AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols
<p>This study introduces AerSett v1.0 (AERosol SETTling version 1.0), a model giving the settling speed of big spherical aerosols in the atmosphere without going through an iterative equation resolution. We prove that, for all spherical atmospheric aerosols with diameter <span class="i...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-02-01
|
| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/16/1119/2023/gmd-16-1119-2023.pdf |
| _version_ | 1797924675188162560 |
|---|---|
| author | S. Mailler S. Mailler L. Menut A. Cholakian R. Pennel |
| author_facet | S. Mailler S. Mailler L. Menut A. Cholakian R. Pennel |
| author_sort | S. Mailler |
| collection | DOAJ |
| description | <p>This study introduces AerSett v1.0 (AERosol SETTling version 1.0), a model giving the settling speed of big spherical aerosols in the atmosphere without going through an iterative equation resolution. We prove that, for all spherical atmospheric aerosols with diameter <span class="inline-formula"><i>D</i></span> up to <span class="inline-formula">1000 µm</span>, this direct and explicit method including the drag coefficient formulation of <span class="cit" id="xref_text.1"><a href="#bib1.bibx5">Clift and Gauvin</a> (<a href="#bib1.bibx5">1971</a>)</span> and the <span class="cit" id="xref_text.2"><a href="#bib1.bibx7">Davies</a> (<a href="#bib1.bibx7">1945</a>)</span> slip correction factor gives results within 2 % of the exact solution obtained from the numerical resolution of a non-linear fixed-point equation. This error is acceptable considering the uncertainties on the drag coefficient formulations themselves. For <span class="inline-formula"><i>D</i><100 µm</span>, the error is below 0.5 %. We provide a Fortran implementation of this simple and straightforward model, hoping that more chemistry–transport models (CTMs) and general circulation models will be able to take into account large-particle drag correction to the settling speed of big spherical aerosol particles in the atmosphere, without performing an iterative and time-consuming calculation.</p> |
| first_indexed | 2024-04-10T15:04:39Z |
| format | Article |
| id | doaj.art-d9f587fd89604aa3a7c9be7a0ff26794 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-04-10T15:04:39Z |
| publishDate | 2023-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-d9f587fd89604aa3a7c9be7a0ff267942023-02-15T07:46:11ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032023-02-01161119112710.5194/gmd-16-1119-2023AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosolsS. Mailler0S. Mailler1L. Menut2A. Cholakian3R. Pennel4LMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Research University, Sorbonne Université, CNRS, Palaiseau, FranceÉcole des Ponts ParisTech, Marne-la-Vallée, FranceLMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Research University, Sorbonne Université, CNRS, Palaiseau, FranceLMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Research University, Sorbonne Université, CNRS, Palaiseau, FranceLMD/IPSL, École Polytechnique, Institut Polytechnique de Paris, ENS, PSL Research University, Sorbonne Université, CNRS, Palaiseau, France<p>This study introduces AerSett v1.0 (AERosol SETTling version 1.0), a model giving the settling speed of big spherical aerosols in the atmosphere without going through an iterative equation resolution. We prove that, for all spherical atmospheric aerosols with diameter <span class="inline-formula"><i>D</i></span> up to <span class="inline-formula">1000 µm</span>, this direct and explicit method including the drag coefficient formulation of <span class="cit" id="xref_text.1"><a href="#bib1.bibx5">Clift and Gauvin</a> (<a href="#bib1.bibx5">1971</a>)</span> and the <span class="cit" id="xref_text.2"><a href="#bib1.bibx7">Davies</a> (<a href="#bib1.bibx7">1945</a>)</span> slip correction factor gives results within 2 % of the exact solution obtained from the numerical resolution of a non-linear fixed-point equation. This error is acceptable considering the uncertainties on the drag coefficient formulations themselves. For <span class="inline-formula"><i>D</i><100 µm</span>, the error is below 0.5 %. We provide a Fortran implementation of this simple and straightforward model, hoping that more chemistry–transport models (CTMs) and general circulation models will be able to take into account large-particle drag correction to the settling speed of big spherical aerosol particles in the atmosphere, without performing an iterative and time-consuming calculation.</p>https://gmd.copernicus.org/articles/16/1119/2023/gmd-16-1119-2023.pdf |
| spellingShingle | S. Mailler S. Mailler L. Menut A. Cholakian R. Pennel AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols Geoscientific Model Development |
| title | AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| title_full | AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| title_fullStr | AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| title_full_unstemmed | AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| title_short | AerSett v1.0: a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| title_sort | aersett v1 0 a simple and straightforward model for the settling speed of big spherical atmospheric aerosols |
| url | https://gmd.copernicus.org/articles/16/1119/2023/gmd-16-1119-2023.pdf |
| work_keys_str_mv | AT smailler aersettv10asimpleandstraightforwardmodelforthesettlingspeedofbigsphericalatmosphericaerosols AT smailler aersettv10asimpleandstraightforwardmodelforthesettlingspeedofbigsphericalatmosphericaerosols AT lmenut aersettv10asimpleandstraightforwardmodelforthesettlingspeedofbigsphericalatmosphericaerosols AT acholakian aersettv10asimpleandstraightforwardmodelforthesettlingspeedofbigsphericalatmosphericaerosols AT rpennel aersettv10asimpleandstraightforwardmodelforthesettlingspeedofbigsphericalatmosphericaerosols |