Imaging · collection · 2011

TRMM Precipitation Radar Power and Reflectivity L1C 1.5 hours V7 (TRMM_1C21)

Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/ym5tcje38xq4

The TRMM Precipitation Radar (PR), the first of its kind in space, is an electronically scanning radar, operating at 13.8 GHz that measures the 3-D rainfall distribution over both land and ocean, and defines the layer depth of the precipitation.

Description

The 1C21 calculates the effective radar reflectivity factor at 13.8 GHz without any propagation loss (due to rain or any other atmospheric gas) correction (Zm). Therefore, the Zm value can be calculated just by applying a radar equation for volume scatter with PR system parameters.

The noise-equivalent Zm is about 21 dBZ. Through the subtraction of the system noise, the Zm value as small as 16 or 18 dBZ are still usable although the data quality is marginal. In 1C21, all echoes stored in 1B21 are converted to "dBZ" unit.

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This is not relevant for "non-rain" echo; however, this policy is adopted so that the 1B21 and 1C21 product format should be as close as possible except for the following points: - Radar quantity is Zm in dBZ unit instead of received power (dBm). - Data at echo-free range bins judged in 1B21 are replaced with a dummy value. Changes in horizontal resolution resulting from the TRMM boost that occurred on 24 August 2001: Pre-Boost (before 7 August 2001): Temporal Resolution: 91.5 min/orbit ~ 16 orbits/day; Swath Width: 215 km; Horizontal Resolution: 4.3 km Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 247 km; Horizontal Resolution: 5.0 km

Topics

Stated by source: Radar Backscatter · Radar Reflectivity · TRMM Precipitation Radar · Tropical Rainfall Measuring Mission
From keywords: Astronomy & Astrophysics · Earth & Environmental Science · Engineering · Ocean & Atmospheric Science · Physics

Provenance · 2 source records, 19 field assertions

Source	Key	Last seen	Raw
NASA Earthdata CMR	C1282110521-GES_DISC	14 d ago	JSON v1
NASA Data Portal	be6ef79c-e909-4b5b-8bb5-78d98ac90f74	11 d ago	JSON v1

Field	Assertion	Extractor	Evidence
access_level	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[field].local:field:astronomy	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:earth-environmental	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:engineering	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:ocean-atmospheric	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:physics	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[instrument].gcmd_instrument:pr	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/spectral-engineering/radar/radar-backscatter	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/spectral-engineering/radar/radar-reflectivity	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[platform].gcmd_platform:trmm	source · NASA CMR	connector:nasa_cmr@1.0.0
created_date	source · NASA CMR	connector:nasa_cmr@1.0.0
description	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/Abstract
license_text	source · NASA CMR	connector:nasa_cmr@1.0.0
publication_date	source · NASA CMR	connector:nasa_cmr@1.0.0
spatial	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/SpatialExtent
temporal	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/TemporalExtents
title	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/EntryTitle
updated_date	source · NASA CMR	connector:nasa_cmr@1.0.0
version_label	source · NASA CMR	connector:nasa_cmr@1.0.0

TRMM Precipitation Radar Power and Reflectivity L1C 1.5 hours V7 (TRMM_1C21)

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