URBAN PM10 ESTIMATION BASED ON MERIS/AATSR SYNERGY DERIVED AOT AND MODIS LEVEL-2 ATMOSPHERIC PARAMETERS

摘要

In recent years, there has been a focus on urban air qualityrnstudies, aiming to improve the knowledge of thernenvironmental factors that affect population health andrnwell-being. Important urban air quality indicators arernboth PM10 and PM2.5. Recent scientific efforts havernconcentrated on PM mapping using Earth Observationrndata, offering better spatial coverage and resolutionrncompared to ground measurements [1], [2]. The mostrncommon approach of these studies has been the correlationrnof the in-situ measured near surface PM concentrationrnwith the satellite derived Aerosol Optical Thicknessrn(AOT), constraint by ancillary meteorological parametersrnto estimate the overall AOT contribution at the surfacernPM level. Although several studies have shownrnpromising results, a major drawback remains, regardingrnthe spatial resolution of the available satellite derivedrnAOT products, which reaches at best the 10 km × 10 kmrnin both MODIS and the GlobAEROSOL products cases.rnThis study aims at quantifying the surface PM10 concentrationrnover the broader urban area of Athens,rnGreece, using AOT spatial distributions derived by thernMERIS/AATSR synergy algorithm [3]. Using this algorithm,rnAOT can be derived at 1 km × 1 km spatial resolution.rnUsing 4 years of PM10 ground measurements, arnmultivariate regression technique was employed to estimaternPM10 as function of the MERIS/AATSR derivedrnAOT and some MODIS Level 2 atmospheric parametersrn(related to surface temperature and humidity, as well asrnto atmospheric static stability), at 5 km × 5 km spatialrnresolution. Our approach can be easily extended tornSentnel3 observations since they will be capable of extractingrninformation about all the above parameters.