North Iceland Shelf Carbonate and Foraminiferal Oxygen Isotope Data
Entry ID:
NOAA_NCDC_PALEO_2004-048
|
Summary
This dataset contains oxygen isotope data and percent total carbonate data for
nine sediment cores collected from the North Iceland shelf.
Methods: Cores were collected in the summer of 1997 aboard the Bjarni
Saemundsson's B997 cruise. The chronologies of all cores were determined by
AMS 14C dating of molluscs and foraminifera, and by tephrochronology. ...
Foraminifera for stable isotopic analysis were picked from the sieved 1000-106
um fraction after samples were sonicated. Between 10 and 20 individuals were
selected and only "clean" tests were picked. Stable isotope measurements were
made at the Leibniz-Laboratory for Radiomatric Dating and Stable Isotope
Research at Kiel University on a Finnigan MAT 251 mass-spectrometer with an
on-line coupled Kiel carbonate device. The carbon content of the sediment was
determined by analysis on a CM5012 CO2 Coulometer at the University of
Colorado, Boulder.
The region of north Iceland is highly sensitive climatically owing to its
location with respect to atmospheric and oceanographic fronts. In this study
we present total carbonate and d18O records of benthic and planktic
Foraminifera from nine sediment cores from the North Iceland Shelf. The
results of this work indicate that the deglaciation of the Vestfirdir
Peninsula was completed by 10,200 cal. yr BP. The 8200 cal. yr BP cold event
is present only as a minor isotopic event, and seems not to have had much of a
cooling effect on the bottom waters of the northwest Iceland shelf. The
Holocene maximum warmth, attributed to a stronger North Icelandic Irminger
Current, occurred between ca. 7800 and 6200 cal. yr BP. Over the past 4500
cal. yr BP a general cooling trend has occurred on the North Iceland Shelf,
and superimposed on this overall cooling trend are a number of oscillations
between periods when relatively warmer and cooler waters occupied the shelf.
Relatively cooler waters were present at 4200-4000 cal. yr BP, 3200-2900 cal.
yr BP, 2500-2350 cal. yr BP and 600-200 cal. yr BP, whereas relatively warmer
waters were present on the shelf at 3750-3450 cal. yr BP, 2800-2600 cal. yr BP
and 1700-1000 cal. yr BP.
Geographic Coverage
Spatial coordinates
| N: 66.89 |
|
S: 65.87 |
|
E: -18.86 |
|
W: -21.64 |
|
Min Depth: 46 M
Max Depth: 494 M
|
Data Set Citation
Dataset Creator:
Isla S. Castañeda
Dataset Title:
North Iceland Shelf Carbonate and Foraminiferal Oxygen Isotope Data
Dataset Series Name:
IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2004-048
Dataset Release Date:
8/2004
Dataset Release Place:
Boulder,CO
Dataset Publisher:
IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification:
2004-048
Online Resource:
ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/cas...
|
Paleo Temporal Coverage
Location Keywords
Science Keywords
ISO Topic Category
Project
Ancillary Keywords
Data Set Progress
Originating Center
Data Center
Distribution
Distribution Media:
ftp
Distribution Format:
text, excel
Fees:
none
|
Personnel
ISLA
S.
CASTANEDA
Role:
INVESTIGATOR
Contact Address:
Large Lakes Observatory
University of Minnesota
Province or State:
MN
Country:
USA
|
Related URL
Link:
GET DATA
Link:
GET DATA
Description:
Access to documentation and text data
|
Publications/References
Castañeda, I.S., L.M. Smith, G.B. Kristjánsdóttir, and J.T. Andrews. 2004.
Temporal changes in Holocene d18O records from the northwest and central North
Iceland Shelf. Journal of Quaternary Science, Volume 19, Issue 4, Pages 321 -
334. doi: 10.1002/jqs.841.
Creation and Review Dates
DIF Creation Date:
2006-11-03
Last DIF Revision Date:
2006-11-15
|
|
Links
