Page Comparison

Abstract

Fire-emitted trace gases and aerosols such as SO₂, black carbon (BC), primary organic matter (POM), nitrate, and phosphorus play important role in influencing the climate system. These constituents can not only directly scatter or absorb incoming solar radiation but also indirectly alter cloud microphysical properties and nutrient availability of terrestrial and marine ecosystems. Fires affect the redistribution of phosphorus within and across biomes worldwide, influencing nutrient availability and net primary production. Here we explore the impacts of fire-associated trace gases and aerosol emissions including SO₂, BC and POM by integrating a global fire inventory (the Global Fire Emissions Database version 4s or GFED4s) into E3SM. We also generate fire-associated phosphorus emissions by synthesizing ecosystem studies that use a mass-balance approach to measure P loss during fire. Fires are estimated as a source of 0.91 Tg P yr^-1 to the global atmosphere. The majority of the fire-induced P flux deposits near the fire sources as super-coarse particles while about 4% of this flux (0.04 Tg P yr^-1), estimated with the P emission factors separately derived from remote aerosol measurements, is associated with long-range transport over spatial scales of hundreds to thousands of kilometers. Using the newly derived global fire-associated trace gas and aerosol emission maps coupled with the Energy Exascale Earth System Model (E3SM), the atmospheric fire-induced phosphorus budget and aerosol radiative effects are evaluated and assessed. Work is currently underway to optimize and couple fire emissions of phosphorus within ELM version 1 with the atmospheric model to enable interactive P redistribution in E3SM.

...