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Webinar: Heterogeneity of smoke from fires: evaluation of VIIRS smoke detection using FIREX-AQ eMAS data
Wednesday, 23 February 2022, 12:00
Wednesday, February 23, 2022. 12:00 PM. Webinar: Heterogeneity of smoke from fires: evaluation of VIIRS smoke detection using FIREX-AQ eMAS data. Pubu Ciren, NOAA. Sponsored by NOAA. More information here. Register here.
Abstract: The Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field campaign, jointly led by NASA and NOAA, which performed measurements of trace gas and aerosol emissions for wildfires and prescribed fires in detail, provided a unique opportunity for evaluating the Visible Infrared Imaging Radiometer Suite (VIIRS) aerosol detection product (ADP) and examining the limitations of smoke detection due to heterogeneity of smoke from fires. In this study, validation of the VIIRS ADP with observations from the FIREX-AQ field campaign is demonstrated using measurements from the Enhanced MODIS Airborne Simulator (eMAS), a multispectral scanner configured to approximate the Moderate-Resolution Imaging Spectrometer (MODIS). First, VIIRS ADP algorithm (IR-Visible path) is applied to eMAS observations. In general, eMAS ADP can detect very thick and moderately thick smoke plumes, but has difficulty for small scale, thin and dispersed (aged) smoke plumes. Secondly, VIIRS operational ADP product is evaluated using the matchup datasets between eMAS and VIIRS. It is indicated that, similar to eMAS ADP, the IR-Visible path in VIIRS ADP can detect very thick and moderately thick smoke plumes with a POCD (Probability of Correct Detection) of ~83%. However, significantly lower (~30%) for thin, diffused and small-scale smoke, due to effects from surface variability adding variability to the observed scene when smoke is thin or viewing angles are not ideal to generate a homogeneous scene. The Deep-Blue path in VIIRS ADP, however, performs well for both thick and thin smoke plumes, with a POCD of 91 and 75%, respectively. Finally, deep-dive analyses are carried out for cases where eMAS ADP poorly performed. It is found that the test based on the surface reflectance relationship between visible and shortwave-IR band may not be optimal for eMas observations.
Bio(s): Pubu Ciren earned his B.S. and the M.S. in applied meteorology from Nanjing Institute of Meteorology, China, and Ph.D. degree in atmospheric science from the University of Bergen, Norway. He currently is a research scientist with I.M. System Group Inc., in support of satellite aerosol detection algorithm development and validation for JPSS and GOES-R program at NOAA/NESDIS/STAR.