Polarimetric Radar–Based Investigation of Microphysics in Dendritic and Needle Temperature Aggregation Zones during NASA IMPACTS.
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| Title: | Polarimetric Radar–Based Investigation of Microphysics in Dendritic and Needle Temperature Aggregation Zones during NASA IMPACTS. |
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| Authors: | Zhang, Song1 (AUTHOR) svz5330@psu.edu, Kumjian, Matthew R.1 (AUTHOR), Greybush, Steven J.1 (AUTHOR) |
| Source: | Monthly Weather Review. Oct2025, Vol. 153 Issue 10, p2007-2030. 24p. |
| Subjects: | Microphysics, Winter storms, Precipitation (Chemistry), Ice clouds, Polarimetric remote sensing, United States. National Aeronautics & Space Administration, Meteorological precipitation measurement |
| Abstract: | Microphysical processes that determine cloud particle habits, sizes, and concentrations can be inferred by specific polarimetric radar signatures, providing new perspectives to inform NWP models about hydrometeor types and their distributions in winter storms. In particular, areas of enhanced KDP sometimes occur in regions of aggregates within the dendritic growth zone (DGZ) and needle temperature zone (NTZ). Further, copolar correlation coefficient (CC) reductions are sometimes found in the DGZ. These polarimetric signatures are of interest because they suggest the presence of highly nonspherical particles among the otherwise isotropically scattering aggregates. In this study, in situ observations of cloud particle populations collected during the NASA Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign are used to address debates in the previous literature about these signatures' origins. In the regions of aggregates, cloud particle imager (CPI) cloud particle images show a variety of particle habits that contribute to enhancing KDP or reducing CC, suggesting these polarimetric signatures may result from a combination of different particle types. Particle size, concentration, and aspect ratio data from the two-dimensional stereo (2DS) and high-volume precipitation spectrometer (HVPS) probes determined that the KDP enhancement in the NTZ is produced by ice particles of 0.9–7.0-mm size, along with nonspherical aggregates with a mean aspect ratio < 0.6 at sizes between 4.6 and 20.0 mm. Increased KDP in the DGZ is attributed to ice particles of sizes 0.4–6.0 mm. Additionally, asymmetric particles at sizes 3.0–10.0 mm are evident in the DGZ. The DGZ's CC reduction is attributed to ice particles with sizes 1.4–5.0 mm, while CPI images show a wide range of particle types including irregularly shaped crystals that would scatter anisotropically. Significance Statement: This study determines the diversity of particle sizes, concentrations, and the potential habits that can contribute to observable changes in the polarimetric radar variables in winter storms. Knowledge about these radar signatures may benefit winter weather forecasting through future works on data assimilation. [ABSTRACT FROM AUTHOR] |
| Copyright of Monthly Weather Review 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.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 189052493 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Polarimetric Radar–Based Investigation of Microphysics in Dendritic and Needle Temperature Aggregation Zones during NASA IMPACTS. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Song%22">Zhang, Song</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> svz5330@psu.edu</i><br /><searchLink fieldCode="AR" term="%22Kumjian%2C+Matthew+R%2E%22">Kumjian, Matthew R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Greybush%2C+Steven+J%2E%22">Greybush, Steven J.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Monthly+Weather+Review%22">Monthly Weather Review</searchLink>. Oct2025, Vol. 153 Issue 10, p2007-2030. 24p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Microphysics%22">Microphysics</searchLink><br /><searchLink fieldCode="DE" term="%22Winter+storms%22">Winter storms</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+clouds%22">Ice clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Polarimetric+remote+sensing%22">Polarimetric remote sensing</searchLink><br /><searchLink fieldCode="DE" term="%22United+States%2E+National+Aeronautics+%26+Space+Administration%22">United States. National Aeronautics & Space Administration</searchLink><br /><searchLink fieldCode="DE" term="%22Meteorological+precipitation+measurement%22">Meteorological precipitation measurement</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Microphysical processes that determine cloud particle habits, sizes, and concentrations can be inferred by specific polarimetric radar signatures, providing new perspectives to inform NWP models about hydrometeor types and their distributions in winter storms. In particular, areas of enhanced KDP sometimes occur in regions of aggregates within the dendritic growth zone (DGZ) and needle temperature zone (NTZ). Further, copolar correlation coefficient (CC) reductions are sometimes found in the DGZ. These polarimetric signatures are of interest because they suggest the presence of highly nonspherical particles among the otherwise isotropically scattering aggregates. In this study, in situ observations of cloud particle populations collected during the NASA Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign are used to address debates in the previous literature about these signatures' origins. In the regions of aggregates, cloud particle imager (CPI) cloud particle images show a variety of particle habits that contribute to enhancing KDP or reducing CC, suggesting these polarimetric signatures may result from a combination of different particle types. Particle size, concentration, and aspect ratio data from the two-dimensional stereo (2DS) and high-volume precipitation spectrometer (HVPS) probes determined that the KDP enhancement in the NTZ is produced by ice particles of 0.9–7.0-mm size, along with nonspherical aggregates with a mean aspect ratio < 0.6 at sizes between 4.6 and 20.0 mm. Increased KDP in the DGZ is attributed to ice particles of sizes 0.4–6.0 mm. Additionally, asymmetric particles at sizes 3.0–10.0 mm are evident in the DGZ. The DGZ's CC reduction is attributed to ice particles with sizes 1.4–5.0 mm, while CPI images show a wide range of particle types including irregularly shaped crystals that would scatter anisotropically. Significance Statement: This study determines the diversity of particle sizes, concentrations, and the potential habits that can contribute to observable changes in the polarimetric radar variables in winter storms. Knowledge about these radar signatures may benefit winter weather forecasting through future works on data assimilation. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Monthly Weather Review 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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1175/MWR-D-24-0232.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 2007 Subjects: – SubjectFull: Microphysics Type: general – SubjectFull: Winter storms Type: general – SubjectFull: Precipitation (Chemistry) Type: general – SubjectFull: Ice clouds Type: general – SubjectFull: Polarimetric remote sensing Type: general – SubjectFull: United States. National Aeronautics & Space Administration Type: general – SubjectFull: Meteorological precipitation measurement Type: general Titles: – TitleFull: Polarimetric Radar–Based Investigation of Microphysics in Dendritic and Needle Temperature Aggregation Zones during NASA IMPACTS. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Song – PersonEntity: Name: NameFull: Kumjian, Matthew R. – PersonEntity: Name: NameFull: Greybush, Steven J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00270644 Numbering: – Type: volume Value: 153 – Type: issue Value: 10 Titles: – TitleFull: Monthly Weather Review Type: main |
| ResultId | 1 |
