Lamb weather types (reduced set) and gale days over the North Sea since 1948 based on NCEP/NCAR Reanalysis 1 daily mean sea level pressure fields
doi:10.26050/WDCC/LambWTyRSetAndGaleDaysOverTheNo
Loewe, Peter
ExperimentDOI
ATMODATatmosatmosphereAtmospheric dynamicsclimateEASYDABFOS: Earth and related environmental scienceNCEP/NCAR ReanalysisNorth Sea
- Summary
- Sea level pressure is a fundamental weather and climate element and the very basis of everyday weather maps. Daily sea level pressure distributions provide information on the influence of high and low pressure systems, air flow, weather activity, and, hence, synoptic conditions.
Using sea level pressure distributions from the NCEP/NCAR Reanalysis 1 (Kalnay et al., 1996) and a simplified variant of the weather-typing scheme by Jenkinson and Collison (1977) atmospheric circulation over the North Sea has been classified as to pattern and intensity on a daily basis starting in 1948. A full account of the original weather-typing scheme can be found in Loewe et al. (2005), while the variant scheme has been detailed in Loewe et al. (2006). The analysis has been carried out on the original 16-point grid. Though formally valid at its central point (55°N, 5°E), results are representative of the North Sea region between 50°N-60°N and 0°E-10°E.
The modified scheme allows for six weather types, namely four directional (NE=Northeast, SE, SW, NW) and two rotational types (C=cyclonic and A=anticyclonic). The strength of the atmospheric circulation is classified by way of a peak-over-threshold technique, employing re-calibrated thresholds for the gale index G* of 28.3, 36.6, and 44.6 hPa for gale (G), severe gale (SG), and very severe gale (VSG), respectively (Loewe et al., 2013). Technically, the set of weather-typing and gale-classification rules is implemented as a lean FORTRAN code (lwtnssim.f), internally known as "Simple Lamb weather-typing scheme for the North Sea v1". The processing run was done on a Linux server under Debian 10 (Buster).
Both, weather types and gale days, form a catalogue of more than 70 annual calendars since 1948 that is presented and continuously updated to the present day at https://www.bsh.de/EN/DATA/Climate-and-Sea/Weather-and-Gales/weather-and-gales_node.html. This catalogue concisely documents synoptic conditions in the North Sea region. Possible benefits are manifold. Special events and episodes in regional-scale atmospheric circulation are easily looked up and traced. Beyond that, the dataset is well suited for frequency, trend, persistence, transition, and extreme-value statistics. - Project
- BSHwt (BSH weather type and gale catalogues)
- Contact
- Nils Schade (Nils.Schade@nullbsh.de0000-0002-3558-0581)
Tim Kruschke (Tim.Kruschke@nullbsh.de0000-0002-1205-3754)
Peter Loewe (leeuwenhart@nullonline.de0000-0001-8243-2111) - Spatial Coverage
- Longitude 0 to 10 Latitude 50 to 60
- Temporal Coverage
- 1948-01-01 to 2023-12-31 (standard)
- Use constraints
- Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/)
- Data Catalog
- World Data Center for Climate
- Size
- 8.88 MiB (9306176 Byte)
- Format
- NetCDF
- Status
- will be continued
- Creation Date
- Future Review Date
- 2032-02-10
- Cite as
- Loewe, Peter (2022). Lamb weather types (reduced set) and gale days over the North Sea since 1948 based on NCEP/NCAR Reanalysis 1 daily mean sea level pressure fields. World Data Center for Climate (WDCC) at DKRZ. https://doi.org/10.26050/WDCC/LambWTyRSetAndGaleDaysOverTheNo
BibTeX RIS
- Description
- Number of checked files: 74
Mandatory checks passed: 296/296 (0 missing, 0 error(s))
Recommended checks passed: 1258/1480 (222 missing, 0 error(s))
Optional checks passed: 370/666 (296 missing, 0 error(s))
CF checker errors: 0
CF checker warnings: 148
Data added: year 2022
ATMODAT Standard Compliance Checker Version: 1.3.2 2023-03-31
Number of checked netCDF files: 1
Mandatory ATMODAT Standard checks passed: 4/4 (0 missing, 0 error(s))
Recommended ATMODAT Standard checks passed: 17/20 (3 missing, 0 error(s))
Optional ATMODAT Standard checks passed: 5/9 (4 missing, 0 error(s))
CF checker errors: 0
CF checker warnings: 2
Data added: year 2023
ATMODAT Standard Compliance Checker Version: 1.3.2
Checking against: ATMODAT Standard 3.0, CF Version 1.8
Checked at: 2024-02-21T08:41:39
Number of checked netCDF files: 1
Mandatory ATMODAT Standard checks passed: 4/4 (0 missing, 0 error(s))
Recommended ATMODAT Standard checks passed: 17/20 (3 missing, 0 error(s))
Optional ATMODAT Standard checks passed: 5/9 (4 missing, 0 error(s))
CF checker errors: 0
CF checker warnings: 2 - Method
- ATMODAT Standard Compliance Checker Version: 1.2.0
- Method Description
- Checking against: ATMODAT Standard 3.0. Metrics documentation: https://doi.org/10.35095/WDCC/atmodat_standard_en_v3_0 and CF Version 1.8
- Method Url
- Result Date
- 2022-02-10
- Description
- The quality of the NCEP/NCAR reanalyses input data is described in detail in Kalnay et al. (1996); see reference.
