Intercomparison of holographic imaging and single-particle forward light scattering in situ measurements of liquid clouds in changing atmospheric conditions

Tiitta, Petri; Leskinen, Ari; Kaikkonen, Ville A.; Molkoselkä, Eero O.; Mäkynen, Anssi; Joutsensaari, Jorma; Calderón, Silvia M.; Romakkaniemi, Sami; Komppula, Mika

doi:10.5194/amt-15-2993-2022

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…Wind direction and wind speed also cause different droplets loss efficiency. Tiitta et al [35] found that the bigger the angular deviation from the coaxial structure, the greater the droplets loss. The average wind speed on the mountain station is 10 m/s, and the wind direction is variable.…”

Section: The Analysis Of Reasons Causing the Differencementioning

confidence: 99%

“…Methods for in situ measurement include light scattering and holographic imaging. The measurement methods based on light scattering exploit the intensity of forward scattered light from individual droplets to determine the size of droplets [35]. Instruments based on the method are, for example, the fog monitor 100 (FM100) and the fog monitor 120 (FM120).…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Investigation of Light Scattering and Digital Holographic Imaging to Measure Liquid Phase Cloud Droplets

Zhang,

Wang,

Yang

et al. 2023

Atmosphere

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The measurement of cloud microphysical parameters plays an important role in describing characteristics of liquid phase clouds and investigating mutual relationships between clouds and precipitation. In this paper, cloud microphysical parameters at Liupan Mountain Weather Station in Ningxia are measured with a high-resolution coaxial digital holographic imager and a fog monitor 120. There are differences in the measurement results between the two instruments. The number concentration measured by the digital holographic imager is about 1.5 times that of the fog monitor 120. However, their Pearson correlation coefficient is above 0.9. Through analysis, we found that the measurement results of the digital holographic imager and fog monitor 120 are differences in 2–4 µm and 7–50µm. For the droplets with the diameters of 4–7 µm, their measurement results have good consistency. By analyzing the influence of wind field and detection sensitivity on the measurement principle, the reasons which caused the difference are proposed. Advice is given to observe topographic clouds by using the above two instruments. In addition, the differences in liquid water content and visibility are analyzed due to the absence of small and large droplets. The study provides data support for improving the accuracy of instruments in measuring cloud droplets and is useful for research in the field of cloud microphysical processes.

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Section: The Analysis Of Reasons Causing the Differencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparative Investigation of Light Scattering and Digital Holographic Imaging to Measure Liquid Phase Cloud Droplets

Zhang,

Wang,

Yang

et al. 2023

Atmosphere

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Atmospheric icing meteorological parameter study using field experiments and simulation

Han,

Virk,

Asif

et al. 2024

Meteorological Applications

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Atmospheric icing on ground structures is a concern from design, operation, and safety perspectives. Supercooled water droplets size and liquid water content (LWC) are important weather parameters to better understand the ice accretion physics on ground structures. Most existing studies are based on measurements at high altitude. The study is based on the field results of a specific event (from 9:30 to 22:27 h on October 29, 2022) in Arctic region of northern Norway. The data from this event are presented and used for analytical validation and simulation. Field measurements of different meteorological weather parameters including the droplet size and LWC are carried out leading to recording of resultant atmospheric ice load and intensity. A comprehensive study is also carried out to validate droplet collision efficiency and ice load using the existing analytical model ISO‐12494 and computational fluid dynamics (CFD)–based numerical simulations. Furthermore, the differences in icing simulation using parameters such as median volume diameter (MVD), Langmuir B –J as alternatives to the actual droplet size distribution (DSD) spectrum are also analyzed. The results show that under natural meteorological conditions, the characteristics of water DSD change in real time. Using MVD alone to calculate the water droplet collision efficiency on circular cylinders can lead to significant errors. Accurately selecting the Langmuir distribution as a substitute for the actual DSD can reduce simulation errors to within 5%. Compared to the analytical model, the numerical simulations result better reflects the collision characteristics of water droplets of different sizes on the cylindrical object.

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In-situ measurements of fog microphysics: Visibility parameterization and estimation of fog droplet sedimentation velocity

Nelli,

Francis,

Abida

et al. 2024

Atmospheric Research

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Intercomparison of holographic imaging and single-particle forward light scattering in situ measurements of liquid clouds in changing atmospheric conditions

Cited by 8 publications

References 45 publications

A Comparative Investigation of Light Scattering and Digital Holographic Imaging to Measure Liquid Phase Cloud Droplets

A Comparative Investigation of Light Scattering and Digital Holographic Imaging to Measure Liquid Phase Cloud Droplets

Atmospheric icing meteorological parameter study using field experiments and simulation

In-situ measurements of fog microphysics: Visibility parameterization and estimation of fog droplet sedimentation velocity

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