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| projects:pomodori [2026/09/12 20:21] – ayush | projects:pomodori [2026/09/12 20:23] (current) – ayush |
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| Currently, we are moving toward C-band radar data and analyze the potential for identifying and estimating riming from these weather radar measurements at longer wavelengths. | Currently, we are moving toward C-band radar data and analyze the potential for identifying and estimating riming from these weather radar measurements at longer wavelengths. |
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| <WRAP tablewidth 60% center>**Figure 1**: Selected examples of riming events. The upper part of each panel shows Dopplervelocity, the lower part the retrieved rime mass fraction. Hatched areas are excluded due to a high convection index. Events are indicated by a green overlay. The number of samples per event is depicted by the green number.</WRAP> \\ | title="Figure 1" |
| | caption="Selected examples of riming events. The upper part of each panel shows Dopplervelocity, the lower part the retrieved rime mass fraction. Hatched areas are excluded due to a high convection index. Events are indicated by a green overlay. The number of samples per event is depicted by the green number." |
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| For riming events identified by the LMU project partners based on Ka-band cloud radars, the DWD researchers have analyzed concurrent polarimetric measurements from the operational scanning C-band weather radars to see whether a typical riming signature can also be observed in the C-band polarimetric data recorded above the cloud radars. Figure 2 shows an example where such a riming signature is indeed evident in the C-band radar volume-scan data: elevated radar reflectivity, differential reflectivity close to 0, and a very high correlation coefficient approaching a value of 1. However, other riming events identified in Ka-band cloud radar data do not show any clear signature in the corresponding polarimetric C-band radar measurements. \\ \\ | For riming events identified by the LMU project partners based on Ka-band cloud radars, the DWD researchers have analyzed concurrent polarimetric measurements from the operational scanning C-band weather radars to see whether a typical riming signature can also be observed in the C-band polarimetric data recorded above the cloud radars. Figure 2 shows an example where such a riming signature is indeed evident in the C-band radar volume-scan data: elevated radar reflectivity, differential reflectivity close to 0, and a very high correlation coefficient approaching a value of 1. However, other riming events identified in Ka-band cloud radar data do not show any clear signature in the corresponding polarimetric C-band radar measurements. \\ \\ |
| Additionally, DWD continues to explore the new birdbath scan (developed as part of PROM phase 1 and implemented in DWD's operational radar scanning cycle; see Gergely et al. 2022) in the context of analyzing convective storms and, particularly, for estimating hail characteristics relevant to assessing the damage potential of these thunderstorms. | Additionally, DWD continues to explore the new birdbath scan (developed as part of PROM phase 1 and implemented in DWD's operational radar scanning cycle; see Gergely et al. 2022) in the context of analyzing convective storms and, particularly, for estimating hail characteristics relevant to assessing the damage potential of these thunderstorms. |
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| <WRAP tablewidth 60% center>**Figure 2**: PPI of Essen C-band radar at 2.5° elevation in October 2021, recorded when a significant riming event was identified based on the vertically pointing Ka-band cloud radar at Jülich. Here, a characteristic riming signature can also be observed in the polarimetric radar data above the cloud radar site.</WRAP> \\ | title="Figure 2" |
| | caption="PPI of Essen C-band radar at 2.5° elevation in October 2021, recorded when a significant riming event was identified based on the vertically pointing Ka-band cloud radar at Jülich. Here, a characteristic riming signature can also be observed in the polarimetric radar data above the cloud radar site." |
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| PROM-POMODORI partners have presented these results at the 2022 North American Hail Workshop, at the AMS Conference on Radar Meteorology 2023, and at the International Summer Snowfall Workshop 2023. | PROM-POMODORI partners have presented these results at the 2022 North American Hail Workshop, at the AMS Conference on Radar Meteorology 2023, and at the International Summer Snowfall Workshop 2023. |