Variability in Biomass Burning Emissions Weakens Aerosol Forcing Due To Nonlinear Aerosol-Cloud Interactions
| dc.contributor.author | Heyblom, Kyle B. | |
| dc.contributor.author | Singh, Hansi A. | |
| dc.contributor.author | Rasch, Philip J. | |
| dc.contributor.author | Hirasawa, Haruki | |
| dc.date.accessioned | 2023-06-12T03:57:02Z | |
| dc.date.available | 2023-06-12T03:57:02Z | |
| dc.date.copyright | 2023 | en_US |
| dc.date.issued | 2023-06-02 | |
| dc.description.abstract | The magnitude of the aerosol forcing remains among the largest unknowns when assessing climate sensitivity over the historical period. Here, we quantify and explain a crucial but often overlooked source of uncertainty in aerosol forcing: the temporal variability of aerosol emissions. We show that time-variability in biomass burning (BB) emissions weakens the time-averaged total aerosol forcing, particularly in the Northern Hemisphere mid- to high-latitudes. BB emissions variability produces weaker (less negative) mean effective radiative forcing (ERF) compared to scenarios with no interannual variability in emissions. Satellite-estimated BB emissions (and associated variability) result in a June–September absolute ERF (relative to zero BB emissions) of −7.7 W m−2 from 50° to 70°N, compared to −10.4 W m−2 when no emissions variability is used in the Community Earth System Model version 2 (CESM2). This difference in forcing is attributable to nonlinear aerosol-cloud interactions. Aerosol forcing will be overestimated (i.e., more negative) if emissions are temporally-smoothed. | en_US |
| dc.description.reviewstatus | Reviewed | en_US |
| dc.description.scholarlevel | Faculty | en_US |
| dc.description.sponsorship | Natural Sciences and Engineering Council of Canada University of Victoria DARPA-AIE-ACTM-AIBEDO National Center for Atmospheric Research National Science Foundation | en_US |
| dc.identifier.citation | Heyblom, K. B., Singh, H. A., Rasch, P. J., & Hirasawa, H. (2023). Variability in biomass burning emissions weakens aerosol forcing due to nonlinear aerosol-cloud interactions. Geophysical Research Letters, 50, e2022GL102685. https://doi.org/10.1029/2022GL102685 | en_US |
| dc.identifier.uri | https://doi.org/10.1029/2022GL102685 | |
| dc.identifier.uri | http://hdl.handle.net/1828/15162 | |
| dc.language.iso | en | en_US |
| dc.publisher | Geophysical Research Letters | en_US |
| dc.subject.department | School of Earth and Ocean Sciences | |
| dc.title | Variability in Biomass Burning Emissions Weakens Aerosol Forcing Due To Nonlinear Aerosol-Cloud Interactions | en_US |
| dc.type | Article | en_US |