title: High natural aerosol loading over boreal forests.
abstract: Aerosols play a key role in the radiation balance of the atmosphere. Here, we present evidence that the European boreal region is a substantial source of both aerosol mass and aerosol number. The investigation supplies a straightforward relation between emissions of monoterpenes and gas-to-particle formation over regions substantially lacking in anthropogenic aerosol sources. Our results show that the forest provides an aerosol population of 1000 to 2000 particles of climatically active sizes per cubic centimeter during the late spring to early fall period. This has important implications for radiation budget estimates and relevancy for the evaluation of feedback loops believed to determine our future climate.
authors.affiliation: Department of Applied Environmental Science (ITM), Air Pollution Laboratory, Frescativägen 54, SE-106 91, Stockholm, Sweden. peter.tunved@itm.su.se
authors.forename: P
authors.initials: P
authors.lastname: Tunved
authors.forename: H-C
authors.initials: HC
authors.lastname: Hansson
authors.forename: V-M
authors.initials: VM
authors.lastname: Kerminen
authors.forename: J
authors.initials: J
authors.lastname: Ström
authors.forename: M Dal
authors.initials: MD
authors.lastname: Maso
authors.forename: H
authors.initials: H
authors.lastname: Lihavainen
authors.forename: Y
authors.initials: Y
authors.lastname: Viisanen
authors.forename: P P
authors.initials: PP
authors.lastname: Aalto
authors.forename: M
authors.initials: M
authors.lastname: Komppula
authors.forename: M
authors.initials: M
authors.lastname: Kulmala
mesh_terms: D000336:Aerosols; D001272:Atmosphere; D002980:Climate; D017753:Ecosystem; D005740:Gases; D010084:Oxidation-Reduction; D010316:Particle Size; D012537:Scandinavian and Nordic Countries; D012621:Seasons; D013729:Terpenes / Q000737:chemistry; D014197:Trees
chemical_list: D000336:Aerosols; D005740:Gases; D013729:Terpenes