How weather events modify aerosol particle size distributions in the Amazon boundary layer

Abstract. This study evaluates the effect of weather events on aerosol particle size distribution (PSD) at Amazon Tall Tower Observatory (ATTO). research combines in situ measurements PSD and remote sensing data lightning density, brightness temperature, cloud top height, liquid water, rain rate vertical velocity. Measurements were obtained by scanning mobility sizers (SMPSs), new generation GOES satellites (GOES-16), SIPAM S-band radar LAP 3000 wind profiler recently installed ATTO-Campina site. The combined allow exploring changes due to different meteorological processes. average diurnal cycle shows a higher abundance ultrafine particles (NUFP) early morning, which is coupled with relatively lower concentrations Aitken (NAIT) accumulation (NACC) mode particles. From morning middle afternoon, an inverse behavior observed, where NUFP decreases NAIT NACC increase, reflecting typical growth process. Composite figures show increase before, during after was detected satellite above ATTO. These findings strongly indicate close relationship between transport deep convective clouds. Lightning density connected large NUFP, beginning approximately 100 min before maximum reaching peak values around 200 later. In addition, removal found. Both decrease appear parallel increasing intensity activity. increases exponentially thunderstorm intensity. contrast, behavior, decreasing from activity minimum time water same but patterns seasons. processes do not occur continually are probably modulated gravity waves range 1 5 h, creating complex mechanism interaction succession updrafts downdrafts, clouds, clear-sky situations. measured profiles that downdrafts mainly located below 10 km, while aircraft observations ACRIDICON–CHUVA campaign had shown km. Our opens scientific questions be evaluated order understand intricate physical chemical mechanisms involved production Amazonia.