Aerosol products from Himawari8 Ian Grant Australian Bureau

Aerosol products from Himawari-8 Ian Grant, Australian Bureau of Meteorology

CSIRO Dual-View Algorithm Developed by Qin Yi (CSIRO) Aerosol optical depth from Himawari-8/AHI + MODIS or Himawari-8/AHI + NPP/VIIRS

CSIRO Dual-View Algorithm AHI-MODIS/VIIRS Aerosol and Surface BRDF Retrieval • Originally developed for the dual-view AATSR • Three key components: • Surface BRDF modelling based on the assumption that the BRDF shape is stable over longer period of time; • Aerosol classification providing representative aerosol types; • Radiative transfer modelling providing direct link between surface BRDF and top of atmosphere (TOA) reflectance. Qin, Y. ; Mitchell, R. ; Forgan, B. W. , "Characterizing the Aerosol and Surface Reflectance Over Australia Using AATSR, " Geoscience and Remote Sensing, IEEE Transactions on , vol. PP, no. 99, pp. 1, 20; doi: 10. 1109/TGRS. 2015. 2433911 Qin, Y. and R. M. Mitchell, "Characterisation of episodic aerosol types over the Australian continent, " Atmospheric Chemistry and Physics, vol. 9, pp. 19431956, 2009.

CSIRO Dual-View Algorithm Prerequisite is cross-calibration between AHI and MODIS/VIIRS • Spectral Bands Conversion • Radiometric Calibration Work is being extended to AHI + GCOM-C/SGLI • CSIRO/JAXA collaboration

MAIAC Algorithm Multi. Angle Implementation of Atmospheric Correction • Developed by Alexei Lyapustin (NASA) • Simultaneously retrieves • Aerosol Optical Thickness and Type • Surface Reflectance, Cloud mask • Builds on earlier methods for MODIS, MISR, etc. • Better coverage over bright land surfaces (desert) • Less biased over urban surfaces • Applied to MODIS, VIIRS, DSCOVR/EPIC, GOES-R • Adapted to Himawari-8 – Initial demonstration looks good • ABo. M/NASA collaboration to apply to Himawari-8 at Bo. M being pursued

MAIAC Algorithm: Aerosol Optical Depth Dense Dark Vegetation algorithm (VIIRS) Biomass Burning in South America (MODIS - Day of year, 2003) MAIAC (MODIS) 242 244

MAIAC adapted to Himawari-8/AHI MAIAC processing of Himawari-8 AHI data on day 93, 2016 over 250 km area centered on Canberra. Shown are retrievals from mid-morning till mid-evening. The four columns show 1) TOA RGB from AHI 2) MAIAC cloud mask (Blue-clear-land; light Blue – clear-water; Red/Yellow – cloud) 3) aerosol optical depth at 0. 47 m 4) atmospherically corrected RGB surface reflectance The yellow circle indicates a starting smoke plume, which remains stable despite nearby cloud and the background surface reflectance changing with sun angle.

AOD validation data from Australian sunphotomter networks ABo. M CSIRO