A quasi-Lagrangian perspective on the role of dry and moist processes in the formation of blocked North Atlantic–European weather regimes

Hauser, Seraphine; Teubler, Franziska; Riemer, Michael; Grams, Christian M.

doi:10.5194/wcd-7-937-2026

Articles | Volume 7, issue 2

https://doi.org/10.5194/wcd-7-937-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wcd-7-937-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 7, issue 2

Research article

|

15 Jun 2026

Research article |

| 15 Jun 2026

A quasi-Lagrangian perspective on the role of dry and moist processes in the formation of blocked North Atlantic–European weather regimes

Seraphine Hauser, Franziska Teubler, Michael Riemer, and Christian M. Grams

Data sets

Tracks of negative upper-tropospheric PV anomalies (PVAs-) over the Northern Hemisphere in ERA5 reanalysis (1979-2021) Seraphine Hauser et al. https://doi.org/10.35097/nncxPGLAaaDgVKIW

Year-round North Atlantic-European Weather Regimes in ERA5 reanalyses Christian M. Grams et al. https://doi.org/10.5281/zenodo.17080146

Complete ERA5 from 1940: Fifth generation of ECMWF atmospheric reanalyses of the global climate Hans Hersbach et al. https://doi.org/10.24381/cds.143582cf

Short summary

The relative roles of dry and moist processes in blocking formation are still not well understood, especially across different blocking types and regions. Using a potential vorticity framework, we study the evolution of large-scale anticyclonic circulation anomalies that are linked to four distinct blocking patterns. We find that the development of anomaly amplitude is shaped mainly by their pathway, which determines the balance between dry and moist contributions, rather than the blocking type.