The bimodality of the East Siberian fast ice extent: mechanisms and changes
Using operational sea-ice maps, we provide first insight into the seasonal evolution of fast ice in the East Siberian Sea for the period between 1999 and 2021. The fast ice season tends to start later by 4.7 d per decade and to end earlier by 9.7 d per decade. As a result, there is a trend towards a...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Cambridge University Press
|
| Series: | Annals of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0260305523000228/type/journal_article |
| _version_ | 1797831648404832256 |
|---|---|
| author | Valeria Selyuzhenok Thomas Krumpen Denis Demchev Rüdiger Gerdes Christian Haas |
| author_facet | Valeria Selyuzhenok Thomas Krumpen Denis Demchev Rüdiger Gerdes Christian Haas |
| author_sort | Valeria Selyuzhenok |
| collection | DOAJ |
| description | Using operational sea-ice maps, we provide first insight into the seasonal evolution of fast ice in the East Siberian Sea for the period between 1999 and 2021. The fast ice season tends to start later by 4.7 d per decade and to end earlier by 9.7 d per decade. As a result, there is a trend towards a shorter length of fast ice season by 2 weeks per decade. The analysis of air temperatures indicates that onset and end of the fast ice season are largely driven by thermodynamic processes. Two spatial modes (large, L-mode and small, S-mode) of East Siberian fast ice cover which have significant areal differences were distinguished. The occurrence of L- and S-modes was linked to the polarity of the Arctic Oscillation (AO) index. Negative AO phase leads to increased sea-ice convergence in the region, which in turn favours sea-ice grounding and promotes the development of large fast ice extent (L-mode). Lower deformation rates in the region during positive AO phase does not allow the formation of grounded features which results in small fast ice extent (S-mode). An analysis of sea-ice divergence confirms that L-mode seasons are characterised by higher on-shore convergence compared with S-mode seasons. |
| first_indexed | 2024-04-09T13:55:04Z |
| format | Article |
| id | doaj.art-d512a7db8b6749e9999dd2687ee265a9 |
| institution | Directory Open Access Journal |
| issn | 0260-3055 1727-5644 |
| language | English |
| last_indexed | 2024-04-09T13:55:04Z |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Annals of Glaciology |
| spelling | doaj.art-d512a7db8b6749e9999dd2687ee265a92023-05-08T09:05:15ZengCambridge University PressAnnals of Glaciology0260-30551727-56441710.1017/aog.2023.22The bimodality of the East Siberian fast ice extent: mechanisms and changesValeria Selyuzhenok0Thomas Krumpen1Denis Demchev2Rüdiger Gerdes3Christian Haas4N.N. Zubov State Oceanographic Institute, Roshydromet, Moscow, RussiaHelmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, GermanyDepartment of Space, Earth and Environment, Chalmers University of Technology, Gothenburg, SwedenHelmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, GermanyHelmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, GermanyUsing operational sea-ice maps, we provide first insight into the seasonal evolution of fast ice in the East Siberian Sea for the period between 1999 and 2021. The fast ice season tends to start later by 4.7 d per decade and to end earlier by 9.7 d per decade. As a result, there is a trend towards a shorter length of fast ice season by 2 weeks per decade. The analysis of air temperatures indicates that onset and end of the fast ice season are largely driven by thermodynamic processes. Two spatial modes (large, L-mode and small, S-mode) of East Siberian fast ice cover which have significant areal differences were distinguished. The occurrence of L- and S-modes was linked to the polarity of the Arctic Oscillation (AO) index. Negative AO phase leads to increased sea-ice convergence in the region, which in turn favours sea-ice grounding and promotes the development of large fast ice extent (L-mode). Lower deformation rates in the region during positive AO phase does not allow the formation of grounded features which results in small fast ice extent (S-mode). An analysis of sea-ice divergence confirms that L-mode seasons are characterised by higher on-shore convergence compared with S-mode seasons.https://www.cambridge.org/core/product/identifier/S0260305523000228/type/journal_articleSea icesea-ice dynamicssea-ice geophysics |
| spellingShingle | Valeria Selyuzhenok Thomas Krumpen Denis Demchev Rüdiger Gerdes Christian Haas The bimodality of the East Siberian fast ice extent: mechanisms and changes Annals of Glaciology Sea ice sea-ice dynamics sea-ice geophysics |
| title | The bimodality of the East Siberian fast ice extent: mechanisms and changes |
| title_full | The bimodality of the East Siberian fast ice extent: mechanisms and changes |
| title_fullStr | The bimodality of the East Siberian fast ice extent: mechanisms and changes |
| title_full_unstemmed | The bimodality of the East Siberian fast ice extent: mechanisms and changes |
| title_short | The bimodality of the East Siberian fast ice extent: mechanisms and changes |
| title_sort | bimodality of the east siberian fast ice extent mechanisms and changes |
| topic | Sea ice sea-ice dynamics sea-ice geophysics |
| url | https://www.cambridge.org/core/product/identifier/S0260305523000228/type/journal_article |
| work_keys_str_mv | AT valeriaselyuzhenok thebimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT thomaskrumpen thebimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT denisdemchev thebimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT rudigergerdes thebimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT christianhaas thebimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT valeriaselyuzhenok bimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT thomaskrumpen bimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT denisdemchev bimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT rudigergerdes bimodalityoftheeastsiberianfasticeextentmechanismsandchanges AT christianhaas bimodalityoftheeastsiberianfasticeextentmechanismsandchanges |