2022
DOI: 10.1016/j.atmosres.2022.106426
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The ERA5's diurnal cycle of low-level clouds over Western Central Africa during June–September: Dynamic and thermodynamic processes

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Cited by 10 publications
(11 citation statements)
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“…Afternoon low‐level clouds are thus the most sensitive part of the diurnal cycle at the interannual time scale. This sensitivity fits well with the mean diurnal cycle in JJAS, which shows minimal LCF during the afternoon and early night (Champagne et al, 2023; Dommo et al, 2022). While the agreement between station diurnal types and their corresponding ERA5 grid‐points is only moderate at daily time scale, the interannual variations are very similar over the cloudiest area of Gabon and southwestern RC represented by the leading JJAS principal component of the anomalous frequencies of the diurnal types.…”
Section: Summary and Concluding Remarkssupporting
confidence: 77%
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“…Afternoon low‐level clouds are thus the most sensitive part of the diurnal cycle at the interannual time scale. This sensitivity fits well with the mean diurnal cycle in JJAS, which shows minimal LCF during the afternoon and early night (Champagne et al, 2023; Dommo et al, 2022). While the agreement between station diurnal types and their corresponding ERA5 grid‐points is only moderate at daily time scale, the interannual variations are very similar over the cloudiest area of Gabon and southwestern RC represented by the leading JJAS principal component of the anomalous frequencies of the diurnal types.…”
Section: Summary and Concluding Remarkssupporting
confidence: 77%
“…To overcome some of the above issues, a k ‐means cluster analysis is applied to unfiltered diurnal LCF variations (i.e., variations within 1 day) (Figure 5). The clustering enables classifying all days at all available stations into basic diurnal types (DTs, see section 3.3), portraying typical variations of low cloud cover relative to the mean diurnal cycle, which usually peaks in late night and morning and decreases during the afternoon (Champagne et al, 2023; Dommo et al, 2022). The methodology, detailed in Figure 5, allows the optimization of the available data by following two different paths: (1) Using first the small set of complete daily records to define the DTs as centroids of the clusters of diurnal 3‐hourly LCF (upper part of Figure 5) and (2) then projecting the remaining incomplete days (and ERA5), sampling at least the LCF around its usual highest and lowest daily intensity (lower part of Figure 5).…”
Section: Space–time Variations Of the Stratiform Cloud Deckmentioning
confidence: 99%
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“…It was found temporally consistent with Moderate Resolution Imaging Spectroradiometer (MODIS) data. The diurnal cycle of LCF from ERA5 also matches with the Extended Edited Synoptic Cloud Reports Archive (EECRA) data(Dommo et al 2022).…”
supporting
confidence: 60%
“…With a 0.25 • horizontal grid, ERA5 can provide hourly horizontal wind, air temperature and humidity data, and it has 37 pressure levels below 1 hPa [48]. Because of its great geographical and temporal resolution, ERA5 has been frequently employed in studies on air pollution [49], clouds [50] and heavy rainfall [51]. In this study, ERA5 was used from 2016 to 2021, and the high spatiotemporal resolutions of the ERA5 dataset can meet the criteria of vertical structure analysis [52][53][54].…”
Section: Era5 Reanalysis Datamentioning
confidence: 99%