Quantifying the impacts of wildfires on soil thermal, hydrological and carbon dynamics in northern Eurasia from 2003 to 2016

<p>We use a process-based biogeochemistry model to simulate the fire impacts on soil physical regime and carbon budget of forest ecosystems in Northern Eurasia during 2003-2016 based on satellite-derived burn severity data. We find that fire severity generally increases in this region during the study period. Simulations indicate that fires increase soil temperature by 0.2-0.5 <sup>°</sup>C through removing the ground moss and surface soil organic matter, especially in Asian part of the region. Fires also increase water runoff by about 131 million m<sup>3</sup> yr<sup>-1</sup> through reducing post-fire evapotranspiration, leading to a higher regional river discharge. Fires remove 1.7 Pg C of ecosystem carbon through combustion emissions during this period, and reduce net ecosystem production from 106.4 to 66.1 Tg C yr<sup>-1</sup>.  Fires lead  the forest ecosystems lose 2.3 Pg C, shifting boreal forests from a carbon sink to a source in this period. Our study highlights the importance of wildfires in affecting soil thermal and hydrological and carbon dynamics in boreal forests.</p>