Polster, C., and V. Wirth, 2023: The Onset of a Blocking Event as a “Traffic Jam”: Characterization with Ensemble Sensitivity Analysis. J. Atmos. Sci., 80, 1681–1699, https://dx.doi.org/10.1175/JAS-D-21-0312.1.
This repository contains the code to produce all figures of the article.
- Research by Christopher Polster and Volkmar Wirth.
- Software by Christopher Polster.
- hn2016_falwa package by Clare S. Y. Huang. The version included in this repository is 0.5.0 from August 2021. The package has seen significant improvements since (see releases) and we recommend using the latest version.
LICENSE. The contents of scripts/hn2016_falwa are re-distributed under the terms of their LICENSE.
Clone this repository:
$ git clone https://github.com/wavestoweather/Block-Dec2016-LWA-ESA.git
Use the scripts and instructions in the data directory to obtain the required input data. Before continuing, the data folder should look like this:
data
+ IFS-ENS
| + ENS-2016-12-09T12Z
| | + ENS-2016-12-09T12Z-t.nc
| | + ENS-2016-12-09T12Z-u.nc
| | + ENS-2016-12-09T12Z-v.nc
| + ENS-2016-12-10T00Z
| | + ENS-2016-12-10T00Z-t.nc
| | + ENS-2016-12-10T00Z-u.nc
| | + ENS-2016-12-10T00Z-v.nc
| + ENS-2016-12-10T12Z
| | + ENS-2016-12-10T12Z-t.nc
| | + ENS-2016-12-10T12Z-u.nc
| | + ENS-2016-12-10T12Z-v.nc
| + ENS-2016-12-11T00Z
| | + ENS-2016-12-11T00Z-t.nc
| | + ENS-2016-12-11T00Z-u.nc
| | + ENS-2016-12-11T00Z-v.nc
| + EVAL
| | + ENS-DEC18-EVAL-2016-12-08T00Z.nc
| | + ENS-DEC18-EVAL-2016-12-08T12Z.nc
| | + ...
| | + ENS-DEC18-EVAL-2016-12-18T00Z.nc
| | + eval-requests.py
| | + eval-submit
| | + eval-to-netcdf
| + job.sh
+ download-ERA5.py
+ ERA-2016-12-10-to-2016-12-24-uvt.nc
+ README.md
Note that while the analysis and plots are based on 2° data, 1° data is obtained by the provided download scripts.
Input data is coarsened during processing (--half-resolution parameter of scripts.calculate-lwa).
The following software needs to be available to run the data processing and plotting scripts:
- make
- Fortran compiler (for building the
hn2016_falwaPython extensions) - C compiler with OpenMP (for building Python extensions)
- Python 3 with packages listed in
requirements.txt(the specified minumum versions were used during development, older versions may or may not work) - lualatex with fontspec, amsmath, tikz, graphicx (Fig. 1 and to combine panels for Fig. 8)
Run
$ make
from the top-level of the repository. This will compile the Python extensions, compute the intermediate PV, LWA and flux fields and create all plots. Use --dry-run to check the sequence of commands to be executed by make first. Use -jN to run N jobs in parallel if you have sufficient CPU and memory resources to do so.
Figures will appear in the figures directory:
- Fig. 1:
figures/forecast-combination.pdf - Fig. 2:
figures/event24-reanalysis+nh18fig5.pdf - Fig. 3:
figures/event24-plume.pdf - Fig. 4:
figures/event24-budget.pdf - Fig. 5:
figures/event24-evaluation.pdf - Fig. 6:
figures/idealized.pdf - Fig. 7:
figures/event24-maps+hovmoeller.pdf - Fig. 8:
figures/event24-cluster+scatter.pdf - Fig. 9:
figures/event24-maps-separate.pdf - Fig. 10:
figures/event24-cluster-f2.pdf - Fig. 11:
figures/event24-nh18fig4.pdf, does not contain the fits of Nakamura and Huang (2018) due to licensing restrictions
Because the statistical significance test is based on a randomized procedure, results may vary slightly each time the plots are created.
This research project has been carried out within the Transregional Collaborative Research Center SFB/TRR 165 "Waves to Weather" funded by the German Science Foundation (DFG). https://www.wavestoweather.de/