Regional atmospheric response to tropical Pacific SST perturbations

An extended domain limited area model was implemented for seasonal‐range simulations to assess the effect of tropical Pacific SST perturbations on weather patterns over Europe and Mediterranean. The experimental method consisted of Skiron/Eta model integrations with coarse and fine grid increment us...

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Bibliographic Details
Published in:Geophysical research letters 2005-02, Vol.32 (4), p.L04806.1-n/a
Main Authors: Katsafados, P., Papadopoulos, A., Kallos, G.
Format: Article
Language:English
Subjects:
Atmospherics
Circulation
Climatology
Computer simulation
Damping
Earth sciences
Earth, ocean, space
Exact sciences and technology
Marine
Perturbation methods
Regional
Weather
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Summary:An extended domain limited area model was implemented for seasonal‐range simulations to assess the effect of tropical Pacific SST perturbations on weather patterns over Europe and Mediterranean. The experimental method consisted of Skiron/Eta model integrations with coarse and fine grid increment using artificially‐modified as well as analysis SST forcing. The selected period was August–October 1997. Model simulations with coarse grid increment produced a weak signal in the precipitation pattern and the synoptic scale circulation over Europe, implying a damping of the North Atlantic atmospheric response to the tropical Pacific SST perturbation. Fine resolution experiments suggested an amplified dynamic response providing a direct link between tropical Pacific SST and North Atlantic synoptic circulation. The output signal is mainly attributed to the effective representation of the regional/mesoscale atmospheric features due to the model implementation with a fine mesh grid.
ISSN:0094-8276
1944-8007
DOI:10.1029/2004GL021828