Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma
Abstract The recent sea ice changes in the Northern Hemisphere (NH), necessitate elucidating the sea ice variability over the past 2.6 million years (Ma), when the Earth’s glacial cycles transitioned from ∼41 to ∼100 kyr periodicity, following the Mid-Pleistocene Transition (MPT) period (0.7–1.2 Ma)...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55327-2 |
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| author | Gagan Mandal Soon-Il An Jae-Heung Park Kyung-Sook Yun Chao Liu Seungmok Paik |
| author_facet | Gagan Mandal Soon-Il An Jae-Heung Park Kyung-Sook Yun Chao Liu Seungmok Paik |
| author_sort | Gagan Mandal |
| collection | DOAJ |
| description | Abstract The recent sea ice changes in the Northern Hemisphere (NH), necessitate elucidating the sea ice variability over the past 2.6 million years (Ma), when the Earth’s glacial cycles transitioned from ∼41 to ∼100 kyr periodicity, following the Mid-Pleistocene Transition (MPT) period (0.7–1.2 Ma). Here, we analyze a coupled general circulation model (CGCM) simulation to understand how the NH sea ice responds to changes in the transient orbital, greenhouse gas (GHG), and ice-sheet forcings. We find that the Earth’s axial tilt (obliquity) and axial wobble (precession) strongly influence the variability in high-latitude (>70° N) perennial sea ice and mid-latitude (35° N–70° N) seasonal sea ice, respectively, by modifying the net surface shortwave radiation. Meanwhile, the GHG forcing affects the glacial–interglacial sea ice predominantly in the Labrador Sea, Irminger–Iceland basin sector, and Central North Pacific regions during the MPT and post-MPT (0.0–0.7 Ma) periods by modulating the downwelling longwave radiation. Additionally, we confirm that variability with longer periodicity (∼100 kyr) from GHG and ice-sheet forcings is most pronounced in NH sea ice during the MPT and post-MPT periods. |
| format | Article |
| id | doaj-art-d8ed1d6610b247a9b000604851278454 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-d8ed1d6610b247a9b0006048512784542025-01-05T12:41:07ZengNature PortfolioNature Communications2041-17232025-01-0116111410.1038/s41467-024-55327-2Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 MaGagan Mandal0Soon-Il An1Jae-Heung Park2Kyung-Sook Yun3Chao Liu4Seungmok Paik5Irreversible Climate Change Research Center, Yonsei UniversityIrreversible Climate Change Research Center, Yonsei UniversitySchool of Earth and Environmental Sciences, Seoul National UniversityCenter for Climate Physics, Institute for Basic Science (IBS)Irreversible Climate Change Research Center, Yonsei UniversityIrreversible Climate Change Research Center, Yonsei UniversityAbstract The recent sea ice changes in the Northern Hemisphere (NH), necessitate elucidating the sea ice variability over the past 2.6 million years (Ma), when the Earth’s glacial cycles transitioned from ∼41 to ∼100 kyr periodicity, following the Mid-Pleistocene Transition (MPT) period (0.7–1.2 Ma). Here, we analyze a coupled general circulation model (CGCM) simulation to understand how the NH sea ice responds to changes in the transient orbital, greenhouse gas (GHG), and ice-sheet forcings. We find that the Earth’s axial tilt (obliquity) and axial wobble (precession) strongly influence the variability in high-latitude (>70° N) perennial sea ice and mid-latitude (35° N–70° N) seasonal sea ice, respectively, by modifying the net surface shortwave radiation. Meanwhile, the GHG forcing affects the glacial–interglacial sea ice predominantly in the Labrador Sea, Irminger–Iceland basin sector, and Central North Pacific regions during the MPT and post-MPT (0.0–0.7 Ma) periods by modulating the downwelling longwave radiation. Additionally, we confirm that variability with longer periodicity (∼100 kyr) from GHG and ice-sheet forcings is most pronounced in NH sea ice during the MPT and post-MPT periods.https://doi.org/10.1038/s41467-024-55327-2 |
| spellingShingle | Gagan Mandal Soon-Il An Jae-Heung Park Kyung-Sook Yun Chao Liu Seungmok Paik Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma Nature Communications |
| title | Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma |
| title_full | Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma |
| title_fullStr | Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma |
| title_full_unstemmed | Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma |
| title_short | Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma |
| title_sort | northern hemisphere sea ice variability in a transient cgcm simulation of the past 2 6 ma |
| url | https://doi.org/10.1038/s41467-024-55327-2 |
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