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- Title
Regionally sourced bioaerosols drive high-temperature ice nucleating particles in the Arctic.
- Authors
Pereira Freitas, Gabriel; Adachi, Kouji; Conen, Franz; Heslin-Rees, Dominic; Krejci, Radovan; Tobo, Yutaka; Yttri, Karl Espen; Zieger, Paul
- Abstract
Primary biological aerosol particles (PBAP) play an important role in the climate system, facilitating the formation of ice within clouds, consequently PBAP may be important in understanding the rapidly changing Arctic. Within this work, we use single-particle fluorescence spectroscopy to identify and quantify PBAP at an Arctic mountain site, with transmission electronic microscopy analysis supporting the presence of PBAP. We find that PBAP concentrations range between 10−3–10−1 L−1 and peak in summer. Evidences suggest that the terrestrial Arctic biosphere is an important regional source of PBAP, given the high correlation to air temperature, surface albedo, surface vegetation and PBAP tracers. PBAP clearly correlate with high-temperature ice nucleating particles (INP) (>-15 °C), of which a high a fraction (>90%) are proteinaceous in summer, implying biological origin. These findings will contribute to an improved understanding of sources and characteristics of Arctic PBAP and their links to INP. Primary bioaerosols, important for clouds and climate, were measured at an Arctic mountain site and traced to regional sources. Their seasonality was observed to peak in summer, where they significantly contribute to high-temperature ice nucleating particles.
- Subjects
ARCTIC regions; ATMOSPHERIC temperature; ICE clouds; FLUORESCENCE spectroscopy; TUNDRAS; ALBEDO; AEROSOLS; MICROBIOLOGICAL aerosols
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-41696-7