Size fraction = <63um Samples were pre-sieved with a #18 screen mesh to prevent larger particles from becoming stuck in the instrument Sample were run in triplicate and averaged for each sample, with each measurement set to integrate for 5 minutes Irregular particle shape model Mie theory index of Refraction = quartz Opacity =1 Header information is as follows:expedition name and number core number, core device (TC = trigger core; PC = piston core), section number, depth in core in cm Thus the header for the HOTRAX Leg 1 expedition sample from Core 7PC section 1, 1 cm is as follows: HLY 0501 7JPC 1 1 The reflectance measurements were generated as follows: Dried sample measured with an ASD labspec Pro FR UV-VIS -NIR analyzer Size fraction = <63um sample integration = 250 spectra per measurement Sample size: >250 mg sediment wet filtered onto a 0.4 um GF/F filter, over dired at 60 deg C overnight Comparison of sample and blank values indicated that the sediment sample was sufficently thick to block absorption of reflectance fom the GF/F filter and thus required no blank correction Reflectance values are stored in files labeled by core name samples are identified by depth in core (columns) and wavelength (rows) The XRF elements measurements were generated as follows: Measurements were conducted at Ohio State University or Kent State University using the Kent State University Innov-X alpha series Handheld XRF scanner Measurements were conducted in soils mode with concentration determined by the default Compton scattering mode with a 60-90 second integration time merging standard and light element mode measurements All values are reported as ppm The reported values are the raw average value +/- 1 sigma. When the internal variability was greater than 3 sigma, the mean value is reported in the 1-sigma error column and flagged as below the limit of detection in the raw column. Values listed as "adjusted" include the best estimate of the <LOD values as the mean value in the adjusted column. The 1-sigma error is identical for these samples and is listed in the 1-sigma error column. The data was post-processed at Kent State to extract signal from theadjusted values using a varimax rotated, principle component analysis (VPCA). VPCA was used to extract the coherent part of all measurements from the data by partioning measurement from noise. Information on these methods are reported in the MS thesis by Siriwardana cited below. The values used as input for the VPCA are tabulated as adjusted values in the data table. Additional information about sample collection can be found from the data report, cruise website and thesis work by Chandawimal H.E.R. Siriwardana at KSU

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