Reconstructions of paleo winter sea ice concentrations and revised age models for marine sediment cores SO136-111 and E27-23.

The Holocene sea-ice project brings together for the first time, records from the Antarctic continent and deep sea sediments that will allow us to calibrate three sea-ice extent surrogates, validate their use in contrast to satellite observations and explore climatic influence on the physio-ecological environment over the last 10,000 years.

Spreadsheet 1 (appendix A): Complete list of Accelerator Mass Spectrometry (AMS) dating completed on E27-23 from various identified sources with original 14CAge and reported error. Three dates identified as Burckle pers comm. here were provided by Dr Lloyd Burckle (LDEO) to Dr L. Armand for this work. Outlier attributions are identified; the term Averaged identifies the two samples where final calibrated dates were averaged in this work. All remaining AMS dates were converted to calendar ages using the linear-based CALIB07 (Stuiver and Reimer, 1993) with calibration to the Marine13 dataset (Reimer et al., 2013) at 95% confidence (sigma 2) and included a correction for the surface water reservoir age of ~752 years at the site of core E27-23 resolved from the marine radiocarbon reservoir correction database and software available from http://radiocarbon.LDEO.columbia.edu/ (Butzin et al., 2005). The percent Marine Carbon relative attribution is provided. The Median age (Cal Yr BP) used as the final age at each respective (mid) depth is provided.

In Appendix A the dates are all ages in years, however some are uncalibrated ages and others are Cal yr BP (= calendar years before present).

So in terms of headings in Table A:

Raw 14C age yr BP - is the raw age provided by radiocarbon dating without any corrections applied. It is in years before present.

Corrected raw age (RA=752) - is the raw age with a local RA (Reservoir Age) correction applied and is still in years before present.

The remaining ages are calendar years before present having been calibrated.

All formats follow recommendations for reporting raw 14C dates and their calibration ages.

Spreadsheet 2 (appendix B): Comparison of calibration output from the input of accepted 14C dates using OXCAL 4.2 (Bronk Ramsey 2009; Blaauw 2010), and CALIB07 (Stuiver and Reimer, 1993), both using the Marine13 calibration curve (Reimer et al., 2013) at 95.4% confidence (sigma 2) and including a correction for the surface water reservoir age of ~752 years at the site of core E27-23. The calibration output difference between the median Cal Yr BP, regardless of calibration method employed, was greater than or equal to 40 Cal Yr BP. Calibration data from the output of CALIB07 has been used in this paper to determine chronostratigraphy.

Spreadsheet 3 (appendix C): The foraminiferal stable isotope data from E27-23. Ratios of oxygen (delta 18O) measured from the planktonic foraminifer Neogloboquadrina pachyderma sinistral (greater than 150 microns). Isotope values are reported as per mil (%) deviations relative to the Vienna Peedee Belemnite (VPDB).

Spreadsheet 4 (appendix D): The paleo winter sea-ice concentration (wSIC) estimates for marine sediment core SO136-111. The calendar ages, in thousands of years before present (kyr BP), are provided for each sample from core SO136-111. For each of the samples in core SO136-111, we have provided the estimates winter sea-ice concentration (%), along with the associated lower and upper bounds for the 95% confidence interval around the estimated winter sea-ice concentration (%), for both GAM/WSI/13 and GAM/WSI/ETS. The final two columns provide the estimated average annual monthly sea-ice cover for each sample within core SO136-111, originally estimated using the Modern Analogue Technique, by Crosta et al. (2004). Finally, we provide the estimated summer sea surface temperature, again using the Modern Analogue Technique, from Crosta et al. 2004.

Spreadsheet 5 (appendix E): The paleo wSIC estimates for marine sediment core E27-23. The calendar ages, in thousands of years before present are provided for each sample from core E27-23. For each of the samples in core E27-23, we have provided the estimated winter sea-ice concentration (%), along with the associated lower and upper bounds for the 95% confidence interval around the estimates for winter sea-ice concentration (%).

Identification info

Alternate title: Reconstructions of paleo winter sea ice concentrations and revised age models for marine sediment cores SO136-111 and E27-23.

Date (Publication): 2015-10-27

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.4225/15/546C10AD26A7D

Originator

Ferry, A., Crosta, X., Quilty, P.G., Fink, D., Howard, W. and Armand, L.K.

Publisher

Australian Antarctic Data Centre

Principal investigator

FERRY, ALEXANDER

Department of Biological Sciences

Climate Futures

Macquarie University

North Ryde

NSW

2109

Australia

Principal investigator

CROSTA, XAVIER

Universite de Bordeaux

Avenue des Facultes

Talence

Cedex

33405

France

Principal investigator

QUILTY, PATRICK G.

School of Earth Sciences

GPO BOX 252-79

University of Tasmania

Hobart

Tasmania

7001

Australia

Principal investigator

FINK, DAVID

Institute for Environmental Research

Australian Nuclear Science and Technology Organisation

PMB 1

Menai

New South Wales

2234

Australia

Principal investigator

HOWARD, WILLIAM

School of Earth Sciences

University of Melbourne

Melbourne

Victoria

3010

Australia

Principal investigator

ARMAND, LEANNE KAY

Climate Risk CORE

Department of Biological Sciences

Macquarie University

North Ryde

NSW

2109

Australia

+61 2 9850 8351

+61 2 9850 8245 (facsimile)

Collaborator

FERRY, ALEXANDER

Department of Biological Sciences

Climate Futures

Macquarie University

North Ryde

NSW

2109

Australia

Collaborator

ARMAND, LEANNE KAY

Climate Risk CORE

Department of Biological Sciences

Macquarie University

North Ryde

NSW

2109

Australia

+61 2 9850 8351

+61 2 9850 8245 (facsimile)

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/ASAC_2534_winter_sea_ice

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Topic category

Oceans

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 2010-09-05 2014-08-31

Title: USNS ELTANIN. An inventory of core location data with core location maps and cruise 55 core descriptions.

Date (Publication): 1977

Citation identifier: 44

Author

Cassidy, D.S., F.A., Kaharoeddin, I., Zemmels, M.B., Knapp

Publisher

Unknown

Tallahassee

Name: Antarctic Research Facility

Title: Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS.

Date (Publication): 2000

Author

Comiso, J.

Title: Application of modern analog technique to marine Antarctic diatoms: Reconstruction of maximum sea-ice extent at the Last Glacial Maximum.

Date (Publication): 1998

Citation identifier: 13

Author

Crosta, X., J-J., Pichon, and L.H., Burckle

Name: Palaeoceanography

Page: 284-297

Title: Nutrient cycling in the Indian sector of the Southern Ocean over the last 50,000 years.

Date (Publication): 2005

Citation identifier: 19

Citation identifier: doi:10.1029/2004GB002344

Author

Crosta, X., A., Shemesh, J., Etourneau, R., Yam, I., Billy, and J-J., Pichon

Name: Global Biogeochem. Cycles

Title: Late Quaternary sea ice history in the Indian sector of the Southern Ocean as recorded by diatom assemblages

Date (Publication): 2004

Citation identifier: 50

Author

Crosta, X., A., Sturm, L., Armand, and J-J., Pichon

Name: Mar. Micropaleontol

Page: 209-223

Title: First records of winter sea-ice concentration in the southwest Pacific sector of the Southern Ocean

Date (Publication): 2015

Citation identifier: doi:10.1002/2014PA002764