Impact of organized intraseasonal convective perturbations on the tropical circulation

Details Impact of organized intraseasonal convective perturbations on the tropical circulation Impact of organized intraseasonal convective perturbations on the tropical circulation

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3616703b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 16, CiteID L16703

Physics

4

Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: General Circulation (1223)

Scientific paper

Using an atmospheric Global Circulation Model (GCM), we study the dynamical response of the tropical atmosphere to large-scale convective perturbations. We hypothesize that such perturbations can be triggered by intraseasonal SST anomalies. We thus compare two ensembles of simulations forced either with actual daily SST fields (high frequency, HF) or with low-pass filtered SST fields (T > 90 days; low frequency, LF). In HF simulations, there is a small increase of seasonal mean precipitation, but a strong and statistically significant increase of the low-level westerly flow. It is argued that it is mostly the “aggregation” of the convection into a few large-scale organized intraseasonal events, and not the intensification of the seasonal mean precipitation, that acts to intensify the low-level westerly flow in the HF simulations. This non-linear behavior shows that a correct representation of intraseasonal variability is required for a correct simulation of the average tropical circulation.

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