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Sökning: onr:"swepub:oai:DiVA.org:su-200097" > Identifying source ...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004702naa a2200421 4500
001oai:DiVA.org:su-200097
003SwePub
008211230s2021 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2000972 URI
0247 a https://doi.org/10.5194/acp-21-16453-20212 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Aliaga, Diego4 aut
2451 0a Identifying source regions of air masses sampled at the tropical high-altitude site of Chacaltaya using WRF-FLEXPART and cluster analysis
264 c 2021-11-10
264 1b Copernicus GmbH,c 2021
338 a print2 rdacarrier
520 a Observations of aerosol and trace gases in the remote troposphere are vital to quantify background concentrations and identify long-term trends in atmospheric composition on large spatial scales. Measurements made at high altitude are often used to study free-tropospheric air; however such high-altitude sites can be influenced by boundary layer air masses. Thus, accurate information on air mass origin and transport pathways to high-altitude sites is required. Here we present a new method, based on the source-receptor relationship (SRR) obtained from backwards WRF-FLEXPART simulations and a k-means clustering approach, to identify source regions of air masses arriving at measurement sites. Our method is tailored to areas of complex terrain and to stations influenced by both local and long-range sources. We have applied this method to the Chacaltaya (CHC) GAW station (5240 m a.s.l.; 16.35 degrees S, 68.13 degrees W) for the 6-month duration of the Southern Hemisphere high-altitude experiment on particle nucleation and growth (SALILNA) to identify where sampled air masses originate and to quantify the influence of the surface and the free troposphere. A key aspect of our method is that it is probabilistic, and for each observation time, more than one air mass (cluster) can influence the station, and the percentage influence of each air mass can be quantified. This is in contrast to binary methods, which label each observation time as influenced by either boundary layer or free-troposphere air masses. Air sampled at CHC is a mix of different provenance. We find that on average 9 % of the air, at any given observation time, has been in contact with the surface within 4 d prior to arriving at CHC. Furthermore, 24 % of the air has been located within the first 1.5 km above ground level (surface included). Consequently, 76 % of the air sampled at CHC originates from the free troposphere. However, pure free-tropospheric influences are rare, and often samples are concurrently influenced by both boundary layer and free-tropospheric air masses. A clear diurnal cycle is present, with very few air masses that have been in contact with the surface being detected at night. The 6-month analysis also shows that the most dominant air mass (cluster) originates in the Amazon and is responsible for 29 % of the sampled air. Furthermore, short-range clusters (origins within 100 km of CHC) have high temporal frequency modulated by local meteorology driven by the diurnal cycle, whereas the mid- and long-range clusters' (> 200 km) variability occurs on timescales governed by synoptic-scale dynamics. To verify the reliability of our method, in situ sulfate observations from CHC are combined with the SRR clusters to correctly identify the (pre-known) source of the sulfate: the Sabancaya volcano located 400 km north-west from the station.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
7001 a Sinclair, Victoria A.4 aut
7001 a Andrade, Marcos4 aut
7001 a Artaxo, Paulo4 aut
7001 a Carbone, Samara4 aut
7001 a Kadantsev, Evgeny4 aut
7001 a Laj, Paolo4 aut
7001 a Wiedensohler, Alfred4 aut
7001 a Krejci, Radovanu Stockholms universitet,Institutionen för miljövetenskap4 aut0 (Swepub:su)krejc
7001 a Bianchi, Federico4 aut
7102 a Stockholms universitetb Institutionen för miljövetenskap4 org
7730 t Atmospheric Chemistry And Physicsd : Copernicus GmbHg 21:21, s. 16453-16477q 21:21<16453-16477x 1680-7316x 1680-7324
8564 u https://doi.org/10.5194/acp-21-16453-2021y Fulltext
8564 u https://acp.copernicus.org/articles/21/16453/2021/acp-21-16453-2021.pdf
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-200097
8564 8u https://doi.org/10.5194/acp-21-16453-2021

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