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NOAA Climate Data Record (CDR) of GPS RO-Calibrated AMSU Channel 7 (Temperatures of Troposphere / Stratosphere, TTS), Version 1.0

Summary

Type of release
ongoing release of a series of related datasets

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
27 September 2015
Modified Date
7 October 2015
Update Frequency
quarterly
Publishers
National Oceanic and Atmospheric Administration, Department of Commerce
Identifier
noaa-climate-data-record-cdr-of-gps-ro-calibrated-amsu-channel-7-temperatures-of-troposphere-s
Landing Page
http://catalog.data.gov/dataset/noaa-climate-data-record-cdr-of-gps-ro-calibrated-amsu-channel-7-temperatures-of-troposphere-s
Temporal Coverage
1 May 2001

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Description

The Climate Data Records (CDR) for Channel 7 contains Radio Occulation (RO) calibrated brightness temperatures from AMSU-A channel 7 measurements at 54.9 GHz from 2001 through present on a 2.5 degree grid. Data are partitioned into yearly files with monthly variables, where each file contains RO-calibrated channel 7 brightness temperatures from AMSU-A measurements from NOAA-15, 16, 17, 18, 19, NASA AQUA and Metop-A. The dataset uses version 2010.2640 of the RO mission data from the UCAR COSMIC Data Analysis and Archival Center (CDAAC), the NOAA archive of the Level 1b AMSU dataset, and the NASA DAAC archive of the Aqua Level 1B dataset. The RO satellites measure the bending angle of GPS signals as they pass through the atmosphere. Temperature profiles are derived from these GPS bending angles from the COSMIC and CHAMP data from 2001 through present. Calibration coefficients are calculated from coincident measurements of AMSU channel 7 brightness temperatures and corresponding values derived from an AMSU forward model applied to temperature profile measurements from RO identified radiosondes. The monthly calibration coefficients are applied to adjust the AMSU Temperature Troposphere Stratosphere (TTS) measurements for each polar orbiter to the temperature profiles from the RO identified Radiosonde Observations (RAOBs). The calibrated AMSU measurements are then combined into gridded monthly values. From these the climatology is calculated using 12 years of data. Anomaly values are then obtained by subtracting this climatology from the monthly values.

Informazioni generali

Informazioni legali

This dataset has been created by US Government which means it is required to be in the public domain. However US copyright law only allows open access by US citizens, we have assumed the data is equivalently licensed as CC0 for the rest of the world as this is in the spirit of the US Government’s Open Data policy.

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