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A platform for research: civil engineering, architecture and urbanism
Measurements of brown carbon and its optical properties from boreal forest fires in Alaska summer
https://orcid.org/0000-0003-4361-9746
https://orcid.org/0009-0000-8805-7877
https://orcid.org/0000-0002-2599-8300
https://orcid.org/0009-0003-9738-3393
https://orcid.org/0000-0002-2311-7506
https://orcid.org/0000-0002-4774-9751
Abstract Brown carbon (BrC) plays an important role in global radiative budget but there have been few studies on BrC in Arctic despite rapid warming and increasing wildfires in this region. Here we investigate the optical properties of BrC from boreal fires in Alaska summer, with two sets of measurements from PILS-LWCC-TOC (Particle-Into-Liquid-Sampler – Liquid-Waveguide Capillary flow-through optical Cell - Total-Organic-Carbon analyzer) and filter measurements. We show that during intense wildfires, the mass absorption coefficient at 365 nm (MAC365) from water soluble organic carbon (WSOC) remained stable at ∼1 m2 g−1. With all plumes sampled and derived transport time, we show a decrease of MAC365 with plume age, with a shorter photobleaching lifetime (∼11 h) at 365 nm compared to 405 nm (∼20 h). The total absorption by organic aerosols measured from filters at 365 nm is higher than the absorption by WSOC by a factor 2–3, suggesting a dominant role of insoluble organic carbon. Overall BrC dominates absorption in the near-ultraviolet and visible radiation during wildfire season in Alaska summer.
Measurements of brown carbon and its optical properties from boreal forest fires in Alaska summer
https://orcid.org/0000-0003-4361-9746
https://orcid.org/0009-0000-8805-7877
https://orcid.org/0000-0002-2599-8300
https://orcid.org/0009-0003-9738-3393
https://orcid.org/0000-0002-2311-7506
https://orcid.org/0000-0002-4774-9751
Abstract Brown carbon (BrC) plays an important role in global radiative budget but there have been few studies on BrC in Arctic despite rapid warming and increasing wildfires in this region. Here we investigate the optical properties of BrC from boreal fires in Alaska summer, with two sets of measurements from PILS-LWCC-TOC (Particle-Into-Liquid-Sampler – Liquid-Waveguide Capillary flow-through optical Cell - Total-Organic-Carbon analyzer) and filter measurements. We show that during intense wildfires, the mass absorption coefficient at 365 nm (MAC365) from water soluble organic carbon (WSOC) remained stable at ∼1 m2 g−1. With all plumes sampled and derived transport time, we show a decrease of MAC365 with plume age, with a shorter photobleaching lifetime (∼11 h) at 365 nm compared to 405 nm (∼20 h). The total absorption by organic aerosols measured from filters at 365 nm is higher than the absorption by WSOC by a factor 2–3, suggesting a dominant role of insoluble organic carbon. Overall BrC dominates absorption in the near-ultraviolet and visible radiation during wildfire season in Alaska summer.
Measurements of brown carbon and its optical properties from boreal forest fires in Alaska summer
https://orcid.org/0000-0003-4361-9746
https://orcid.org/0009-0000-8805-7877
https://orcid.org/0000-0002-2599-8300
https://orcid.org/0009-0003-9738-3393
https://orcid.org/0000-0002-2311-7506
https://orcid.org/0000-0002-4774-9751
Abstract Brown carbon (BrC) plays an important role in global radiative budget but there have been few studies on BrC in Arctic despite rapid warming and increasing wildfires in this region. Here we investigate the optical properties of BrC from boreal fires in Alaska summer, with two sets of measurements from PILS-LWCC-TOC (Particle-Into-Liquid-Sampler – Liquid-Waveguide Capillary flow-through optical Cell - Total-Organic-Carbon analyzer) and filter measurements. We show that during intense wildfires, the mass absorption coefficient at 365 nm (MAC365) from water soluble organic carbon (WSOC) remained stable at ∼1 m2 g−1. With all plumes sampled and derived transport time, we show a decrease of MAC365 with plume age, with a shorter photobleaching lifetime (∼11 h) at 365 nm compared to 405 nm (∼20 h). The total absorption by organic aerosols measured from filters at 365 nm is higher than the absorption by WSOC by a factor 2–3, suggesting a dominant role of insoluble organic carbon. Overall BrC dominates absorption in the near-ultraviolet and visible radiation during wildfire season in Alaska summer.
Measurements of brown carbon and its optical properties from boreal forest fires in Alaska summer
Bali, Kunal (author) / Banerji, Sujai (author) / Campbell, James R. (author) / Bhakta, Aachal Vallabhbhai (author) / Chen, L.-W. Antony (author) / Holmes, Christopher D. (author) / Mao, Jingqiu (author)
Atmospheric Environment ; 324
2024-02-27
Article (Journal)
Electronic Resource
English
Gaseous emissions from Canadian boreal forest fires
| NTRS | 1990
Lightning-Caused Forest Fires in Alaska
| British Library Conference Proceedings | 2003
Net Carbon Exchange Across the Arctic Tundra-Boreal Forest Transition in Alaska 1981–2000
| Online Contents | 2006