Swarup China (Avtor), Peter A. Alpert (Avtor), Bo Zhang (Avtor), Simeon K. Schum (Avtor), Katja Džepina (Avtor), Kendra Wright (Avtor), R. Chris Owen (Avtor), Paulo Fialho (Avtor), Lynn R. Mazzoleni (Avtor), Claudio Mazzoleni (Avtor)

Povzetek

Long-range transported free tropospheric particles can play a significant role on heterogeneous ice nucleation. Using optical and electron microscopy we examine the physicochemical characteristics of ice nucleating particles (INPs). Particles were collected on substrates from the free troposphere at the remote Pico Mountain Observatory in the Azores Islands, after long-range transport and aging over the Atlantic Ocean. We investigate four specific events to study the ice formation potential by the collected particles with different ages and transport patterns. We use single-particle analysis, as well as bulk analysis to characterize particle populations. Both analyses show substantial differences in particle composition between samples from the four events; in addition, single-particle microscopy analysis indicates that most particles are coated by organic material. The identified INPs contained mixtures of dust, aged sea salt and soot, and organic material acquired either at the source or during transport. The temperature and relative humidity (RH) at which ice formed, varied only by 5% between samples, despite differences in particle composition, sources, and transport patterns. We hypothesize that this small variation in the onset RH may be due to the coating material on the particles. This study underscores and motivates the need to further investigate how long-range transported and atmospherically aged free tropospheric particles impact ice cloud formation.

Ključne besede

atmospheric aerosols;ice nucleating particles;long-range transport;optical microscopy;electron microscopy;Pico Mountain Observatory;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UNG - Univerza v Novi Gorici
UDK: 551.5
COBISS: 59042051 Povezava se bo odprla v novem oknu
ISSN: 2169-8996
Št. ogledov: 1500
Št. prenosov: 129
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

URN: URN:SI:UNG
Strani: str. 3065-3079
Letnik: ǂVol. ǂ122
Zvezek: ǂno. ǂ5
Čas izdaje: 2017
DOI: 10.1002/2016JD025817
ID: 12757733