Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site
Estimating aerosol depositions on snow and ice surfaces and assessing the aerosol lifecycle in the Arctic region is challenged by the scarce measurement data available for particle surface fluxes. This work aims at assessing the deposition velocity of atmospheric particles at an Arctic site (Ny-Åles...
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Copernicus Publications
2023
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ftdoajarticles:oai:doaj.org/article:ec9c7535c495413188a2a15081ec4ccf 2023-07-30T04:01:25+02:00 Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site A. Donateo G. Pappaccogli D. Famulari M. Mazzola F. Scoto S. Decesari 2023-07-01T00:00:00Z https://doi.org/10.5194/acp-23-7425-2023 https://doaj.org/article/ec9c7535c495413188a2a15081ec4ccf EN eng Copernicus Publications https://acp.copernicus.org/articles/23/7425/2023/acp-23-7425-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-7425-2023 1680-7316 1680-7324 https://doaj.org/article/ec9c7535c495413188a2a15081ec4ccf Atmospheric Chemistry and Physics, Vol 23, Pp 7425-7445 (2023) Physics QC1-999 Chemistry QD1-999 article 2023 ftdoajarticles https://doi.org/10.5194/acp-23-7425-2023 2023-07-09T00:34:17Z Estimating aerosol depositions on snow and ice surfaces and assessing the aerosol lifecycle in the Arctic region is challenged by the scarce measurement data available for particle surface fluxes. This work aims at assessing the deposition velocity of atmospheric particles at an Arctic site (Ny-Ålesund, Svalbard islands) over snow, during the melting season, and over dry tundra. The measurements were performed using the eddy covariance method from March to August 2021. The measurement system was based on a condensation particle counter (CPC) for ultrafine particle (UFP; < 0.25 µm ) fluxes and an optical particle counter (OPC) for evaluating particle size fluxes in the accumulation mode (ACC; 0.25 < d p < 0.7 µm ) and quasi-coarse mode (CRS; 0.8 < d p < 3 µm ). Turbulent fluxes in the ultrafine particle size range were prevalently downward, especially in summertime. In contrast, particle fluxes in the accumulation and quasi-coarse mode were more frequently positive, especially during the colder months, pointing to surface sources of particles from, for example, sea spray, snow sublimation, or local pollution. The overall median deposition velocity ( V d + <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="16pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="417e8318f5b9549c1b1d966738709931"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-23-7425-2023-ie00001.svg" width="16pt" height="15pt" src="acp-23-7425-2023-ie00001.png"/></svg:svg> ) values were 0.90, 0.62, and 4.42 mm s −1 for UFP, ACC, and CRS, respectively. Deposition velocities were smaller, on average, over the snowpack, with median values of 0.73, 0.42, and 3.50 mm s −1 . The observed velocities differ by less than 50 % with respect to the previous literature in analogous environments (i.e. ice/snow) for particles in the size range 0.01–1 µm . At the same time, an agreement with the results of predictive models was found for only a few parameterizations, in particular with Slinn ... Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Svalbard Tundra Directory of Open Access Journals: DOAJ Articles Arctic Ny-Ålesund Svalbard Atmospheric Chemistry and Physics 23 13 7425 7445 |
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Directory of Open Access Journals: DOAJ Articles |
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topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 A. Donateo G. Pappaccogli D. Famulari M. Mazzola F. Scoto S. Decesari Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Estimating aerosol depositions on snow and ice surfaces and assessing the aerosol lifecycle in the Arctic region is challenged by the scarce measurement data available for particle surface fluxes. This work aims at assessing the deposition velocity of atmospheric particles at an Arctic site (Ny-Ålesund, Svalbard islands) over snow, during the melting season, and over dry tundra. The measurements were performed using the eddy covariance method from March to August 2021. The measurement system was based on a condensation particle counter (CPC) for ultrafine particle (UFP; < 0.25 µm ) fluxes and an optical particle counter (OPC) for evaluating particle size fluxes in the accumulation mode (ACC; 0.25 < d p < 0.7 µm ) and quasi-coarse mode (CRS; 0.8 < d p < 3 µm ). Turbulent fluxes in the ultrafine particle size range were prevalently downward, especially in summertime. In contrast, particle fluxes in the accumulation and quasi-coarse mode were more frequently positive, especially during the colder months, pointing to surface sources of particles from, for example, sea spray, snow sublimation, or local pollution. The overall median deposition velocity ( V d + <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="16pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="417e8318f5b9549c1b1d966738709931"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-23-7425-2023-ie00001.svg" width="16pt" height="15pt" src="acp-23-7425-2023-ie00001.png"/></svg:svg> ) values were 0.90, 0.62, and 4.42 mm s −1 for UFP, ACC, and CRS, respectively. Deposition velocities were smaller, on average, over the snowpack, with median values of 0.73, 0.42, and 3.50 mm s −1 . The observed velocities differ by less than 50 % with respect to the previous literature in analogous environments (i.e. ice/snow) for particles in the size range 0.01–1 µm . At the same time, an agreement with the results of predictive models was found for only a few parameterizations, in particular with Slinn ... |
format |
Article in Journal/Newspaper |
author |
A. Donateo G. Pappaccogli D. Famulari M. Mazzola F. Scoto S. Decesari |
author_facet |
A. Donateo G. Pappaccogli D. Famulari M. Mazzola F. Scoto S. Decesari |
author_sort |
A. Donateo |
title |
Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
title_short |
Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
title_full |
Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
title_fullStr |
Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
title_full_unstemmed |
Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
title_sort |
characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an arctic site |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-7425-2023 https://doaj.org/article/ec9c7535c495413188a2a15081ec4ccf |
geographic |
Arctic Ny-Ålesund Svalbard |
geographic_facet |
Arctic Ny-Ålesund Svalbard |
genre |
Arctic Ny Ålesund Ny-Ålesund Svalbard Tundra |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Svalbard Tundra |
op_source |
Atmospheric Chemistry and Physics, Vol 23, Pp 7425-7445 (2023) |
op_relation |
https://acp.copernicus.org/articles/23/7425/2023/acp-23-7425-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-7425-2023 1680-7316 1680-7324 https://doaj.org/article/ec9c7535c495413188a2a15081ec4ccf |
op_doi |
https://doi.org/10.5194/acp-23-7425-2023 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
23 |
container_issue |
13 |
container_start_page |
7425 |
op_container_end_page |
7445 |
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1772812166322192384 |