Tracks of negative upper-tropospheric PV anomalies (PVAs$^{-}$) over the Northern Hemisphere in ERA5 reanalysis (1979-2021) ...

• Main Authors: Hauser, Seraphine, Teubler, Franziska, Riemer, Michael, Knippertz, Peter, Grams, Christian M.
• Format: Dataset
• Language: unknown
• Published: Karlsruhe Institute of Technology 2024
• Subjects: Allgemeines, Hochschulwesen, Wissenschaft und Forschung; Greenland
• Online Access: https://dx.doi.org/10.35097/nncxpglaaadgvkiw; https://radar.kit.edu/radar/en/dataset/nncxPGLAaaDgVKIW

This archive contains identified negative, upper-tropospheric PV anomalies (short: PVAs$^{-}$) and their tracks for the period 1979-2021 over the Northern Hemisphere based on ERA5 reanalysis data and represents the basis for recent publications on atmospheric blocking dynamics (e.g., Oertel et al., 2023; Hauser et al., 2023; Wenta et al., 2024; Hauser et al., 2024). Details on the method to identify and track PVAs- are provided in Hauser et al. (2024). References: Hauser, S., Teubler, F., Riemer, M., Knippertz, P., and Grams, C. M. (2023): Towards a holistic understanding of blocked regime dynamics through a combination of complementary diagnostic perspectives, Weather and Climate Dynamics, 4, 399–425, https://doi.org/10.5194/wcd-4-399-2023 Hauser, S., Teubler, F., Riemer, M., Knippertz, P., and Grams, C. M. (2024): Life cycle dynamics of Greenland blocking from a potential vorticity perspective, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2945. Oertel, A., Pickl, M., Quinting, J. F., ... : The identification and tracking of PVAs$^{-}$ is based on ERA5 reanalysis data on model levels from the European Centre for Medium-Range Weather Forecasts (ECMWF) with a horizontal resolution of 0.5° and a temporal resolution of 3 hours (Hersbach et al., 2020). The following data covering the period 1979 to 2021 are stored in this archive: (1) Fields of upper-tropospheric PV anomalies: A vertical, weighted average is performed based on model level ERA5 data between 500 and 150hPa. Anomalies are calculated based on a 30-day centered running-mean climatology (1979-2021). This variable (vertically-averaged PV anomaly; ‘VAPVA’; in PV Units) is stored in the netCDF files in the archive. (2) Identified negative, upper-tropospheric PV anomaly objects: Due to the interest in their link to atmospheric blocking, negative anomalies as 2D objects (PVAs$^{-}$) are identified using a percentile threshold (described in detail in Hauser et al., 2024). These objects are stored along the fields of upper-tropospheric PV ...