Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

• DOI: 10.3390/cli12020013
• Publication Date: 2024-01-23T12:22:32Z
• Authors: Augusto G. C. Per...; Rafael Palácios; Paula C. R. Santos; Raimundo Vitor S....; Glauber Cirino; Breno Imbiriba
• Keywords: Anomaly (physics); AERONET; Teleconnection; Multivariate ENSO index

The El Niño-Southern Oscillation (ENSO) stands out as the most significant tropical phenomenon in terms of climatic magnitude resulting from ocean–atmosphere interaction. Due to its atmospheric teleconnection mechanism, ENSO influences various environmental variables across distinct scales, potentially impacting spatiotemporal distribution aerosols. Within this context, study aims evaluate relationship between and aerosols entire Legal Amazon during period 2006 2011. Over five-year span, four events were identified. Concurrently, an analysis variability aerosol optical depth (AOD) Black Carbon radiation extinction (EAOD-BC) was conducted alongside these events, utilizing data derived Aerosol Robotic Network (AERONET), MERRA-2 model, ERSSTV5. Employing Windowed Cross-Correlation (WCC) approach, statistically phase lags up 4 6 months indicators observed. There approximate 100% increase AOD immediately after Niño periods, particularly intervals encompassing La Niña phase. specific humidity anomaly (QA) revealed that, contrary expectations, positive values observed throughout period. This result suggests that while there is a suppression precipitation due subsidence drier air masses Amazon, region still exhibits (Q) conditions. interaction intricate. However, Q can exert influence over microphysical properties aerosols, addition affecting their chemical composition load. primarily occurs through water absorption, leading substantial alterations scattering characteristics, thus solar radiation.