Format:
Online-Ressource
ISSN:
1680-7324
Content:
Abstract 1/4 from linear stability analysis. However, Ri Ri 〈 1/4 is inevitably underestimated by the ERA5 reanalysis over all climate zones at all heights from the near-ground atmosphere up to 30 km, compared to radiosonde, due directly to the severe underestimation in wind shears. Otherwise, the occurrence frequency of Ri 〈 1 in ERA5 is climatologically consistent with that from Ri 〈 1/4 in radiosondes in the free troposphere, especially over the midlatitude and subtropics in the Northern Hemisphere and Southern Hemisphere. Therefore, we argue that the threshold value of Ri 1/4 when using ERA5-based Ri as a proxy for KHI. The occurrence frequency of subcritical Ri revealed by both datasets exhibits significant seasonal cycles over all climate zones. In addition, it is positively correlated with the standard derivation of orography at low levels and is exceptionally strong over the Niño-3 region at heights of 6–13 km. Furthermore, a high occurrence of subcritical Ri would likely be accompanied by strong wind speeds and intensive orographic or non-orographic gravity waves.
In:
volume:23
In:
number:19
In:
year:2023
In:
pages:12589-12607
In:
extent:19
In:
Atmospheric chemistry and physics, Katlenburg-Lindau : EGU, 2001-, 23, Heft 19 (2023), 12589-12607 (gesamt 19), 1680-7324
Language:
English
DOI:
10.5194/acp-23-12589-2023
URN:
urn:nbn:de:101:1-2023101204195119472420
URL:
https://doi.org/10.5194/acp-23-12589-2023
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2023101204195119472420
URL:
https://d-nb.info/1305749995/34
URL:
https://acp.copernicus.org/articles/23/12589/2023/acp-23-12589-2023.pdf
URL:
https://acp.copernicus.org/articles/23/12589/2023/
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