Rapid growth of anthropogenic organic nanoparticles greatly alters cloud life cycle in the Amazon rainforest

Autor(es):Mostrar menos -

Zaveri, Rahul A. ^[1] ; Wang, Jian ^[2] ; Fan, Jiwen ^[1] ; Zhang, Yuwei ^[1] ; Shilling, John E. ^[1] ; Zelenyuk, Alla ^[1] ; Mei, Fan ^[1] ; Newsom, Rob ^[1] ; Pekour, Mikhail ^[1] ; Tomlinson, Jason ^[1] ; Comstock, Jennifer M. ^[1] ; Shrivastava, Manish ^[1] ; Fortner, Edward ^[3] ; Machado, Luiz A. T. ^[4] ; Artaxo, Paulo ^[5] ; Martin, Scot T. ^[6]

Afiliação do(s) autor(es)

^[1] Pacific Northwest Natl Lab, Richland, WA 99352 - USA

^[2] Washington Univ, St Louis, MO 63130 - USA

^[3] Aerodyne Res Inc, Billerica, MA 01821 - USA

^[4] Natl Inst Space Res, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[5] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo - Brazil

^[6] Harvard Univ, Cambridge, MA 02138 - USA

• Tipo de documento: Artigo Científico
• Fonte: SCIENCE ADVANCES; v. 8, n. 2 JAN 2022.
• Citações Web of Science: 0

Resumo

Aerosol-cloud interactions remain uncertain in assessing climate change. While anthropogenic activities produce copious aerosol nanoparticles smaller than 10 nanometers, they are too small to act as efficient cloud condensation nuclei (CCN). The mechanisms responsible for particle growth to CCN-relevant sizes are poorly understood. Here, we present aircraft observations of rapid growth of anthropogenic nanoparticles downwind of an isolated metropolis in the Amazon rainforest. Model analysis reveals that the sustained particle growth to CCN sizes is predominantly caused by particle-phase diffusion-limited partitioning of semivolatile oxidation products of biogenic hydrocarbons. Cloud-resolving numerical simulations show that the enhanced CCN concentrations in the urban plume substantially alter the formation of shallow convective clouds, suppress precipitation, and enhance the transition to deep convective clouds. The proposed nanoparticle growth mechanism, expressly enabled by the abundantly formed semivolatile organics, suggests an appreciable impact of anthropogenic aerosols on cloud life cycle in previously unpolluted forests of the world. (AU)

• Processo FAPESP: 17/17047-0 - O ciclo de vida de aerossóis e nuvens na Amazônia: emissões biogênicas, emissões de queimadas e impactos no ecossistema
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 13/05014-0 - GoAmazon: interação da pluma urbana de Manaus com emissões biogênicas da Floresta Amazônica
• Beneficiário: Paulo Eduardo Artaxo Netto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático