Publication Abstracts

Roach et al. 2022

Roach, L.A., I. Eisenman, T.J. Wagner, E. Blanchard-Wrigglesworth, and C.M. Bitz, 2022: Asymmetry in the seasonal cycle of Antarctic sea ice due to insolation. Nat. Geosci., 15, no. 4, 277-281, doi:10.1038/s41561-022-00913-6.

The mean seasonal cycle of Antarctic sea-ice extent is asymmetric, with the period of ice retreat being approximately two months shorter than the period of ice advance. This feature is largely consistent in observations from year to year and across different satellite products. The asymmetry is also broadly reproduced by comprehensive climate models across generations from CMIP3 to CMIP6, with limited impacts from internal variability. Using a range of idealized climate models of varying complexity, we show that the seasonal cycle in top-of-atmosphere incident solar radiation drives the asymmetry. Because insolation in southern high latitudes departs from a sinusoid by having a narrow peak of intense brightness in summer and a long period of low light in winter, there is rapid summer ice retreat and gradual winter ice advance. This simple physical explanation is markedly different from those proposed in previous studies.

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BibTeX Citation

  author={Roach, L. A. and Eisenman, I. and Wagner, T. J. and Blanchard-Wrigglesworth, E. and Bitz, C. M.},
  title={Asymmetry in the seasonal cycle of Antarctic sea ice due to insolation},
  journal={Nat. Geosci.},

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RIS Citation

ID  - ro07710v
AU  - Roach, L. A.
AU  - Eisenman, I.
AU  - Wagner, T. J.
AU  - Blanchard-Wrigglesworth, E.
AU  - Bitz, C. M.
PY  - 2022
TI  - Asymmetry in the seasonal cycle of Antarctic sea ice due to insolation
JA  - Nat. Geosci.
VL  - 15
IS  - 4
SP  - 277
EP  - 281
DO  - 10.1038/s41561-022-00913-6
ER  -

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