North GRIP Ice Core Last Glacial d15N and Temperature Reconstruction Kindler, P.; Guillevic, M.; Baumgartner, M.; Schwander, J.; Landais, A.; Leuenberger, M. Kindler, P. Guillevic, M. Baumgartner, M. Schwander, J. Landais, A. Leuenberger, M. earth science/paleoclimate/climate reconstructions|ice cores (temperature,delta 15N excess,null,degree Celsius,null,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar year before present,null,ice cores,null,null,N,GICC05 gas age; calendar years before 2k) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter per year,null,ice cores,null,null,N,tuned) earth science/paleoclimate/ice cores (age,null,null,calendar year before present,null,ice cores,null,null,N,calendar years before 2k) earth science/paleoclimate/climate reconstructions|ice cores (age,null,null,calendar year before present,null,climate reconstructions|ice cores,null,null,N,calendar years before 2k; ss09sea06bm) earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,ice cores,null,null,N,GICC05 ice age; calendar years before 2k) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,ice cores,null,null,N,ss09sea06bm ice age; calendar years before 2k) earth science/paleoclimate/climate reconstructions|ice cores (depth,null,null,meter,null,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 15N,bulk atmosphere,null,per mil AIR,null,ice cores,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/ice cores (gas age,null,null,calendar year before present,null,ice cores,null,null,N,ss09sea06bm gas age; calendar years before 2k) earth science/paleoclimate/climate reconstructions|ice cores (age,null,null,calendar year before present,null,climate reconstructions|ice cores,null,null,N,calendar years before 2k; GICC05) earth science/paleoclimate/ice cores (delta 15N,bulk atmosphere,unspecified margin of error,per mil AIR,null,ice cores,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (NGRIP>LATITUDE 75.1>LONGITUDE -42.33) In order to reconstruct the temperature of the North Greenland Ice Core Project (NGRIP) site, new measurements of d15N have been performed covering the time period from the beginning of the Holocene to Dansgaard-Oeschger (DO) event 8. Together with previously measured and mostly published d15N data, we present for the first time a NGRIP temperature reconstruction for the whole last glacial period from 10 to 120 kyr b2k (thousand years before 2000 AD) including every DO event based on d15N isotope measurements combined with a firn densification and heat diffusion model. The detected temperature rises at the onset of DO events range from 5 C (DO 25) up to 16.5 C (DO 11) with an uncertainty of +/- 3 C. To bring measured and modelled data into agreement, we had to reduce the accumulation rate given by the NGRIP ss09sea06bm timescale in some periods by 30 to 35%, especially during the last glacial maximum. A comparison between reconstructed temperature and d18Oice data confirms that the isotopic composition of the stadial was strongly influenced by seasonality. We evidence an anticorrelation between the variations of the d18Oice sensitivity to temperature (referred to as alpha) and obliquity in agreement with a simple Rayleigh distillation model. Finally, we suggest that alpha might be influenced by the Northern Hemisphere ice sheet volume. STUDY NOTES: North GRIP Ice Core Last Glacial (120-10 KYrBP) nitrogen isotope (d15N) data and temperature reconstruction NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kindler, P. Investigator : Guillevic, M. Investigator : Baumgartner, M. Investigator : Schwander, J. Investigator : Landais, A. Investigator : Leuenberger, M. 2018-06-08 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24371 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014temp.txt English https://www.ncdc.noaa.gov/paleo/study/24371 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014d15n.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2014temp.txt P. Kindler, M. Guillevic, M. Baumgartner, J. Schwander, A. Landais, M. Leuenberger2014Temperature reconstruction from 10 to 120 kyr b2k from the NGRIP ice coreClimate of the Past10887-90210.5194/cp-10-887-2014https://www.clim-past.net/10/887/2014/ START YEAR: 123001 cal yr BP * END YEAR: 9700 cal yr BP -42.33 75.1 -42.33 75.1