Showing results for: [ CLSD PCCSAP TC Downscaling & Coincident ]
Three empirically-derived indices of tropical cyclone genesis - Genesis Potential Index (labelled in files as "gpi"), Murakami-GPI ("GPIM") and Tippett Index ("TCGI") - have been applied to monthly ou... moretputs of a suite of CMIP5 models.
The indices each use combinations of monthly mean meteorological and sea surface temperature fields in order to indicate regions with favourable conditions for the generation of tropical cyclones (known as cyclogenesis).
The resulting outputs have been calculated over three time periods. Data are in the form of netCDF files containing time series of either seasonal or annual averages for each index. The files are arranged inside folders named after the CMIP5 model from which these products have been derived (note: these are not the official CMIP5 model names).
Index outputs are stored over each of the following periods:
- 1980 to 1999 (historical),
- 2046 to 2065 (rcp85), and
- 2081 to 2100 (rcp85)
where the bracketed text indicates the CMIP5 Representative Concentration Pathway (RCP) used to provide the climate forcings for the simulation.
The seasonal time series files are labelled with the above year ranges, with a file name structure of:
The files containing annual average time series have file names of the form:
The [year] label in the annual average file names corresponds to the first year of one of the respective periods above, respectively:
- 2046, and
CLSD PCCSAP TC Downscaling & Coincident - CMIP 5 model analysis of tropical cyclone behaviour - Published 02 Jul 2015
This data collection consists of:
1. ASCII text files listing each tropical cyclone detected within output of a suite of CMIP5 models for the Pacific region contained by latitudes 20N to 40S, and long... moreitudes 135E to 150W; and
2. Global images of tropical cyclone densities derived from these detections, presented as either days per year or storms per year for a 5 x 5 degree longitude/latitude grid.
All tropical cyclones detected using the CSIRO Direct Detection and tracking algorithm within the above domain are presented in space-delimited ASCII text files for each model. Three time periods are available to select:
- from 1981 to 2000 ("baseline" period used for projections);
- from 2081 to 2100 ("future" period used for projections); and
- from 1950 to 2100 (all data).
There are two image types for each coupled model data source, both based on densities of storms within a 5 x 5 lon/lat degree box for the respective 20 year period (either 1981-2000 or 2081-2100):
- images containing "days" in the file name show the number of days per year in which a tropical cyclone was detected within that box
- images with "number" in the file name display the number of separate storms per year detected within that box.less