Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa
Abstract Due to their potential role in organizing tropical mesoscale convective systems, a better understanding of cold pool (CP) dynamics in such regions is critical, particularly over land where the diurnal cycle further concentrates convective activity. Numerical models help disentangle the proc...
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| Format: | Article |
| Language: | English |
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Wiley
2024-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL107308 |
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| author | Jannik Hoeller Jan O. Haerter Nicolas A. DaSilva |
| author_facet | Jannik Hoeller Jan O. Haerter Nicolas A. DaSilva |
| author_sort | Jannik Hoeller |
| collection | DOAJ |
| description | Abstract Due to their potential role in organizing tropical mesoscale convective systems, a better understanding of cold pool (CP) dynamics in such regions is critical, particularly over land where the diurnal cycle further concentrates convective activity. Numerical models help disentangle the processes involved but often lack observational benchmarks. To close this gap, we analyze nearly 43 years of five‐minute resolution near‐surface timeseries, recorded from 12 automatic weather stations across equatorial Africa during 2019–2023. We identify 4,218 CPs based on criteria for temperature and wind. The identified CP gust fronts, which exhibit respective median temperature and specific humidity decreases of 5.3 K and 2.8 g kg−1, closely correlate with satellite‐observed brightness temperature discontinuities. Despite weak diurnal variation in precipitation, observed CP occurrence shows a pronounced diurnal cycle with an afternoon peak — a feature we attribute to low‐level moisture conditions. Our findings can serve as observational benchmark to improve simulations of CP organization. |
| format | Article |
| id | doaj-art-bcfeeb2921e44c5ba61c7eb8d76259f0 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-bcfeeb2921e44c5ba61c7eb8d76259f02025-08-20T01:51:57ZengWileyGeophysical Research Letters0094-82761944-80072024-03-01516n/an/a10.1029/2023GL107308Characteristics of Station‐Derived Convective Cold Pools Over Equatorial AfricaJannik Hoeller0Jan O. Haerter1Nicolas A. DaSilva2Integrated Modeling Leibniz Centre for Tropical Marine Research Bremen GermanyIntegrated Modeling Leibniz Centre for Tropical Marine Research Bremen GermanyIntegrated Modeling Leibniz Centre for Tropical Marine Research Bremen GermanyAbstract Due to their potential role in organizing tropical mesoscale convective systems, a better understanding of cold pool (CP) dynamics in such regions is critical, particularly over land where the diurnal cycle further concentrates convective activity. Numerical models help disentangle the processes involved but often lack observational benchmarks. To close this gap, we analyze nearly 43 years of five‐minute resolution near‐surface timeseries, recorded from 12 automatic weather stations across equatorial Africa during 2019–2023. We identify 4,218 CPs based on criteria for temperature and wind. The identified CP gust fronts, which exhibit respective median temperature and specific humidity decreases of 5.3 K and 2.8 g kg−1, closely correlate with satellite‐observed brightness temperature discontinuities. Despite weak diurnal variation in precipitation, observed CP occurrence shows a pronounced diurnal cycle with an afternoon peak — a feature we attribute to low‐level moisture conditions. Our findings can serve as observational benchmark to improve simulations of CP organization.https://doi.org/10.1029/2023GL107308cold pool observationssust frontstropical convectionequatorial Africaconvective organizationcold pool identification |
| spellingShingle | Jannik Hoeller Jan O. Haerter Nicolas A. DaSilva Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa Geophysical Research Letters cold pool observations sust fronts tropical convection equatorial Africa convective organization cold pool identification |
| title | Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa |
| title_full | Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa |
| title_fullStr | Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa |
| title_full_unstemmed | Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa |
| title_short | Characteristics of Station‐Derived Convective Cold Pools Over Equatorial Africa |
| title_sort | characteristics of station derived convective cold pools over equatorial africa |
| topic | cold pool observations sust fronts tropical convection equatorial Africa convective organization cold pool identification |
| url | https://doi.org/10.1029/2023GL107308 |
| work_keys_str_mv | AT jannikhoeller characteristicsofstationderivedconvectivecoldpoolsoverequatorialafrica AT janohaerter characteristicsofstationderivedconvectivecoldpoolsoverequatorialafrica AT nicolasadasilva characteristicsofstationderivedconvectivecoldpoolsoverequatorialafrica |