Sensitivity of modelled atmospheric circulation to the representation of stable boundary layer processes

Details Sensitivity of modelled atmospheric circulation to the representation of stable boundary layer processes Sensitivity of modelled atmospheric circulation to the representation of stable boundary layer processes

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406708k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 6, CiteID L06708

Physics

2

Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

We examine the sensitivity of the modelled climate of the third generation Hadley Centre climate model to changes in the parametrization of surface and boundary-layer fluxes under stable stratification. Replacing the model's standard parametrization with one in which fluxes decrease more rapidly with increasing stability generates statistically-significant changes in modelled 500 hPa height. The largest changes are seen across the North Atlantic and North Pacific and occur during Northern Hemisphere summer, when persistent stable atmospheric boundary layers form over the western sides of these oceans. The atmospheric response in a coupled version of the model is stronger than in the atmosphere-only version, suggesting that feedbacks involving sea surface temperatures, surface fluxes and atmospheric circulation are important in determining the response.

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