Signatures of Eurasian heat waves in global Rossby wave spectra

Abstract χ 2 k = 0), a decrease in skewness is found, although it is not statistically significant. A reduction in skewness hints to an increase in the number of active degrees of freedom, indicating more independent modes involved in the circulation. A shift in the spectral distribution of the k = 0 intramonthly variance is shown to describe a weakening of the mean westerlies near their core at 45∘  N and their strengthening at high latitudes. At planetary scales (k =  1–3), the skewness in the troposphere–barotropic Rossby wave energy significantly increases during HWs. This coincides with a reduction of intramonthly variance, in particular at k = 3, and persistent large-scale circulation anomalies. Based on the χ 2 k =  4–10), no change in skewness is detected for the Eurasian HWs. However, synoptic waves k =  7–8 are characterised by a statistically significant increase in intramonthly variance of about 5 % with respect to the climatology. In addition, a shift of the entire Rossby wave energy distribution at synoptic scales, along with amplification, is observed during HWs.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Signatures of Eurasian heat waves in global Rossby wave spectra ; volume:3 ; number:4 ; year:2022 ; pages:1399-1414 ; extent:16 ; Weather and climate dynamics ; 3, Heft 4 (2022), 1399-1414 (gesamt 16)

Contributors, Places and Time

• Creator: Strigunova, Iana ; Blender, Richard ; Lunkeit, Frank ; Žagar, Nedjeljka

Further information

• DOI: 10.5194/wcd-3-1399-2022
• URN: urn:nbn:de:101:1-2022120804422464613255
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:28 AM CEST