de.dkrz.wdcc.iso3893192 series LambWTyRSetAndGaleDaysOverTheNo Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html author Nils Schade Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact Tim Kruschke Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html originator 2022-02-18T04:25:23 ISO 19115 ISO 19139 / DKRZ ISO Simple Profile V1.0 http://doi.org/doi:10.26050/WDCC/LambWTyRSetAndGaleDaysOverTheNo 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 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 2022-02-07 creation None 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 Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html originator doi:10.26050/WDCC/LambWTyRSetAndGaleDaysOverTheNo 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. Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html author Nils Schade Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact Tim Kruschke Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact Peter Loewe Bundesamt für Seeschifffahrt und Hydrographie https://www.bsh.de/EN/Home/home_node.html pointOfContact NCEP theme re-analysis theme Baltic Sea theme North Sea theme gale theme ATMODAT (v3.0) theme weather types theme atmos theme Meteorology and atmospheric sciences theme eng 0.0 10.0 50.0 60.0 1948-01-01 2021-12-31 0 Lamb modelResult 1 gale modelResult 1 rotation modelResult 1 wind_from_direction modelResult degree NetCDF network Common Data Format distributor Mb 9 http://doi.org/doi:10.26050/WDCC/LambWTyRSetAndGaleDaysOverTheNo series