Severe Biomass-Burning Aerosol Pollution during the 2019 Amazon Wildfire and Its Direct Radiative-Forcing Impact: A Space Perspective from MODIS Retrievals

Yuan，Shuyun1,2; Bao，Fangwen2; Zhang，Xiaochuan2; Li，Ying2,3

2022-05-01

10.3390/rs14092080

Remote Sensing   影响因子和分区

2072-4292

An extreme biomass burning event occurred in the Amazonian rainforest from July through September 2019 due to the extensive wildfires used to clear the land, which allowed for more significant forest burning than previously occurred. In this study, we reclustered the clear-sky ambient aerosols to adapt the black carbon (BC) aerosol retrieval algorithm to Amazonia. This not only isolated the volumetric fraction of BC (f ) from moderate-resolution imaging spectroradiometer (MODIS) aerosol data, but also facilitated the use of aerosol mixing and scattering models to estimate the absorption properties of smoke plumes. The retrieved MODIS aerosol dataset provided a space perspective on characterizing the aerosol changes and trends of the 2019 pollution event. A very high aerosol optical depth (AOD) was found to affect the source areas continuously, with higher and thus stronger aerosol absorption. These pollutants also affected the atmosphere downwind due to the transport of air masses. In addition, properties of aerosols emitted from the 2019 Amazonian wildfire events visualized a significant year-to-year enhancement, with the averaged AOD at 550 nm increased by 150%. A 200% increase in the aerosol-absorption optical depth (AAOD) at 550 nm was recognized due to the low single-scattering albedo (SSA) caused by the explosive BC emissions during the pollution peak. Further simulations of aerosol radiative forcing (ARF) showed that the biomass-burning aerosols emitted during the extreme Amazonian wildfires event in 2019 forced a significant change in the radiative balance, which not only produced greater heating of the atmospheric column through strong absorption of BC, but also reduced the radiation reaching the top-of-atmosphere (TOA) and surface level. The negative radiative forcing at the TOA and surface level, as well as the positive radiative forcing in the atmosphere, were elevated by ~30% across the whole of South America compared to 2018. These radiative effects of the absorbing aerosol could have the ability to accelerate the deterioration cycle of drought and fire over the Amazonian rainforest.

aerosol optical properties Amazon wildfire black carbon direct radiative forcing satellite remote sensing

SCI ; EI

英语

通讯

National Natural Science Foundation of China[41575106];National Natural Science Foundation of China[41961160728];National Natural Science Foundation of China[42105124];

Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology

Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology

WOS:000799349900001

MDPI

20221912092690

Air pollution ; Atmospheric aerosols ; Atmospheric radiation ; Biomass ; Carbon ; Deterioration ; Fires ; Fog ; Radiometers ; Remote sensing ; Satellite imagery ; Smoke

Atmospheric Properties:443.1 ; Air Pollution:451 ; Satellites:655.2 ; Light/Optics:741.1 ; Chemical Products Generally:804 ; Fires and Fire Protection:914.2 ; Radiation Measuring Instruments:944.7 ; Materials Science:951

2-s2.0-85129683823

Scopus

1.School of Environment,Harbin Institute of Technology,Harbin,150059,China
2.Center for Oceanic and Atmospheric Science at SUSTech (COAST),Department of Ocean Sciences and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China

Yuan，Shuyun,Bao，Fangwen,Zhang，Xiaochuan,et al. Severe Biomass-Burning Aerosol Pollution during the 2019 Amazon Wildfire and Its Direct Radiative-Forcing Impact: A Space Perspective from MODIS Retrievals[J]. Remote Sensing,2022,14(9).

Yuan，Shuyun,Bao，Fangwen,Zhang，Xiaochuan,&Li，Ying.(2022).Severe Biomass-Burning Aerosol Pollution during the 2019 Amazon Wildfire and Its Direct Radiative-Forcing Impact: A Space Perspective from MODIS Retrievals.Remote Sensing,14(9).

Yuan，Shuyun,et al."Severe Biomass-Burning Aerosol Pollution during the 2019 Amazon Wildfire and Its Direct Radiative-Forcing Impact: A Space Perspective from MODIS Retrievals".Remote Sensing 14.9(2022).