Climate variations in the Northern Hemisphere based on the use of an atmosphere-ocean IPCC model

Volodin, E. M. and Diansky, N. A. and Lanucara, P. and Purini, R. and Transerici, C. (2008) Climate variations in the Northern Hemisphere based on the use of an atmosphere-ocean IPCC model. Il nuovo cimento C, 31 (2). pp. 241-251. ISSN 1826-9885

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Forced and natural variability of modelled and observed Atlantic Ocean temperature and Atlantic Meridional Overturning Circulation (AMOC) is studied. In the observations and in a forced climate model run, we find increasing temperature at 1000m in the Atlantic (20N). SVD analysis shows that, for both model data and observations, a high index of North Atlantic Oscillation (NAO) corresponds to negative temperature anomaly at 1000m to the north of 55N, although geographical details of temperature anomaly distribution are different for the model and observations. Particular attention has been paid to the influence of the fresh water flux due to the present global warning on the slowing down of the AMOC. It is shown that fresh water flux change is only a secondary cause of reduced AMOC in global warming conditions, while heat flux change is probably the main reason. Finally, it is shown that internal model AMOC variability is positively correlated with the near-surface air temperature in Atlantic-European Arctic sector on a 10-year time scale.

Item Type: Article
Uncontrolled Keywords: Thermohaline convection ; Climate dynamics ; Global climate modeling
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551.6 Climatologia e tempo atmosferico (Classificare qui i lo studio dei Cambiamenti climatici)
Depositing User: Marina Spanti
Date Deposited: 23 Mar 2020 15:33
Last Modified: 23 Mar 2020 15:33

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