TEMPO Validation Capabilities Pandora NO 2 Total and tropospheric columns of NO2 from direct sun measurements -> column along a narrow cone (0.5 o ), actual.

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Presentation transcript:

TEMPO Validation Capabilities Pandora NO 2 Total and tropospheric columns of NO2 from direct sun measurements -> column along a narrow cone (0.5 o ), actual spatial coverage depends on solar azimuth and zenith angles for tropospheric and stratospheric column Tropospheric NO2 column from MAX-DOAS measurements -> averaged column along viewing horizontal direction (1-10 km), actual spatial coverage depends on aerosol loading conditions and viewing azimuth direction. Near surface concentration -> averaged concentrations along 1-10 km in horizontal direction and m in vertical direction; actual spatial coverage depends on aerosol loading conditions and viewing azimuth direction. Profile information is limited -> averaged profile along 1-10 km in horizontal direction and 1-2 km in vertical direction; actual spatial coverage depends on aerosol loading conditions and viewing azimuth direction. A narrow slice of the atmosphere.

Pandora TEMPO validation capabilities Three products will be available from the MAX-DOAS data: – Real time near surface concentrations – Total tropospheric columns – Profile information of NO 2, HCHO, O 3, SO 2, H 2 O Fast azimuthal scans can provide “areal” view with a diameter of 2-20 km Deploying multiple Pandoras at the same location will increase temporal resolution

Pandora Inversion Algorithms for MAX-DOAS interpretation Aerosols/clouds impact light path  retrieval of trace gases depends on “correct” aerosol/cloud representation ΔSCD: NO 2, HCHO, O 3, SO 2, H 2 O and O 2 O 2 Combination of different elevation angle measurements (1, 2, 15, 20, 30, 90 o )  Near surface concentrations, tropospheric total columns, some profile information Optimal estimation using on-line radiative transfer calculations (VLIDORT)  Aerosol Ext. Coef. Profile, SSA, ASY factor, Surface Albedo Trace gas profiles 2. Intensity fitting1. Real time

Pandora Validation PANDORA MAX-DOAS data need further validation (spatial averaging, trace gas spatial gradients, aerosol loading) DISCOVER-AQ demonstrated that the real situation is more complicated than expected. Not well represented by model studies More complex measurement strategies are needed to validate Pandora near surface NO 2 concentrations and profiles, especially during high emission periods with large temporal and special heterogeneity. Need to account for azimuthal inhomogeneity and different profile shapes

In-situ near the Pandora In-situ at surface, 1 km away from Pandora In-situ 3 km away from Pandora In-situ at 50 m In-situ at 100 m In-situ at 150 m In-situ at 200 m In-situ mobile Tethered Balloon at 400m NO2 Sonde instrument LP-DOAS and mobile: Up to 10 km travel along the view direction Pandora validation: better designed experiments are needed to understand and validate MAX-DOAS spatial coverage: - multiple in-situ measurements - long pass DOAS - mobile measurements

Near surface O 3 volume mixing ratios at Moody Tower (preliminary)