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- 1594995606 prefLabel "increasing biomass" assertion.
- 1612508552 prefLabel "trends in AOD" assertion.
- 1828268653 prefLabel "use of the Pangeo platform" assertion.
- 1911654666 prefLabel "aerosol particle emission" assertion.
- 559173760 prefLabel "South North America" assertion.
- 603978293 prefLabel "North Africa" assertion.
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- 74cd76d8-24f6-48a8-9fd6-db3ddab4e22f description "This study is made possible by the use of the Pangeo platform (Pangeo notebook), which is an open-source community for Big Data geosciences. We investigate regional trends in aerosol optical depth (AOD) from both satellite (MODIS) and ground-based (AERONET stations) measurements over land over the past 20 years. A good agreement is found between the two datasets when the spatial coverage of the stations is homogeneous. AOD increases significantly over northern North-America, India, Siberia and southern South America, while it decreases over Europe, Amazonia and southern North-America. In order to estimate the contribution of trends in biomass burning emissions to regional AOD trends, we use the burnt area of the monthly satellite product GFED4 as a proxy to calculate regional trends in biomass burning emissions for the period 2000-2015. Biomass burning emissions increase significantly over northern North America and East Asia, while they decrease over Europe, southern South America and northern Africa. We calculate the correlation between regional area burned and regional AOD to estimate regions where a significant trend in area burned can lead to a significant trend in AOD. We find that the increasing biomass burning emissions in northern North-America is likely to be the cause of the increase in AOD in this region. We also find that the significant increase in biomass burning emissions over East Asia cannot explain the negative observed trend in AOD. The reduction in anthropogenic aerosol particle emissions is probably the main driver of the AOD trend in this region. Finally, we construct a multivariate linear model to retrieve the global absolute change in AOD, using only the absolute change in regional burned area for the period 2000-2015. We show that the regional burned area is a good parameter for estimating the trend of AOD in most regions, since the covariation between biomass burning and AOD is strong due to their direct link and dependence to similar teleconnections." assertion.
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