Pakitsoq Greenland Ice Outcrop Gas Stratigraphy Data 2004-2005 Schaefer, H.; Petrenko, V.V.; Brook, E.J.; Severinghaus, J.; Reeh, N.; Melton, J.R.; Mitchell, L.E. Schaefer, H. Petrenko, V.V. Brook, E.J. Severinghaus, J. Reeh, N. Melton, J.R. Mitchell, L.E. earth science/paleoclimate/ice cores (delta 15N,nitrogen gas,null,per mil AIR,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 18O,oxygen gas,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,note: distance) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,one standard deviation,parts per billion,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (air content,bulk ice,null,milliliter per gram,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar kiloyear before present,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per billion,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Pakitsoq outcrop>LATITUDE 69.48>LONGITUDE -50.8) Horizontal ice-core sites, where ancient ice is exposed at the glacier surface, offer unique opportunities for paleo-studies of trace components requiring large sample volumes. Following previous work at the Pâkitsoq ice margin in West Greenland, we use a combination of geochemical parameters measured in the ice matrix (d18Oice) and air occlusions (d18Oatm, d15N of N2 and methane concentration) to date ice layers from specific climatic intervals. The data presented here expand our understanding of the stratigraphy and three-dimensional structure of ice layers outcropping at Pâkitsoq. Sections containing ice from every distinct climatic interval during Termination I, including Last Glacial Maximum, Bølling/Allerød, Younger Dryas and the early Holocene, are identified. In the early Holocene, we find evidence for climatic fluctuations similar to signals found in deep ice cores from Greenland. A second glacial-interglacial transition exposed at the extreme margin of the ice is identified as another outcrop of Termination I (rather than the onset of the Eemian interglacial as postulated in earlier work). Consequently, the main structural feature at Pâkitsoq is a large-scale anticline with accordion-type folding in both exposed sequences of the glacial-Holocene transition, leading to multiple layer duplications and age reversals. STUDY NOTES: All data are from ice samples collected in the 2004 and 2005 field seasons at the ancient ice outcrop of Pakitsoq (West Greenland) and supplement earlier work on this site (2001-2003; Petrenko et al., 2006). Data are from a network of sampling profiles whose details and exact positions are provided in Table 2 and Figure 3 of Schaefer et al. (2009). Measured data include air content, CH4 concentration [CH4], the 15N/14N ratio of N2 (d15N), the 18O/16O ratio of atmospheric O2 (d18Oatm) and of the ice matrix (d18Oice). Sample age is a function of distance along the sampling profile and may be reversed as a consequence of folding. Ages are reported only for shorter profiles where the parameters provided sufficient age control. Gas ages are derived by comparison with equivalent records from the Greenland Ice Sheet Project 2 core and placed on the gas age scale of Schaefer et al. (2006). Precision is given as pooled standard deviations derived from triplicate measurements on each of 1-3 replicate samples per depth for [CH4] and as pooled standard deviations derived from duplicate analyses for d15N and d18O. Pooled standard deviations for 2004 are: [CH4]: 32 ppb (n=74). d15N: 0.009 ‰ (n= 51) d18O: 0.024 ‰ (n= 51) Pooled standard deviations for 2005 are: [CH4]: 22 ppb (n=174). d15N: 0.009 ‰ (n= 76) (all short profiles); 0.006 ‰ (n= 50) (PK05 EH). d18O: 0.024 ‰ (n= 76) (all short profiles); 0.027‰ (n= 50) (PK05 EH). No d15N and d18O duplicates were measured for the following profiles: PK04 BAS, PK04 BAN, PK05 MA. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Schaefer, H. Investigator : Petrenko, V.V. Investigator : Brook, E.J. Investigator : Severinghaus, J. Investigator : Reeh, N. Investigator : Melton, J.R. Investigator : Mitchell, L.E. 2010-09-10 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9904 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.txt English https://www.ncdc.noaa.gov/paleo/study/9904 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/pakitsoq2009.txt Schaefer, H., V.V. Petrenko, E.J. Brook, J.P. Severinghaus, N. Reeh, J.R. Melton, and L. Mitchell. 2009. Ice stratigraphy at the Pâkitsoq ice margin, West Greenland, derived from gas records. Journal of Glaciology, Vol. 55, No. 191, pp. 411-421(11), June 2009. DOI: 10.3189/002214309788816704 START YEAR: 24000 cal yr BP * END YEAR: 11000 cal yr BP -50.8 69.48 -50.8 69.48