The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies
<p>In a companion article <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx30">Jimenez et al.</a>, <a href="#bib1.bibx30">2020</a>)</span>, we introduced a new lidar method to derive microphysical properties of...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/20/15265/2020/acp-20-15265-2020.pdf |
| _version_ | 1818730691831005184 |
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| author | C. Jimenez A. Ansmann R. Engelmann D. Donovan A. Malinka P. Seifert R. Wiesen M. Radenz Z. Yin Z. Yin Z. Yin J. Bühl J. Schmidt B. Barja U. Wandinger |
| author_facet | C. Jimenez A. Ansmann R. Engelmann D. Donovan A. Malinka P. Seifert R. Wiesen M. Radenz Z. Yin Z. Yin Z. Yin J. Bühl J. Schmidt B. Barja U. Wandinger |
| author_sort | C. Jimenez |
| collection | DOAJ |
| description | <p>In a companion article <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx30">Jimenez et al.</a>, <a href="#bib1.bibx30">2020</a>)</span>, we introduced a new lidar method to derive microphysical properties of liquid-water clouds (cloud extinction coefficient, droplet effective radius, liquid-water content, cloud droplet number concentration <span class="inline-formula"><i>N</i><sub>d</sub></span>) at a height of 50–100 m above the cloud base together with aerosol information (aerosol extinction coefficients, cloud condensation nuclei concentration <span class="inline-formula"><i>N</i><sub>CCN</sub></span>) below the cloud layer so that detailed studies of the influence of given aerosol conditions on the evolution of liquid-water cloud layers with high temporal resolution solely based on lidar observations have become possible now. The novel cloud retrieval technique makes use of lidar observations of the volume linear depolarization ratio at two different receiver field of views (FOVs). In this article, Part 2, the new dual-FOV polarization lidar technique is applied to cloud measurements in pristine marine conditions at Punta Arenas in southern Chile. A multiwavelength polarization Raman lidar, upgraded by integrating a second polarization-sensitive channel to permit depolarization ratio observations at two FOVs, was used for these measurements at the southernmost tip of South America. Two case studies are presented to demonstrate the potential of the new lidar technique. Successful aerosol–cloud-interaction (ACI) studies based on measurements with the upgraded aerosol–cloud lidar in combination with a Doppler lidar of the vertical wind component could be carried out with 1 min temporal resolution at these pristine conditions. In a stratocumulus layer at the top of the convective boundary layer, we found values of <span class="inline-formula"><i>N</i><sub>d</sub></span> and <span class="inline-formula"><i>N</i><sub>CCN</sub></span> (for 0.2 % water supersaturation) ranging from 15–100 and 75–200 cm<span class="inline-formula"><sup>−3</sup></span>, respectively, during updraft periods.
The studies of the aerosol impact on cloud properties yielded ACI values close to 1. The impact of aerosol water uptake on the ACI studies was analyzed with the result that the highest ACI values were obtained when considering aerosol proxies (light-extinction coefficient <span class="inline-formula"><i>α</i><sub>par</sub></span> or <span class="inline-formula"><i>N</i><sub>CCN</sub></span>) measured at heights about 500 m below the cloud base (and thus for dry aerosol conditions).</p> |
| first_indexed | 2024-12-17T23:05:49Z |
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| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-17T23:05:49Z |
| publishDate | 2020-12-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-c025e81b83ed4f3d85dc8d7e880827102022-12-21T21:29:17ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-12-0120152651528410.5194/acp-20-15265-2020The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studiesC. Jimenez0A. Ansmann1R. Engelmann2D. Donovan3A. Malinka4P. Seifert5R. Wiesen6M. Radenz7Z. Yin8Z. Yin9Z. Yin10J. Bühl11J. Schmidt12B. Barja13U. Wandinger14Leibniz Institute for Tropospheric Research, Leipzig, GermanyLeibniz Institute for Tropospheric Research, Leipzig, GermanyLeibniz Institute for Tropospheric Research, Leipzig, GermanyRoyal Netherlands Meteorological Institute (KNMI), De Bilt, the NetherlandsNational Academy of Sciences