Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
<p>This study focuses on how aerosols, serving as cloud condensation nuclei (CCN), affect the properties of diurnal precipitation under the weak synoptic weather regime over complex topography, which is a common summertime environmental regime in Taiwan. Semi-realistic large-eddy simulations (...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/7b9bbbf86ff148adbadce940a6e93e43 |
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| Sumario: | <p>This study focuses on how aerosols, serving as cloud
condensation nuclei (CCN), affect the properties of diurnal precipitation
under the weak synoptic weather regime over complex topography, which is a
common summertime environmental regime in Taiwan. Semi-realistic large-eddy
simulations (LESs) were carried out using TaiwanVVM and driven by idealized
observational soundings. We perform object-based tracking analyses, which
diagnose both the spatial and temporal connectivity of convective systems,
aiming to reduce the variability in convection and align the aerosol effects
on the mature stage of the convective life cycle. In the hotspot areas of
strong orographic locking processes, the precipitation initiation is
postponed significantly when the CCN concentration is increased from the
clean scenario to the normal scenario, which prolongs the development of
local circulation and convection. For this organized regime, the occurrence
of the tracked extreme diurnal precipitating systems is notably enhanced.
Also, the 99th percentile of the maximum rain rate, cloud depth, and in-cloud
vertical velocity during the lifetime of the diurnal precipitating systems
increases by 9.4 %, 4.4 %, and 1.3 %. This study demonstrates that
the design of semi-realistic LESs, as well as the object-based tracking
analyses, is useful to investigate the responses of orographically driven
diurnal convective systems to ambient conditions.</p> |
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