Publication Abstracts

Nazarenko et al. 2006

Nazarenko, L., N. Tausnev, and J. Hansen, 2006: Sea-ice and North Atlantic climate response to CO2-induced warming and cooling conditions. J. Glaciol., 52, 433-439.

Using a global climate model coupled with an ocean and a sea-ice model, we compare the effects of doubling CO2 and halving CO2 on sea-ice cover and connections with the atmosphere and ocean. An overall warming in the 2×CO2 experiment causes reduction of sea-ice extent by 15%, with maximum decrease in summer and autumn, consistent with observed seasonal sea-ice changes. The intensification of the Northern Hemisphere circulation is reflected in the positive phase of the Arctic Oscillation (AO), associated with higher-than-normal surface pressure south of about 508 N and lower- than-normal surface pressure over the high northern latitudes. Strengthening the polar cell causes enhancement of westerlies around the Arctic perimeter during winter. Cooling, in the 0.5×CO2 experiment, leads to thicker and more extensive sea ice. In the Southern Hemisphere, the increase in ice-covered area (28%) dominates the ice-thickness increase (5%) due to open ocean to the north. In the Northern Hemisphere, sea-ice cover increases by only 8% due to the enclosed land/sea configuration, but sea ice becomes much thicker (108%). Substantial weakening of the polar cell due to increase in sea-level pressure over polar latitudes leads to a negative trend of the winter AO index. The model reproduces large year-to-year variability under both cooling and warming conditions.

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BibTeX Citation

@article{na04100j,
  author={Nazarenko, L. and Tausnev, N. and Hansen, J.},
  title={Sea-ice and North Atlantic climate response to CO2-induced warming and cooling conditions},
  year={2006},
  journal={J. Glaciol.},
  volume={52},
  pages={433--439},
}

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RIS Citation

TY  - JOUR
ID  - na04100j
AU  - Nazarenko, L.
AU  - Tausnev, N.
AU  - Hansen, J.
PY  - 2006
TI  - Sea-ice and North Atlantic climate response to CO2-induced warming and cooling conditions
JA  - J. Glaciol.
VL  - 52
SP  - 433
EP  - 439
ER  -

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