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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ftcopernicus:oai:publications.copernicus.org:acp107737 2023-07-30T04:01:24+02:00 Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site Donateo, Antonio Pappaccogli, Gianluca Famulari, Daniela Mazzola, Mauro Scoto, Federico Decesari, Stefano 2023-07-06 application/pdf https://doi.org/10.5194/acp-23-7425-2023 https://acp.copernicus.org/articles/23/7425/2023/ eng eng doi:10.5194/acp-23-7425-2023 https://acp.copernicus.org/articles/23/7425/2023/ eISSN: 1680-7324 Text 2023 ftcopernicus https://doi.org/10.5194/acp-23-7425-2023 2023-07-10T16:24:17Z 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 ... Text Arctic Ny Ålesund Ny-Ålesund Svalbard Tundra Copernicus Publications: E-Journals Arctic Ny-Ålesund Svalbard Atmospheric Chemistry and Physics 23 13 7425 7445 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
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 |
Text |
author |
Donateo, Antonio Pappaccogli, Gianluca Famulari, Daniela Mazzola, Mauro Scoto, Federico Decesari, Stefano |
spellingShingle |
Donateo, Antonio Pappaccogli, Gianluca Famulari, Daniela Mazzola, Mauro Scoto, Federico Decesari, Stefano Characterization of size-segregated particles' turbulent flux and deposition velocity by eddy correlation method at an Arctic site |
author_facet |
Donateo, Antonio Pappaccogli, Gianluca Famulari, Daniela Mazzola, Mauro Scoto, Federico Decesari, Stefano |
author_sort |
Donateo, Antonio |
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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-7425-2023 https://acp.copernicus.org/articles/23/7425/2023/ |
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 |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-23-7425-2023 https://acp.copernicus.org/articles/23/7425/2023/ |
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 |
_version_ |
1772812140754763776 |