Law Dome d18O data 2100BP to 1996 as 4-year averages
Entry ID: ASAC_757_LD_d18O
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LD2.1ky-grid4y - Law Dome d18O data 2100BP (Present=2000AD) to 1996 as 4-year averages.|
Data set used in:
Jones, P.D. and M.E. Mann, Climate Over Past Millennia, Rev. Geo. 42(2), RG2002, doi:10.1029/2003RG000143,
Mann, M.E. and Jones, P.D. Global Surface Temperatures over the Past Two Millennia, GRL 30(15), 1820, doi: 10.1029/2003GL017814
Records for this site are in active development: check with email@example.com for information on updated or improved Law Dome isotope data sets.
Ages older than 700BP estimated from flow-model constrained by layer-thickness data (similar to Morgan et al., J. Glaciol, 43(143), 3-10, 1997).
Estimated error at 2ky BP on the order of a few decades.
Ages younger than 700BP from layer counting. Estimated error +/-1 year at 700BP scaling to absolute (zero error) from 193-0BP.
d18O values in permille. Approximate accuracy of individual measurements 0.1 permille, but each datum presented here is an integration of between 4 and 40 individual measurements, dependent upon age and sampling scheme.
For conversion to temperature, values of ~0.2-0.3 permille/degreeC are deduced from short-term comparisons. Longer term comparison of seasonal amplitude (van Ommen and Morgan, JGR, 102(D8), 1997) indicates conversion coefficient of 0.44 permille/degree C. Spatially derived conversion coefficients are on the order of 0.6-0.7 permille/degree C, but are unlikely to be appropriate.
Note on annual phasing:
A year for the purposes of averaging of the resolved-annual cycles, is by convention marked by the isotope maximum. Thus, calendar year 1994, for example, starts with the isotope peak in the Austral summer of 1993/1994 and concludes at the 1994/1995 peak. Studies show that on the average, the isotope peak occurs around January 10 (van Ommen and Morgan, JGR, 102(D8), 9351-9357, 1997).
This work was completed as part of ASAC/AAS project 757.
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This data set description is a member of a collection. The collection is described in|
|N: -66.7||S: -66.8||E: 112.9||W: 112.8||
|Start Date: 2010-04-08|
|Stop Date: 2010-04-08|
Paleo Start Date:
Paleo Stop Date: 1996
> Law Dome
GEOGRAPHIC REGION > POLAR
|ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE [Definition]|
|ATMOSPHERE >ATMOSPHERIC TEMPERATURE [Definition]|
|PALEOCLIMATE >ICE CORE RECORDS >ISOTOPES [Definition]|
|PALEOCLIMATE >PALEOCLIMATE RECONSTRUCTIONS >AIR TEMPERATURE RECONSTRUCTION [Definition]|
|ATMOSPHERE >ATMOSPHERIC CHEMISTRY >OXYGEN COMPOUNDS [Definition]|
ISO Topic Category
|FIELD SURVEYS [Information]|
|This is an older dataset that is actively being updated. It is therefore recommended that users contact the investigator before using these data to check if a more up-to-date version is available.|
|These data are publicly available for download from the provided URL.|
This data set conforms to the PICCCBY Attribution License|
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_757... when using these data.
Data Set Progress
Australian Antarctic Data Centre, Australia
Data Center URL: http://data.aad.gov.au
Distribution_Size: 4 kb
VAN OMMEN |
Role: TECHNICAL CONTACT
Phone: +61 3 6226 2981
Email: tas.van.ommen at utas.edu.au
Antarctic Climate and Ecosystems CRC
University of Tasmania
City: Sandy Bay
Province or State: Tasmania
Postal Code: 7005
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Australian Antarctic Division
203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Mann, M.E. and Jones, P.D. (2003), Global Surface Temperatures over the Past Two Millennia, Geophysical Research Letters, 30, 15, 1820, doi:doi: 10.1029/2003GL017814
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