Journal
NATURE GEOSCIENCE
Volume 15, Issue 1, Pages 42-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41561-021-00876-0
Keywords
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Categories
Funding
- Academy of Finland via Center of Excellence in Atmospheric Sciences [272041]
- Flagship programme for Atmospheric and Climate Competence Center (ACCC) [337549, 337552, 337550, 317380, 320094, 334792, 328290, 302958, 325656, 316114, 325647, 325681, 341271]
- European Research Council [227463-ATMNUCLE, 742206-ATM-GTP, 638703-COALA, 714621-GASPARCON]
- Arena for the gap analysis of the existing Arctic Science Co-Operations (AASCO) - Prince Albert Foundation [2859]
- 'Quantifying carbon sink, CarbonSink+ and their interaction with air quality' INAR project - Jane and Aatos Erkko Foundation
- Office of Science (BER), US Department of Energy via BAECC [DE-SC0010711]
- BAECC-SNEX (Moisseev)
- European Commission via project FORCeS
- European Commission via project ACTRIS
- European Commission via project ACTRIS-TNA
- European Commission via project ACTRIS2
- European Commission via project ACTRIS-IMP
- European Commission via project BACCHUS
- European Commission via project eLTER
- European Commission via project ICOS
- European Commission via project PEGASOS
- European Commission via project Nordforsk via Cryosphere-Atmosphere Interactions in a Changing Arctic Climate, CRAICC
- NASA Global Precipitation Measurement (GPM) Mission ground validation programme
- ARM
- Department of Energy, Assistant Secretary for Environmental Management, Office of Science and Technology [DE-AC02-06CH11357]
- AMF2
- SMEAR2
- BAECC community
- U.S. Department of Energy (DOE) [DE-SC0010711] Funding Source: U.S. Department of Energy (DOE)
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Research shows that aerosol emissions from the boreal forest biosphere have a significant impact on warm cloud microphysics and cloud-aerosol interactions, potentially mitigating climate change on a continental scale.
Boreal forest acts as a carbon sink and contributes to the formation of secondary organic aerosols via emission of aerosol precursor compounds. However, these influences on the climate system are poorly quantified. Here we show direct observational evidence that aerosol emissions from the boreal forest biosphere influence warm cloud microphysics and cloud-aerosol interactions in a scale-dependent and highly dynamic manner. Analyses of in situ and ground-based remote-sensing observations from the SMEAR II station in Finland, conducted over eight months in 2014, reveal substantial increases in aerosol load over the forest one to three days after aerosol-poor marine air enters the forest environment. We find that these changes are consistent with secondary organic aerosol formation and, together with water-vapour emissions from evapotranspiration, are associated with changes in the radiative properties of warm, low-level clouds. The feedbacks between boreal forest emissions and aerosol-cloud interactions and the highly dynamic nature of these interactions in air transported over the forest over timescales of several days suggest boreal forests have the potential to mitigate climate change on a continental scale. Our findings suggest that even small changes in aerosol precursor emissions, whether due to changing climatic or anthropogenic factors, may substantially modify the radiative properties of clouds in moderately polluted environments. Emissions from the boreal forest biosphere can substantially increase aerosol load above the forest and influence the radiative properties of clouds, according to analysis of observations from a monitoring station in Finland.
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