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Inference of surface concentrations of nitrogen dioxide (NO2) in Colombia from tropospheric columns of the ozone measurement instrument (OMI)

2014; National Autonomous University of Mexico; Volume: 27; Issue: 2 Linguagem: Inglês

10.1016/s0187-6236(14)71110-5

2395-8812

John Freddy Grajales, Astrid Baquero‐Bernal,

Atmospheric and Environmental Gas Dynamics

con mediciones in situ corregidas y se encontraron coeficientes de correlación de hasta 0.91.Una fuente importante de NO 2 es la quema de biomasa, la cual puede ser diagnosticada a partir de los datos de potencia radiativa de los fuegos provenientes del reanálisis para el monitoreo de la composición atmosférica y el clima (MACC, por sus siglas en ingés).Se encontró una fuerte relación entre altas concentraciones de NO 2 inferidas y quema de biomasa para un área extensa que comprende los departamentos de Caquetá, Meta, Guaviare, Vichada y Putumayo. ABSTRACTFor the first time, maps of surface concentration of nitrogen dioxide (NO 2 ) are presented for the Colombian territory.NO 2 surface concentrations for the year 2007 are inferred based on two sources of tropospheric NO 2 column data: (1) a simulation using a three-dimensional global model (GEOS-Chem) and (2) measurements made by the ozone monitoring instrument (OMI) onboard the NASA Aura satellite.Results show monthly averages between 0.1 and 6 ppbv.We compare these inferred values to corrected ground measurements of NO 2 .We find correlation coefficients of up to 0.91 between the inferred data and the corrected observational data.A significant source of NO 2 is biomass burning, which can be diagnosed by data of fire radiative power (FRP) from the Monitoring of Atmospheric Composition and Climate (MACC) reanalysis.We find a close relationship between high values of inferred NO 2 surface concentrations and biomass burning for a large area which encompasses the departments of Caquetá, Meta, Guaviare, Vichada, and Putumayo.