Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign
The objective of this study is to validate parameterizations that were recently developed for satellite retrievals of cloud condensation nuclei supersaturation spectra, <i>N</i><sub>CCN</sub>(<i>S</i>), at cloud base alongside more traditional parameterizations...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-06-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/17/7365/2017/acp-17-7365-2017.pdf |
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| author | R. C. Braga D. Rosenfeld R. Weigel T. Jurkat M. O. Andreae M. O. Andreae M. Wendisch M. L. Pöhlker T. Klimach U. Pöschl C. Pöhlker C. Voigt C. Voigt C. Mahnke S. Borrmann R. I. Albrecht S. Molleker D. A. Vila L. A. T. Machado P. Artaxo |
| author_facet | R. C. Braga D. Rosenfeld R. Weigel T. Jurkat M. O. Andreae M. O. Andreae M. Wendisch M. L. Pöhlker T. Klimach U. Pöschl C. Pöhlker C. Voigt C. Voigt C. Mahnke S. Borrmann R. I. Albrecht S. Molleker D. A. Vila L. A. T. Machado P. Artaxo |
| author_sort | R. C. Braga |
| collection | DOAJ |
| description | The objective of this study is to validate parameterizations
that were recently developed for satellite retrievals of cloud condensation
nuclei supersaturation spectra, <i>N</i><sub>CCN</sub>(<i>S</i>), at cloud base alongside
more traditional parameterizations connecting <i>N</i><sub>CCN</sub>(<i>S</i>) with cloud base
updrafts and drop concentrations. This was based on the HALO aircraft
measurements during the ACRIDICON–CHUVA campaign over the Amazon region,
which took place in September 2014. The properties of convective clouds were
measured with a cloud combination probe (CCP), a cloud and aerosol
spectrometer (CAS-DPOL), and a CCN counter onboard the HALO aircraft. An
intercomparison of the cloud drop size distributions (DSDs) and the cloud
water content (CWC) derived from the different instruments generally shows
good agreement within the instrumental uncertainties. To this end, the
directly measured cloud drop concentrations (<i>N</i><sub>d</sub>) near cloud base were
compared with inferred values based on the measured cloud base updraft
velocity (<i>W</i><sub>b</sub>) and <i>N</i><sub>CCN</sub>(<i>S</i>) spectra. The measurements of <i>N</i><sub>d</sub> at
cloud base were also compared with drop concentrations (<i>N</i><sub>a</sub>) derived on
the basis of an adiabatic assumption and obtained from the vertical evolution
of cloud drop effective radius (<i>r</i><sub>e</sub>) above cloud base. The measurements
of <i>N</i><sub>CCN</sub>(<i>S</i>) and <i>W</i><sub>b</sub> reproduced the observed <i>N</i><sub>d</sub> within the
measurements uncertainties when the old (1959) Twomey's
parameterization was used. The agreement between the measured and calculated <i>N</i><sub>d</sub> was
only within a factor of 2 with attempts to use cloud base <i>S</i>, as obtained
from the measured <i>W</i><sub>b</sub>, <i>N</i><sub>d</sub>, and <i>N</i><sub>CCN</sub>(<i>S</i>). This underscores the yet
unresolved challenge of aircraft measurements of <i>S</i> in clouds. Importantly,
the vertical evolution of <i>r</i><sub>e</sub> with height reproduced the
observation-based nearly adiabatic cloud base drop concentrations, <i>N</i><sub>a</sub>.
