skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices
Tipo de recurso Mostra resultados com: Mostra resultados com: Índice

Molecular compositions, optical properties, and implications of dissolved brown carbon in snow/ice on the Tibetan Plateau glaciers

Li, Xiaofei ; Fu, Pingqing ; Tripathee, Lekhendra ; Yan, Fangping ; Hu, Zhaofu ; Yu, Feng ; Chen, Qian ; Li, Jinwen ; Chen, Qingcai ; Cao, Junji ; Kang, Shichang

Environment international, 2022-06, Vol.164, p.107276-107276, Article 107276 [Periódico revisado por pares]

Netherlands: Elsevier Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Molecular compositions, optical properties, and implications of dissolved brown carbon in snow/ice on the Tibetan Plateau glaciers
  • Autor: Li, Xiaofei ; Fu, Pingqing ; Tripathee, Lekhendra ; Yan, Fangping ; Hu, Zhaofu ; Yu, Feng ; Chen, Qian ; Li, Jinwen ; Chen, Qingcai ; Cao, Junji ; Kang, Shichang
  • Assuntos: Dissolved brown carbon ; Glacier melt ; Molecular compositions ; Optical properties ; Tibetan Plateau
  • É parte de: Environment international, 2022-06, Vol.164, p.107276-107276, Article 107276
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] Brown carbon (BrC)/water-soluble organic carbon (WSOC) plays a crucial role in glacier melting. A quantitative evaluation of the light absorption characteristics of WSOC on glacier melting is urgently needed, as the WSOC release from glaciers potentially affects the hydrological cycle, downstream ecological balance, and the global carbon cycle. In this work, the optical properties and composition of WSOC in surface snow/ice on four Tibetan Plateau (TP) glaciers were investigated using a three-dimensional fluorescence spectrometer and electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The total light-absorption of WSOC in snow/ice at 250–400 nm (ultraviolet region) and 400–600 nm (visible region) accounted for about 60.42% and 27.17% of the light absorption by the total organics, respectively. Two protein-like substances (PRLIS), one humic-like substance (HULIS), and one undefined species of chromophores in snow/ice on the TP glacier surfaces were identified. The lignins and lipids were the main compounds in the TP glaciers and were presented as CHO and CHNO molecules, while CHNOS molecules were only observed in the southeast TP glacier. The light absorption capacity of WSOC in snow/ice was mainly affected by their oxidizing properties. PRLIS and undefined species were closely linked to microbial sources and the local environment of the glaciers (lignins and lipids), while HULIS was significantly affected by anthropogenic emissions (protein/amino sugars). Radiative forcing (RF)-induced by WSOC relative to black carbon were accounted for about 11.62 ± 12.07% and 8.40 ± 10.37% in surface snow and granular ice, respectively. The RF was estimated to be 1.14 and 6.36 W m−2 in surface snow and granular ice, respectively, during the melt season in the central TP glacier. These findings contribute to our understanding of WSOC’s impact on glaciers and could serve as a baseline for WSOC research in cryospheric science.
  • Editor: Netherlands: Elsevier Ltd
  • Idioma: Inglês
Links
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.