Communication à un colloque
Résumé : The Geostationary Interferometric Infrared Sounder (GIIRS) on board the FengYun-4 series ofsatellites is the world's first geostationary hyperspectral infrared sounder. With hyperspectralmeasurements collected from a geostationary orbit, it covers the carbon monoxide (CO) absorptionwindow around 2150 cm-1, the strong ammonia (NH3) absorption window at 955-975 cm-1, and theformic acid (HCOOH) absorption window around 1105 cm-1. GIIRS provides a unique opportunity totrack the wildfire emissions of CO, NH3, and HCOOH in Southeast Asia.Every spring, especially from March to April, strong emissions from forest fires are transportedacross the Southeast Asian region. The wildfires are caused by the agricultural practice of slash-and-burn, in which trees, shrubs or crop residues are cut down and dried after harvest and then burned toclear the land. The strong enhancement of CO, NH3 and HCOOH due to the wildfires in SoutheastAsia can be observed in the FY-4B/GIIRS retrievals. Long-range transport to the South China Seaand the Indian Ocean demonstrates the large impact of the wildfire emissions on the surroundingregions.In this study, the spatial and temporal variations of wildfire emissions of CO, NH3 and HCOOH fromSoutheast Asia in 2023 and 2024 are analysed using FY-4B/GIIRS retrievals and cross-comparedwith IASI retrievals. In addition, we compare the retrievals with GEOS-Chem model simulations tounderstand the ability of the model to capture the diurnal cycle of these emissions.

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