Výsledky vyhledávání - "I. Kourtchev"

Akademický článek

Impact of anthropogenic and biogenic sources on the seasonal variation in the molecular composition of urban organic aerosols: a field and laboratory study using ultra-high-resolution mass spectrometry

Autor: K. R. Daellenbach, I. Kourtchev, A. L. Vogel, E. A. Bruns, J. Jiang, T. Petäjä, J.-L. Jaffrezo, S. Aksoyoglu, M. Kalberer, U. Baltensperger, I. El Haddad, A. S. H. Prévôt

Publikováno v: Atmospheric Chemistry and Physics, Vol 19, Pp 5973-5991 (2019)

This study presents the molecular composition of organic aerosol (OA) using ultra-high-resolution mass spectrometry (Orbitrap) at an urban site in Central Europe (Zurich, Switzerland). Specific source spectra were also analysed, including samples rep

Externí odkaz: https://doaj.org/article/abc2cbef1b45462f93e345ceb0dba5f9

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Akademický článek

Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons

Publikováno v: Atmospheric Chemistry and Physics, Vol 18, Pp 10433-10457 (2018)

Biogenic volatile organic compounds (BVOCs) from the Amazon forest region represent the largest source of organic carbon emissions to the atmosphere globally. These BVOC emissions dominantly consist of volatile and intermediate-volatility terpenoi

Externí odkaz: https://doaj.org/article/f420a614ae7641f08455caea48dd601c

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Akademický článek

Multiphase composition changes and reactive oxygen species formation during limonene oxidation in the new Cambridge Atmospheric Simulation Chamber (CASC)

Autor: P. J. Gallimore, B. M. Mahon, F. P. H. Wragg, S. J. Fuller, C. Giorio, I. Kourtchev, M. Kalberer

Publikováno v: Atmospheric Chemistry and Physics, Vol 17, Pp 9853-9868 (2017)

The chemical composition of organic aerosols influences their impacts on human health and the climate system. Aerosol formation from gas-to-particle conversion and in-particle reaction was studied for the oxidation of limonene in a new facility, t

Externí odkaz: https://doaj.org/article/a1e4975b97be478482463fb7f0a2ce47

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Akademický článek

Molecular composition of organic aerosols in central Amazonia: an ultra-high-resolution mass spectrometry study

Autor: I. Kourtchev, R. H. M. Godoi, S. Connors, J. G. Levine, A. T. Archibald, A. F. L. Godoi, S. L. Paralovo, C. G. G. Barbosa, R. A. F. Souza, A. O. Manzi, R. Seco, S. Sjostedt, J.-H. Park, A. Guenther, S. Kim, J. Smith, S. T. Martin, M. Kalberer

Publikováno v: Atmospheric Chemistry and Physics, Vol 16, Pp 11899-11913 (2016)

The Amazon Basin plays key role in atmospheric chemistry, biodiversity and climate change. In this study we applied nanoelectrospray (nanoESI) ultra-high-resolution mass spectrometry (UHRMS) for the analysis of the organic fraction of PM2.5 aeroso

Externí odkaz: https://doaj.org/article/ca5862f671964f5b9692eb6c0a9ed046

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Akademický článek

Cloud condensation nuclei activity, droplet growth kinetics, and hygroscopicity of biogenic and anthropogenic secondary organic aerosol (SOA)

Autor: D. F. Zhao, A. Buchholz, B. Kortner, P. Schlag, F. Rubach, H. Fuchs, A. Kiendler-Scharr, R. Tillmann, A. Wahner, Å. K. Watne, M. Hallquist, J. M. Flores, Y. Rudich, K. Kristensen, A. M. K. Hansen, M. Glasius, I. Kourtchev, M. Kalberer, Th. F. Mentel

Publikováno v: Atmospheric Chemistry and Physics, Vol 16, Pp 1105-1121 (2016)

Interaction of biogenic volatile organic compounds (VOCs) with Anthropogenic VOC (AVOC) affects the physicochemical properties of secondary organic aerosol (SOA). We investigated cloud droplet activation (CCN activity), droplet growth kinetics, and

