Physics – Geophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223708l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 23, CiteID L23708
Physics
Geophysics
8
Global Change: Climate Dynamics (0429, 3309), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Atmosphere (0315, 0325), Mathematical Geophysics: Persistence, Memory, Correlations, Clustering (3265, 7857), Atmospheric Processes: General Circulation (1223)
Scientific paper
A statistical analysis based on the fluctuation-dissipation theorem (FDT) is applied to estimate a model response to a small external forcing. An atmospheric GCM (the NCAR CCM3) coupled to an oceanic upper mixed layer is used to produce a long equilibrium run with 1 × CO2 concentration. Exploiting the FDT, we use the statistical properties of the internal variability of the system to approximately restore the linearized operator of the system. The modes of this operator are analyzed and compared with those calculated using the approach based on a perturbation method employed earlier by one of the authors. The sensitivity of the model to 2 × CO2 forcing calculated using the FDT approach compares well with the results obtained in an actual 2 × CO2 run.
Alexeev Vladimir A.
Langen Peter L.
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