Urvina Bay, Galapagos Coral Radiocarbon (delta 14C) Data for 1956 to 1982

Metadata:

• Identification_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information
• CoRIS

Identification_Information:

Citation:

Citation_Information:

Originator: T. Guilderson

Originator: D. Schrag

Publication_Date: 199909

Title:

Urvina Bay, Galapagos Coral Radiocarbon (delta 14C) Data for 1956 to 1982

Series_Information:

Series_Name: World Data Center for Paleoclimatology Data Contribution Series

Issue_Identification: 1999-051

Publication_Information:

Publication_Place: Boulder

Publisher: World Data Center for Paleoclimatology, Boulder

Description:

Abstract:

Urvina Bay coral radiocarbon (14C) timeseries. (90 deg W, 0.5 deg S) Coral radiocarbon (Delta-14C) on untreated, low-speed drilled samples. Precision is +/- 4 per mil as documented by an in-house homogenized coral standard, and presented as AGE CORRECTED DELTA-14C [see Stuiver Polach, 1977]. The sample cores were made on a Porites lobata coral, in Urvina Bay, Isabella Island, Galapagos Archipelago by G. Wellington, and supplied by R. Dunbar. Cores were split and cleaned with distilled water. After identifying the major vertical growth axis, the coral was sequentially sampled at 2 mm increments with a low-speed drill. Splits (~1 mg) were reacted in vacuo in a modified autocarbonate device at 90 deg C and the purified CO2 analyzed on a gas source stable isotope ratio mass spectrometer. The remaining sample splits (~7-8 mg) were placed in individual reaction chambers, evacuated, heated, and then acidified with orthophosphoric acid at 90 deg C. The evolved CO2 was purified, trapped, and converted to graphite in the presence of cobalt catalyst in individual reactors [Vogel et al., 1987]. Graphite targets were measured at the Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory [Davis et al., 1990]. Radiocarbon results are reported as Delta-14C (") as defined by Stuiver and Polach [1977] and include the d13C correction obtained from the stable isotope results. Analytical precision and accuracy of the radiocarbon measurements is +/- 4" (1s) based on repeated analyses of an in-house homogenized near-modern coral and accepted secondary and tertiary radiocarbon standards. The coral died during the 1982/83 El Nino event. In keeping with the definition of "high-precision radiocarbon" ( less than 3 per mil, 1-sigma) data have been rounded to zero significant figures. The age model for these data was derived from a preliminary delta-13C age model which was then optimized by mapping the delta-18O data to a local instrumental SST record. A similar result was obtained using high-precision [Sr/Ca] analyses on aliquots of the same drilled powders used for d18O,d13C, and Delta-14C. Age model errors are estimated (brute force approach) at +/- 1 month.

Purpose: Paleoclimatic Research

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1956

Ending_Date: 1982

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -90

East_Bounding_Coordinate: -90

North_Bounding_Coordinate: -0.5

South_Bounding_Coordinate: -0.5

Keywords:

Theme:

Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus

Theme_Keyword: EARTH SCIENCE > Paleoclimate > Coral Records > Radiocarbon

Theme_Keyword: EARTH SCIENCE > Paleoclimate > Coral Records > Delta 14C

Theme_Keyword: EARTH SCIENCE > Paleoclimate > Coral Records > Temperature

Theme_Keyword:

EARTH SCIENCE > Atmosphere > Atmospheric Phenomena > El Nino (ENSO)

Theme:

Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus

Theme_Keyword: Numeric Data Sets > Paleoclimatology

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: climatologyMeteorologyAtmosphere

Theme_Keyword: 004

Place:

Place_Keyword_Thesaurus: CoRIS Place Thesaurus

Place_Keyword:

OCEAN BASIN > Pacific Ocean > Eastern Pacific Ocean > Isabela Island > Urvina Bay (00S091W0001)

Place_Keyword:

COUNTRY/TERRITORY > Ecuador > Galapagos Islands > Urvina Bay (00S091W0001)

Temporal:

Temporal_Keyword_Thesaurus: CoRIS Temporal Thesaurus

Temporal_Keyword: Holocene, Modern

Access_Constraints: None

Use_Constraints: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA

Data_Set_Credit:

Guilderson, T.P., and D.P. Schrag, Abrupt shift in subsurface temperatures in the Eastern Tropical Pacific associated with recent changes in El Nino, Science, 281, 240-243 1998.

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: coral variable

Entity_Type_Definition: coral variable

Entity_Type_Definition_Source: coral variable

Attribute:

Attribute_Label: del14C

Attribute_Definition: delta 14C (per mil)

Attribute_Definition_Source:

Druffel, E. M., 1981, Radiocarbon in annual coral rings from the eastern tropical Pacific Ocean: Geophysical Research Letters, v. 8, p. 59-62.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: unknown

Range_Domain_Maximum: unknown

Attribute_Units_of_Measure: per mil

Attribute_Measurement_Resolution: 0.01

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Paleoclimatology Program

Contact_Position: Data Manager

Contact_Address:

Address_Type: Mailing Address

Address: 325 Broadway, Code E/CC23

City: Boulder

State_or_Province: Colorado

Postal_Code: 80305-3328

Country: U.S.A.

Contact_Voice_Telephone: (303) 497-6280

Contact_TDD/TTY_Telephone: (303) 497-6958

Contact_Facsimile_Telephone: (303) 497-6513

Contact_Electronic_Mail_Address: paleo@noaa.gov

Hours_of_Service: 9-5 MST Monday-Friday

Resource_Description: Other Documents

Distribution_Liability:

Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/urvina_bay_1999.txt>

Access_Instructions:

Data can be obtained from <http://www.ngdc.noaa.gov/paleo> and via anonymous ftp to ftp.ngdc.noaa.gov. Diskette and paper copies may be obtained by mail.

Offline_Option:

Offline_Media: Diskette

Recording_Format: cpio

Fees:

On-line data are available free of charge, other forms are available for the cost of reproduction

Ordering_Instructions: Contact the Data Center to order paper copies of data

Turnaround: 4 days

Metadata_Reference_Information:

Metadata_Date: 20110331

Metadata_Review_Date: 20110331

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: NOAA Paleoclimatology Program

Contact_Position: Data Manager

Contact_Address:

Address_Type: Mailing Address

Address: 325 Broadway, Code E/CC23

City: Boulder

State_or_Province: Colorado

Postal_Code: 80305-3328

Country: U.S.A.

Contact_Voice_Telephone: (303) 497-6280

Contact_TDD/TTY_Telephone: (303) 497-6958

Contact_Facsimile_Telephone: (303) 497-6513

Contact_Electronic_Mail_Address: paleo@noaa.gov

Hours_of_Service: 9-5 MST Monday-Friday

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: No Constraints

Metadata_Use_Constraints: No Constraints

CoRIS:

CoRIS_ID: 20020501111529

CoRIS_Children: None

CoRIS_Beginning_Date: 19560101

CoRIS_Ending_Date: 19821231

CoRIS_Metadata_Link:

<http://www.coris.noaa.gov/metadata/records/html/paleoclimatology_urvina_bay_1999.html>

CoRIS_Tracking_ID: 84