Antarctic Sea Ice Variability in the Southern Ocean-Climate System Proceedings of a Workshop (2017) / Chapter Skim
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Appendix E: Invited Speaker Abstracts
Appendix E: Invited Speaker Abstracts
Pages 61-68
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From page 61... ...
Throughout this brief review, key gaps, challenges, and questions will be highlighted to stimulate discussion of strategies for improving assessments of Antarctic sea ice variability. Cecilia Bitz Understanding Antarctic climate change: How are we led and misled by models?
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From page 62... ...
Although widely used, sea ice extent alone is an incomplete/partial descriptor of sea ice state; also required is reliable information on sea ice and snowcover thickness and volume, with consideration of seasonality, different regional settings, and extreme events also being important factors. Nathan Kurtz Contribution of Antarctic sea ice thickness observations to understanding of sea ice volume change Observational data of Antarctic sea ice thickness have been compiled from a wide variety of sources including in situ measurements, undersea sonar, and laser and radar altimetry sources.
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From page 63... ...
One major challenge to understanding recent changes in Antarctic sea ice, and therefore to also improving predictions of future Antarctic sea ice trends under varying climate scenarios, is the extremely short period of direct observations, which are for the most part limited to the recent decades of the satellite era. And given the high spatial and temporal variability of Antarctic sea ice documented over recent decades, these direct observations may be insufficient to situate recent anomalies and trends into the proper temporal and climatological context.
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From page 64... ...
Nonetheless, despite the numerous challenges, ice core records are likely to remain one of the most promising avenues toward the reconstruction of past sea ice variability. Session 3: Sea Ice Variability in Earth System Models Clara Deser Modeling approaches to understanding observed Antarctic sea ice variability and trends I will provide an overview of the different types of modeling experiments that are used to understand Antarctic sea ice variability and trends and discuss their strengths and limitations.
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From page 65... ...
Using a hierarchy of climate models, we show that these jets reflect, guide, and focus the Rossby wave trains on western Antarctica, modifying the regional atmospheric circulation, and thus the Antarctic sea ice distribution. Further analyses show that the recently observed SST trends in different tropical ocean basins are linked with each other through atmospheric Rossby and Kelvin waves.
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From page 66... ...
So it is speculated here that subtle shifts in the ACC via changes in the westerlies may actually account for the statistical zonal sea ice expansion. David Ferreira The two–time scale response of Antarctic sea surface temperature and sea ice cover to ozone depletion In recent modeling work, we showed that the response of Antarctic sea surface temperature and sea ice cover to abrupt ozone depletion has two phases: a fast interannual (~1-5 y)
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From page 67... ...
Alex Haumann Dependence of Antarctic sea ice trends on zonally asymmetric atmospheric circulation changes and ocean stratification In this presentation, I will illustrate how zonal asymmetries in the large-scale circulation around Antarctica drive variations and long-term trends in Antarctic sea ice and argue that this process is not fully
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From page 68... ...
Paul Holland Seasonality of Antarctic sea ice trends The Antarctic sea ice increase features opposing regional trends with a strong seasonal signal. These spatial and temporal patterns can offer significant insight.
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