of Belarus, Minsk, BelarusLeibniz Institute for Tropospheric Research, Leipzig, GermanyLeibniz Institute for Tropospheric Research, Leipzig, GermanyLeibniz Institute for Tropospheric Research, Leipzig, GermanyLeibniz Institute for Tropospheric Research, Leipzig, GermanySchool of Electronic Information, Wuhan University, Wuhan, ChinaKey Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, ChinaLeibniz Institute for Tropospheric Research, Leipzig, GermanyInstitute of Meteorology, University of Leipzig, Leipzig, GermanyAtmospheric Research Laboratory, University of Magallanes, Punta Arenas, ChileLeibniz Institute for Tropospheric Research, Leipzig, Germany<p>In a companion article <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx30">Jimenez et al.</a>, <a href="#bib1.bibx30">2020</a>)</span>, we introduced a new lidar method to derive microphysical properties of liquid-water clouds (cloud extinction coefficient, droplet effective radius, liquid-water content, cloud droplet number concentration <span class="inline-formula"><i>N</i><sub>d</sub></span>) at a height of 50–100 m above the cloud base together with aerosol information (aerosol extinction coefficients, cloud condensation nuclei concentration <span class="inline-formula"><i>N</i><sub>CCN</sub></span>) below the cloud layer so that detailed studies of the influence of given aerosol conditions on the evolution of liquid-water cloud layers with high temporal resolution solely based on lidar observations have become possible now. The novel cloud retrieval technique makes use of lidar observations of the volume linear depolarization ratio at two different receiver field of views (FOVs). In this article, Part 2, the new dual-FOV polarization lidar technique is applied to cloud measurements in pristine marine conditions at Punta Arenas in southern Chile. A multiwavelength polarization Raman lidar, upgraded by integrating a second polarization-sensitive channel to permit depolarization ratio observations at two FOVs, was used for these measurements at the southernmost tip of South America. Two case studies are presented to demonstrate the potential of the new lidar technique. Successful aerosol–cloud-interaction (ACI) studies based on measurements with the upgraded aerosol–cloud lidar in combination with a Doppler lidar of the vertical wind component could be carried out with 1 min temporal resolution at these pristine conditions. In a stratocumulus layer at the top of the convective boundary layer, we found values of <span class="inline-formula"><i>N</i><sub>d</sub></span> and <span class="inline-formula"><i>N</i><sub>CCN</sub></span> (for 0.2 % water supersaturation) ranging from 15–100 and 75–200 cm<span class="inline-formula"><sup>−3</sup></span>, respectively, during updraft periods. The studies of the aerosol impact on cloud properties yielded ACI values close to 1. The impact of aerosol water uptake on the ACI studies was analyzed with the result that the highest ACI values were obtained when considering aerosol proxies (light-extinction coefficient <span class="inline-formula"><i>α</i><sub>par</sub></span> or <span class="inline-formula"><i>N</i><sub>CCN</sub></span>) measured at heights about 500 m below the cloud base (and thus for dry aerosol conditions).</p>https://acp.copernicus.org/articles/20/15265/2020/acp-20-15265-2020.pdf |
| spellingShingle | C. Jimenez A. Ansmann R. Engelmann D. Donovan A. Malinka P. Seifert R. Wiesen M. Radenz Z. Yin Z. Yin Z. Yin J. Bühl J. Schmidt B. Barja U. Wandinger The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies Atmospheric Chemistry and Physics |
| title | The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies |
| title_full | The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies |
| title_fullStr | The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies |
| title_full_unstemmed | The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies |
| title_short | The dual-field-of-view polarization lidar technique: a new concept in monitoring aerosol effects in liquid-water clouds – case studies |
| title_sort | dual field of view polarization lidar technique a new concept in monitoring aerosol effects in liquid water clouds case studies |
| url | https://acp.copernicus.org/articles/20/15265/2020/acp-20-15265-2020.pdf |
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