Citation:

cp-3-485-2007

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Abstract:

The EPICA (European Project for Ice Coring in Antarctica) Dome C drilling in East Antarctica has now been completed to a depth of 3260 m, at only a few meters above bedrock. Here we present the new EDC3 chronology, which is based on the use of 1) a snow accumulation and mechanical flow model, and 2) a set of independent age markers along the core. These are obtained by pattern matching of recorded parameters to either absolutely dated paleoclimatic records, or to insolation variations. We show that this new time scale is in excellent agreement with the Dome Fuji and Vostok ice core time scales back to 100 kyr within 1 kyr. Discrepancies larger than 3 kyr arise during MIS 5.4, 5.5 and 6, which points to anomalies in either snow accumulation or mechanical flow during these time periods. We estimate that EDC3 gives accurate event durations within 20% (2 sigma) back to MIS11 and accurate absolute ages with a maximum uncertainty of 6 kyr back to 800 kyr.

Related to:

Loulergue, Laetitia; Parrenin, Frédéric; Blunier, Thomas; Barnola, Jean-Marc; Spahni, Renato; Schilt, Adrian; Raisbeck, Grant M; Chappellaz, Jérôme A (2007): New constraints on the gas age-ice age difference along the EPICA ice cores, 0-50 kyr. Climate of the Past, 3, 527-540, https://doi.org/10.5194/cp-3-527-2007

Project(s):

European Project for Ice Coring in Antarctica (EPICA)

Funding:

Fifth Framework Programme (FP5), grant/award no. EVK2-CT-2000-00077 : European Project for Ice Coring in Antarctica

Fourth Framework Programme (FP4), grant/award no. ENV4980702 : European Project for Ice Coring in Antarctica

Coverage:

Latitude: -75.100000 * Longitude: 123.350000

Date/Time Start: 1993-01-01T00:00:00 * Date/Time End: 2004-12-31T00:00:00

Minimum DEPTH, ice/snow: 0.00 m * Maximum DEPTH, ice/snow: 3189.45 m

Event(s):

EDC (EPICA Dome C) * Latitude: -75.100000 * Longitude: 123.350000 * Date/Time Start: 1993-01-01T00:00:00 * Date/Time End: 2004-12-31T00:00:00 * Elevation: 3233.0 m * Recovery: 3300 m * Location: Dome C, Antarctica * Campaign: * Method/Device: Ice drill (ICEDRILL) * Comment: Drill site is 56 km from the site of a previous Dome C core that provided records extending into the last glacial period, and 560 km from the site of the Vostok cores. The completion of the Dome C core was delayed when the first drilling became stuck at 788 m in 1999 (EDC96).

Comment:

Timescale EDC3 for the EPICA Dome C ice core, both for the ice matrix and gas bubbles. The dataset gives the depth versus age timescale that has been adopted as official for the EPICA Dome C ice core. Depth refers to the official log depth of the drilling. EDC3 for the ice matrix (EDC3_ice) is described fully in Parrenin et al. (Climate of the Past, 3, 485-497, 2007). This timescale is based on an snow accumulation / ice flow model, which is further tuned with independent age markers. Gas ages are derived using a firn densification model, and are fully described in Loulergue et al. (Climate of the Past, 3, 527-540, 2007). The ages given here correspond to the scenario 4 of Loulergue et al. and where necessary can be referred to as EDC3_gas_a.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, ice/snow	Depth ice/snow	m			Geocode
2	Sample ID	Sample ID		Parrenin, Frédéric		Bag number
3	Age model	Age model	ka	Parrenin, Frédéric	Age model, ice flow model	EDC3 time scale
4	Gas age	Gas age	ka BP	Parrenin, Frédéric	Age model, ice flow model	EDC3 time scale

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

17220 data points

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