An evaluation of the weather type classification based on NCEP/NCAR reanalyses is given by Loewe et al. (2013); see references.
For a comparative evaluation of different weather type classification methods, please refer to Tveito et al. (2016),COST Action 733: harmonization and application of weather type classifications for European Regions; final scientific report. University of Augsburg, Germany. https://opus.bibliothek.uni-augsburg.de/opus4/3768.
- Description
- Summary:
Findable: 6 of 7 level;
Accessible: 2 of 3 level;
Interoperable: 3 of 4 level;
Reusable: 5 of 10 level - Method
- F-UJI online v2.2.1 automated
- Method Description
- Checks performed by WDCC. Metrics documentation: https://doi.org/10.5281/zenodo.4081213 Metric Version: metrics_v0.5
- Method Url
- Result Date
- 2022-12-06
- Result Date
- 2022-02-17
- Description
- Annotation Angelika Heil
- checker results evaluating 74 BSH_simple-Lamb-weather-type-and-gale-calendar_North-Sea_lwtns06_${YEAR}.nc files prior publication at
https://www.wdc-climate.de/ui/entry?acronym=LambWTyRSetAndGaleDaysOverTheNo
- the NetCDF files do not fulfill the following global attributes which are either recommended or optional in the ATMODAT standard 3.0 because they are not applicable:
- crs
- source_type
- nominal_resolution
- further_info_url
- processing_level
- program
- project
- Description
- 1. Number of data sets is correct and > 0: passed;
2. Size of every data set is > 0: passed;
3. The data sets and corresponding metadata are accessible: passed;
4. The data sizes are controlled and correct: passed;
5. The temporal coverage description (metadata) is consistent to the data: passed;
6. The format is correct: passed;
7. Variable description and data are consistent: passed
2023-05-09 data added with TQA checks - Method
- WDCC-TQA checklist
- Method Description
- Checks performed by WDCC. The list of TQA metrics are documented in the 'WDCC User Guide for Data Publication' Chapter 8.1.1
- Method Url
- Result Date
- 2022-02-16
| Contact type | Person | ORCID | Organization |
|---|---|---|---|
Is derived from
[1] DOI Kalnay, E.; Kanamitsu, M.; Kistler, R.; Collins, W.; Deaven, D.; Gandin, L.; Iredell, M.; Saha, S.; White, G.; Woollen, J.; Zhu, Y.; Leetmaa, A.; Reynolds, R.; Chelliah, M.; Ebisuzaki, W.; Higgins, W.; Janowiak, J.; Mo, K. C.; Ropelewski, C.; Wang, J.; Jenne, Roy; Joseph, Dennis. (1996). The NCEP/NCAR 40-Year Reanalysis Project. doi:10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2
[2] NOAA/OAR/ESRL Physical Sciences Laboratory, Boulder, Colorado, USA. (2014). NCEP/NCAR Reanalysis 1: Surface - Sea Level Pressure (Daily), 1948-continuing. https://www.psl.noaa.gov/data/gridded/data.ncep.reanalysis.surface.html
Is documented by
[1] Jenkinson, Arthur F.; Collison, Peter. (1977). An Initial Climatology of Gales over the North Sea. Synoptic Climatology Branch Memorandum no. 62. Bracknell, UK Meteorological Office, London.
[2] Loewe, Peter; Klein, Holger; Becker, Gerd; Nies, Hartmut; Brockmann, Uwe; Schmolke, Stefan; Dick, Stephan; Schrader, Dieter; Frohse, Alexander; Schulz, Achim; Herrmann, Jürgen; Theobald, Norbert; Klein, Birgit; Sieglinde, Weigelt. (2006). Nordseezustand 2004. Berichte des Bundesamtes fuer Seeschifffahrt und Hydrographie Nr. 40. ISBN 0946-6010. https://www.bsh.de/download/Berichte-des-BSH-40.pdf
[3] Loewe, Peter; Klein, Holger; Weigelt-Krenz, Sieglinde. (2013). System Nordsee 2006 und 2007 – Zustand und Entwicklungen. Berichte des Bundesamtes fuer Seeschifffahrt und Hydrographie Nr. 49. ISBN 0946-6010. https://www.bsh.de/download/Berichte-des-BSH-49.pdf
[4] Loewe, Peter; Klein, Holger; Schmolke, Stefan; Müller-Navarra, Sylvin; Becker, Gerd; Nies, Hartmut; Brockmann, Uwe; Schmelzer, Natalija; Dick, Stephan; Schrader, Dieter; Engelke, Clemens; Schulz, Achim; Frohse, Alexander; Theobald, Norbert; Horn, Wilfried; Weigelt, Sieglinde. (2005). Nordseezustand 2003. Berichte des Bundesamtes fuer Seeschifffahrt und Hydrographie Nr. 38. ISBN 0946-6010 . https://www.bsh.de/download/Berichte-des-BSH-38.pdf
Attached Datasets ( 1 )
Parent project(s)
[Entry acronym: LambWTyRSetAndGaleDaysOverTheNo] [Entry id: 3893192]