Pereira Freitas Gabriel, Adachi Kouji, Conen Franz, Heslin-Rees Dominic, Krejci Radovan, Tobo Yutaka, Yttri Karl Espen, Zieger Paul
Department of Environmental Science, Stockholm University, Stockholm, Sweden.
Bolin Centre for Climate Research, Stockolm University, Stockholm, Sweden.
Nat Commun. 2023 Sep 28;14(1):5997. doi: 10.1038/s41467-023-41696-7.
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 10-10 L 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.
原生生物气溶胶颗粒（PBAP）在气候系统中起着重要作用，促进云层内冰的形成，因此PBAP对于理解快速变化的北极地区可能很重要。在这项研究中，我们使用单颗粒荧光光谱法在北极山区站点识别和量化PBAP，并通过透射电子显微镜分析来支持PBAP的存在。我们发现PBAP浓度在10-10升之间，且在夏季达到峰值。有证据表明，考虑到与气温、地表反照率、地表植被和PBAP示踪剂的高度相关性，北极陆地生物圈是PBAP的一个重要区域来源。PBAP与高温冰核粒子（INP）（>-15°C）明显相关，其中夏季很大一部分（>90%）是蛋白质类的，这意味着其具有生物来源。这些发现将有助于更好地理解北极PBAP的来源和特征及其与INP的联系。