Externí odkaz: https://doaj.org/article/fc69b75a76f64e6fa6a4df0eb651ac81

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Akademický článek

Molecular composition of fresh and aged secondary organic aerosol from a mixture of biogenic volatile compounds: a high-resolution mass spectrometry study

Autor: I. Kourtchev, J.-F. Doussin, C. Giorio, B. Mahon, E. M. Wilson, N. Maurin, E. Pangui, D. S. Venables, J. C. Wenger, M. Kalberer

Publikováno v: Atmospheric Chemistry and Physics, Vol 15, Iss 10, Pp 5683-5695 (2015)

Field observations over the past decade indicate that a significant fraction of organic aerosol in remote areas may contain highly oxidized molecules. Aerosol processing or further oxidation (aging) of organic aerosol has been suggested to be respons

Externí odkaz: https://doaj.org/article/5dca5a8298db4eddba40d5fb798f0616

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Akademický článek

Molecular composition of biogenic secondary organic aerosols using ultrahigh-resolution mass spectrometry: comparing laboratory and field studies

Autor: I. Kourtchev, S. J. Fuller, C. Giorio, R. M. Healy, E. Wilson, I. O'Connor, J. C. Wenger, M. McLeod, J. Aalto, T. M. Ruuskanen, W. Maenhaut, R. Jones, D. S. Venables, J. R. Sodeau, M. Kulmala, M. Kalberer

Publikováno v: Atmospheric Chemistry and Physics, Vol 14, Iss 4, Pp 2155-2167 (2014)

Numerous laboratory experiments have been performed in an attempt to mimic atmospheric secondary organic aerosol (SOA) formation. However, it is still unclear how close the aerosol particles generated in laboratory experiments resemble atmospheric SO

Externí odkaz: https://doaj.org/article/0f5c7fa45db14ce396af745eb47e2fe9

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Akademický článek

Characterization of urban aerosol in Cork city (Ireland) using aerosol mass spectrometry

Autor: M. Dall'Osto, J. Ovadnevaite, D. Ceburnis, D. Martin, R. M. Healy, I. P. O'Connor, I. Kourtchev, J. R. Sodeau, J. C. Wenger, C. O'Dowd

Publikováno v: Atmospheric Chemistry and Physics, Vol 13, Iss 9, Pp 4997-5015 (2013)

Ambient wintertime background urban aerosol in Cork city, Ireland, was characterized using aerosol mass spectrometry. During the three-week measurement study in 2009, 93% of the ca. 1 350 000 single particles characterized by an Aerosol Time-of-Fligh

Externí odkaz: https://doaj.org/article/66138375b58d45bb9fcc73ae153b963d

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Akademický článek

Polar organic marker compounds in atmospheric aerosols during the LBA-SMOCC 2002 biomass burning experiment in Rondônia, Brazil: sources and source processes, time series, diel variations and size distributions

Autor: M. Claeys, I. Kourtchev, V. Pashynska, G. Vas, R. Vermeylen, W. Wang, J. Cafmeyer, X. Chi, P. Artaxo, M. O. Andreae, W. Maenhaut

Publikováno v: Atmospheric Chemistry and Physics, Vol 10, Iss 19, Pp 9319-9331 (2010)

Measurements of polar organic marker compounds were performed on aerosols that were collected at a pasture site in the Amazon basin (Rondônia, Brazil) using a high-volume dichotomous sampler (HVDS) and a Micro-Orifice Uniform Deposit Impactor (MOUDI

Externí odkaz: https://doaj.org/article/f51213c5867b48a6854b37d78ad9c871

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Akademický článek

Source apportionment of PM2.5 in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements

Autor: J. C. Wenger, J. R. Sodeau, D. A. Healy, J. M. Bell, I. P. O'Connor, A. Allanic, I. Kourtchev, S. Hellebust, R. M. Healy

Publikováno v: Atmospheric Chemistry and Physics, Vol 10, Iss 19, Pp 9593-9613 (2010)

An aerosol time-of-flight mass spectrometer (ATOFMS) was deployed for the measurement of the size resolved chemical composition of single particles at a site in Cork Harbour, Ireland for three weeks in August 2008. The ATOFMS was co-located with a su

Externí odkaz: https://doaj.org/article/3f8927e42bd343c482ad17b7492920d8

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