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Description

Version 07 is the current version of the data set. Older versions will no longer be available and have been superseded by Version 07.
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This is environmental data that includes the profiles of atmospheric parameters assumed in the L2 retrieval algorithm.

The 2AKa algorithm provides precipitation estimates from the Ka radar of the Dual-Frequency Precipitation Radar on the core GPM spacecraft. The product contains two swaths of data corresponding to the scans of the Ka radar.

The first swath contains matched scans (MS), which are intended to be co-aligned with the Ku-band instantaneous fields of view (IFOV). The second swath contains the high-sensitivity scans (HS), which are interleaved between the Ku/Ka-MS swaths. Both swaths are narrow and centered within the interior of the Ku swath.

This is a single-frequency retrieval of precipitation; no information from the Ku radar is used. The retrievals are performed at each radar range bin along the slant path of the radar IFOV for each swath. This is a single-frequency retrieval that relies on Ka-band data only. While the 2ADPR dual-frequency retrieval should give better overall estimates, that algorithm requires co-aligned Ku-band data. This 2AKa product will be produced independently and would not be impacted by any operational issues with the Ku-band radar. The high sensitivity to smaller hydrometeors should result in precipitation estimates in lighter precipitation than the Ku-only data.

Product Summary

Platforms
GPM
Instruments
DPR
Spatial Extent

N: 70 S: -70 E: 180 W: -180

Geographic Region
TROPICS
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
2014-03-08 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C2179301732-GES_DISC
Data State
ACTIVE
Number of Files/Granules
66164
Processing Level
2
Published
Updated
Science Keywords
Atmospheric Water Vapor ,
Precipitation

Data Center Citation

GPM Science Team. 2021. GPM DPR Ka Environment L2A 1.5 hours 5 km V07. Greenbelt, MD, USA: NASA Goddard Earth Science Data and Information Services Center (GES DISC). https://disc.gsfc.nasa.gov/datacollection/GPM_2AKaENV_07.html.

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
FS/Latitude FS/Latitude degrees float32 -9999.900390625 N/A N/A
FS/Longitude FS/Longitude degrees float32 -9999.900390625 N/A N/A
FS/ScanTime/DayOfMonth FS/ScanTime/DayOfMonth days int8 -99 N/A N/A
FS/ScanTime/DayOfYear FS/ScanTime/DayOfYear days int16 -9999 N/A N/A
FS/ScanTime/Hour FS/ScanTime/Hour hours int8 -99 N/A N/A
FS/ScanTime/MilliSecond FS/ScanTime/MilliSecond ms int16 -9999 N/A N/A
FS/ScanTime/Minute FS/ScanTime/Minute minutes int8 -99 N/A N/A
FS/ScanTime/Month FS/ScanTime/Month months int8 -99 N/A N/A
FS/ScanTime/Second FS/ScanTime/Second s int8 -99 N/A N/A
FS/ScanTime/SecondOfDay FS/ScanTime/SecondOfDay s float64 -9999.9 N/A N/A
FS/ScanTime/Year FS/ScanTime/Year years int16 -9999 N/A N/A
FS/VERENV/airPressure FS/VERENV/airPressure hPa float32 -9999.900390625 N/A N/A
FS/VERENV/cloudLiquidWater FS/VERENV/cloudLiquidWater kg/m^3 float32 -9999.900390625 N/A N/A
FS/VERENV/skinTemperature FS/VERENV/skinTemperature K float32 -9999.900390625 N/A N/A
FS/VERENV/surfacePressure FS/VERENV/surfacePressure hPa float32 -9999.900390625 N/A N/A
FS/VERENV/surfaceTemperature FS/VERENV/surfaceTemperature K float32 -9999.900390625 N/A N/A
FS/VERENV/surfaceWind FS/VERENV/surfaceWind m/s float32 -9999.900390625 N/A N/A
FS/VERENV/waterVapor FS/VERENV/waterVapor kg/m^3 float32 -9999.900390625 N/A N/A
HS/Latitude HS/Latitude degrees float32 -9999.900390625 N/A N/A
HS/Longitude HS/Longitude degrees float32 -9999.900390625 N/A N/A
HS/ScanTime/DayOfMonth HS/ScanTime/DayOfMonth days int8 -99 N/A N/A
HS/ScanTime/DayOfYear HS/ScanTime/DayOfYear days int16 -9999 N/A N/A
HS/ScanTime/Hour HS/ScanTime/Hour hours int8 -99 N/A N/A
HS/ScanTime/MilliSecond HS/ScanTime/MilliSecond ms int16 -9999 N/A N/A
HS/ScanTime/Minute HS/ScanTime/Minute minutes int8 -99 N/A N/A
HS/ScanTime/Month HS/ScanTime/Month months int8 -99 N/A N/A
HS/ScanTime/Second HS/ScanTime/Second s int8 -99 N/A N/A
HS/ScanTime/SecondOfDay HS/ScanTime/SecondOfDay s float64 -9999.9 N/A N/A
HS/ScanTime/Year HS/ScanTime/Year years int16 -9999 N/A N/A
HS/VERENV/airPressure HS/VERENV/airPressure hPa float32 -9999.900390625 N/A N/A
HS/VERENV/cloudLiquidWater HS/VERENV/cloudLiquidWater kg/m^3 float32 -9999.900390625 N/A N/A
HS/VERENV/skinTemperature HS/VERENV/skinTemperature K float32 -9999.900390625 N/A N/A
HS/VERENV/surfacePressure HS/VERENV/surfacePressure hPa float32 -9999.900390625 N/A N/A
HS/VERENV/surfaceTemperature HS/VERENV/surfaceTemperature K float32 -9999.900390625 N/A N/A
HS/VERENV/surfaceWind HS/VERENV/surfaceWind m/s float32 -9999.900390625 N/A N/A
HS/VERENV/waterVapor HS/VERENV/waterVapor kg/m^3 float32 -9999.900390625 N/A N/A
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