Impact of biomass burning aerosol on the monsoon circulation transition over Amazonia

Details Impact of biomass burning aerosol on the monsoon circulation transition over Amazonia Impact of biomass burning aerosol on the monsoon circulation transition over Amazonia

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3610814z&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 10, CiteID L10814

Physics

3

Atmospheric Processes: Regional Modeling, Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: General Circulation (1223)

Scientific paper

Ensemble simulations of a regional climate model (RegCM3) forced by aerosol radiative forcing suggest that biomass burning aerosols can work against the seasonal monsoon circulation transition, thus re-enforce the dry season rainfall pattern for Southern Amazonia. Strongly absorbing smoke aerosols warm and stabilize the lower troposphere within the smoke center in southern Amazonia (where aerosol optical depth >0.3). These changes increase the surface pressure in the smoke center, weaken the southward surface pressure gradient between northern and southern Amazonia, and consequently induce an anomalous moisture divergence in the smoke center and an anomalous convergence in northwestern Amazonia (5°S-5°N, 60°W-70°W). The increased atmospheric thermodynamic stability, surface pressure, and divergent flow in Southern Amazonia may inhibit synoptic cyclonic activities propagated from extratropical South America, and re-enforce winter-like synoptic cyclonic activities and rainfall in southeastern Brazil, Paraguay and northeastern Argentina.

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