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

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Metadata:


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

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