Publication Date:
2023-03-07
Description:
Between 1999 and 2001, a 724 m long ice core was drilled on Akademii Nauk, the largest glacier on Severnaya Zemlya, Russian Arctic. The drilling site is located near the summit. The core is characterized by high melt-layer content. The melt layers are caused by melting and even by rain during the summer. We present high-resolution data of density, electrical conductivity (dielectrical profiling), stable water isotopes and melt-layer content for the upper 136 m (120 m w.e.) of the ice core. The dating by isotopic cycles and electrical conductivity peak identification suggests that this core section covers approximately the past 275 years. Singularities of volcanogenic and anthropogenic origin provide well-defined additional time markers. Long-term temperatures inferred from 12 year running mean averages of d18O reach their lowest level in the entire record around 1790. Thereafter the d18O values indicate a continuously increasing mean temperature on the Akademii Nauk ice cap until 1935, interrupted only by minor cooling episodes. The 20th century is found to be the warmest period in this record.
Keywords:
Age; AGE; Age model, layer counting; Akademii Nauk, Severnaya Zemlya, Russian Arctic; AWI_PerDyn; AWI Arctic Land Expedition; Calculated average/mean values; Calculated from density; Calculated moving averages; DEPTH, ice/snow; Depth water equivalent; ICEDRILL; Ice drill; Permafrost Research (Periglacial Dynamics) @ AWI; RU-Land_1999/2001_SevernayaZemly; SZ_1999/2001; SZ99; δ18O; δ18O, water
Type:
Dataset
Format:
text/tab-separated-values, 676 data points
