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Naslov:Assessment of the COVID-19 lockdown effects on spectral aerosol scattering and absorption properties in Athens, Greece
Avtorji:ID Kaskaoutis, Dimitris G. (Avtor)
ID Grivas, Georgios (Avtor)
ID Liakakou, Eleni (Avtor)
ID Kalivitis, Nikos (Avtor)
ID Kouvarakis, Giorgos (Avtor)
ID Stavroulas, Iasonas (Avtor)
ID Kalkavouras, Panayiotis (Avtor)
ID Zarmpas, Pavlos (Avtor)
ID Dumka, Umesh Chandra (Avtor)
ID Gerasopoulos, Evangelos (Avtor)
ID Mihalopoulos, Nikolaos (Avtor)
Datoteke:URL https://www.mdpi.com/2073-4433/12/2/231
 
.pdf atmosphere-12-00231.pdf (8,69 MB)
MD5: 4987000585EC12F16CA6144F3AEFCFB4
 
URL https://www.mdpi.com/2073-4433/12/2/231/pdf
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:COVID-19 is evolving into one of the worst pandemics in recent history, claiming a death toll of over 1.5 million as of December 2020. In an attempt to limit the expansion of the pandemic in its initial phase, nearly all countries imposed restriction measures, which resulted in an unprecedented reduction of air pollution. This study aims to assess the impact of the lockdown effects due to COVID-19 on in situ measured aerosol properties, namely spectral-scattering (bsca) and absorption (babs) coefficients, black carbon (BC) concentrations, single-scattering albedo (SSA), scattering and absorption Ångström exponents (SAE, AAE) in Athens, Greece. Moreover, a comparison is performed with the regional background site of Finokalia, Crete, for a better assessment of the urban impact on observed differences. The study examines pre-lockdown (1–22 March 2020), lockdown (23 March–3 May 2020) and post-lockdown (4–31 May 2020) periods, while the aerosol properties are also compared with a 3–4 year preceding period (2016/2017–2019). Comparison of meteorological parameters in Athens, between the lockdown period and respective days in previous years, showed only marginal variation, which is not deemed sufficient in order to justify the notable changes in aerosol concentrations and optical properties. The largest reduction during the lockdown period was observed for babs compared to the pre-lockdown (−39%) and to the same period in previous years (−36%). This was intensified during the morning traffic hours (−60%), reflecting the large decrease in vehicular emissions. Furthermore, AAE increased during the lockdown period due to reduced emissions from fossil-fuel combustion, while a smaller (−21%) decrease was observed for bsca along with slight increases (6%) in SAE and SSA values, indicating that scattering aerosol properties were less affected by the decrease in vehicular emissions, as they are more dependent on regional sources and atmospheric processing. Nighttime BC emissions related to residential wood-burning were slightly increased during the lockdown period, with respect to previous-year means. On the contrary, aerosol and pollution changes during the lockdown period at Finokalia were low and highly sensitive to natural sources and processes.
Ključne besede:COVID-19, traffic, aerosol scattering, absorption, SSA, Greece
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.01.2021
Leto izida:2021
Št. strani:str. 1-24
Številčenje:Vol. 12, issue 2, [article no.] 231
PID:20.500.12556/RUNG-9037 Novo okno
COBISS.SI-ID:195039491 Novo okno
UDK:53
ISSN pri članku:2073-4433
eISSN:2073-4433
DOI:10.3390/atmos12020231 Novo okno
NUK URN:URN:SI:UNG:REP:53EEQSUA
Datum objave v RUNG:10.05.2024
Število ogledov:361
Število prenosov:3
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Atmosphere
Skrajšan naslov:Atmosphere
Založnik:MDPI AG
ISSN:2073-4433
COBISS.SI-ID:522992153 Novo okno

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:08.02.2021

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