A multi-method Antarctic atmospheric blocking dataset based on ERA5 (1979–2024)
Rattachement africain : cl, nz, fr, us. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Version 2.0, July 2026. This release supersedes Version 1 and updates the percentile-based blocking methodology. For each calendar day, the local 90th-percentile threshold is calculated from anomalies within a centred 15-day running window (±7 days), pooled across all reference years. This approach provides a sufficiently large sample for stable percentile estimates while preserving the gradual seasonal evolution of anomaly variability.This update affects the percentile-based methods (PV-Perc, Z500-Perc, and Z500-Perc_detrend) and may therefore modify their blocking masks and derived products relative to Version 1. Code availability: The archive atmospheric_blocking_ERA5_code_v1.0.0.zip contains the scripts used to generate Version 2.0 of this dataset. The workflows are designed for Linux and HPC environments and use ERA5 input data, Python, CDO, and TempestExtremes. Software requirements, workflow structure, and configuration instructions are provided in the included README. Code author: Charlie Opazo. Overview of the Blocking Dataset Each folder corresponds to one blocking detection method applied to either Z500 or PV. The dataset contains the following method folders: PV-Abs, PV-SD, PV-Perc, Z500-Abs, Z500-Abs_detrend, Z500-Grad, Z500-Perc, Z500-Perc_detrend, Z500-SD, Z500-SD_detrend. All methods use the same data structure described below. 1. Variables Z500Geopotential height at 500 hPa. PVVertically integrated potential vorticity (150–500 hPa). 2. Blocking Detection Methods (names only) Absolute threshold method: Z500-Abs, PV-AbsStandard deviation anomaly method: Z500-SD, PV-SDPercentile-based anomaly method: Z500-Perc, PV-PercGradient method: Z500-GradDetrended variants: Z500-Abs_detrend, Z500-Perc_detrend, Z500-SD_detrend 3. Contents of Each Method Folder Every method folder contains four subdirectories: 3.1 blocking/ Instantaneous blocking masks (6-hourly, 1979–2024).Each file contains gridcell values: 1 = blocked, 0 = not blocked. 3.2 blocking_id/ Event ID fields for tracked blocking events and each blocked gridcell has an event number. 3.3 clim/ Blocking climatologies derived from the full record.Provided at annual, seasonal, and monthly timescales.Each includes: Blocking frequency Blocking intensity Blocking persistence Example filenames:ERA5_blocking_frequency_PV-Perc_clim_annual_SH.ncERA5_blocking_intensity_PV-Perc_clim_seasonal_SH.ncERA5_blocking_persistence_PV-Perc_clim_monthly_SH.nc 3.4 time_series/ Time series of blocking metrics aggregated over the Southern Hemisphere.Provided at annual, seasonal, and monthly timescales.Each includes: Blocking frequency Blocking intensity Blocking persistence Example filenames:ERA5_blocking_frequency_PV-Perc_timeseries_annual_SH.ncERA5_blocking_persistence_PV-Perc_timeseries_seasonal_SH.ncERA5_blocking_intensity_PV-Perc_timeseries_monthly_SH.nc 4. Summary Each blocking method folder includes: 1. blocking/ — instantaneous masks 2. blocking_id/ — labeled events 3. clim/ — climatologies 4. time_series/ — time series
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
Où se fait cette recherche
-
University of Valparaíso Department of Meteorology pays non établi dans la noticeUniversité ou école supérieure
-
University of Chile Department of Geophysics pays non établi dans la noticeUniversité ou école supérieure
-
Victoria University of Wellington pays non établi dans la noticeUniversité ou école supérieure
-
Centre National de la Recherche Scientifique pays non établi dans la noticeOrganisme public
-
Biogéosciences pays non établi dans la noticeStructure de recherche
-
Université Bourgogne Europe Biogéosciences pays non établi dans la noticeUniversité ou école supérieure
-
Institut des Géosciences de l'Environnement pays non établi dans la noticeStructure de recherche
-
Université Grenoble Alpes Institut des Géosciences de l'Environnement pays non établi dans la noticeUniversité ou école supérieure
-
Center for Climate and Resilience Research pays non établi dans la noticeStructure de recherche
-
Film Independent pays non établi dans la noticeOrganisation à but non lucratif
-
School of Geography pays non établi dans la noticeUniversité ou école supérieure
-
Independent Scholar pays non établi dans la noticeInstitution
Department of Meteorology — University of Valparaíso, Department of Geophysics — University of Chile et Victoria University of Wellington, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.