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DOI | 10.5194/acp-19-13989-2019 |
Aerosol-cloud closure study on cloud optical properties using remotely piloted aircraft measurements during a BACCHUS field campaign in Cyprus | |
Calmer R.; Roberts G.C.; Sanchez K.J.; Sciare J.; Sellegri K.; Picard D.; Vrekoussis M.; Pikridas M. | |
发表日期 | 2019 |
ISSN | 16807316 |
起始页码 | 13989 |
结束页码 | 14007 |
卷号 | 19期号:22 |
英文摘要 | In the framework of the EU-FP7 BACCHUS (impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: Towards a Holistic UnderStanding) project, an intensive field campaign was performed in Cyprus (March 2015). Remotely piloted aircraft system (RPAS), ground-based instruments, and remote-sensing observations were operating in parallel to provide an integrated characterization of aerosol-cloud interactions. Remotely piloted aircraft (RPA) were equipped with a five-hole probe, pyranometers, pressure, temperature and humidity sensors, and measured vertical wind at cloud base and cloud optical properties of a stratocumulus layer. Ground-based measurements of dry aerosol size distributions and cloud condensation nuclei spectra, and RPA observations of updraft and meteorological state parameters are used here to initialize an aerosol-cloud parcel model (ACPM) and compare the in situ observations of cloud optical properties measured by the RPA to those simulated in the ACPM. Two different cases are studied with the ACPM, including an adiabatic case and an entrainment case, in which the in-cloud temperature profile from RPA is taken into account. Adiabatic ACPM simulation yields cloud droplet number concentrations at cloud base (approximately 400 cm-3) that are similar to those derived from a Hoppel minimum analysis. Cloud optical properties have been inferred using the transmitted fraction of shortwave radiation profile measured by downwelling and upwelling pyranometers mounted on a RPA, and the observed transmitted fraction of solar radiation is then compared to simulations from the ACPM. ACPM simulations and RPA observations shows better agreement when associated with entrainment compared to that of an adiabatic case. The mean difference between observed and adiabatic profiles of transmitted fraction of solar radiation is 0.12, while this difference is only 0.03 between observed and entrainment profiles. A sensitivity calculation is then conducted to quantify the relative impacts of 2-fold changes in aerosol concentration, and updraft to highlight the importance of accounting for the impact of entrainment in deriving cloud optical properties, as well as the ability of RPAs to leverage ground-based observations for studying aerosol-cloud interactions. . © 2019 American Institute of Physics Inc.. All rights reserved. |
语种 | 英语 |
scopus关键词 | aerosol; airborne survey; cloud condensation nucleus; ground-based measurement; integrated approach; optical property; particle size; remote sensing; size distribution; stratocumulus; updraft; Cyprus |
来源期刊 | Atmospheric Chemistry and Physics
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/144030 |
作者单位 | Centre National de Recherches Météorologiques (CNRM), UMR 3589, Météo-France/CNRS, Toulouse, France; Scripps Institution of Oceanography, University of California, San Diego, CA, United States; Energy Environment and Water Research Center, Cyprus Institute, Nicosia, 2121, Cyprus; LaMP, Laboratoire de Météorologie Physique CNRS UMR6016, Université Clermont Auvergne, Aubière, France; Institute of Environmental Physics and Remote Sensing (IUP-UB), University of Bremen, Bremen, 28359, Germany; Center of Marine Environmental Sciences (MARUM), University of Bremen, Bremen, 28359, Germany; NASA Postdoctoral Program Fellow, NASA Langley Research Center, Hampton, VA, United States |
推荐引用方式 GB/T 7714 | Calmer R.,Roberts G.C.,Sanchez K.J.,et al. Aerosol-cloud closure study on cloud optical properties using remotely piloted aircraft measurements during a BACCHUS field campaign in Cyprus[J],2019,19(22). |
APA | Calmer R..,Roberts G.C..,Sanchez K.J..,Sciare J..,Sellegri K..,...&Pikridas M..(2019).Aerosol-cloud closure study on cloud optical properties using remotely piloted aircraft measurements during a BACCHUS field campaign in Cyprus.Atmospheric Chemistry and Physics,19(22). |
MLA | Calmer R.,et al."Aerosol-cloud closure study on cloud optical properties using remotely piloted aircraft measurements during a BACCHUS field campaign in Cyprus".Atmospheric Chemistry and Physics 19.22(2019). |
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