Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model
<p>Using a state-of-the-art coupled general circulation model, physical processes underlying Antarctic sea ice multidecadal variability and predictability are investigated. Our model simulations constrained by atmospheric reanalysis and observed sea surface temperature broadly capture a multid...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-12-01
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| Series: | The Cryosphere |
| Online Access: | https://tc.copernicus.org/articles/17/5219/2023/tc-17-5219-2023.pdf |
| _version_ | 1797400740523671552 |
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| author | Y. Morioka Y. Morioka Y. Morioka L. Zhang L. Zhang T. L. Delworth X. Yang F. Zeng M. Nonaka S. K. Behera |
| author_facet | Y. Morioka Y. Morioka Y. Morioka L. Zhang L. Zhang T. L. Delworth X. Yang F. Zeng M. Nonaka S. K. Behera |
| author_sort | Y. Morioka |
| collection | DOAJ |
| description | <p>Using a state-of-the-art coupled general circulation model, physical processes underlying Antarctic sea ice multidecadal variability and predictability are investigated. Our model simulations constrained by atmospheric reanalysis and observed sea surface temperature broadly capture a multidecadal variability in the observed sea ice extent (SIE) with a low sea ice state (late 1970s–1990s) and a high sea ice state (2000s–early 2010s), although the model overestimates the SIE decrease in the Weddell Sea around the 1980s. The low sea ice state is largely due to the deepening of the mixed layer and the associated deep convection that brings subsurface warm water to the surface. During the high sea ice period (post-2000s), the deep convection substantially weakens, so surface wind variability plays a greater role in the SIE variability. Decadal retrospective forecasts started from the above model simulations demonstrate that the Antarctic sea ice multidecadal variability can be skillfully predicted 6–10 years in advance, showing a moderate correlation with the observation. Ensemble members with a deeper mixed layer and stronger deep convection tend to predict a larger sea ice decrease in the 1980s, whereas members with a larger surface wind variability tend to predict a larger sea ice increase after the 2000s. Therefore, skillful simulation and prediction of the Antarctic sea ice multidecadal variability require accurate simulation and prediction of the mixed layer, deep convection, and surface wind variability in the model.</p> |
| first_indexed | 2024-03-09T01:59:55Z |
| format | Article |
| id | doaj.art-b14e2794ef82406a8362cc9217d6df72 |
| institution | Directory Open Access Journal |
| issn | 1994-0416 1994-0424 |
| language | English |
| last_indexed | 2024-03-09T01:59:55Z |
| publishDate | 2023-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj.art-b14e2794ef82406a8362cc9217d6df722023-12-08T07:42:10ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242023-12-01175219524010.5194/tc-17-5219-2023Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO modelY. Morioka0Y. Morioka1Y. Morioka2L. Zhang3L. Zhang4T. L. Delworth5X. Yang6F. Zeng7M. Nonaka8S. K. Behera9Application Laboratory, VAiG, JAMSTEC, Yokohama, Kanagawa, JapanGeophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USAAtmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey, USAGeophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USACooperative Programs for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, Colorado, USAGeophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USAGeophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USAGeophysical Fluid Dynamics Laboratory, NOAA, Princeton, New Jersey, USAApplication Laboratory, VAiG, JAMSTEC, Yokohama, Kanagawa, JapanApplication Laboratory, VAiG, JAMSTEC, Yokohama, Kanagawa, Japan<p>Using a state-of-the-art coupled general circulation model, physical processes underlying Antarctic sea ice multidecadal variability and predictability are investigated. Our model simulations constrained by atmospheric reanalysis and observed sea surface temperature broadly capture a multidecadal variability in the observed sea ice extent (SIE) with a low sea ice state (late 1970s–1990s) and a high sea ice state (2000s–early 2010s), although the model overestimates the SIE decrease in the Weddell Sea around the 1980s. The low sea ice state is largely due to the deepening of the mixed layer and the associated deep convection that brings subsurface warm water to the surface. During the high sea ice period (post-2000s), the deep convection substantially weakens, so surface wind variability plays a greater role in the SIE variability. Decadal retrospective forecasts started from the above model simulations demonstrate that the Antarctic sea ice multidecadal variability can be skillfully predicted 6–10 years in advance, showing a moderate correlation with the observation. Ensemble members with a deeper mixed layer and stronger deep convection tend to predict a larger sea ice decrease in the 1980s, whereas members with a larger surface wind variability tend to predict a larger sea ice increase after the 2000s. Therefore, skillful simulation and prediction of the Antarctic sea ice multidecadal variability require accurate simulation and prediction of the mixed layer, deep convection, and surface wind variability in the model.</p>https://tc.copernicus.org/articles/17/5219/2023/tc-17-5219-2023.pdf |
| spellingShingle | Y. Morioka Y. Morioka Y. Morioka L. Zhang L. Zhang T. L. Delworth X. Yang F. Zeng M. Nonaka S. K. Behera Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model The Cryosphere |
| title | Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model |
| title_full | Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model |
| title_fullStr | Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model |
| title_full_unstemmed | Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model |
| title_short | Multidecadal variability and predictability of Antarctic sea ice in the GFDL SPEAR_LO model |
| title_sort | multidecadal variability and predictability of antarctic sea ice in the gfdl spear lo model |
| url | https://tc.copernicus.org/articles/17/5219/2023/tc-17-5219-2023.pdf |
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