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Description

GDS2 Version -The Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) is a well calibrated passive microwave radiometer, similar to the Special Sensor Microwave Imager (SSM/I), that contains lower frequency channels required for sea surface temperature (SST) retrievals. The TRMM is part of the NASA's mission to planet Earth, and is a joint venture between NASA and the Japan Aerospace Exploration Agency (JAXA) to measure precipitation, water vapor, SST and wind in the global tropical regions and was launched in 27 November 1997 from the Tanegashima Space Center in Tanegashima, Japan. The TRMM satellite travels west to east in a 402 km altitude semi-equatorial precessing orbit that results in day-to-day changes in the observation time of any given earth location between 38S and 38N. Remote Sensing Systems has produced a Version-4 TMI ocean SST dataset for the Group for High Resolution Sea Surface Temperature (GHRSST) by applying an algorithm to the 10.7 GHz channel through a removal of surface roughness effects. In contrast to infrared SST observations, microwave retrievals can be measured through clouds, which are nearly transparent at 10.7 GHz. Microwave retrievals are also insensitive to water vapor and aerosols. The algorithm for retrieving SSTs from radiometer data is described in "AMSR Ocean Algorithm."

Product Summary

Platforms
TRMM
Instruments
TMI
Spatial Extent

N: 39.01 S: -39.06 E: 180 W: -179.99

Spatial Resolution
25000 Meters x 25000 Meters
Location
TROPICS
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
1998-01-01 to 2015-01-11
Data Partner
Remote Sensing Systems (RSS) ,
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2036879048-POCLOUD
Data State
COMPLETE
Number of Files/Granules
96416
Processing Level
2P
Published
Updated
Science Keywords
Sea Surface Temperature

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Remote Sensing Systems. (2014). GHRSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHTMI-2PR04 Date Accessed: 2026-04-20

Documents

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
cloud_liquid_water non L2P core field kg m-2 byte -128 -127 to 127 0.01 1.22
cool_skin non L2P core field K byte -128 -127 to 127 0.01 -1
diurnal_amplitude non L2P core field K byte -128 -127 to 127 0.02 1
dt_analysis none K byte -128 -127 to 127 0.1 N/A
l2p_flags These flags are important to properly use the data N/A short N/A 0 to 2047 1 N/A
lat Latitude of retrievals degrees_north float -32768 -38.59 to 38.52 1 N/A
lon Longitude of retrievals degrees_east float -32768 -179.99 to 180 1 N/A
quality_level These are the overall quality indicators and are used for all GHRSST SSTs N/A byte -128 0 to 5 1 N/A
rain_rate non L2P core field mm hr-1 byte -128 -127 to 127 0.1 12.7
sea_surface_temperature none K short -32768 -5000 to 5000 0.01 273.15
sses_bias none K byte -128 -127 to 127 0.01 N/A
sses_standard_deviation none K byte -128 -127 to 127 0.01 0.75
sst_dtime none second short -32768 0 to 10000 1 N/A
time none seconds since 1981-01-01 00:00:00 int N/A N/A 1 N/A
water_vapor non L2P core field kg m-2 byte -128 -127 to 127 0.3 38.1
wind_speed wind_speed_lf m s-1 byte -128 -127 to 127 0.2 25.4
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