Spatial gradients of temperature, accumulation and δ<sup>18</sup>O-ice in Greenland over a series of Dansgaard-Oeschger events
Author:
Guillevic M.,Bazin L.,Landais A.,Kindler P.,Orsi A.,Masson-Delmotte V.,Blunier T.,Buchardt S. L.,Capron E.,Leuenberger M.,Martinerie P.,Prié F.,Vinther B. M.
Abstract
Abstract. Air and water stable isotope measurements from three Greenland deep ice cores (GISP2, NGRIP and NEEM) are investigated over a series of Dansgaard-Oeschger events (DO 8-9-10) which are representative of glacial millennial scale variability. Combined with firn modeling, air isotope data allow to quantify abrupt temperature increases for each drill site. Our data show that the magnitude of stadial-interstadial temperature increase is up to 3 °C larger in Central and North Greenland than in North West Greenland. The temporal water isotope (δ18O) – temperature relationship varies between 0.3 and 0.6 ± 0.08‰ °C−1 and is systematically larger at NEEM, possibly due to limited changes in precipitation seasonality compared to GISP2 or NGRIP. The gas age-ice age difference of warming events represented in water and air isotopes can only be modeled when assuming a 26% (NGRIP) to 34% (NEEM) lower accumulation than derived from a Dansgaard-Johnsen ice flow model.
Publisher
Copernicus GmbH
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