Satellite-based view of the aerosol spatial and temporal variability in the Córdoba region (Argentina) using over ten years of high-resolution data.

摘要: Space-based observations offer a unique opportunity to investigate the atmosphere and its changes over decadal time scales, particularly in regions lacking situ and/or ground based observations. In this study, we temporal spatial variability of atmospheric particulate matter (aerosol) urban area Cordoba (central Argentina) using ten years (2003-2015) high-resolution (1 km) satellite-based retrievals aerosol optical depth (AOD). This fine resolution is achieved exploiting capabilities recently developed inversion algorithm (Multiangle implementation correction, MAIAC) applied MODIS sensor datasets NASA-Terra -Aqua platforms. Results investigation show clear seasonality AOD investigated area. found be shaped by an intricate superposition sources, acting different scales affecting region with yearly cycles. During late winter spring (August-October), local as well near- long-range transported biomass burning (BB) aerosols enhance load, levels reach their maximum values (> 0.35 at 0.47μm). The allowed disclose that, period, maxima are rural/agricultural around city, reaching up city boundaries pinpointing that fires near-range origin play major role enhancement. A reverse gradient from December March, showing AODs 40 80% higher than surroundings. fact, during summer, columnar load dominated (urban industrial) likely coupled secondary processes driven enhanced radiation mixing effects within deeper planetary boundary layer (PBL). With support modelled data Modern-Era Retrospective Analysis for Research Application (MERRA), further into chemical nature AOD. results suggest mineral dust also important component Cordoba, impact November February. use long-term dataset finally preliminary assessment trends region. For those months which sources were dominate (December March), positive trend outskirts, mainly areas urbanization/population growth decade. Conversely, negative (up -0.1 per decade) observed all rural BB season, being attributed decrease both continental scale.