Please use this identifier to cite or link to this item:
http://doi.org/10.25358/openscience-7037
Authors: | Baumgart, Marlene Riemer, Michael |
Title: | Processes governing the amplification of ensemble spread in a medium-range forecast with large forecast uncertainty |
Online publication date: | 25-May-2022 |
Year of first publication: | 2019 |
Language: | english |
Abstract: | 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 Karl 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. |
DDC: | 530 Physik 530 Physics |
Institution: | Johannes Gutenberg-Universität Mainz |
Department: | FB 08 Physik, Mathematik u. Informatik |
Place: | Mainz |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-7037 |
Version: | Published version |
Publication type: | Zeitschriftenaufsatz |
License: | CC BY |
Information on rights of use: | https://creativecommons.org/licenses/by/4.0/ |
Journal: | Quarterly Journal of the Royal Meteorological Society 145 724 |
Pages or article number: | 3252 3270 |
Publisher: | Wiley |
Publisher place: | Weinheim |
Issue date: | 2019 |
ISSN: | 1477-870X |
Publisher DOI: | 10.1002/qj.3617 |
Appears in collections: | JGU-Publikationen |
Files in This Item:
File | Description | Size | Format | ||
---|---|---|---|---|---|
processes_governing_the_ampli-20220525102510852.pdf | 9.74 MB | Adobe PDF | View/Open |