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GPM Integrated Multi-Satellite Retrievals for GPM (IMERG) Algorithm Theoretical Basis Document (ATBD) v06

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Published Date: 
03/13/2019

This document describes the algorithm and processing sequence for the Integrated Multi-satellitE Retrievals for GPM (IMERG). This algorithm is intended to intercalibrate, merge, and interpolate “all” satellite microwave precipitation estimates, together with microwave-calibrated infrared (IR) satellite estimates, precipitation gauge analyses, and potentially other precipitation estimators at

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TRMM era IMERG Completed & End of FTP at PPS

IMERG is now available back to June 2000 of the TRMM era.  Both the 'early'
and the 'late' products have been retrospectively processed.  These products are available in the same location on the jsimpson.pps.eosdis.nasa.gov FTP server as the current GPM IMERG products: /NRTPUB/imerg/early/YYYYMM and /NRTPUB/imerg/late/YYYYMM.

We are in the process of retrospectively processing the GIS-friendly versions and accumulations of these IMERG products. This is likely to be completed by the end of September 2019.

IMERG Measures Flooding Rainfall in India

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IMERG Measures Flooding Rainfall in India

IMERG Measures Flooding Rainfall in India

In early August 2019 a depression formed in the Bay of Bengal that moved over India contributing to heavy rainfall on India's west coast.  NASA's satellite data analysis suggests that from August 5 though 11, two feet of rain fell in some places. This estimate is from the GPM-based realtime multi-satellite algorithm called IMERG, which is run at NASA Goddard.

IMERG V06B GPM Retrospective Processing Completed

PPS has completed the retrospective processing of IMERG NRT early and late products to version V06B.

All GPM NRT IMERG is available at version V06B from June 2014 through the current IMERG data.

The GPM NRT IMERG from March 2014 through May 2014 will be available once the TRMM era (2000-2014) retrospective processing is completed.

THe V06B data is the default product (early and late) available on the jsimpson.pps.eosdis.nasa.gov NRT file server.

Please contact us for any questions.

 

Observing the ITCZ with IMERG

Observing the Intertropical Convergence Zone with IMERG

The intertropical convergence zone or “ITCZ” roughly forms a band that circumnavigates the Earth near the Equator where the northeast trade winds in the Northern Hemisphere converge with the southeast trade winds in the Southern Hemisphere.  Sailors have often referred to it as the “doldrums” due to its generally light winds.  Yet, the ITCZ is an important part of the global circulation as it forms the ascending branch of the Hadley circulation.  This is ultimately driven by incoming solar radiation, which peaks near the Equator.

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