Inter-hemispheric Tropospheric Vertical Distribution of Ozone Over the Atlantic Ocean: Multi-year assessment from shipboard observations during the NOAA AEROSE II –AEROSE VII Campaigns
Despite the logistical and opportunistic limitations in obtaining ozonesonde records, we describe an unprecedented data set acquired from oceanographic intensive observation periods (IOP) conducted onboard the NOAA Ship Ronald H. Brown, during seven years (2006-2011) of the NOAA Aerosols and Ocean Science Expeditions (AEROSE). A composite of well-resolved and accurate tropospheric profiles retrieved from daily ozonesondes, launched along latitudes between 33N to 34 S; aim to describe the Atlantic Ocean ozone geographical and vertical distribution during boreal Spring and Summer months. Laminae obtained applying the Pierce-Teitelbaum (PT) method are coupled to gravity waves (GW) and Rossby waves (RW). The ozone records are complemented with other RAOB parameters, ECMWF and NOAA NCEP meteorological and backtrajectory re/analysis and a myriad of in-situ and remote-sensing measurements collected daily during every cruise. Furthermore, we highlight ozone distribution patterns as a result of stratospheric folding events from storms and cut-off lows systems, effect of precursors from biomass burning regions and transport from continental airmasses and polluted areas, interactions with regions of deep convection (e.g. ITZC), boundary layer dynamics, possible enhancement by mineral aerosols and others. Finally we strive to address the contribution from each of the aforementioned mechanisms to the total tropospheric ozone budget over the tropical Atlantic.