Processes governing the amplification of ensemble spread in a medium‐range forecast with large forecast uncertainty
- Publication type:
- Journal article
- Metadata:
-
- Abstract
- <jats:p>This study provides a process‐based perspective on the amplification of forecast uncertainty and forecast errors in ensemble forecasts. A case from the North Atlantic Waveguide and Downstream Impact Experiment that exhibits large forecast uncertainty is analysed. Two aspects of the ensemble behaviour are considered: (a) the mean divergence of the ensemble members, indicating the general amplification of forecast uncertainty, and (b) the divergence of the best and worst members, indicating extremes in possible error‐growth scenarios. To analyse the amplification of forecast uncertainty, a tendency equation for the ensemble variance of potential vorticity (PV) is derived and partitioned into the contributions from individual processes. The amplification of PV variance is, on average for the midlatitudes of the Northern Hemisphere, dominated by near‐tropopause dynamics. Locally, however, other processes can dominate the variance amplification, for example, in the region where tropical storm <jats:italic>Karl</jats:italic> interacts with the Rossby‐wave pattern during extratropical transition. In this region, the variance amplification is dominated by upper‐tropospheric divergence and tropospheric–deep interaction and is thereby mostly related to (moist baroclinic) cyclone development. The differences between the error growth in the best and worst ensemble members can, to a large part, be attributed to differences in the representation of cut‐off evolution around 3 days, which subsequently amplifies substantially in the highly nonlinear region of the Rossby‐wave pattern until 5 days. In terms of the processes, the differences in error growth are dominated by differences in the error growth by near‐tropopause dynamics. The approach presented provides flow‐dependent insight into the dynamics of forecast uncertainty and forecast errors and helps to understand better the different contributions of specific weather systems to the medium‐range amplification of ensemble spread.</jats:p>
- Autoren
- Marlene Baumgart
- Michael Riemer
- DOI
- 10.1002/qj.3617
- eISSN
- 1477-870X
- ISSN
- 0035-9009
- Ausgabe der Veröffentlichung
- 724
- Zeitschrift
- Quarterly Journal of the Royal Meteorological Society
- Sprache
- en
- Online publication date
- 2019
- Paginierung
- 3252 - 3270
- Datum der Veröffentlichung
- 2019
- Status
- Published
- Herausgeber
- Wiley
- Herausgeber URL
- http://dx.doi.org/10.1002/qj.3617
- Datum der Datenerfassung
- 2023
- Titel
- Processes governing the amplification of ensemble spread in a medium‐range forecast with large forecast uncertainty
- Ausgabe der Zeitschrift
- 145
Data source: Crossref
- Other metadata sources:
-
- Author's licence
- CC-BY
- Autoren
- Marlene Baumgart
- Michael Riemer
- Hosting institution
- Universitätsbibliothek Mainz
- Sammlungen
- JGU-Publikationen
- Resource version
- Published version
- DOI
- 10.1002/qj.3617
- File(s) embargoed
- false
- Open access
- true
- ISSN
- 1477-870X
- Ausgabe der Veröffentlichung
- 724
- Zeitschrift
- Quarterly Journal of the Royal Meteorological Society
- Schlüsselwörter
- 530 Physik
- 530 Physics
- Sprache
- eng
- Open access status
- Open Access
- Paginierung
- 3252 - 3270
- Datum der Veröffentlichung
- 2019
- Public URL
- https://openscience.ub.uni-mainz.de/handle/20.500.12030/7051
- Herausgeber
- Wiley
- Datum der Datenerfassung
- 2022
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2022
- Zugang
- Public
- Titel
- Processes governing the amplification of ensemble spread in a medium-range forecast with large forecast uncertainty
- Ausgabe der Zeitschrift
- 145
Files
processes_governing_the_ampli-20220525102510852.pdf
Data source: OPENSCIENCE.UB
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