Track dataset of Indian monsoon low-pressure systems in Subseasonal-to-Seasonal prediction models, ERA-Interim and MERRA-2 reanalysis datasets

This dataset contains tracks and intensities of Indian monsoon low-pressure systems (LPSs), as identified in all ensemble members of eleven models of the Subseasonal-to-Seasonal (S2S) prediction project during a common reforecast period of May–October 1999–2010. Track details of LPSs identified in the ERA-Interim and MERRA-2 reanalysis datasets during June–September 1999–2010. The temporal resolution of all S2S models is daily (0000 UTC), whereas that of ERA-Interim and MERRA-2 are six-hourly and three-hourly respectively. LPSs were tracked using a feature-tracking algorithm (Hunt et al., 2016; 2018), which is based on identifying and linking track points featuring 850 hPa relative vorticity maximum. Non-LPSs (e.g., heat lows) were eliminated from the dataset using a temperature-pressure filter. A full description of S2S models used in the dataset, and the tracking as well as post-tracking process is described in the paper: https://doi.org/10.1175/WAF-D-20-0081.1 <strong>Files: </strong> <strong> 1. S2S models </strong> <strong>bom_lps</strong>: contains track details of LPSs identified in all ensemble members of the Bureau of Meteorology model <strong>cma_lps</strong>: contains track details of LPSs identified in all ensemble members of the China Meteorological Administration model <strong>cnrm_lps</strong>: contains track details of LPSs identified in all ensemble members of the Météo France/Centre National de Recherche Meteorologiques model <strong>eccc_lps</strong>: contains track details of LPSs identified in all ensemble members of the Environment and Climate Change Canada model <strong>ecmwf_lps</strong>: contains track details of LPSs identified in all ensemble members of the European Centre for Medium-Range Weather Forecasts model <strong>hmcr_lps</strong>: contains track details of LPSs identified in all ensemble members of the Hydrometeorological Centre of Russia model <strong>isac-cnr_lps</strong>: contains track details of LPSs identified in all ensemble members of the Institute of Atmospheric Sciences and Climate of the National Research Council model <strong>jma_lps</strong>: contains track details of LPSs identified in all ensemble members of the Japan Meteorological Agency model <strong>kma_lps</strong>: contains track details of LPSs identified in all ensemble members of the Korea Meteorological Administration model <strong>ncep_lps</strong>: contains track details of LPSs identified in all ensemble members of the National Centers for Environmental Prediction model <strong>ukmo_lps</strong>: contains track details of LPSs identified in all ensemble members of the UK Met Office model <strong> Columns: </strong> <strong>candidate_id</strong>: a random identity number for each LPS <strong>hindcast</strong>: the reforecast date of a hindcast file from which an LPS was identified <strong>lat</strong>: the latitude of an LPS at a given time step <strong>lon</strong>: the longitude of an LPS at a given time step <strong>lead</strong>: the forecast lead time, calculated as the difference between the LPS date and reforecast date of the hindcast from which it was identified <strong>time</strong>: a time stamp showing when an LPS was present <strong>vort</strong>: the 850 hPa relative vorticity at the centre of an LPS at a given time step <strong>member</strong>: the ensemble member from which an LPS was identified; the control run is indicated by a zero (0) <strong> 2. Reanalysis datasets </strong> <strong>era-interim_lps</strong>: contains track details of LPSs identified in the ERA-Interim reanalysis dataset. <strong>merra-2_lps</strong>: contains track details of LPSs identified in the MERRA-2 reanalysis dataset. <strong>Columns:</strong> <strong>time</strong>: a time stamp showing when an LPS was present <strong>lon</strong>: the longitude of an LPS at a given time step <strong>lat</strong>: the latitude of an LPS at a given time step <strong>candidate_id</strong>: a random identity number for each LPS <strong>vort</strong>: the 850 hPa relative vorticity at the centre of an LPS at a given time step <em>For further details, contact Akshay Deoras ([e-mail]). </em>