Repozitorij Univerze v Novi Gorici

Izpis gradiva
A+ | A- | Pomoč | SLO | ENG

Naslov:The effect of the averaging period for PMF analysis of aerosol mass spectrometer measurements during offline applications
Avtorji:ID Vasilakopoulou, Christina (Avtor)
ID Stavroulas, Iasonas (Avtor)
ID Mihalopoulos, Nikolaos (Avtor)
ID Pandis, Spyros N. (Avtor)
Datoteke:URL https://doi.org/10.5194/amt-15-6419-2022
 
.pdf amt-15-6419-2022.pdf (3,75 MB)
MD5: 68B55B461D62F34B2398DFE77EC8CD12
 
URL https://amt.copernicus.org/articles/15/6419/2022/amt-15-6419-2022.pdf
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Offline aerosol mass spectrometer (AMS) measurements can provide valuable information about ambient organic aerosols in areas and periods in which online AMS measurements are not available. However, these offline measurements have a low temporal resolution, as they are based on filter samples usually collected over 24 h. In this study, we examine whether and how this low time resolution affects source apportionment results. We used a five-month period (November 2016–March 2017) of online measurements in Athens, Greece, and performed positive matrix factorization (PMF) analysis to both the original dataset, which consists of 30 min measurements, and to time averages from 1 up to 24 h. The 30 min results indicated that five factors were able to represent the ambient organic aerosol (OA): a biomass burning organic aerosol factor (BBOA), which contributed 16 % of the total OA; hydrocarbon-like OA (HOA) (29 %); cooking OA (COA) (20 %); more-oxygenated OA (MO-OOA) (18 %); and less-oxygenated OA (LO-OOA) (17 %). Use of the daily averages resulted in estimated average contributions that were within 8 % of the total OA compared with the high-resolution analysis for the five-month period. The most important difference was for the BBOA contribution, which was overestimated (25 % for low resolution versus 17 % for high resolution) when daily averages were used. The estimated secondary OA varied from 35 % to 28 % when the averaging interval varied between 30 min and 24 h. The high-resolution results are expected to be more accurate, both because they are based on much larger datasets and because they are based on additional information about the temporal source variability. The error for the low-resolution analysis was much higher for individual days, and its results for high-concentration days in particular are quite uncertain. The low-resolution analysis introduces errors in the determined AMS profiles for the BBOA and LO-OOA factors but determines the rest relatively accurately (theta angle around 10∘ or less).
Ključne besede:AMS, offline PMF, ACSM, organic aerosols
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.11.2022
Leto izida:2022
Št. strani:str. 6419–6431
Številčenje:Vol. 15, iss. 21
PID:20.500.12556/RUNG-9032 Novo okno
COBISS.SI-ID:195012611 Novo okno
UDK:53
ISSN pri članku:1867-1381
eISSN:1867-8548
DOI:10.5194/amt-15-6419-2022 Novo okno
NUK URN:URN:SI:UNG:REP:NZ649U2K
Datum objave v RUNG:10.05.2024
Število ogledov:451
Število prenosov:3
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
:
Kopiraj citat
  
Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
Objavi na:Bookmark and Share


Postavite miškin kazalec na naslov za izpis povzetka. Klik na naslov izpiše podrobnosti ali sproži prenos.

Gradivo je del revije

Naslov:Atmospheric measurement techniques
Skrajšan naslov:Atmos. meas. tech.
Založnik:Copernicus Publications
ISSN:1867-1381
COBISS.SI-ID:517910809 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:08.11.2022

Nazaj