Brown carbon absorption in the red and near-infrared spectral region

András Hoffer, Ádám Tóth, Mihály Pósfai, Chul Eddy Chung, András Gelencsér

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Black carbon (BC) aerosols have often been assumed to be the only light-absorbing carbonaceous particles in the red and near-infrared spectral regions of solar radiation in the atmosphere. Here we report that tar balls (a specific type of organic aerosol particles from biomass burning) do absorb red and near-infrared radiation significantly. Tar balls were produced in a laboratory experiment, and their chemical and optical properties were measured. The absorption of these particles in the range between 470 and 950 nm was measured with an aethalometer, which is widely used to measure atmospheric aerosol absorption. We find that the absorption coefficient of tar balls at 880 nm is more than 10% of that at 470 nm. The considerable absorption of red and infrared light by tar balls also follows from their relatively low absorption Ångström coefficient (and significant mass absorption coefficient) in the spectral range between 470 and 950 nm. Our results support the previous finding that tar balls may play an important role in global warming. Due to the non-negligible absorption of tar balls in the near-infrared region, the absorption measured in the field at near-infrared wavelengths cannot solely be due to soot particles.

Original languageEnglish
Pages (from-to)2353-2359
Number of pages7
JournalAtmospheric Measurement Techniques
Volume10
Issue number6
DOIs
Publication statusPublished - Jun 28 2017

ASJC Scopus subject areas

  • Atmospheric Science

Fingerprint Dive into the research topics of 'Brown carbon absorption in the red and near-infrared spectral region'. Together they form a unique fingerprint.

  • Cite this