www DLR de Chart 1 Satellite remote sensing

www. DLR. de • Chart 1 Satellite remote sensing of volcanic ash Margarita Vázquez, Dennis Piontek, Daniel Sauer, Johan Strandgren (K. Graf)

www. DLR. de • Chart 2 MSG/SEVIRI IR: day and night retrieval

www. DLR. de • Chart 3 HIMAWARI/AHI IR: day and night retrieval

www. DLR. de • Chart 4 Radiative transfer simulations: rtsim Optical properties of aerosols, clouds… Particle form, type, mineral mixture, location, height, vertical extent, concentration… Earth/Sun parameters Training dataset for a neural network Simulated SEVIRI and AHI IR bands

www. DLR. de • Chart 5 SEVIRI_VADUGS (today) Outputs: Ash cloud top height column concentration + Cirrus mask to exclude cirrus covered pixels

www. DLR. de • Chart 6 SEVIRI_VADUGS – Aircraft measurements Eyjafjalla. measurement flights: Schumann et al. , 2011

www. DLR. de • Chart 7 SEVIRI_VADUGS – Human expert analysis

www. DLR. de • Chart 8 SEVIRI_VADUGS (Puyehue eruption movie)

www. DLR. de • Chart 9 AHI_VADUGS (experimental) BT 6. 2 BT 6. 9 BT 7. 3 BT 8. 6 BT 9. 6 BT 10. 4 BT 11. 2 BT 12. 4 BT 13. 3 VZA Outputs: Ash cloud top height column concentration AHI_VADUGS: TWO hidden layers à 16 neurons SEVIRI_VADUGS: ONE hidden layers à 600 neurons

www. DLR. de • Chart 10 AHI_VADUGS Sinabung eruption - Input: AHI IR BT - Ash detection through BTD threshold - Simultaneous retrieval of ash cloud top height (m) and column concentration (kg/m 2) TD 11 -12 TD < 0. 5 (flag) CTH Column Conc.

www. DLR. de • Chart 11 mass / g m-2 CTH / km SEVIRI_VADUGS -- Eyjafjallajökull Eyja

www. DLR. de • Chart 12 mass / g m-2 CTH / km SEVIRI_VADUGS -- Grimsvötn

www. DLR. de • Chart 13 mass / g m-2 CTH / km SEVIRI_VADUGS -- Puyehue

www. DLR. de • Chart 14 AHI_VADUGS -- Rinjani

www. DLR. de • Chart 15 AHI_VADUGS does not have a detection flag (yet)

www. DLR. de • Chart 16 Lessons learned - Outlook - Improve network architecture - Dedicated flags better than joint output - Seek causes of overestimation or height (aviation hazard) - Revisit definition of height - Create detection flag - Review of the optical properties of ash mixtures - Cirrus mask not altered by underlying aerosol layer - Problem of misdetection/dust -> catalogue of volcanoes + implementation of feature tracking

www. DLR. de • Chart 17