MAXDOAS horizontal (averaging) effects

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Presentation transcript:

MAXDOAS horizontal (averaging) effects MPI for Chemistry (MPIC), Mainz, Germany T. Wagner, J. Remmers, S. Beirle  4-azimuth MAX-DOAS measurements in Mainz  Characterisation of the information content using 3D RTM Master Thesis, Julia Remmers

Comparison of the Telescopes (5°) NO2 DSCDs

Gradient plots (1) Measurement for the horizontal variability Possibility to detect sources

Gradient plots (2) NO2 DSCDs N W E S

Gradient plots (3)

3D, spherical Monte Carlo RTM MCARTIM, Tim Deutschmann - 1D, 2D, 3D Box AMF Visualisation of a Monte-Carlo radiative transfer simulation (yellow: surface reflection, red: Rayleigh scattering, green: particle scattering)

Box AMF 0-1km, 500nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 1° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 1° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, aerosols 1-1km, OD 0.5 horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 1° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 1° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 2° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 5° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 10° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 8 km x 8km vertical grid: 100m 10 km SZA: 70° 5 km MAX-DOAS elevation: 30° 0 km -200 km 0 km 200 km

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km MAX-DOAS

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km MAX-DOAS

Box AMF 0-1km, 360nm, no aerosols horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km MAX-DOAS

Box AMF 0-1km, 500nm, no aerosols horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.1 horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.2 horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.3 horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.5 horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 1 horizontal grid: 2km x 2km 50 km 0 km -50 km elevation: 1° SCIA: 30 km x 60 km

Conclusions • Horizontal gradients can be determined from 4-azimuth MAX-DOAS observations => information on location of sources • 3D-distribution of the sensitivity of MAX-DOAS depends strongly on wavelength and aerosol load • horizontal area with box-AMF > 1 ranges typically from ~3 km to ~30 km • spatial resolution of future satellite instruments maches that of MAX-DOAS observations (or is even finer)

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