The combination of these results provides aircraft observational support for
the various components of the satellite-retrieved methodology that was
recently developed to retrieve <i>N</i><sub>CCN</sub>(<i>S</i>) under the base of convective
clouds. This parameterization can now be applied with the proper
qualifications to cloud simulations and satellite retrievals. |
| first_indexed | 2024-12-23T20:39:53Z |
| format | Article |
| id | doaj.art-2a62222ecb014fe68bf265ac5470abb2 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-23T20:39:53Z |
| publishDate | 2017-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-2a62222ecb014fe68bf265ac5470abb22022-12-21T17:31:58ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242017-06-01177365738610.5194/acp-17-7365-2017Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaignR. C. Braga0D. Rosenfeld1R. Weigel2T. Jurkat3M. O. Andreae4M. O. Andreae5M. Wendisch6M. L. Pöhlker7T. Klimach8U. Pöschl9C. Pöhlker10C. Voigt11C. Voigt12C. Mahnke13S. Borrmann14R. I. Albrecht15S. Molleker16D. A. Vila17L. A. T. Machado18P. Artaxo19Centro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, BrasilInstitute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, IsraelInstitut für Physik der Atmosphäre, Johannes Gutenberg-Universität, Mainz, GermanyInstitut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyScripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, USALeipziger Institut für Meteorologie (LIM), Universität Leipzig, Stephanstr. 3, 04103 Leipzig, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyInstitut für Physik der Atmosphäre, Johannes Gutenberg-Universität, Mainz, GermanyInstitut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, GermanyInstitut für Physik der Atmosphäre, Johannes Gutenberg-Universität, Mainz, GermanyInstitut für Physik der Atmosphäre, Johannes Gutenberg-Universität, Mainz, GermanyInstituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, BrazilMax Planck Institute for Chemistry (MPI), Particle Chemistry Department, Mainz, GermanyCentro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, BrasilCentro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, BrasilInstituto de Física (IF), Universidade de São Paulo (USP), São Paulo, BrazilThe objective of this study is to validate parameterizations that were recently developed for satellite retrievals of cloud condensation nuclei supersaturation spectra, <i>N</i><sub>CCN</sub>(<i>S</i>), at cloud base alongside more traditional parameterizations connecting <i>N</i><sub>CCN</sub>(<i>S</i>) with cloud base updrafts and drop concentrations. This was based on the HALO aircraft measurements during the ACRIDICON–CHUVA campaign over the Amazon region, which took place in September 2014. The properties of convective clouds were measured with a cloud combination probe (CCP), a cloud and aerosol spectrometer (CAS-DPOL), and a CCN counter onboard the HALO aircraft. An intercomparison of the cloud drop size distributions (DSDs) and the cloud water content (CWC) derived from the different instruments generally shows good agreement within the instrumental uncertainties. To this end, the directly measured cloud drop concentrations (<i>N</i><sub>d</sub>) near cloud base were compared with inferred values based on the measured cloud base updraft velocity (<i>W</i><sub>b</sub>) and <i>N</i><sub>CCN</sub>(<i>S</i>) spectra. The measurements of <i>N</i><sub>d</sub> at cloud base were also compared with drop concentrations (<i>N</i><sub>a</sub>) derived on the basis of an adiabatic assumption and obtained from the vertical evolution of cloud drop effective radius (<i>r</i><sub>e</sub>) above cloud base. The measurements of <i>N</i><sub>CCN</sub>(<i>S</i>) and <i>W</i><sub>b</sub> reproduced the observed <i>N</i><sub>d</sub> within the measurements uncertainties when the old (1959) Twomey's parameterization was used. The agreement between the measured and calculated <i>N</i><sub>d</sub> was only within a factor of 2 with attempts to use cloud base <i>S</i>, as obtained from the measured <i>W</i><sub>b</sub>, <i>N</i><sub>d</sub>, and <i>N</i><sub>CCN</sub>(<i>S</i>). This underscores the yet unresolved challenge of aircraft measurements of <i>S</i> in clouds. Importantly, the vertical evolution of <i>r</i><sub>e</sub> with height reproduced the observation-based nearly adiabatic cloud base drop concentrations, <i>N</i><sub>a</sub>. The combination of these results provides aircraft observational support for the various components of the satellite-retrieved methodology that was recently developed to retrieve <i>N</i><sub>CCN</sub>(<i>S</i>) under the base of convective clouds. This parameterization can now be applied with the proper qualifications to cloud simulations and satellite retrievals.http://www.atmos-chem-phys.net/17/7365/2017/acp-17-7365-2017.pdf |
| spellingShingle | R. C. Braga D. Rosenfeld R. Weigel T. Jurkat M. O. Andreae M. O. Andreae M. Wendisch M. L. Pöhlker T. Klimach U. Pöschl C. Pöhlker C. Voigt C. Voigt C. Mahnke S. Borrmann R. I. Albrecht S. Molleker D. A. Vila L. A. T. Machado P. Artaxo Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign Atmospheric Chemistry and Physics |
| title | Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign |
| title_full | Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign |
| title_fullStr | Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign |
| title_full_unstemmed | Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign |
| title_short | Comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the ACRIDICON–CHUVA campaign |
| title_sort | comparing parameterized versus measured microphysical properties of tropical convective cloud bases during the acridicon chuva campaign |
| url | http://www.atmos-chem-phys.net/17/7365/2017/acp-17-7365-2017.pdf |
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