GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree

Description

The Integrated Multi-satellitE Retrievals for GPM (IMERG) algorithm combines information from the GPM satellites to estimate global precipitation. IMERG is the continuation of TRMM. The latest version is the minor version 06B which combines the precipitation estimates collected by the TRMM satellite (2000 - 2015) with the estimates from the GPM satellite (2014 - present).

The monthly Global Precipitation Climatology Project (GPCP) Satellite-Gauge (SG) product over high-latitude ocean and tropical land is used to correct known biases.

The dataset has a spatial resolution of 0.1°x0.1° (roughly 10x10 km) over the globe and a temporal resolution of 30 minutes. The temporal coverage starts on 2000-06-01 to  present with about 3 months of delay.

The IMERG system is run twice in near-real time:

• "Early" multi-satellite product ~4 hr after observation time using only forward morphing and
• "Late" multi-satellite product ~14 hr after observation time, using both forward and backward morphing and once after the monthly gauge analysis is received:
• "Final", satellite-gauge product ~3.5 months after the observation month, using both forward and backward morphing and including monthly gauge analyses.

For this collection only download the "final" product is downloaded.

More information and a detailed description of the algorithm and data sources used are available on the NASA GPM website and on the GES DISC website.

The data is downloaded from the GESC DISC hyrax server using the opendap protocol to get it in netcdf4 format instead of the original HDF5. As each original file contains only 1 timestep for ease of use the files are then concatenated in daily files.

Updates are run with a monthly frequency via the accessdev Jenkins server.

References

• GLOBAL PRECIPITATION MEASUREMENT PRECIPITATION PROCESSING SYSTEM, File Specification. 2020.  URL: ftp://gpmweb2.pps.eosdis.nasa.gov/pub/GPMfilespec/filespec.GPM.pdf
• Jin, Daeho, Oreopoulos, Lazaros, Lee, Dongmin, Tan, Jackson, Cho, Nayeong. 2021.  Cloud-Precipitation Hybrid Regimes and their Projection onto IMERG Precipitation Data. Vol. -1, No. aop, DOI: 10.1175/JAMC-D-20-0253.1  ISSN: 1558-8424, 1558-8432

Local host (English)

Available at NCI as part of the Australian Community Reference Climate Data Collection at:

• /g/data/ia39/aus-ref-clim-data-nci/gpm/data/V06B/<yr>/<files>

To join project:

• https://my.nci.org.au/mancini/login?next=/mancini/project/ia39

Can also be accessed via the collection intake catalogue:

•  https://github.com/aus-ref-clim-data-nci/acs-replica-intake

Access information (English)

Preferred citation:

Huffman, G.J., E.F. Stocker, D.T. Bolvin, E.J. Nelkin, Jackson Tan (2019), GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V06, Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center (GES DISC), Accessed: [Data Access Date], 10.5067/GPM/IMERG/3B-HH/06

Additional details