Coastal Erosion Variability at the Southern Laptev Sea Linked to Winter Sea Ice and the Arctic Oscillation

• Published in: Geophysical Research Letters
• Main Authors: Nielsen David Marcolino, Dobrynin Mikhail, Baehr Johanna, Razumov Sergey, Grigoriev Mikhail
• Format: Article in Journal/Newspaper
• Language: English
• Published: Zenodo 2020
• Subjects: Arctic coastal erosion; interannual variability; Laptev Sea; principal components; Arctic; Climate change; laptev; Sea ice
• Online Access: https://doi.org/10.1029/2019GL086876

Arctic coastal erosion experiences pronounced effects from ongoing climate change. The Laptev Sea figures among the Arctic regions with the most severe erosion rates. Here, we use unprecedentedly long records of almost 30 years of annual in-situ coastal erosion rate measurements from Bykovsky Peninsula and Muostakh Island to separate the main modes of variability, which we attribute to large-scale drivers. The first (lower-frequency) and second (higher-frequency) modes are associated with winter sea-ice cover in the Laptev Sea and with the Arctic Oscillation, respectively, which together account for 85 . 1 ± 24 . 1% of the total observed variance. Arctic coastal erosion has so far been neglected in Earth system models (ESMs). The proposed mechanisms set favorable conditions for coastal erosion at large scales (synoptic to planetary scales), compatible with those represented in modern ESMs. M. Grigoriev and S. Razumov were supported by the Russian Foundation for Basic Research (RFBR) Grants 18-05-70091 and 18-45-140057. The authors thank Lars Kutzbach, Victor Brovkin, and the Climate Modelling Group at Universität Hamburg for their support and the editor and the two reviewers for their valuable contributions. ERA-Interim data are available from ECMWF's website at www.ecmwf.int/en/forecasts/datasets. Coastal erosion data are available from PANGAEA at https://doi.org/10.1594/ PANGAEA.905519.