Dominant Ice Cloud Microphysics Characterized by Simultaneous Observations of Radar Reflectivity and Doppler Velocity.
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| Title: | Dominant Ice Cloud Microphysics Characterized by Simultaneous Observations of Radar Reflectivity and Doppler Velocity. |
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| Authors: | Seiki, Tatsuya1 (AUTHOR) tseiki@jamstec.go.jp, Horie, Hiroaki2 (AUTHOR), Hagihara, Yuichiro2 (AUTHOR), Noda, Akira T.1 (AUTHOR) |
| Source: | Journal of the Atmospheric Sciences. Dec2025, Vol. 82 Issue 12, p2677-2692. 16p. |
| Subjects: | Cirrus clouds, Ice clouds, Extreme weather, Satellite-based remote sensing, Doppler effect, Cloud physics, Climate change, Reflectance measurement |
| Abstract: | This study proposes a novel process-oriented analysis method using a joint probability density function of the equivalent radar reflectivity factor (Ze) and Doppler velocity (υd) on a common logarithmic scale (Ze–log10υd diagram) to characterize dominant microphysical processes in cirrus clouds. The method focuses on the linear relationship between Ze and the ice terminal velocity (υt) on a common logarithmic scale due to their physical definition. Assuming υt ≈ υd in nonconvective clouds, the ratio of changes in Ze to changes in log10υd, denoted as the slope (ΔZe/Δlog10υd), is found to be explained by microphysical properties. Consequently, the principal component of the Ze–log10υd diagram, sampled within a cloud layer, represents the slope in the cloud. This representative slope serves as a quantitative index to characterize key cloud microphysical processes within the cloud. In cirrus clouds, the slope is shown to be sensitive to the microphysical balance between aggregation and vapor deposition, supported by cloud microphysics theory. Ground-based radar observations reveal that the representative slope generally increases with atmospheric temperature, reflecting shifts in dominant microphysical processes. Furthermore, to elucidate differences in the representative slope, sensitivity experiments with a high-resolution climate model are performed using numerical simulations. These numerical experiments demonstrate that overestimated aggregation or suppressed vapor deposition each reduces the representative slope in distinct ways, as expected. The proposed method provides new insights into the cloud microphysics governing high clouds. Significance Statement: In May 2024, a new Earth observation satellite named EarthCARE was launched, providing the first-ever global Doppler velocity data. To effectively utilize the long-term data from the EarthCARE satellite, this study proposes a new analysis method based on ground-based radar observations, designed to validate the satellite's data and interpret cloud processes more precisely. This method aims to help reveal how ice particles grow and evolve inside high-altitude clouds. With long-term data from EarthCARE, this approach has the potential to significantly reduce uncertainties in climate change projections and improve the prediction of extreme weather events, such as tropical cyclones. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 190575922 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dominant Ice Cloud Microphysics Characterized by Simultaneous Observations of Radar Reflectivity and Doppler Velocity. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Seiki%2C+Tatsuya%22">Seiki, Tatsuya</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tseiki@jamstec.go.jp</i><br /><searchLink fieldCode="AR" term="%22Horie%2C+Hiroaki%22">Horie, Hiroaki</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hagihara%2C+Yuichiro%22">Hagihara, Yuichiro</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Noda%2C+Akira+T%2E%22">Noda, Akira T.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+the+Atmospheric+Sciences%22">Journal of the Atmospheric Sciences</searchLink>. Dec2025, Vol. 82 Issue 12, p2677-2692. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cirrus+clouds%22">Cirrus clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+clouds%22">Ice clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Extreme+weather%22">Extreme weather</searchLink><br /><searchLink fieldCode="DE" term="%22Satellite-based+remote+sensing%22">Satellite-based remote sensing</searchLink><br /><searchLink fieldCode="DE" term="%22Doppler+effect%22">Doppler effect</searchLink><br /><searchLink fieldCode="DE" term="%22Cloud+physics%22">Cloud physics</searchLink><br /><searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance+measurement%22">Reflectance measurement</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study proposes a novel process-oriented analysis method using a joint probability density function of the equivalent radar reflectivity factor (Ze) and Doppler velocity (υd) on a common logarithmic scale (Ze–log10υd diagram) to characterize dominant microphysical processes in cirrus clouds. The method focuses on the linear relationship between Ze and the ice terminal velocity (υt) on a common logarithmic scale due to their physical definition. Assuming υt ≈ υd in nonconvective clouds, the ratio of changes in Ze to changes in log10υd, denoted as the slope (ΔZe/Δlog10υd), is found to be explained by microphysical properties. Consequently, the principal component of the Ze–log10υd diagram, sampled within a cloud layer, represents the slope in the cloud. This representative slope serves as a quantitative index to characterize key cloud microphysical processes within the cloud. In cirrus clouds, the slope is shown to be sensitive to the microphysical balance between aggregation and vapor deposition, supported by cloud microphysics theory. Ground-based radar observations reveal that the representative slope generally increases with atmospheric temperature, reflecting shifts in dominant microphysical processes. Furthermore, to elucidate differences in the representative slope, sensitivity experiments with a high-resolution climate model are performed using numerical simulations. These numerical experiments demonstrate that overestimated aggregation or suppressed vapor deposition each reduces the representative slope in distinct ways, as expected. The proposed method provides new insights into the cloud microphysics governing high clouds. Significance Statement: In May 2024, a new Earth observation satellite named EarthCARE was launched, providing the first-ever global Doppler velocity data. To effectively utilize the long-term data from the EarthCARE satellite, this study proposes a new analysis method based on ground-based radar observations, designed to validate the satellite's data and interpret cloud processes more precisely. This method aims to help reveal how ice particles grow and evolve inside high-altitude clouds. With long-term data from EarthCARE, this approach has the potential to significantly reduce uncertainties in climate change projections and improve the prediction of extreme weather events, such as tropical cyclones. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=190575922 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1175/JAS-D-25-0051.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 2677 Subjects: – SubjectFull: Cirrus clouds Type: general – SubjectFull: Ice clouds Type: general – SubjectFull: Extreme weather Type: general – SubjectFull: Satellite-based remote sensing Type: general – SubjectFull: Doppler effect Type: general – SubjectFull: Cloud physics Type: general – SubjectFull: Climate change Type: general – SubjectFull: Reflectance measurement Type: general Titles: – TitleFull: Dominant Ice Cloud Microphysics Characterized by Simultaneous Observations of Radar Reflectivity and Doppler Velocity. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Seiki, Tatsuya – PersonEntity: Name: NameFull: Horie, Hiroaki – PersonEntity: Name: NameFull: Hagihara, Yuichiro – PersonEntity: Name: NameFull: Noda, Akira T. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00224928 Numbering: – Type: volume Value: 82 – Type: issue Value: 12 Titles: – TitleFull: Journal of the Atmospheric Sciences Type: main |
| ResultId | 1 |
