External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime
Abstract Recent observations of the trade‐wind regions highlight the covariability between cold‐pool properties and mesoscale cloud organization. Given the covariability of organization with cloud cover and albedo, this suggests a potential impact of cold pools on the cloud radiative effect (CRE). T...
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American Geophysical Union (AGU)
2025-01-01
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| Series: | Journal of Advances in Modeling Earth Systems |
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| Online Access: | https://doi.org/10.1029/2024MS004540 |
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| author | Pouriya Alinaghi A. Pier Siebesma Fredrik Jansson Martin Janssens Franziska Glassmeier |
| author_facet | Pouriya Alinaghi A. Pier Siebesma Fredrik Jansson Martin Janssens Franziska Glassmeier |
| author_sort | Pouriya Alinaghi |
| collection | DOAJ |
| description | Abstract Recent observations of the trade‐wind regions highlight the covariability between cold‐pool properties and mesoscale cloud organization. Given the covariability of organization with cloud cover and albedo, this suggests a potential impact of cold pools on the cloud radiative effect (CRE). To explore this, we use an ensemble of 103 large‐domain, high‐resolution, large‐eddy simulations and investigate how the variability in cold pools is determined by large‐scale external cloud‐controlling factors and shaped by processes within the mesoscale. It is demonstrated that the size and frequency of occurrence of cold pools are strongly influenced by the near‐surface horizontal wind speed and large‐scale subsidence. The temporal evolution of cold pools is strongly correlated with the diurnality in radiation. Even without external variability, we find a strong intermittent behavior in the evolution of cold pools, governed by a complex interplay between cold pools and clouds which expresses itself in the form of shallow squall lines. These squall lines result from precipitating downdrafts, cold pool outflows and the resulting gust fronts, reinforcing parent clouds. Cold pools influence the CRE of trade cumuli, but only when they exist during the day. This emphasizes the importance of the synchronization between cold‐pool events and the diurnal cycle of insolation for the dependence of the CRE on cold pools. |
| format | Article |
| id | doaj-art-3a9196da03354132b63cf41c6f7f19d3 |
| institution | Kabale University |
| issn | 1942-2466 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Journal of Advances in Modeling Earth Systems |
| spelling | doaj-art-3a9196da03354132b63cf41c6f7f19d32025-01-28T13:21:09ZengAmerican Geophysical Union (AGU)Journal of Advances in Modeling Earth Systems1942-24662025-01-01171n/an/a10.1029/2024MS004540External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind RegimePouriya Alinaghi0A. Pier Siebesma1Fredrik Jansson2Martin Janssens3Franziska Glassmeier4Department of Geoscience & Remote Sensing Delft University of Technology Delft The NetherlandsDepartment of Geoscience & Remote Sensing Delft University of Technology Delft The NetherlandsDepartment of Geoscience & Remote Sensing Delft University of Technology Delft The NetherlandsDepartment of Geoscience & Remote Sensing Delft University of Technology Delft The NetherlandsDepartment of Geoscience & Remote Sensing Delft University of Technology Delft The NetherlandsAbstract Recent observations of the trade‐wind regions highlight the covariability between cold‐pool properties and mesoscale cloud organization. Given the covariability of organization with cloud cover and albedo, this suggests a potential impact of cold pools on the cloud radiative effect (CRE). To explore this, we use an ensemble of 103 large‐domain, high‐resolution, large‐eddy simulations and investigate how the variability in cold pools is determined by large‐scale external cloud‐controlling factors and shaped by processes within the mesoscale. It is demonstrated that the size and frequency of occurrence of cold pools are strongly influenced by the near‐surface horizontal wind speed and large‐scale subsidence. The temporal evolution of cold pools is strongly correlated with the diurnality in radiation. Even without external variability, we find a strong intermittent behavior in the evolution of cold pools, governed by a complex interplay between cold pools and clouds which expresses itself in the form of shallow squall lines. These squall lines result from precipitating downdrafts, cold pool outflows and the resulting gust fronts, reinforcing parent clouds. Cold pools influence the CRE of trade cumuli, but only when they exist during the day. This emphasizes the importance of the synchronization between cold‐pool events and the diurnal cycle of insolation for the dependence of the CRE on cold pools.https://doi.org/10.1029/2024MS004540cold poolstrade cumulusmesoscale patternscloud‐controlling factorslarge‐eddy simulationsself‐organization |
| spellingShingle | Pouriya Alinaghi A. Pier Siebesma Fredrik Jansson Martin Janssens Franziska Glassmeier External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime Journal of Advances in Modeling Earth Systems cold pools trade cumulus mesoscale patterns cloud‐controlling factors large‐eddy simulations self‐organization |
| title | External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime |
| title_full | External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime |
| title_fullStr | External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime |
| title_full_unstemmed | External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime |
| title_short | External Drivers and Mesoscale Self‐Organization of Shallow Cold Pools in the Trade‐Wind Regime |
| title_sort | external drivers and mesoscale self organization of shallow cold pools in the trade wind regime |
| topic | cold pools trade cumulus mesoscale patterns cloud‐controlling factors large‐eddy simulations self‐organization |
| url | https://doi.org/10.1029/2024MS004540 |
| work_keys_str_mv | AT pouriyaalinaghi externaldriversandmesoscaleselforganizationofshallowcoldpoolsinthetradewindregime AT apiersiebesma externaldriversandmesoscaleselforganizationofshallowcoldpoolsinthetradewindregime AT fredrikjansson externaldriversandmesoscaleselforganizationofshallowcoldpoolsinthetradewindregime AT martinjanssens externaldriversandmesoscaleselforganizationofshallowcoldpoolsinthetradewindregime AT franziskaglassmeier externaldriversandmesoscaleselforganizationofshallowcoldpoolsinthetradewindregime |